Drill bit drilling number control system and control method thereof

Abstract

The invention discloses a drill bit drilling number control system and a control method thereof, and relates to the technical field of drill bit control, and the control method comprises the following steps: obtaining a drilling load variation, a rotation resistance variation and a drilling tool axial motion variation in a drilling process, and identifying a contact establishment process between drill bit cutter teeth and a hole bottom rock stratum according to a change relation of the three variations; and when the drilling load is increased relative to the stable drilling state within the preset time interval, the rotation resistance is synchronously increased, and meanwhile, the axial advancing speed of the drilling tool is reduced, it is determined that drill bit cutter teeth and a rock stratum form rock breaking contact, and the rock breaking contact is determined as a rock breaking behavior unit. According to the method, rock breaking contact, repeated rock breaking behaviors, local impact rock breaking behaviors and composite rock breaking behaviors are recognized in the drilling process, differential accumulation is conducted on the drill number of the drill bit according to different types of rock breaking behavior units, and the drill number characterization result can be closer to the stress and abrasion process of the drill bit under the actual working condition.

Description

Technical Field

[0001] This invention relates to the field of drill bit control technology, specifically to a drill bit drill count control system and its control method. Background Technology

[0002] In existing drilling operations, the usage status of drill bits is usually managed through the number of boreholes drilled, drilling time, cumulative footage, or experience lifespan. This type of management can meet basic usage requirements under normal working conditions and is simple to implement and easy to deploy. As the automation level of drilling equipment increases, drill bit status monitoring and lifespan management are gradually becoming important technical aspects for improving construction efficiency and ensuring construction continuity. Therefore, controlling the number of times drill bits are used or their lifespan has become a direction of continuous attention in this field. In actual drilling, the interaction between the drill bit and the rock formation is not always in a stable contact state. Especially in deep hole drilling, long drill pipe drilling, or complex rock formation conditions, the drilling system is easily affected by drilling load, rotational resistance, and changes in drill bit attitude, resulting in various rock-breaking behaviors such as contact establishment, contact disengagement, re-contact, local impact, and subsequent slip cutting. Different rock-breaking behaviors contribute differently to drill bit wear, and their distribution in the circumferential position of the drill bit may also exhibit uneven characteristics. Therefore, characterizing the drill bit's usage state solely based on a single drilling count or a single time parameter is insufficient to fully reflect the true stress and wear conditions of the drill bit during actual drilling. Based on this, existing drilling control technologies require further refinement of drill bit usage status identification methods. Specifically, during drilling, different rock-breaking behaviors should be distinguished by combining changes in drilling load, rotational resistance, drill string axial movement, and drill bit circumferential position distribution. Based on this, a more accurate cumulative drill bit count result should be generated, closely reflecting the actual rock-breaking process. Furthermore, if the corrected drill bit count corresponding to different types of rock-breaking behaviors can be used for drill bit working status judgment and drilling parameter adjustment, it will help improve the precision of drill bit usage management and enhance the stability and controllability of the drilling process. Therefore, this invention proposes a drill bit count control system and its control method. Summary of the Invention

[0003] The purpose of this invention is to provide a drill bit drill count control system and its control method to solve the problems mentioned in the background art.

[0004] This invention can be achieved through the following technical solution: a drill bit drill count control method, comprising: Step 1: During the drilling process, obtain the changes in drilling load, rotational resistance, and axial motion of the drill bit. Based on the relationship between these three changes, identify the contact establishment process between the drill bit teeth and the rock strata at the bottom of the hole. When the drilling load increases relative to the stable drilling state within a preset time interval and the rotational resistance increases synchronously, while the axial advance speed of the drill bit decreases, it is determined that the drill bit teeth and the rock strata form a rock-breaking contact, and the rock-breaking contact is identified as the rock-breaking behavior unit. Step 2: After identifying the rock-breaking behavior unit, continue to identify the contact changes between the drill bit and the rock formation. When the drill bit makes contact, detaches and then makes contact with the rock formation again during continuous drilling, the process of re-establishing contact is identified as a new rock-breaking behavior unit in order to identify repeated rock-breaking behavior caused by drill vibration. Step 3: Determine the distribution of each rock-breaking behavior unit in the circumferential direction of the drill bit based on the rotation angle of the drill bit. When multiple rock-breaking behavior units are distributed in the same circumferential section during continuous rotation, it is determined that the drill bit is in an eccentric rotation state, and the rock-breaking behavior unit generated in that circumferential section is identified as a local impact rock-breaking behavior unit. Step 4: After identifying the local impact rock-breaking behavior unit, when the drilling load decreases after the impact contact ends and the rotational resistance remains higher than the rotational resistance level corresponding to the stable rock-breaking stage, it is determined that slip cutting has occurred between the drill bit and the rock strata, and the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit. Step 5: Accumulate the drill bit count based on different types of rock-breaking behavior units. Rock-breaking behavior units formed by stable contact are counted as the basic drill count, repeated rock-breaking behavior units are counted as the superimposed drill count, and local impact rock-breaking behavior units and composite rock-breaking behavior units are counted as the enhanced drill count, thus obtaining the corrected drill count.

[0005] A further technical improvement of the present invention is that the identification of rock-breaking contact in step one includes the following steps: During continuous drilling, a dynamic reference section is constructed based on the drilling section that was in a stable drilling state before the current drilling moment, and the drilling load reference level, rotational resistance reference level, and drill string axial advance speed reference level are determined within the dynamic reference section. A contact determination window is established after the dynamic reference section, and the changes in drilling load, rotational resistance, and axial advance speed of the drill string are obtained within the contact determination window. When the changes in drilling load, rotational resistance, and axial advance speed of the drill bit simultaneously meet the rock-breaking contact determination conditions within the same contact determination window, it is determined that the drill bit teeth and the rock strata form rock-breaking contact and form a rock-breaking behavior unit. During continuous drilling, the dynamic reference section is reconstructed according to the preset update cycle, and the drilling load reference level, rotational resistance reference level and drill string axial advance speed reference level are re-determined based on the updated dynamic reference section.

[0006] A further technical improvement of the present invention is that the identification of repeated rock-breaking behavior in step two includes the following steps: After identifying the rock-breaking behavior unit, the change in the drill bit rotation angle is continuously acquired, and the continuously acquired change in rotation angle is recorded in segments according to the preset angle interval to form multiple angle change segments. Within each angle change range, the changes in drilling load and rotational resistance are recorded respectively. The contact state is determined based on the direction of change of drilling load and rotational resistance. When both the changes in drilling load and rotational resistance increase simultaneously, the contact is established. When both the changes in drilling load and rotational resistance decrease simultaneously, the contact is released. The contact state within multiple angle change segments is continuously determined according to the rotation sequence. When the contact establishment state, contact dissolution state, and contact re-establishment state appear sequentially within the continuous angle change segment, a contact state sequence is formed. When the number of angle change segments corresponding to the formed contact state sequence reaches the preset angle segment continuity threshold, and the rotation angle range between the contact establishment state and the re-contact establishment state is not less than the minimum repeated rock breaking angle range, the angle change segment corresponding to the re-contact establishment state is determined as the repeated rock breaking contact segment, and the contact process corresponding to the repeated rock breaking contact segment is determined as a new rock breaking behavior unit. If a contact state sequence that meets the continuity threshold of the angle segment is not formed within the continuous angle change segment, or if the rotation angle range between the contact establishment state and the re-contact establishment state is less than the minimum repeating rock breaking angle range, the corresponding contact process will not be identified as a new rock breaking behavior unit.

[0007] A further technical improvement of the present invention is that the identification of the eccentric rotation and local impact rock-breaking behavior units in step three includes the following steps: During continuous drilling, multiple rotation cycle intervals are divided according to a preset rotation cycle, and within each rotation cycle interval, multiple circumferential angle segments are divided according to a preset circumferential angle interval. Record the rotation angle position, drilling load change and rotation resistance change corresponding to the rock breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value of the corresponding rock breaking behavior unit by multiplying the drilling load change and the rotation resistance change. The rock-breaking behavior units in the same circumferential angle segment within multiple rotation period intervals are mapped to the same circumferential coordinate segment, and the number of rock-breaking behavior units and the unit impact energy value in each circumferential angle segment are accumulated to form the cumulative value of the number of circumferential rock-breaking units and the cumulative value of circumferential impact energy corresponding to each circumferential angle segment. Compare the positions of the circumferential angle segments corresponding to the largest cumulative value of circumferential rock breaking between adjacent rotation cycle intervals. When the angle deviation between the positions of the largest corresponding circumferential angle segments in multiple consecutive rotation cycle intervals is not greater than the preset phase locking angle threshold, the corresponding circumferential angle segment is determined as the phase locking circumferential segment. When the cumulative value of circumferential impact energy in the phase-locked circumferential section is greater than the cumulative value of circumferential impact energy in other circumferential angle sections, and the number of rock-breaking behavior units in the phase-locked circumferential section reaches a preset threshold, the drill bit is determined to be in an eccentric rotation state, and the rock-breaking behavior units formed in the phase-locked circumferential section are identified as local impact rock-breaking behavior units.

[0008] A further technical improvement of the present invention is that the identification of local impact rock-breaking behavior units in step three includes the following steps: During continuous drilling, the rotation angle position of the drill bit is obtained, and the rotation range of the drill bit is divided into multiple circumferential angle segments according to a preset angle interval; Record the changes in drilling load and rotational resistance corresponding to the rock-breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value by multiplying the changes in drilling load and rotational resistance. The impact energy values ​​of units in the same circumferential angle segment are superimposed and recorded within multiple consecutive rotation cycles to form a circumferential impact energy sequence corresponding to each circumferential angle segment. In the circumferential impact energy sequence, the circumferential angle segment in which the cumulative energy value remains at its maximum for multiple consecutive rotation cycles is identified, and this circumferential angle segment is defined as the circumferential impact density stable segment. When the number of rock-breaking behavior units in the circumferential impact density stable zone reaches a preset threshold, and all rock-breaking behavior units are located in the circumferential impact density stable zone, the rock-breaking behavior unit is determined as a local impact rock-breaking behavior unit.

[0009] A further technical improvement of the present invention is that the identification of the composite rock-breaking behavior unit in step four includes the following steps: After identifying the local impact rock-breaking behavior unit, the drilling load change and rotation resistance change corresponding to the local impact rock-breaking behavior unit are recorded, and the product of the drilling load change and rotation resistance change is determined as the impact energy value. After the impact contact ends, the continuous rotation angle section is divided into multiple energy tracking sections according to a preset angle interval. The changes in drilling load and rotation resistance are recorded in each energy tracking section. The product of the changes in drilling load and rotation resistance in each energy tracking section is determined as the sliding cutting energy value. An energy evolution sequence is constructed by matching the impact energy value with the slip cutting energy value corresponding to each energy tracking segment according to the rotation order; When the energy evolution sequence satisfies the condition that the impact energy value reaches a local peak, and the corresponding impact energy value in subsequent consecutive energy tracking segments shows a decreasing trend relative to the impact energy peak, and the sliding cutting energy value shows an increasing trend in consecutive energy tracking segments, the sliding cutting process after the end of the impact contact is defined as the impact sliding energy transfer stage. When the energy transfer phase of impact slip forms a continuous energy transfer trajectory within the same circumferential angle segment, and this energy transfer trajectory repeats in multiple consecutive rotation cycles, the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit.

[0010] A further technical improvement of the present invention is as follows: after identifying the rock-breaking behavior unit formed by stable contact, the repeated rock-breaking behavior unit, the local impact rock-breaking behavior unit, and the composite rock-breaking behavior unit, the drilling load change, the rotation resistance change, and the continuous rotation angle range corresponding to each type of rock-breaking behavior unit are obtained respectively, and the product of the drilling load change and the rotation resistance change is determined as the rock-breaking action value. The rock-breaking action values ​​corresponding to various rock-breaking behavior units are weighted according to the preset rock-breaking contribution coefficient to determine the rock-breaking contribution of each rock-breaking behavior unit. The rock-breaking contribution is mapped to the circumferential angle section of the drill bit according to the rotation angle position, and the cumulative value of the rock-breaking contribution corresponding to each circumferential angle section is accumulated in multiple consecutive rotation cycles to form the circumferential wear contribution distribution; then, according to the pre-calibrated conversion relationship between the cumulative value of rock-breaking contribution and the equivalent drill value, the cumulative value of rock-breaking contribution corresponding to each circumferential angle section is converted into the equivalent drill value respectively. Finally, the equivalent drill bit values ​​obtained by converting the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units in each circumferential angle segment are summed to obtain the corrected drill bit number.

[0011] A further technical improvement of the present invention is that the application of correcting the drill number in step five includes the following steps: After obtaining the corrected drill bit count, the growth rate of the corrected drill bit count is calculated based on the change in the corrected drill bit count within multiple consecutive drilling sampling intervals. The corrected drill bit count is then compared with the preset drill bit life interval to determine the current working state of the drill bit. When the corrected drill number is within the preset normal use range and the corrected drill number growth rate is not greater than the preset growth rate threshold, maintain the current drilling load, rotation speed and drill string axial advance speed. When the corrected drill number is in the preset accelerated wear range or the corrected drill number growth rate is greater than the preset growth rate threshold, the drilling load is reduced and the axial advance speed of the drill string is reduced according to the preset adjustment range, while the drill bit rotation speed is reduced. When the corrected drill number enters the preset failure critical range, a drill bit replacement command is generated and further increases in drilling load and rotation speed are limited. When the corrected drill number enters the preset failure critical range and the corrected drill number growth rate exceeds the preset abnormal growth threshold for multiple consecutive drilling sampling intervals, a protection shutdown command is generated to terminate the current drilling process.

[0012] On the other hand, the present invention also discloses a drill bit count control system, which adopts the control method described in any one of the above.

[0013] Compared with the prior art, the present invention has the following beneficial effects: This invention identifies rock-breaking contact, repeated rock-breaking behavior, local impact rock-breaking behavior, and combined rock-breaking behavior during the drilling process, and differentially accumulates the drill bit count based on different types of rock-breaking behavior units. This enables the drill bit count representation results to more closely reflect the stress and wear process of the drill bit under actual working conditions. Compared with management methods based solely on the number of boreholes, drilling time, or cumulative footage, the corrected drill bit count generated by this invention can more accurately reflect the true rock-breaking contribution of the drill bit during continuous drilling, thereby improving the accuracy of the drill bit usage status representation. Furthermore, this invention combines the drill bit's rotation angle position, circumferential segment distribution, and energy accumulation characteristics over multiple rotation cycles to identify eccentric rotation states, local impact rock-breaking behavior, and composite rock-breaking behavior. This enables the effective differentiation of localized stress concentration phenomena in complex drilling conditions. In this way, not only can the non-uniform rock-breaking characteristics of the drill bit in the axial and circumferential directions be identified, but the rock-breaking behavior can also be correlated with the circumferential wear contribution distribution, which is beneficial to improving the ability to identify abnormal drill bit wear, localized high-load rock-breaking, and failure risks. On the other hand, the present invention can also apply the corrected drill number to the judgment of the drill bit working status and the adjustment of drilling parameters. When the corrected drill number or its growth rate reaches the corresponding conditions, the drilling load, rotation speed and axial advance speed of the drill string can be adjusted, or drill bit replacement instructions and protection shutdown instructions can be generated. Thus, the present invention not only realizes the fine control of the drill bit number, but also enhances the continuity, stability and safety of the drilling process, and plays a positive role in improving drilling efficiency, optimizing drill bit use and management and reducing the risk of abnormal wear. Attached Figure Description

[0014] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to the accompanying drawings.

[0015] Figure 1 This is a schematic diagram of the method flow for controlling the number of drill bits in this invention. Detailed Implementation

[0016] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with the accompanying drawings and preferred embodiments, is provided.

[0017] Please see Figure 1 As shown, the present invention provides a method for controlling the number of drill bits, comprising: Step 1: During drilling, acquire data on changes in drilling load, rotational resistance, and drill string axial motion. Identify the contact establishment process between the drill bit and the rock formation at the bottom of the hole based on the relationship between these three changes. When the drilling load increases relative to a stable drilling state within a preset time interval, and the rotational resistance increases simultaneously, while the drill string axial advance speed decreases, it is determined that the drill bit has formed rock-breaking contact with the rock formation, and this rock-breaking contact is defined as the rock-breaking behavior unit. This establishes the fundamental criteria for determining whether actual rock-breaking action has occurred between the drill bit and the rock formation, ensuring that subsequent drill count calculations are not based solely on drilling time, number of boreholes, or machine operation status, but rather on the actual physical process of the interaction between the drill bit and the rock formation. By simultaneously acquiring changes in drilling load, rotational resistance, and drill string axial motion, it is possible to distinguish between states such as drill bit idling, slight rubbing, and ineffective contact with actual rock-breaking contact, thereby avoiding the incorrect inclusion of processes that do not constitute effective rock-breaking in the drill bit count. Furthermore, defining rock-breaking contact as the rock-breaking behavior unit is equivalent to establishing a unified minimum identification object for subsequent identification of repeated rock-breaking behavior, local impact rock-breaking behavior, composite rock-breaking behavior, and correction of drill number calculation.

[0018] In this embodiment, a rock-breaking behavior unit is defined as a continuous contact process from the start time when the drill bit teeth and the rock stratum meet the rock-breaking contact determination conditions to the end time when the contact maintenance conditions are no longer met. The contact maintenance conditions are: during continuous sampling, the change in drilling load remains greater than zero, the change in rotational resistance remains greater than zero, and the change in the axial advance speed of the drill string remains less than zero. When any parameter in two consecutive sampling times no longer meets the aforementioned sign direction conditions, the first time that the condition is not met is determined as the end time of the rock-breaking behavior unit. The start time, end time, duration, and continuous rotation angle range of the continuous contact process together constitute a rock-breaking behavior unit. The new rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units involved in subsequent steps are all different types of rock-breaking behavior units formed based on the above definition.

[0019] Identification of rock-breaking contact includes the following steps: During continuous drilling, a dynamic reference section is constructed based on the drilling section that was in a stable drilling state before the current drilling moment, and the drilling load reference level, rotational resistance reference level, and drill string axial advance speed reference level are determined within the dynamic reference section. A contact determination window is established after the dynamic reference section, and the changes in drilling load, rotational resistance, and axial advance speed of the drill string are obtained within the contact determination window. When the changes in drilling load, rotational resistance, and axial advance speed of the drill bit simultaneously meet the rock-breaking contact determination conditions within the same contact determination window, it is determined that the drill bit teeth and the rock strata form rock-breaking contact and form a rock-breaking behavior unit. During continuous drilling, the dynamic reference section is reconstructed according to the preset update cycle, and the drilling load reference level, rotational resistance reference level and drill string axial advance speed reference level are re-determined based on the updated dynamic reference section.

[0020] Specifically, in this embodiment, a load acquisition component, a rotational resistance acquisition component, and an axial displacement acquisition component are respectively installed on the drilling device to continuously acquire changes in drilling load, rotational resistance, and drill string axial movement. The load acquisition component is installed at the propulsion actuator to measure the real-time force value in the drilling direction; the rotational resistance acquisition component is installed at the drive rotation component to measure the real-time resistance value during drill bit rotation; and the axial displacement acquisition component is installed at the propulsion guide component to measure the displacement and velocity changes of the drill string along the drilling direction. In this embodiment, the sampling period is set to 0.02s, i.e., 50 sets of data are collected per second. To identify a stable drilling state, a continuous 8-second drilling segment is used as the discrimination segment. When the maximum fluctuation of the drilling load within this segment does not exceed 5% of the average load value, the maximum fluctuation of the rotational resistance does not exceed 5% of the average resistance value, and the maximum fluctuation of the drill string axial propulsion speed does not exceed 3% of the average propulsion speed, this continuous 8-second drilling segment is determined as the drilling segment corresponding to the stable drilling state. A dynamic reference section is constructed based on the most recent drilling section that meets the above conditions before the current drilling time. Within this dynamic reference section, the average drilling load, average rotational resistance, and average drill string axial advance speed are calculated respectively to determine the reference levels for drilling load, rotational resistance, and drill string axial advance speed. For example, in a certain implementation scenario, the reference level for drilling load measured within the dynamic reference section is 12.0 kN, the reference level for rotational resistance is 180 N·m, and the reference level for drill string axial advance speed is 3.2 mm / s.

[0021] After obtaining the dynamic reference section and corresponding benchmark level, a contact determination window is established after the dynamic reference section. In this embodiment, the contact determination window is set to 0.20s, which is the time length corresponding to 10 consecutive sets of sampling data. Within each contact determination window, the real-time drilling load value, real-time rotational resistance value, and real-time drill string axial advance speed value are obtained and compared with the drilling load benchmark level, rotational resistance benchmark level, and drill string axial advance speed benchmark level, respectively, to obtain the corresponding changes in drilling load, rotational resistance, and drill string axial advance speed. In this embodiment, the preset time interval is consistent with the contact determination window, both being 0.20s. When the average drilling load within 0.20s increases by no less than 12% compared to the average drilling load corresponding to the stable drilling state, and the average rotational resistance increases by no less than 10% compared to the average rotational resistance corresponding to the stable drilling state, while the average drill string axial advance speed decreases by no less than 8% compared to the average advance speed corresponding to the stable drilling state, the three are considered to satisfy a synchronous change relationship. For example, under the aforementioned baseline conditions, if the average drilling load reaches 13.6 kN or higher, the average rotational resistance reaches 198 N·m or higher within a certain contact determination window, and the axial advance speed of the drill bit drops below 2.94 mm / s, then the contact establishment conditions are considered met within that window. This method can distinguish between drill bit idling, slight rubbing, or slag discharge disturbances from the effective contact process of truly cutting into the rock formation.

[0022] When the changes in drilling load, rotational resistance, and drill string axial speed simultaneously meet the rock-breaking contact criteria within the same contact determination window, rock-breaking contact is confirmed between the drill bit teeth and the rock formation. The continuous contact process from the start time when the rock-breaking contact criteria are met to the end time when the contact maintenance criteria are no longer met is defined as a rock-breaking behavior unit. In this embodiment, to avoid misjudgment caused by single, occasional fluctuations, a continuous confirmation method using two adjacent sampling times can be further adopted. That is, rock-breaking contact is only confirmed when at least two sets of continuous sampling data simultaneously meet the aforementioned increase and decrease conditions within the same contact determination window. For example, in a granite drilling condition, if the drilling load is measured to be 13.8 kN, the rotational resistance to be 202 N·m, and the drill string axial speed to be 2.85 mm / s at the first sampling time, and the drilling load is measured to be 14.1 kN, the rotational resistance to be 205 N·m, and the drill string axial speed to be 2.79 mm / s at the second sampling time, then a new rock-breaking behavior unit can be confirmed within this contact determination window. By unifying the identification results onto rock-breaking behavior units with start time, end time, duration, and range of continuous rotation angles, a unified input basis can be provided for subsequent identification of repeated rock-breaking behavior, local impact rock-breaking behavior, composite rock-breaking behavior, and correction of drill number calculation.

[0023] During continuous drilling, to ensure that the judgment criteria for different rock formations, wear conditions, and propulsion conditions can be adaptively updated as the conditions change, this embodiment reconstructs the dynamic reference segment according to a preset update cycle, and redetermines the drilling load reference level, rotational resistance reference level, and drill string axial propulsion speed reference level based on the updated dynamic reference segment. In this embodiment, the preset update cycle is 20 seconds, that is, every 20 seconds, the drilling segment that most recently met the stable drilling condition judgment criteria is traced back 8 seconds, and the reference level is updated accordingly; if there is no drilling segment that meets the stable conditions within the current 20 seconds, the search continues along the time axis to find the most recently met drilling segment as the new dynamic reference segment. For example, as drill bit wear intensifies, the average drilling load may increase from 12.0 kN to 12.8 kN, the average rotational resistance may increase from 180 N·m to 192 N·m, and the average axial advance speed of the drill bit may decrease from 3.2 mm / s to 3.0 mm / s. In this case, by redefining the dynamic reference section, the distortion of rock breaking contact identification caused by continuing to use the old benchmark can be avoided.

[0024] Furthermore, to determine the drilling load increase ratio, rotational resistance increase ratio, and drill string axial advance speed decrease ratio in the rock breaking contact judgment conditions, multiple sets of standard drilling samples completed by the same type of drill bit in the target rock formation were first selected as calibration samples. Drilling load, rotational resistance, and drill string axial advance speed were simultaneously collected in each calibration sample. Based on the drilling video, bottom hole condition detection results, and the corresponding relationship of the cutting tooth wear marks after the drill bit was withdrawn, each sampling time period was labeled as effective rock breaking contact state, idling state, slight rubbing state, and slag discharge disturbance state. Then, the idling state, slight rubbing state, and slag discharge disturbance state were uniformly classified into ineffective rock breaking state.

[0025] Subsequently, the ranges of drilling load increase ratio, rotational resistance increase ratio, and drill string axial advance speed decrease ratio were statistically analyzed under both effective rock-breaking contact state and ineffective rock-breaking state. When the minimum value corresponding to the effective rock-breaking contact state is greater than the maximum value corresponding to the ineffective rock-breaking state, the minimum value corresponding to the effective rock-breaking contact state is used as the corresponding judgment threshold. When the minimum value corresponding to the effective rock-breaking contact state is less than or equal to the maximum value corresponding to the ineffective rock-breaking state, the average value of the minimum value corresponding to the effective rock-breaking contact state and the maximum value corresponding to the ineffective rock-breaking state is used as the corresponding judgment threshold.

[0026] In this embodiment, based on the above sample statistical results, drilling load increase of not less than 12%, rotational resistance increase of not less than 10%, and drill string axial advance speed decrease of not less than 8% are determined as rock-breaking contact judgment conditions. Through the above calibration process, the rock-breaking contact identification threshold has a clear sample source, clear calculation rules, and clear value basis.

[0027] Step Two: After identifying the rock-breaking behavior units, continuously monitor the contact changes between the drill bit and the rock formation. When the drill bit contacts, detaches from, and re-contacts the rock formation during continuous drilling, the process of re-establishing contact is defined as a new rock-breaking behavior unit to identify repeated rock-breaking behavior caused by drill string vibration. Based on the identified initial rock-breaking behavior units, this further reveals that the drill bit is not always in a single, continuous, stable rock-breaking state during actual drilling. It may experience contact, detachment, and re-contact with the rock formation due to drill string vibration, force fluctuations, or changes in the bottom hole conditions. This phenomenon means that the drill bit actually undergoes multiple discrete rock-breaking actions in a seemingly continuous drilling process. If treated as a single rock-breaking behavior, the actual wear of the drill bit will be underestimated. By defining the process of re-establishing contact as a new rock-breaking behavior unit...

[0028] Identifying repetitive rock-breaking behavior includes the following steps: After identifying the rock-breaking behavior unit, the change in the drill bit rotation angle is continuously acquired, and the continuously acquired change in rotation angle is recorded in segments according to the preset angle interval to form multiple angle change segments. Within each angle change range, the changes in drilling load and rotational resistance are recorded respectively. The contact state is determined based on the direction of change of drilling load and rotational resistance. When both the changes in drilling load and rotational resistance increase simultaneously, the contact is established. When both the changes in drilling load and rotational resistance decrease simultaneously, the contact is released. The contact state within multiple angle change segments is continuously determined according to the rotation sequence. When the contact establishment state, contact dissolution state, and contact re-establishment state appear sequentially within the continuous angle change segment, a contact state sequence is formed. When the number of angle change segments corresponding to the formed contact state sequence reaches the preset angle segment continuity threshold, and the rotation angle range between the contact establishment state and the re-contact establishment state is not less than the minimum repeated rock breaking angle range, the angle change segment corresponding to the re-contact establishment state is determined as the repeated rock breaking contact segment, and the contact process corresponding to the repeated rock breaking contact segment is determined as a new rock breaking behavior unit. If a contact state sequence that meets the continuity threshold of the angle segment is not formed within the continuous angle change segment, or if the rotation angle range between the contact establishment state and the re-contact establishment state is less than the minimum repeating rock breaking angle range, the corresponding contact process will not be identified as a new rock breaking behavior unit.

[0029] Specifically, in this embodiment, after identifying the initial rock-breaking behavior unit according to the aforementioned step one, the identification continues to focus on the contact changes between the drill bit and the rock strata. To ensure that subsequent identification is based on continuous drilling conditions, the drill bit rotation angle change is continuously acquired during drilling, and the corresponding drill bit angle position change for each sampling is used as the basis for subsequent segmentation. In this embodiment, the rotation angle sampling period is consistent with the aforementioned embodiment, set to 0.02s, that is, 50 sets of rotation angle data are collected per second; in a certain implementation scenario, the drill bit rotation speed is 120r / min, then the drill bit rotates 720° per second, and the average rotation angle change within each sampling period is approximately 14.4°. To ensure sufficient angular resolution for contact change identification, this embodiment sets the preset angle interval to 15°, and the continuously acquired drill bit rotation angle changes are segmented and recorded according to this angle interval, thereby forming multiple angle change segments. When the drill bit completes a full rotation, 24 angle change segments can be obtained. This approach allows for the discretization of contact changes along the rotation angle during continuous drilling, providing a unified angular reference for subsequent identification of contact establishment, contact dissolution, and re-establishment states.

[0030] After forming multiple angle change segments, the changes in drilling load and rotational resistance are recorded for each segment, and the corresponding contact state is determined based on their directions of change. In this embodiment, the average drilling load and average rotational resistance corresponding to the stable drilling state determined in step one above are used as comparison benchmarks. When the change in average drilling load within a certain angle change segment increases by at least 10% relative to the benchmark value, and the change in average rotational resistance increases by at least 8% relative to the benchmark value, the angle change segment is determined to be in a contact establishment state. When the change in average drilling load within a certain angle change segment decreases by at least 8% relative to the benchmark value, and the change in average rotational resistance decreases by at least 6% relative to the benchmark value, the angle change segment is determined to be in a contact dissolution state. For example, under a certain granite drilling condition, the average drilling load during stable drilling is 12.0 kN and the average rotational resistance is 180 N·m. When the average drilling load is measured to be 13.5 kN and the average rotational resistance is measured to be 196 N·m in a certain angle change section, it can be determined that the section is in a contact establishment state. When the average drilling load is measured to be reduced to 10.8 kN and the average rotational resistance is reduced to 168 N·m in a subsequent angle change section, it can be determined that the section is in a contact dissolution state.

[0031] After obtaining multiple angle change segments and their corresponding contact states, the continuity of the contact states within these segments is determined according to the rotation sequence to identify whether a contact state sequence has been formed. In this embodiment, a complete contact state sequence is determined when a contact establishment state, a contact dissolution state, and a re-establishment state occur sequentially within multiple consecutive angle change segments. To avoid misjudging occasional fluctuations as repeated rock-breaking behavior, this embodiment further sets a preset angle segment continuity threshold and a minimum repeated rock-breaking angle range. The preset angle segment continuity threshold is set to 3 angle change segments, meaning that the number of consecutive segments forming a complete contact state sequence is no less than 3; the minimum repeated rock-breaking angle range is set to 30°, meaning that the rotation angle range between the first occurrence of a contact establishment state and the occurrence of a re-establishment state is no less than 30°. For example, in one embodiment, if the 5th angle change segment is a contact establishment state, the 6th angle change segment is a contact disengagement state, and the 7th angle change segment is a contact establishment state again, a contact state sequence containing 3 angle change segments is formed, corresponding to a rotation angle range of 45°, satisfying the preset angle segment continuity threshold and the minimum repeatable rock-breaking angle range. In this case, the 7th angle change segment is determined as a repeatable rock-breaking contact segment, and the contact process corresponding to this repeatable rock-breaking contact segment is determined as a new rock-breaking behavior unit. Conversely, when only contact establishment and contact disengagement states occur within the continuous angle change segment, without a re-establishment of contact, or although a re-establishment of contact occurs but the corresponding rotation angle range is only 15°, which is lower than the minimum repeatable rock-breaking angle range, then this contact process is not determined as a new rock-breaking behavior unit.

[0032] During continuous drilling, the newly identified rock-breaking behavior units are recorded together with the previously identified initial rock-breaking behavior units, so that multiple discrete contact processes in the same drilling process can be included in the subsequent calculation basis of the drill bit count. In this embodiment, during a complete drilling process, the number of initially identified rock-breaking behavior units is 120. After further analysis of the continuous rotation angle sequence, an additional 18 new rock-breaking behavior units that meet the preset angle segment continuity threshold and the minimum repeating rock-breaking angle range are identified. If step two of this embodiment is not performed, these 18 repeated rock-breaking behaviors caused by drill bit vibration will not be counted separately, thus underestimating the wear of the drill bit during actual drilling. However, this embodiment can further utilize the drill bit rotation angle change, angle change segment, contact state sequence, preset angle segment continuity threshold, and minimum repeated rock-breaking angle range to provide clear data sources, identification boundaries, and judgment conditions.

[0033] Furthermore, to determine the preset angle interval, the preset angle segment continuity threshold, and the minimum repeatable rock-breaking angle range, the rotation angle change sequence, contact state change sequence, and the repeatable distribution result of the circumferential wear marks of the drill bit are extracted from multiple sets of vibration drilling samples that have identified rock-breaking behavior units. Then, samples in which the same cutting tooth position of the drill bit re-enters the effective contact state and the corresponding local wear marks deepen during a complete rotation are labeled as repeatable rock-breaking samples. Samples in which only instantaneous unloading, short-term fluctuations, or no effective re-entry are labeled as non-repeatable rock-breaking samples.

[0034] Subsequently, the angle span range and number of continuous state segments corresponding to the repeated rock-breaking samples and non-repeated rock-breaking samples before the re-contact occurred were counted respectively. When the minimum angle span range corresponding to the repeated rock-breaking sample is greater than the maximum angle span range corresponding to the non-repeated rock-breaking sample, the minimum angle span range corresponding to the repeated rock-breaking sample is taken as the minimum repeated rock-breaking angle range. When the minimum angle span range corresponding to the repeated rock-breaking sample is less than or equal to the maximum angle span range corresponding to the non-repeated rock-breaking sample, the average of the two is taken as the minimum repeated rock-breaking angle range.

[0035] Regarding the number of continuous state segments, when the minimum number of continuous state segments corresponding to repeated rock breaking samples is greater than the maximum number of continuous state segments corresponding to non-repeated rock breaking samples, the minimum number of continuous state segments corresponding to repeated rock breaking samples is used as the preset angle segment continuity threshold; when the minimum number of continuous state segments corresponding to repeated rock breaking samples is less than or equal to the maximum number of continuous state segments corresponding to non-repeated rock breaking samples, the integer value obtained by rounding up the average of the two is used as the preset angle segment continuity threshold.

[0036] In this embodiment, 15° is defined as the preset angle interval, the three angle change segments are defined as the preset angle segment continuity thresholds, and 30° is defined as the minimum repeatable rock-breaking angle range. Through the above process, the parameter boundaries of the repeatable rock-breaking behavior are directly determined by the sample statistical results.

[0037] Step 3: Determine the distribution of each rock-breaking behavior unit in the circumferential direction of the drill bit based on the drill bit's rotation angle. When multiple rock-breaking behavior units are distributed in the same circumferential section during continuous rotation, the drill bit is determined to be in an eccentric rotation state, and the rock-breaking behavior units generated in this circumferential section are identified as local impact rock-breaking behavior units. The rock-breaking behavior units identified in the first two steps are further projected into the circumferential spatial distribution of the drill bit to identify whether there is a circumferential concentration of rock-breaking action. If multiple rock-breaking behavior units are continuously distributed in the same circumferential section during continuous rotation, it indicates that the drill bit is not working uniformly in terms of circumferential force, but rather that a certain local area repeatedly and preferentially contacts the rock layer and bears a higher impact load. This is precisely the specific manifestation of eccentric rotation in the rock-breaking process. By identifying the rock-breaking behavior units generated in this circumferential section as local impact rock-breaking behavior units, general rock-breaking behavior can be clearly distinguished from local high-impact rock-breaking behavior, thus providing a basis for subsequent identification of abnormal wear and enhanced drill number accumulation.

[0038] The identification of eccentric rotation and local impact rock-breaking behavior units includes the following steps: During continuous drilling, multiple rotation cycle intervals are divided according to a preset rotation cycle, and within each rotation cycle interval, multiple circumferential angle segments are divided according to a preset circumferential angle interval. Record the rotation angle position, drilling load change and rotation resistance change corresponding to the rock breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value of the corresponding rock breaking behavior unit by multiplying the drilling load change and the rotation resistance change. The rock-breaking behavior units in the same circumferential angle segment within multiple rotation period intervals are mapped to the same circumferential coordinate segment, and the number of rock-breaking behavior units and the unit impact energy value in each circumferential angle segment are accumulated to form the cumulative value of the number of circumferential rock-breaking units and the cumulative value of circumferential impact energy corresponding to each circumferential angle segment. Compare the positions of the circumferential angle segments corresponding to the largest cumulative value of circumferential rock breaking between adjacent rotation cycle intervals. When the angle deviation between the positions of the largest corresponding circumferential angle segments in multiple consecutive rotation cycle intervals is not greater than the preset phase locking angle threshold, the corresponding circumferential angle segment is determined as the phase locking circumferential segment. When the cumulative value of circumferential impact energy in the phase-locked circumferential section is greater than the cumulative value of circumferential impact energy in other circumferential angle sections, and the number of rock-breaking behavior units in the phase-locked circumferential section reaches a preset threshold, the drill bit is determined to be in an eccentric rotation state, and the rock-breaking behavior units formed in the phase-locked circumferential section are identified as local impact rock-breaking behavior units.

[0039] The identification of localized impact rock-breaking behavior units includes the following steps: During continuous drilling, the rotation angle position of the drill bit is obtained, and the rotation range of the drill bit is divided into multiple circumferential angle segments according to a preset angle interval; Record the changes in drilling load and rotational resistance corresponding to the rock-breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value by multiplying the changes in drilling load and rotational resistance. The impact energy values ​​of units in the same circumferential angle segment are superimposed and recorded within multiple consecutive rotation cycles to form a circumferential impact energy sequence corresponding to each circumferential angle segment. In the circumferential impact energy sequence, the circumferential angle segment in which the cumulative energy value remains at its maximum for multiple consecutive rotation cycles is identified, and this circumferential angle segment is defined as the circumferential impact density stable segment. When the number of rock-breaking behavior units in the circumferential impact density stable zone reaches a preset threshold, and all rock-breaking behavior units are located in the circumferential impact density stable zone, the rock-breaking behavior unit is determined as a local impact rock-breaking behavior unit.

[0040] Specifically, in this embodiment, after the rock-breaking behavior units and new rock-breaking behavior units have been identified in the aforementioned embodiments, the rotation angle position of the drill bit during continuous drilling is acquired, and the sampling period is kept consistent with the aforementioned embodiments, set to 0.02s. The drill bit rotation speed is maintained at 120r / min, so the time corresponding to the drill bit completing one rotation is 0.5s, and the average rotation angle change within each sampling period is approximately 14.4°. Based on this, each 0.5s is defined as a preset rotation period, and within each preset rotation period, 24 circumferential angle segments are divided according to the same 15° angle interval as in the aforementioned embodiments, thereby forming multiple rotation period intervals and their corresponding multiple circumferential angle segments. Subsequently, each identified rock-breaking behavior unit is mapped to the corresponding circumferential angle segment according to the rotation angle position corresponding to its formation time. For example, rock-breaking behavior units with formation angles in the range of 75° to 90° are mapped to the 6th circumferential angle segment, and rock-breaking behavior units with formation angles in the range of 90° to 105° are mapped to the 7th circumferential angle segment. This processing method can transform rock-breaking behavior units distributed along the time axis into a set of discrete positions distributed along the circumference of the drill bit, thereby establishing a unified spatial coordinate basis for subsequent identification of eccentric rotation state and local impact rock-breaking behavior units.

[0041] After completing the above-mentioned circumferential angle segment division and mapping, the rotation angle position, drilling load change, and rotation resistance change of the corresponding rock-breaking behavior unit are recorded in each circumferential angle segment. The product of the drilling load change and the rotation resistance change is determined as the unit impact energy value of the corresponding rock-breaking behavior unit. In this embodiment, if the drilling load change of a certain rock-breaking behavior unit is 1.8 kN and the corresponding rotation resistance change is 24 N·m, then its unit impact energy value is taken as the product of the two, 43.2; if the drilling load change of another rock-breaking behavior unit is 2.0 kN and the corresponding rotation resistance change is 25 N·m, then its unit impact energy value is taken as 50.0. Within multiple consecutive rotation cycle intervals, rock-breaking behavior units in the same circumferential angle segment are mapped to the same circumferential coordinate segment, and the number of rock-breaking behavior units and the unit impact energy value in each circumferential angle segment are accumulated, thereby forming the cumulative value of the number of circumferential rock-breaking units and the cumulative value of circumferential impact energy corresponding to each circumferential angle segment. For example, within six consecutive rotational cycle intervals, the cumulative values ​​of circumferential rock breaking quantity corresponding to the sixth circumferential angle segment are 5, 6, 5, 6, 5, 6, and the corresponding cumulative values ​​of circumferential impact energy are 210, 248, 225, 255, 232, and 260, respectively; while the cumulative values ​​of circumferential rock breaking quantity in the remaining circumferential angle segments are all no more than 4, and the cumulative values ​​of circumferential impact energy are all no more than 190. Between adjacent rotational cycle intervals, the position of the circumferential angle segment corresponding to the largest cumulative value of circumferential rock breaking quantity is continuously compared. When the angular deviation between the positions of the largest corresponding circumferential angle segments in multiple consecutive rotational cycle intervals is not greater than a preset phase-locking angle threshold, the corresponding circumferential angle segment is determined as a phase-locked circumferential segment. In this embodiment, the preset phase-locking angle threshold is set to 15°, meaning that if the largest corresponding position in adjacent cycles still falls within the same circumferential angle segment or two adjacent circumferential angle segments differing by no more than 15°, the phase-locking condition is considered met. For example, the maximum corresponding positions in the six consecutive rotational period intervals are 82°, 84°, 83°, 81°, 85°, and 84°, respectively, and their angular deviations do not exceed 4°. Therefore, the sixth circumferential angle segment can be determined as the phase-locked circumferential segment.

[0042] After obtaining the phase-locked circumferential section, local impact concentration confirmation is further performed on the same batch of rock-breaking behavior units. In this embodiment, during continuous drilling, the drill bit rotation angle position is continuously acquired, and a preset angle interval of 15° is maintained. The drill bit's rotation range is divided into multiple circumferential angle sections consistent with the above. Subsequently, within each circumferential angle section, the drilling load change and rotation resistance change corresponding to the rock-breaking behavior unit are recorded, and the product of the two is determined as the unit impact energy value. In multiple consecutive rotation cycles, the unit impact energy values ​​in the same circumferential angle section are superimposed and recorded to form the circumferential impact energy sequence corresponding to each circumferential angle section. For example, within the aforementioned six consecutive rotational cycles, the circumferential impact energy sequence for the sixth circumferential angle segment is 43.2, 50.0, 45.6, 51.0, 46.4, and 49.8, with the corresponding cumulative energy value consistently being the highest among all circumferential angle segments. The energy sequence for the seventh circumferential angle segment is 22.4, 25.0, 24.2, 23.8, 24.5, and 25.1, significantly lower than that of the sixth circumferential angle segment. Based on this, the circumferential angle segment that consistently maintains the highest cumulative energy value across multiple rotational cycles is identified, and this circumferential angle segment is defined as the stable circumferential impact density segment. In this embodiment, if the cumulative energy value of the same circumferential angle segment remains at its maximum for six consecutive rotation cycles, it is considered to meet the condition of "continuously maintaining the maximum". If the number of rock-breaking behavior units corresponding to the circumferential angle segment reaches a preset threshold, and all rock-breaking behavior units are located within the stable circumferential impact density range, then the batch of rock-breaking behavior units is identified as local impact rock-breaking behavior units. In this embodiment, the preset threshold is set to 8, meaning that the total number of rock-breaking behavior units located within the same stable circumferential impact density range within the statistical window is not less than 8. For example, if the cumulative number of rock-breaking behavior units obtained in the 6th circumferential angle segment within six consecutive rotation cycles is 33, which is significantly higher than the preset threshold, and all of these rock-breaking behavior units are located within this segment, then it is identified as a local impact rock-breaking behavior unit.

[0043] Based on the above, the eccentricity concentration results confirmed by the phase-locked circumferential section are unified with the local impact concentration results confirmed by the circumferential impact density stable section: when a certain circumferential angle section satisfies both the phase-locked circumferential section condition and the circumferential impact density stable section condition, the drill bit is determined to be in an eccentric rotation state, and the rock-breaking behavior unit formed within that circumferential angle section is identified as a local impact rock-breaking behavior unit. In this embodiment, the 6th circumferential angle section is both a phase-locked circumferential section within a continuous 6-rotation cycle interval and a circumferential impact density stable section within a continuous 6-rotation cycle. Therefore, it can be finally confirmed that the drill bit is in an eccentric rotation state, and all rock-breaking behavior units formed within this section are identified as local impact rock-breaking behavior units. If a certain circumferential angle segment has a large cumulative value of circumferential impact energy, but the maximum corresponding position change between adjacent rotation period intervals exceeds 15°, it is not considered a phase-locked circumferential segment. If a certain circumferential angle segment meets the phase-locking condition, but the corresponding circumferential impact energy sequence does not remain at its maximum, or the number of corresponding rock-breaking behavior units is less than 8, then the rock-breaking behavior units formed therein are not identified as local impact rock-breaking behavior units. The above implementation method not only fully implements the basic logic of determining the distribution of each rock-breaking behavior unit in the circumferential direction of the drill bit based on the drill bit rotation angle position, and determining that the drill bit is in an eccentric rotation state when multiple rock-breaking behavior units are distributed in the same circumferential section during continuous rotation, and identifying the rock-breaking behavior unit generated in that circumferential section as a local impact rock-breaking behavior unit, but also fully discloses the specific formation methods and parameters of the preset rotation period, circumferential angle section, unit impact energy value, cumulative value of circumferential rock-breaking quantity, cumulative value of circumferential impact energy, phase-locked circumferential section, circumferential impact energy sequence, and circumferential impact density stable section, so that this part of the technical solution has a clear data source, unified spatial mapping rules, clear judgment boundaries, and full feasibility.

[0044] Furthermore, to determine the preset rotation cycle, preset circumferential angle interval, preset phase locking angle threshold, and preset quantity threshold, multiple sets of drill bit drilling samples with circumferential wear results and multiple sets of drill bit drilling samples without circumferential wear results are first selected. In each set of samples, the rotation angle position, drilling load change, rotation resistance change, and circumferential wear distribution results corresponding to the rock breaking behavior unit are extracted. Samples with wear concentrated in a single circumferential position or adjacent circumferential positions are labeled as eccentric rotation samples, and samples with uniform circumferential wear distribution are labeled as non-eccentric rotation samples.

[0045] Subsequently, the angular offset distribution of the position corresponding to the cumulative value of the maximum circumferential rock breaking number in the eccentric rotation sample and the non-eccentric rotation sample was statistically analyzed between multiple consecutive rotation cycles, as well as the distribution of the number of rock breaking behavior units in local concentrated sections. When the maximum angular offset corresponding to the eccentric rotation sample is less than the minimum angular offset corresponding to the non-eccentric rotation sample, the maximum angular offset corresponding to the eccentric rotation sample is used as the preset phase locking angle threshold. When the maximum angular offset corresponding to the eccentric rotation sample is greater than or equal to the minimum angular offset corresponding to the non-eccentric rotation sample, the average of the two is used as the preset phase locking angle threshold.

[0046] For the number of rock-breaking behavior units in a local concentrated section, when the minimum number corresponding to the eccentrically rotated sample is greater than the maximum number corresponding to the non-eccentrically rotated sample, the minimum number corresponding to the eccentrically rotated sample is used as the preset number threshold; when the minimum number corresponding to the eccentrically rotated sample is less than or equal to the maximum number corresponding to the non-eccentrically rotated sample, the integer value obtained by rounding up the average of the two is used as the preset number threshold.

[0047] In this embodiment, 0.5s is defined as the preset rotation period, 15° as the preset circumferential angle interval, 15° as the preset phase-locking angle threshold, and 8 rock-breaking behavior units as the preset quantity threshold. Through the above calibration process, the occasional situation where circumferential rotation is concentrated but does not constitute eccentric rotation can be distinguished from the eccentric rotation state with continuous phase locking.

[0048] Step 4: After identifying the local impact rock-breaking behavior unit, when the drilling load decreases after the impact contact ends and the rotational resistance remains higher than the rotational resistance level corresponding to the stable rock-breaking stage, it is determined that slip cutting has occurred between the drill bit and the rock formation, and the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit. Given that the local impact rock-breaking behavior unit has been identified, it is further determined whether the drill bit continues to interact with the rock formation after the impact contact ends, thus distinguishing between single impact behavior and slip cutting behavior that continues after impact. A decrease in drilling load indicates that the local impact has ended, while the rotational resistance remains higher than the rotational resistance level corresponding to the stable rock-breaking stage, indicating that the drill bit has not completely detached from the rock formation, but continues to cut, rub, or drag along the contact interface after the impact. This continuous process of "impact contact + subsequent slip cutting" has a stronger impact on the local wear of the drill bit; if it is still treated only as local impact rock-breaking, it is insufficient to reflect its actual wear contribution.

[0049] The identification of composite rock-breaking behavior units in step four includes the following steps: After identifying the local impact rock-breaking behavior unit, the drilling load change and rotation resistance change corresponding to the local impact rock-breaking behavior unit are recorded, and the product of the drilling load change and rotation resistance change is determined as the impact energy value. After the impact contact ends, the continuous rotation angle section is divided into multiple energy tracking sections according to a preset angle interval. The changes in drilling load and rotation resistance are recorded in each energy tracking section. The product of the changes in drilling load and rotation resistance in each energy tracking section is determined as the sliding cutting energy value. An energy evolution sequence is constructed by matching the impact energy value with the slip cutting energy value corresponding to each energy tracking segment according to the rotation order; When the energy evolution sequence satisfies the condition that the impact energy value reaches a local peak, and the corresponding impact energy value in subsequent consecutive energy tracking segments shows a decreasing trend relative to the impact energy peak, and the sliding cutting energy value shows an increasing trend in consecutive energy tracking segments, the sliding cutting process after the end of the impact contact is defined as the impact sliding energy transfer stage. When the energy transfer phase of impact slip forms a continuous energy transfer trajectory within the same circumferential angle segment, and this energy transfer trajectory repeats in multiple consecutive rotation cycles, the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit.

[0050] Specifically, in this embodiment, the local impact rock-breaking behavior units identified in the previous embodiments are used as the starting point for composite rock-breaking identification, and the aforementioned data acquisition conditions remain unchanged, i.e., the sampling period is still 0.02s, the drill bit rotation speed is still 120r / min, the time corresponding to a single rotation cycle is still 0.5s, and the angle range corresponding to a single circumferential angle segment is still 15°. In each confirmed local impact rock-breaking behavior unit, the change in drilling load and the change in rotational resistance corresponding to that unit are recorded, and their product is determined as the impact energy value. In this embodiment, to ensure consistency with the implementation data in step three above, if the change in drilling load corresponding to a certain local impact rock-breaking behavior unit is 2.0kN and the corresponding change in rotational resistance is 25N·m, then its impact energy value is 50.0; if the change in drilling load corresponding to another local impact rock-breaking behavior unit is 1.8kN and the corresponding change in rotational resistance is 24N·m, then its impact energy value is 43.2. Based on this, starting from the end of the impact contact corresponding to the local impact rock-breaking behavior unit, the tracking continues along the subsequent rotation direction of the drill bit to track the continuous angular range adjacent to the impact position. The continuous rotation angle segment after the impact contact ends is divided into multiple energy tracking segments according to the aforementioned consistent 15° angle interval. In this embodiment, it is preferable to select four consecutive circumferential angle segments after the impact contact ends as the initial tracking range, that is, a continuous 60° rotation angle range, to ensure that the subsequent sliding cutting process can be completely covered.

[0051] Within the defined energy tracking sections, the changes in drilling load and rotational resistance for each section are recorded. The product of these changes is then used to determine the corresponding slip cutting energy value. In this embodiment, taking four consecutive energy tracking sections adjacent to the aforementioned local impact rock-breaking unit as an example, the first energy tracking section shows a drilling load change of 0.8 kN and a rotational resistance change of 22 N·m, corresponding to a slip cutting energy value of 17.6. The second energy tracking section shows a drilling load change of 1.0 kN and a rotational resistance change of 23 N·m, corresponding to a slip cutting energy value of 23.0. The third energy tracking section shows a drilling load change of 1.2 kN and a rotational resistance change of 24 N·m, corresponding to a slip cutting energy value of 28.8. The fourth energy tracking section shows a drilling load change of 1.4 kN and a rotational resistance change of 25 N·m, corresponding to a slip cutting energy value of 35.0. Simultaneously, the changes in drilling load within each energy tracking segment after the impact contact are compared with the load level corresponding to the aforementioned stable rock-breaking stage, as well as the changes in rotational resistance within each energy tracking segment with the rotational resistance level corresponding to the aforementioned stable rock-breaking stage. In this embodiment, if the rotational resistance level corresponding to the aforementioned stable rock-breaking stage is 18 N·m, then as long as the changes in rotational resistance within subsequent energy tracking segments remain higher than 18 N·m and show a decreasing trend relative to the changes in drilling load at the end of the impact contact, it can be confirmed that the drill bit and the rock formation are still in contact and slip cutting is occurring. After obtaining the impact energy value and the slip cutting energy values ​​corresponding to multiple consecutive energy tracking segments, the corresponding impact energy values ​​are further determined according to the impact component extraction results within each energy tracking segment. The initial impact energy value, the corresponding impact energy values ​​for each energy tracking segment, and the slip cutting energy values ​​for each energy tracking segment are then combined according to the rotation sequence to construct an energy evolution sequence.

[0052] The impact component and slip cutting component in each energy tracking section are distinguished as follows: taking the end time of the local impact rock breaking behavior unit as the starting point, the drilling load change curve and rotation resistance change curve in each subsequent energy tracking section are analyzed in time series; the difference in drilling load change between two adjacent sampling times is divided by the sampling time interval to obtain the load change rate, and the difference in rotation resistance change between two adjacent sampling times is divided by the sampling time interval to obtain the rotation resistance change rate.

[0053] First, signal segments confirmed to have transient impact duration are extracted from multiple sets of local impact samples, and the load change rate, rotational resistance change rate, and duration corresponding to each signal segment are statistically analyzed. Then, signal segments without transient impact characteristics are extracted from multiple sets of single sliding cutting samples, and the corresponding load change rate, rotational resistance change rate, and duration are statistically analyzed. When the minimum change rate corresponding to a local impact sample is greater than the maximum change rate corresponding to a sliding cutting sample, the minimum change rate corresponding to the local impact sample is used as the preset impact change rate threshold. When the minimum change rate corresponding to a local impact sample is less than or equal to the maximum change rate corresponding to a sliding cutting sample, the average of the two is used as the preset impact change rate threshold.

[0054] Regarding the duration, when the maximum duration corresponding to the local impact sample is less than the minimum duration corresponding to the sliding cutting sample, the maximum duration corresponding to the local impact sample is used as the preset impact duration threshold; when the maximum duration corresponding to the local impact sample is greater than or equal to the minimum duration corresponding to the sliding cutting sample, the average of the two is used as the preset impact duration threshold.

[0055] After completing the above calibration, the signal portion where both the load change rate and the rotational resistance change rate are higher than the preset impact change rate threshold, and the duration does not exceed the preset impact duration threshold, is identified as the impact component. The signal portion where both the load change rate and the rotational resistance change rate are lower than the preset impact change rate threshold, but the change in rotational resistance is consistently higher than the rotational resistance level corresponding to the stable rock-breaking stage, is identified as the slip cutting component. Subsequently, the drilling load change and rotational resistance change corresponding to the impact component in each energy tracking section are multiplied to obtain the corresponding impact energy value for that energy tracking section. The drilling load change and rotational resistance change corresponding to the slip cutting component in each energy tracking section are multiplied to obtain the corresponding slip cutting energy value for that energy tracking section.

[0056] In this embodiment, taking a complete local rock-breaking process before and after the end of impact contact as an example, the initial impact energy value is 50.0, and the corresponding impact energy values ​​for the subsequent four energy tracking segments are 32.4, 24.6, 16.8, and 9.5, respectively, and the corresponding sliding cutting energy values ​​are 17.6, 23.0, 28.8, and 35.0, respectively. To clearly define the identification boundary of the impact-slip energy transfer stage, this embodiment sets the following specific judgment conditions: First, the initial impact energy value should reach the local peak value in the local process; second, the impact energy values ​​in the subsequent three or more consecutive energy tracking segments should continuously decrease relative to the impact energy peak value; third, the sliding cutting energy values ​​in the subsequent three or more consecutive energy tracking segments should continuously increase relative to the previous energy tracking segment; fourth, within the same continuous segment, although the drilling load change decreases, the rotational resistance change should remain higher than the rotational resistance level corresponding to the aforementioned stable rock-breaking stage; fifth, the actual contact state of the subsequent segments should conform to the cutting drag characteristics, that is, the drill bit has not detached from the rock layer and continues to undergo frictional cutting in the circumferential direction. To avoid mistaking ordinary contact fluctuations for complex rock breaking, this embodiment further specifies that: if the impact energy values ​​in three or more consecutive energy tracking sections satisfy a progressively decreasing relationship, and the corresponding slip cutting energy values ​​satisfy a progressively increasing relationship, while the corresponding rotational resistance changes are all higher than 18 N·m, then this consecutive section is determined as an impact-slip energy transfer stage. For example, in the above example, the impact energy value is 50.0, the impact energy values ​​corresponding to the subsequent four sections are 32.4, 24.6, 16.8, and 9.5 respectively, the slip cutting energy values ​​corresponding to the subsequent four sections are 17.6, 23.0, 28.8, and 35.0 respectively, and the corresponding rotational resistance changes are 22 N·m, 23 N·m, 24 N·m, and 25 N·m respectively, all higher than 18 N·m. Therefore, a complete impact-slip energy transfer stage can be confirmed.

[0057] After the formation of the impact-slip energy transfer stage has been determined, its stability is further confirmed from two dimensions: circumferential position and rotation period. This ultimately identifies the impact contact and subsequent slip cutting as a composite rock-breaking behavior unit. In this embodiment, the impact-slip energy transfer stage is required to form a continuous energy transfer trajectory within the same circumferential angle segment, and this energy transfer trajectory must repeat in multiple consecutive rotation periods. Specifically, if the starting position of the impact contact falls within the same circumferential angle segment in three consecutive rotation periods, and the corresponding subsequent impact-slip energy transfer stages unfold along this circumferential angle segment and its four adjacent energy tracking segments, then the energy transfer trajectory is considered to have circumferential consistency and periodic repeatability. For example, in one embodiment, the sixth circumferential angle segment corresponds to impact contact in three consecutive rotation cycles. The initial impact energy value in the first rotation cycle is 50.0, and the corresponding impact energy values ​​for the subsequent four energy tracking segments are 32.4, 24.6, 16.8, and 9.5, respectively, with corresponding sliding cutting energy values ​​of 17.6, 23.0, 28.8, and 35.0, respectively. The initial impact energy value in the second rotation cycle is 49.2, and the subsequent four energy tracking segments... The impact energy values ​​corresponding to the tracking sections are 31.8, 24.0, 16.1, and 9.0, respectively, and the corresponding sliding cutting energy values ​​are 18.4, 24.1, 29.6, and 34.8, respectively. The initial impact energy value in the third rotation cycle is 51.0, and the impact energy values ​​corresponding to the subsequent four energy tracking sections are 33.0, 25.1, 17.3, and 9.8, respectively, and the corresponding sliding cutting energy values ​​are 19.0, 24.8, 30.2, and 35.6, respectively. Within all three rotation cycles, the initial impact energy value reaches a local peak, the subsequent impact energy value continuously decreases, the subsequent sliding cutting energy value continuously increases, and the rotational resistance remains higher than the level corresponding to the stable rock-breaking stage. Therefore, the impact contact and subsequent sliding cutting within these three cycles can be uniformly defined as a composite rock-breaking behavior unit. If a local impact process shows a decrease in the subsequent impact energy value, but the subsequent sliding cutting energy value does not show a continuous increasing trend, or the subsequent trajectory spans multiple different circumferential angle segments, or only occurs within a single rotation cycle, or the change in rotational resistance within the subsequent segment drops below 18 N·m, then it is not considered to form a composite rock-breaking behavior unit.

[0058] Furthermore, to determine the criteria for the impact slip energy transfer stage, eighteen drilling samples with identified local impact rock-breaking behavior units were selected. Data on the continuous rotation angle segment after the end of the local impact rock-breaking behavior unit were extracted from each drilling sample. Combined with the local wear pattern of the drill bit, the cutting drag marks, and the continuous wear extension results in the same circumferential position, the sample windows were marked as continuous slip cutting samples after impact and single impact termination samples, respectively.

[0059] For each sample window, 15° is used as an energy tracking segment, and subsequent angle segment data after the end of impact contact are continuously extracted; within each energy tracking segment, the corresponding value of impact energy and the value of sliding cutting energy are calculated respectively, and it is determined whether the corresponding value of impact energy decreases segment by segment, whether the value of sliding cutting energy increases segment by segment, and whether the change in rotational resistance is continuously higher than the rotational resistance level corresponding to the stable rock breaking stage in subsequent energy tracking segments.

[0060] When at least three out of four consecutive energy tracking segments satisfy the conditions of progressively decreasing impact energy, progressively increasing sliding cutting energy, and corresponding rotational resistance changes that are all higher than the rotational resistance level corresponding to the stable rock-breaking stage, the continuous segment is defined as the impact-sliding energy transfer stage. Then, the number of times the impact-sliding energy transfer stage recurs within the same circumferential angle segment is counted. When the same energy transfer trajectory recurs in three consecutive rotational cycles, a composite rock-breaking behavior unit is determined to be formed.

[0061] In this embodiment, four consecutive energy tracking segments are used as the subsequent tracking range. Three or more consecutive energy tracking segments that satisfy the condition that the impact energy value decreases segment by segment and the sliding cutting energy value increases segment by segment are determined as the impact sliding energy transfer stage. The repeated occurrence of three consecutive rotation cycles is determined as the periodic repetition condition of the composite rock breaking behavior unit.

[0062] Step 5: Accumulate the drill bit count based on different types of rock-breaking behavior units. Rock-breaking behavior units formed by stable contact are counted as the base drill count, repeated rock-breaking behavior units as the superimposed drill count, and local impact rock-breaking behavior units and composite rock-breaking behavior units as the enhanced drill count, thus obtaining the corrected drill count. All different types of rock-breaking behavior units identified in the preceding steps are uniformly incorporated into the drill bit count calculation system, and are accumulated in a graded manner based on the differences in the contribution of various rock-breaking behaviors to drill bit wear. Rock-breaking behavior units formed by stable contact correspond to the conventional rock-breaking process and are therefore counted as the base drill count; repeated rock-breaking behavior units reflect additional contact wear under vibration conditions and are therefore counted as the superimposed drill count; local impact rock-breaking behavior units and composite rock-breaking behavior units reflect intensified wear under local high load and complex contact conditions and are therefore counted as the enhanced drill count. Through this differentiated accumulation method, the drill bit count is no longer a simple count of mechanical operations, but becomes a corrected drill count corresponding to the type of rock-breaking behavior, wear intensity, and local stress state.

[0063] After identifying the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units, the drilling load change, rotation resistance change, and continuous rotation angle range corresponding to each type of rock-breaking behavior unit are obtained, and the product of the drilling load change and the rotation resistance change is determined as the rock-breaking action value. The rock-breaking action values ​​corresponding to various rock-breaking behavior units are weighted according to the preset rock-breaking contribution coefficient to determine the rock-breaking contribution of each rock-breaking behavior unit. The rock-breaking contribution is mapped to the circumferential angle section of the drill bit according to the rotation angle position, and the cumulative value of the rock-breaking contribution corresponding to each circumferential angle section is accumulated in multiple consecutive rotation cycles to form the circumferential wear contribution distribution; then, according to the pre-calibrated conversion relationship between the cumulative value of rock-breaking contribution and the equivalent drill value, the cumulative value of rock-breaking contribution corresponding to each circumferential angle section is converted into the equivalent drill value respectively. Finally, the equivalent drill bit values ​​obtained by converting the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units in each circumferential angle segment are summed to obtain the corrected drill bit number.

[0064] The application of corrected drill number includes the following steps: After obtaining the corrected drill bit count, the growth rate of the corrected drill bit count is calculated based on the change in the corrected drill bit count within multiple consecutive drilling sampling intervals. The corrected drill bit count is then compared with the preset drill bit life interval to determine the current working state of the drill bit. When the corrected drill number is within the preset normal use range and the corrected drill number growth rate is not greater than the preset growth rate threshold, maintain the current drilling load, rotation speed and drill string axial advance speed. When the corrected drill number is in the preset accelerated wear range or the corrected drill number growth rate is greater than the preset growth rate threshold, the drilling load is reduced and the axial advance speed of the drill string is reduced according to the preset adjustment range, while the drill bit rotation speed is reduced. When the corrected drill number enters the preset failure critical range, a drill bit replacement command is generated and further increases in drilling load and rotation speed are limited. When the corrected drill number enters the preset failure critical range and the corrected drill number growth rate exceeds the preset abnormal growth threshold for multiple consecutive drilling sampling intervals, a protection shutdown command is generated to terminate the current drilling process.

[0065] Specifically, in this embodiment, the rock-breaking behavior units formed by stable contact, repetitive rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units identified in the aforementioned embodiments are used as the basic input for accumulating the number of drill bits drilled. The aforementioned sampling period, angle division, and rotation period parameters remain unchanged; that is, the sampling period is still 0.02s, the drill bit rotation speed is still 120r / min, the time corresponding to a single rotation period is still 0.5s, and the single circumferential angle segment still corresponds to 15°. In each identified rock-breaking behavior unit, the corresponding changes in drilling load, rotational resistance, and continuous rotation angle range are recorded, and the product of the changes in drilling load and rotational resistance is determined as the rock-breaking effect value.

[0066] For the composite rock-breaking behavior unit, firstly, extract the drilling load change and rotational resistance change corresponding to each sampling moment in the impact contact stage, and the drilling load change and rotational resistance change corresponding to each sampling moment in the subsequent slip cutting stage; then, calculate the average value of the drilling load change in the impact contact stage and the slip cutting stage respectively, and then perform a weighted average of the two average values ​​according to the number of continuous sampling points in the stage to obtain the converted value of the drilling load change corresponding to the composite rock-breaking behavior unit; calculate the average value of the rotational resistance change in the impact contact stage and the slip cutting stage respectively, and then perform a weighted average of the two average values ​​according to the number of continuous sampling points in the stage to obtain the converted value of the rotational resistance change corresponding to the composite rock-breaking behavior unit.

[0067] In this embodiment, if the drilling load change corresponding to a rock-breaking behavior unit formed by a stable contact is 1.2 kN and the corresponding rotational resistance change is 18 N·m, then its rock-breaking effect value is 21.6, and its continuous rotational angle range is 15°; if the drilling load change corresponding to a repeated rock-breaking behavior unit is 1.5 kN and the corresponding rotational resistance change is 20 N·m, then its rock-breaking effect value is 30.0, and its continuous rotational angle range is 30°; if the drilling load change corresponding to a local impact rock-breaking behavior unit is 2.0 kN and the corresponding rotational resistance change is 25 N·m, then its rock-breaking effect value is 50.0, and its continuous rotational angle range is 15°; if the converted value of the drilling load change after the impact contact and subsequent sliding cutting is combined in a composite rock-breaking behavior unit is 2.4 kN and the converted value of the rotational resistance change is 26 N·m, then its rock-breaking effect value is 62.4, and its continuous rotational angle range is 60°.

[0068] Furthermore, to illustrate the basis for the formation of rock-breaking action value, rock-breaking contribution, and equivalent drilling value, multiple sets of full-life drilling samples completed by the same type of drill bit in the target rock formation were selected. In each set of samples, the drilling load change, rotational resistance change, continuous rotation angle range, and actual wear detection results of the drill bit at different stages were continuously recorded for various rock-breaking behavior units. Among them, the actual wear detection results include the change in tooth height, the formation of local notches, and the distribution of circumferential wear depth. For each rock-breaking behavior unit, the product of the change in drilling load and the change in rotational resistance is defined as the rock-breaking action value, which characterizes the contact action intensity corresponding to that rock-breaking behavior unit. In this embodiment, the rock-breaking action value, unit impact energy value, impact energy value, impact energy corresponding value, and slip cutting energy value are all determined by the product of the change in drilling load and the change in rotational resistance, but their corresponding objects are different: the rock-breaking action value corresponds to the overall action intensity of various rock-breaking behavior units; the unit impact energy value corresponds to the local impact intensity of a single rock-breaking behavior unit in the local impact identification process; the impact energy value corresponds to the impact action intensity of the local impact rock-breaking behavior unit in the initial stage of composite rock-breaking identification; the impact energy corresponding value corresponds to the impact component intensity formed by the continuation of local impact in each subsequent energy tracking section; and the slip cutting energy value corresponds to the action intensity of the slip cutting component in each subsequent energy tracking section.

[0069] The rock-breaking action value, behavior type weight, and continuous rotation angle correction factor are then converted into a rock-breaking contribution value to characterize the contribution of the rock-breaking behavior unit to the actual wear of the drill bit. Subsequently, all rock-breaking contributions are accumulated in each full-life drilling sample, and the accumulated rock-breaking contribution value and the actual wear detection result of the drill bit are recorded at each time after the completion of an actual borehole.

[0070] For each set of full-life drilling samples, the cumulative rock-breaking contribution after completing a single actual borehole is first recorded as the single-hole cumulative rock-breaking contribution; then the average value of the single-hole cumulative rock-breaking contribution in all calibration samples is calculated, and this average value is determined as the conversion benchmark corresponding to an equivalent drilling value.

[0071] In this embodiment, among all calibration samples of the same type of drill bit and the same target rock stratum category, the average cumulative rock breaking contribution of a single hole is 100. Therefore, the cumulative rock breaking contribution of 100 corresponds to one equivalent drill value. In subsequent online conversion, the cumulative rock breaking contribution value corresponding to each circumferential angle segment is divided by 100 to obtain the corresponding equivalent drill value.

[0072] The conversion relationship between the cumulative rock-breaking contribution and the equivalent drill value is applicable to the calculation of the corrected drill number for the same type of drill bit under the target rock stratum category, and is established using a linear conversion method. The preset difference range between the target rock stratum category and the benchmark rock stratum category is jointly limited by the difference range of uniaxial compressive strength and the difference range of rock stratum integrity coefficient. When the deviation of the uniaxial compressive strength of the target rock stratum from the benchmark rock stratum exceeds 10%, or the deviation of the rock stratum integrity coefficient of the target rock stratum from the benchmark rock stratum exceeds 10%, the target rock stratum category is determined to exceed the preset difference range relative to the benchmark rock stratum category. In this case, the corresponding sample is re-collected and the conversion relationship between the cumulative rock-breaking contribution and the equivalent drill value is re-determined.

[0073] After obtaining the rock-breaking action values ​​and continuous rotation angle ranges corresponding to various rock-breaking behavior units, the rock-breaking action values ​​corresponding to different types of rock-breaking behavior units are weighted according to a pre-set rock-breaking contribution coefficient to determine the rock-breaking contribution of each rock-breaking behavior unit. In this embodiment, the pre-set rock-breaking contribution coefficient is determined based on the difference in contribution of various rock-breaking behaviors to the actual wear of the drill bit. Specifically, the pre-set rock-breaking contribution coefficient for rock-breaking behavior units with stable contact is 1.00, the pre-set rock-breaking contribution coefficient for repeated rock-breaking behavior units is 1.25, the pre-set rock-breaking contribution coefficient for local impact rock-breaking behavior units is 1.80, and the pre-set rock-breaking contribution coefficient for composite rock-breaking behavior units is 2.20.

[0074] The aforementioned preset rock-breaking contribution coefficients are determined as follows: In multiple sets of calibration samples, the actual wear increments corresponding to rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units are extracted respectively, and the unit angle wear contribution value of the four types of rock-breaking behavior units is calculated respectively; wherein, the unit angle wear contribution value is obtained by dividing the actual wear increment corresponding to the rock-breaking behavior unit by the total continuous rotation angle corresponding to the rock-breaking behavior unit.

[0075] Then, the average unit angle wear contribution value corresponding to the rock-breaking behavior unit formed by stable contact is used as the benchmark value 1.00. The average unit angle wear contribution values ​​corresponding to the repeated rock-breaking behavior unit, the local impact rock-breaking behavior unit, and the composite rock-breaking behavior unit are divided by the benchmark value 1.00 respectively to obtain the relative wear contribution ratios corresponding to the three types of rock-breaking behavior units. The relative wear contribution ratios are then determined as the corresponding preset rock-breaking contribution coefficients.

[0076] In this embodiment, after sample calibration, the preset rock-breaking contribution coefficient corresponding to the repeated rock-breaking behavior unit is determined to be 1.25, the preset rock-breaking contribution coefficient corresponding to the local impact rock-breaking behavior unit is determined to be 1.80, and the preset rock-breaking contribution coefficient corresponding to the composite rock-breaking behavior unit is determined to be 2.20.

[0077] Meanwhile, in order to reflect the influence of the continuous rotation angle range on wear contribution, the rock breaking contribution is calculated in the following way in this embodiment: taking 15° as the unit angle reference, the continuous rotation angle range of a certain rock breaking behavior unit is divided by 15° to obtain the angle correction multiple, and then the corresponding rock breaking action value is multiplied by the corresponding preset rock breaking contribution coefficient and the angle correction multiple to obtain the rock breaking contribution of the rock breaking behavior unit. For example, the rock-breaking action value of the rock-breaking behavior unit formed by the aforementioned stable contact is 21.6 and the angle correction factor is 1, so its rock-breaking contribution is 21.6 × 1.00 × 1 = 21.6; the rock-breaking action value of the aforementioned repeated rock-breaking behavior unit is 30.0 and the angle correction factor is 2, so its rock-breaking contribution is 30.0 × 1.25 × 2 = 75.0; the rock-breaking action value of the aforementioned local impact rock-breaking behavior unit is 50.0 and the angle correction factor is 1, so its rock-breaking contribution is 50.0 × 1.80 × 1 = 90.0; the rock-breaking action value of the aforementioned composite rock-breaking behavior unit is 62.4 and the angle correction factor is 4, so its rock-breaking contribution is 62.4 × 2.20 × 4 = 549.12.

[0078] After obtaining the rock-breaking contribution values ​​corresponding to various rock-breaking behavior units, the rock-breaking contribution values ​​are mapped to the circumferential angle segments of the drill bit according to the rotation angle position corresponding to the formation time. The cumulative value of the rock-breaking contribution value corresponding to each circumferential angle segment is accumulated over multiple consecutive rotation cycles to form the circumferential wear contribution distribution. In this embodiment, the aforementioned 15° circumferential angle segment division method is still adopted. If a rock-breaking behavior unit formed by stable contact is formed in the 75° to 90° segment, its rock-breaking contribution value is included in the 6th circumferential angle segment; if a local impact rock-breaking behavior unit is formed in the 90° to 105° segment, its rock-breaking contribution value is included in the 7th circumferential angle segment; if a composite rock-breaking behavior unit covers the 90° to 150° range, it is allocated and accumulated according to its corresponding 4 consecutive circumferential angle segments. In this embodiment, within 10 consecutive rotation cycles, the cumulative rock-breaking contribution value of the 6th circumferential angle segment is 680.4, the cumulative rock-breaking contribution value of the 7th circumferential angle segment is 742.8, and the cumulative rock-breaking contribution values ​​of the remaining circumferential angle segments are all below 500. Therefore, the 7th circumferential angle segment can be determined as the segment with the largest cumulative rock-breaking contribution value, and this segment is identified as the main wear concentration segment.

[0079] The main wear concentration zone is used to determine the location of concentrated circumferential wear on the drill bit. The corrected drill bit count is obtained by accumulating the equivalent drill bit count corresponding to all circumferential angle zones.

[0080] To convert the wear contribution corresponding to the circumferential angle segment into a uniform quantity that can be used for drill bit count accumulation, this embodiment stipulates that 100 of the cumulative rock-breaking contribution value corresponds to 1.0 equivalent drill bit value. Therefore, the cumulative rock-breaking contribution value of 742.8 corresponding to the 7th circumferential angle segment can be converted into an equivalent drill bit value of 7.428. Subsequently, according to the aforementioned equivalent drill bit value conversion relationship, the equivalent drill bit values ​​corresponding to the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units are accumulated to obtain the drill bit correction drill bit value. For example, in a certain drilling operation section, the equivalent drill bit value after conversion of all rock-breaking behavior units formed by stable contact is 12.6, the equivalent drill bit value after conversion of all repeated rock-breaking behavior units is 8.4, the equivalent drill bit value after conversion of all local impact rock-breaking behavior units is 9.2, and the equivalent drill bit value after conversion of all composite rock-breaking behavior units is 14.7. Then, the final accumulated drill bit correction drill bit value is 44.9.

[0081] After obtaining the corrected drill bit count, the growth rate of the corrected drill bit count is calculated based on the change in the corrected drill bit count within multiple consecutive drilling sampling intervals. The corrected drill bit count is then compared with a preset drill bit lifespan interval to determine the current working state of the drill bit, and further adjustments or protective controls are implemented for the drilling parameters. In this embodiment, the drilling sampling interval is 30 seconds, meaning the corrected drill bit count is updated every 30 seconds. The growth rate of the corrected drill bit count is calculated by dividing the difference in the corrected drill bit count between two adjacent drilling sampling intervals by 30 seconds. For example, if the corrected drill bit count at a certain moment is 44.9, and the corrected drill bit count at the end of the next drilling sampling interval is 46.1, then the corresponding growth rate of the corrected drill bit count is (46.1-44.9) / 30, which corresponds to a growth rate of 0.04, in equivalent drill bit counts per second. In this embodiment, the preset drill bit life range is specifically divided as follows: 0 to 50 is the preset normal use range, 50 to 70 is the preset accelerated wear range, and above 70 is the preset failure critical range; the preset growth rate threshold is 0.05 equivalent drill bits / second, and the preset abnormal growth threshold is 0.08 equivalent drill bits / second.

[0082] The preset drill bit life range, preset growth rate threshold, and preset abnormal growth threshold are determined as follows: In multiple sets of full-life drilling samples, the stage in which the drill bit can still maintain stable drilling efficiency and no obvious wear expansion is taken as the normal use stage; the stage in which the circumferential local wear expansion of the drill bit accelerates and the cumulative rock breaking contribution per unit time increases significantly is taken as the accelerated wear stage; and the stage in which the drill bit has local defects, wear instability, or drilling parameters are difficult to maintain stable control is taken as the failure critical stage. Then, the corrected drill number value range and the corrected drill number growth rate value range corresponding to the normal use stage, the accelerated wear stage, and the failure critical stage are calculated respectively.

[0083] When the maximum corrected drill number corresponding to the normal use phase is less than the minimum corrected drill number corresponding to the accelerated wear phase, the maximum corrected drill number corresponding to the normal use phase is used as the upper limit of the preset normal use range, and the minimum corrected drill number corresponding to the accelerated wear phase is used as the lower limit of the preset accelerated wear range; when the maximum corrected drill number corresponding to the normal use phase is greater than or equal to the minimum corrected drill number corresponding to the accelerated wear phase, the average of the two is used as the upper limit of the preset normal use range and the lower limit of the preset accelerated wear range.

[0084] When the maximum corrected drill number corresponding to the accelerated wear stage is less than the minimum corrected drill number corresponding to the critical failure stage, the maximum corrected drill number corresponding to the accelerated wear stage is used as the upper limit of the preset accelerated wear range, and the minimum corrected drill number corresponding to the critical failure stage is used as the lower limit of the preset critical failure range; when the maximum corrected drill number corresponding to the accelerated wear stage is greater than or equal to the minimum corrected drill number corresponding to the critical failure stage, the average of the two is used as the upper limit of the preset accelerated wear range and the lower limit of the preset critical failure range.

[0085] For the corrected drill number growth rate, when the maximum corrected drill number growth rate corresponding to the normal use stage is less than the minimum corrected drill number growth rate corresponding to the accelerated wear stage, the maximum corrected drill number growth rate corresponding to the normal use stage is used as the preset growth rate threshold; when the maximum corrected drill number growth rate corresponding to the normal use stage is greater than or equal to the minimum corrected drill number growth rate corresponding to the accelerated wear stage, the average of the two is used as the preset growth rate threshold.

[0086] For the preset abnormal growth threshold, when the maximum corrected drill number growth rate corresponding to the accelerated wear stage is less than the minimum corrected drill number growth rate corresponding to the failure critical stage, the maximum corrected drill number growth rate corresponding to the accelerated wear stage is used as the preset abnormal growth threshold; when the maximum corrected drill number growth rate corresponding to the accelerated wear stage is greater than or equal to the minimum corrected drill number growth rate corresponding to the failure critical stage, the average of the two is used as the preset abnormal growth threshold.

[0087] Through the above methods, the preset normal use range, preset accelerated wear range, preset failure critical range, preset growth rate threshold, and preset abnormal growth threshold all have clear sample sources, clear statistical basis, and clear determination rules.

[0088] When the corrected drill bit count is within the preset normal operating range and the increase rate of the corrected drill bit count is no greater than 0.05 equivalent drill bit counts / second, the current drilling load, rotation speed, and drill bit axial advance speed remain unchanged. When the corrected drill bit count is within the preset accelerated wear range or the increase rate of the corrected drill bit count is greater than 0.05 equivalent drill bit counts / second, the drilling load and drill bit axial advance speed are reduced according to the preset adjustment range, and the drill bit rotation speed is reduced at the same time. In this embodiment, the preset adjustment range is: drilling load reduced by 10%, drill bit axial advance speed reduced by 8%, and drill bit rotation speed reduced by 6%. When the corrected drill bit count enters the preset failure critical range, a drill bit replacement command is generated and further increases in drilling load and rotation speed are limited. When the corrected drill bit count enters the preset failure critical range and the increase rate of the corrected drill bit count is greater than 0.08 equivalent drill bit counts / second in three consecutive drilling sampling intervals, a protection shutdown command is generated to terminate the current drilling process.

[0089] On the other hand, a drill bit count control system in this embodiment includes: The data acquisition module is used to acquire changes in drilling load, rotational resistance, and axial movement of the drill bit during the drilling process. The rock-breaking contact recognition module is used to identify the contact establishment process between the drill bit teeth and the rock strata at the bottom of the hole based on the relationship between the changes in drilling load, the changes in rotational resistance and the changes in the axial movement of the drill bit. When the drilling load increases relative to the stable drilling state within a preset time interval and the rotational resistance increases synchronously, and the axial advance speed of the drill bit decreases, it is determined that the drill bit teeth and the rock strata have formed rock-breaking contact, and the rock-breaking contact is identified as a rock-breaking behavior unit. The repeated rock breaking identification module is used to continuously identify the contact changes between the drill bit and the rock formation after identifying the rock breaking behavior unit. When the drill bit makes contact, detaches and then makes contact with the rock formation again during continuous drilling, the process of re-establishing contact is identified as a new rock breaking behavior unit to identify repeated rock breaking behavior caused by drill vibration. The eccentric impact identification module is used to determine the distribution of each rock-breaking behavior unit in the circumferential direction of the drill bit based on the rotation angle position of the drill bit. When multiple rock-breaking behavior units are distributed in the same circumferential section during continuous rotation, it is determined that the drill bit is in an eccentric rotation state, and the rock-breaking behavior unit generated in that circumferential section is identified as a local impact rock-breaking behavior unit. The composite rock breaking identification module is used to identify local impact rock breaking behavior units. When the drilling load decreases after the impact contact ends and the rotational resistance remains higher than the rotational resistance level corresponding to the stable rock breaking stage, it determines that slip cutting has occurred between the drill bit and the rock layer, and identifies the impact contact and subsequent slip cutting as a composite rock breaking behavior unit. The corrected drill count determination module is used to accumulate the drill bit count based on different types of rock-breaking behavior units. Rock-breaking behavior units formed by stable contact are counted as the basic drill count, repeated rock-breaking behavior units are counted as the superimposed drill count, and local impact rock-breaking behavior units and composite rock-breaking behavior units are counted as the enhanced drill count, thereby obtaining the corrected drill count.

[0090] The data acquisition module's output is connected to the rock-breaking contact recognition module, repeated rock-breaking recognition module, eccentric impact recognition module, and composite rock-breaking recognition module, respectively, to provide drilling load, rotational resistance, drill string axial displacement, and drill bit rotation angle data to each recognition module. The rock-breaking contact recognition module is used to form dynamic reference sections, contact judgment windows, and rock-breaking behavior unit sequences. The repeated rock-breaking recognition module is used to form contact state sequences based on the rock-breaking behavior unit sequences and rotation angle sections, and output new rock-breaking behavior units. The eccentric impact recognition module is used to form cumulative circumferential rock-breaking quantity values, cumulative circumferential impact values, and phase-locked circumferential sections based on the circumferential mapping results of each rock-breaking behavior unit, and outputs local impact rock-breaking behavior units. The composite rock-breaking recognition module is used to... After identifying local impact rock-breaking behavior units, the changes in drilling load and rotational resistance corresponding to these units are recorded, and the impact energy value is determined. Within the continuous rotation angle segment after the impact contact ends, the changes in drilling load and rotational resistance are recorded, and the slip cutting energy value corresponding to each energy tracking segment is determined. An energy evolution sequence is constructed based on the corresponding impact energy value and slip cutting energy value for each energy tracking segment, and composite rock-breaking behavior units are identified based on this sequence. The corrected drill number determination module is used to obtain the corrected drill number based on the rock-breaking action value, rock-breaking contribution, and equivalent drill number conversion relationship corresponding to various rock-breaking behavior units, and outputs drilling parameter adjustment commands or protection shutdown commands based on the corrected drill number and its growth rate.

[0091] The judgment and conversion relationships used for rock-breaking contact identification, repeated rock-breaking identification, eccentric rotation identification, composite rock-breaking identification, and correction of drill number conversion are all determined in the following way: Select multiple sets of drilling samples of the same type of drill bit in the target rock formation, and continuously collect drilling load, rotational resistance, drill string axial displacement, drill bit rotation angle, and drill bit wear detection results in each set of drilling samples; first, mark the state of the samples according to the actual contact state between the drill bit and the rock formation, the circumferential wear position of the drill bit, and the wear degree, and then extract the characteristic parameter distribution ranges corresponding to the rock-breaking behavior formed by stable contact, repeated rock-breaking behavior, local impact rock-breaking behavior, and composite rock-breaking behavior.

[0092] For any identification parameter, when the minimum value corresponding to a positive sample is greater than the maximum value corresponding to a negative sample, the minimum value corresponding to a positive sample is used as the judgment threshold for the identification parameter; when the minimum value corresponding to a positive sample is less than or equal to the maximum value corresponding to a negative sample, the average value of the minimum value corresponding to a positive sample and the maximum value corresponding to a negative sample is used as the judgment threshold for the identification parameter.

[0093] The conversion factor for corrected drill number is determined by the average cumulative rock breaking contribution of a single hole in multiple sets of full-life drilling samples. Each identification threshold, contribution factor, and conversion factor corresponds to the specific sample statistical results and calibration results.

[0094] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for controlling the number of drill bits, characterized in that, include: Step 1: During the drilling process, obtain the changes in drilling load, rotational resistance, and axial motion of the drill bit. Based on the relationship between these three changes, identify the contact establishment process between the drill bit teeth and the rock strata at the bottom of the hole. When the drilling load increases relative to the stable drilling state within a preset time interval and the rotational resistance increases synchronously, while the axial advance speed of the drill bit decreases, it is determined that the drill bit teeth and the rock strata form a rock-breaking contact, and the rock-breaking contact is identified as the rock-breaking behavior unit. Step 2: After identifying the rock-breaking behavior unit, continue to identify the contact changes between the drill bit and the rock formation. When the drill bit makes contact, detaches and then makes contact with the rock formation again during continuous drilling, the process of re-establishing contact is identified as a new rock-breaking behavior unit in order to identify repeated rock-breaking behavior caused by drill vibration. Step 3: Determine the distribution of each rock-breaking behavior unit in the circumferential direction of the drill bit based on the rotation angle of the drill bit. When multiple rock-breaking behavior units are distributed in the same circumferential section during continuous rotation, it is determined that the drill bit is in an eccentric rotation state, and the rock-breaking behavior unit generated in that circumferential section is identified as a local impact rock-breaking behavior unit. Step 4: After identifying the local impact rock-breaking behavior unit, when the drilling load decreases after the impact contact ends and the rotational resistance remains higher than the rotational resistance level corresponding to the stable rock-breaking stage, it is determined that slip cutting has occurred between the drill bit and the rock strata, and the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit. Step 5: Accumulate the drill bit count based on different types of rock-breaking behavior units. Rock-breaking behavior units formed by stable contact are counted as the basic drill count, repeated rock-breaking behavior units are counted as the superimposed drill count, and local impact rock-breaking behavior units and composite rock-breaking behavior units are counted as the enhanced drill count, thus obtaining the corrected drill count.

2. The drill bit count control method according to claim 1, characterized in that, The identification of rock-breaking contact in step one includes the following steps: During continuous drilling, a dynamic reference section is constructed based on the drilling section that was in a stable drilling state before the current drilling moment, and the drilling load reference level, rotational resistance reference level, and drill string axial advance speed reference level are determined within the dynamic reference section. A contact determination window is established after the dynamic reference section, and the changes in drilling load, rotational resistance, and axial advance speed of the drill string are obtained within the contact determination window. When the changes in drilling load, rotational resistance, and axial advance speed of the drill bit simultaneously meet the rock-breaking contact determination conditions within the same contact determination window, it is determined that the drill bit teeth and the rock strata form rock-breaking contact and form a rock-breaking behavior unit. During continuous drilling, the dynamic reference section is reconstructed according to the preset update cycle, and the drilling load reference level, rotational resistance reference level and drill string axial advance speed reference level are re-determined based on the updated dynamic reference section.

3. The drill bit count control method according to claim 1, characterized in that, The identification of repetitive rock-breaking behavior in step two includes the following steps: After identifying the rock-breaking behavior unit, the change in the drill bit rotation angle is continuously acquired, and the continuously acquired change in rotation angle is recorded in segments according to the preset angle interval to form multiple angle change segments. Within each angle change range, the changes in drilling load and rotational resistance are recorded respectively. The contact state is determined based on the direction of change of drilling load and rotational resistance. When both the changes in drilling load and rotational resistance increase simultaneously, the contact is established. When both the changes in drilling load and rotational resistance decrease simultaneously, the contact is released. The contact state within multiple angle change segments is continuously determined according to the rotation sequence. When the contact establishment state, contact dissolution state, and contact re-establishment state appear sequentially within the continuous angle change segment, a contact state sequence is formed. When the number of angle change segments corresponding to the formed contact state sequence reaches the preset angle segment continuity threshold, and the rotation angle range between the contact establishment state and the re-contact establishment state is not less than the minimum repeated rock breaking angle range, the angle change segment corresponding to the re-contact establishment state is determined as the repeated rock breaking contact segment, and the contact process corresponding to the repeated rock breaking contact segment is determined as a new rock breaking behavior unit. If a contact state sequence that meets the continuity threshold of the angle segment is not formed within the continuous angle change segment, or if the rotation angle range between the contact establishment state and the re-contact establishment state is less than the minimum repeating rock breaking angle range, the corresponding contact process will not be identified as a new rock breaking behavior unit.

4. The drill bit count control method according to claim 1, characterized in that, The identification of eccentric rotation and local impact rock-breaking behavior units in step three includes the following steps: During continuous drilling, multiple rotation cycle intervals are divided according to a preset rotation cycle, and within each rotation cycle interval, multiple circumferential angle segments are divided according to a preset circumferential angle interval. Record the rotation angle position, drilling load change and rotation resistance change corresponding to the rock breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value of the corresponding rock breaking behavior unit by multiplying the drilling load change and the rotation resistance change. The rock-breaking behavior units in the same circumferential angle segment within multiple rotation period intervals are mapped to the same circumferential coordinate segment, and the number of rock-breaking behavior units and the unit impact energy value in each circumferential angle segment are accumulated to form the cumulative value of the number of circumferential rock-breaking units and the cumulative value of circumferential impact energy corresponding to each circumferential angle segment. Compare the positions of the circumferential angle segments corresponding to the largest cumulative value of circumferential rock breaking between adjacent rotation cycle intervals. When the angle deviation between the positions of the largest corresponding circumferential angle segments in multiple consecutive rotation cycle intervals is not greater than the preset phase locking angle threshold, the corresponding circumferential angle segment is determined as the phase locking circumferential segment. When the cumulative value of circumferential impact energy in the phase-locked circumferential section is greater than the cumulative value of circumferential impact energy in other circumferential angle sections, and the number of rock-breaking behavior units in the phase-locked circumferential section reaches a preset threshold, the drill bit is determined to be in an eccentric rotation state, and the rock-breaking behavior units formed in the phase-locked circumferential section are identified as local impact rock-breaking behavior units.

5. The drill bit count control method according to claim 4, characterized in that, Step 3, the identification of local impact rock-breaking behavior units, includes the following steps: During continuous drilling, the rotation angle position of the drill bit is obtained, and the rotation range of the drill bit is divided into multiple circumferential angle segments according to a preset angle interval; Record the changes in drilling load and rotational resistance corresponding to the rock-breaking behavior unit in each circumferential angle segment, and determine the unit impact energy value by multiplying the changes in drilling load and rotational resistance. The impact energy values ​​of units in the same circumferential angle segment are superimposed and recorded within multiple consecutive rotation cycles to form a circumferential impact energy sequence corresponding to each circumferential angle segment. In the circumferential impact energy sequence, the circumferential angle segment in which the cumulative energy value remains at its maximum for multiple consecutive rotation cycles is identified, and this circumferential angle segment is defined as the circumferential impact density stable segment. When the number of rock-breaking behavior units in the circumferential impact density stable zone reaches a preset threshold, and all rock-breaking behavior units are located in the circumferential impact density stable zone, the rock-breaking behavior unit is determined as a local impact rock-breaking behavior unit.

6. The drill bit count control method according to claim 1, characterized in that, The identification of composite rock-breaking behavior units in step four includes the following steps: After identifying the local impact rock-breaking behavior unit, the drilling load change and rotation resistance change corresponding to the local impact rock-breaking behavior unit are recorded, and the product of the drilling load change and rotation resistance change is determined as the impact energy value. After the impact contact ends, the continuous rotation angle section is divided into multiple energy tracking sections according to a preset angle interval. The changes in drilling load and rotation resistance are recorded in each energy tracking section. The product of the changes in drilling load and rotation resistance in each energy tracking section is determined as the sliding cutting energy value. An energy evolution sequence is constructed by matching the impact energy value with the slip cutting energy value corresponding to each energy tracking segment according to the rotation order; When the energy evolution sequence satisfies the condition that the impact energy value reaches a local peak, and the corresponding impact energy value in subsequent consecutive energy tracking segments shows a decreasing trend relative to the impact energy peak, and the sliding cutting energy value shows an increasing trend in consecutive energy tracking segments, the sliding cutting process after the end of the impact contact is defined as the impact sliding energy transfer stage. When the energy transfer phase of impact slip forms a continuous energy transfer trajectory within the same circumferential angle segment, and this energy transfer trajectory repeats in multiple consecutive rotation cycles, the impact contact and subsequent slip cutting are identified as a composite rock-breaking behavior unit.

7. The drill bit count control method according to claim 1, characterized in that, Step five, determining the correct drill number, includes the following steps: After identifying the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units, the drilling load change, rotation resistance change, and continuous rotation angle range corresponding to each type of rock-breaking behavior unit are obtained, and the product of the drilling load change and the rotation resistance change is determined as the rock-breaking action value. The rock-breaking action values ​​corresponding to various rock-breaking behavior units are weighted according to the preset rock-breaking contribution coefficient to determine the rock-breaking contribution of each rock-breaking behavior unit. The rock-breaking contribution is mapped to the circumferential angle section of the drill bit according to the rotation angle position, and the cumulative value of the rock-breaking contribution corresponding to each circumferential angle section is accumulated in multiple consecutive rotation cycles to form the circumferential wear contribution distribution; then, according to the pre-calibrated conversion relationship between the cumulative value of rock-breaking contribution and the equivalent drill value, the cumulative value of rock-breaking contribution corresponding to each circumferential angle section is converted into the equivalent drill value respectively. Finally, the equivalent drill bit values ​​obtained by converting the rock-breaking behavior units formed by stable contact, repeated rock-breaking behavior units, local impact rock-breaking behavior units, and composite rock-breaking behavior units in each circumferential angle segment are summed to obtain the corrected drill bit number.

8. The drill bit count control method according to claim 7, characterized in that, The application of corrected drill number in step five includes the following steps: After obtaining the corrected drill bit count, the growth rate of the corrected drill bit count is calculated based on the change in the corrected drill bit count within multiple consecutive drilling sampling intervals. The corrected drill bit count is then compared with the preset drill bit life interval to determine the current working state of the drill bit. When the corrected drill number is within the preset normal use range and the corrected drill number growth rate is not greater than the preset growth rate threshold, maintain the current drilling load, rotation speed and drill string axial advance speed. When the corrected drill number is in the preset accelerated wear range or the corrected drill number growth rate is greater than the preset growth rate threshold, the drilling load is reduced and the axial advance speed of the drill string is reduced according to the preset adjustment range, while the drill bit rotation speed is reduced. When the corrected drill number enters the preset failure critical range, a drill bit replacement command is generated and further increases in drilling load and rotation speed are limited. When the corrected drill number enters the preset failure critical range and the corrected drill number growth rate exceeds the preset abnormal growth threshold for multiple consecutive drilling sampling intervals, a protection shutdown command is generated to terminate the current drilling process.

9. A drill bit count control system, characterized in that, The control system employs the control method described in any one of claims 1-8.

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