Method and device for determining formation threshold weight and threshold torque
By acquiring and correcting drilling pressure, torque, and vibration parameters at different top drive speeds, the formation threshold drilling pressure and torque are determined, solving the problem of poor accuracy in existing technologies, enabling more precise selection of drill bits and screws, and improving rock breaking efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- CHINA PETROLEUM & CHEMICAL CORP
- Filing Date
- 2022-10-13
- Publication Date
- 2026-07-24
AI Technical Summary
The existing methods for determining formation threshold drilling pressure and threshold torque are complex and have poor accuracy, which cannot effectively guide the selection of drill bits and screws, resulting in low rock breaking efficiency.
By acquiring the mechanical drilling speed, torque value, and drill bit vibration parameters within the preset drilling pressure range at different preset top drive speeds, the initial threshold drilling pressure and initial threshold torque are determined. The corrected threshold drilling pressure and corrected threshold torque are then obtained by correcting the drill bit vibration parameters, and finally the formation threshold drilling pressure and formation threshold torque are determined.
The calculation method is simplified, the accuracy of formation threshold drilling pressure and threshold torque is improved, and the selection of drill bit and screw can be effectively guided, thereby improving mechanical drilling speed and rock breaking efficiency.
Smart Images
Figure CN117932187B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the field of drilling engineering technology, and more specifically to a method for determining formation threshold drilling pressure and threshold torque, a device for determining formation threshold drilling pressure and threshold torque, an electronic device, and a machine-readable storage medium. Background Technology
[0002] In formation drilling, clearly defining the formation's threshold pressure on drill bit (PBD) and threshold torque is crucial for guiding the optimal selection of drill bits and screws, and for improving drilling efficiency. If the screw torque exceeds the formation's threshold torque significantly during drilling, it will lead to wasted screw energy and a reduction in screw speed. Conversely, insufficient screw torque will make it difficult for the drill bit to break rocks, drastically reducing the rate of penetration (ROP). Therefore, the need to clearly define the threshold PBD and threshold torque for different formations is extremely urgent in drilling operations.
[0003] Currently, there are three main methods for obtaining threshold drilling pressure and threshold torque: theoretical calculation, numerical simulation, and empirical summarization. Theoretical calculation relies primarily on empirical formulas. However, due to the numerous parameters involved in drill bit rock breaking, such as drill bit rotation speed, torque, drilling pressure, and cutting tooth structure, and the coupling between these parameters, the results of theoretical calculations differ significantly from actual drilling conditions, making it difficult to provide practical guidance. Numerical simulation methods are similar to theoretical calculations, but their accuracy differs greatly from actual field conditions. Empirical summarization is based on the analysis of large amounts of data from a block. However, the recommended drilling pressure range given in local practices is often small, failing to reach the optimal drilling pressure range. Furthermore, differences in screw product models, drill bit manufacturers, and types also make it difficult to obtain accurate threshold drilling pressure and threshold torque in the field. Summary of the Invention
[0004] The purpose of this invention is to provide a method and apparatus for determining formation threshold drilling pressure and threshold torque. This method and apparatus solves the problems of the prior art, which uses theoretical calculations, numerical simulations and empirical summaries to obtain formation threshold drilling pressure and threshold torque, resulting in complex methods, poor accuracy, and inability to effectively guide the selection of drill bits and screws, leading to low rock breaking efficiency.
[0005] To achieve the above objectives, embodiments of the present invention provide a method for determining formation threshold drilling pressure and threshold torque, comprising:
[0006] Under different preset top drive speeds, the mechanical drilling speed, torque value, and drill bit vibration parameters are obtained for different drilling pressure values within a preset drilling pressure range.
[0007] For each preset top drive speed:
[0008] Based on the drilling pressure value at the preset top drive speed and the mechanical drilling speed corresponding to the drilling pressure value, the initial threshold drilling pressure at the preset top drive speed is determined from the drilling pressure value;
[0009] Based on the initial threshold drilling pressure at the preset top drive speed, the torque value corresponding to the preset top drive speed is determined as the initial threshold torque at the preset top drive speed.
[0010] Based on the drill bit vibration parameters at the preset top drive speed, the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed are corrected to obtain the corrected threshold drill pressure and corrected threshold torque.
[0011] The modified threshold drilling pressure and modified threshold torque corresponding to different preset top drive speeds are used as the formation threshold drilling pressure and formation threshold torque.
[0012] Optionally, the difference between adjacent drill pressure values within the preset drill pressure range is equal.
[0013] Optionally, based on the drill pressure value at the preset top drive speed and the corresponding mechanical drilling rate, the initial threshold drill pressure at the preset top drive speed is determined from the drill pressure value, including:
[0014] Sort the drill pressure values in ascending order of their change.
[0015] Compare the mechanical drilling rates corresponding to every two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure.
[0016] Optionally, based on the drill bit vibration parameters at the preset top drive speed, the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed are corrected to obtain the corrected threshold drill pressure and corrected threshold torque, including:
[0017] If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed meet the preset rules, then the initial threshold drilling pressure and initial threshold torque of the preset top drive speed are retained.
[0018] If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed do not meet the preset rules, then delete the initial threshold drilling pressure and initial threshold torque of the preset top drive speed.
[0019] Optionally, the drill bit vibration parameters include: lateral vibration acceleration, axial vibration acceleration, and torsional vibration value;
[0020] The preset rules include:
[0021] The lateral vibration acceleration does not exceed the first preset threshold, or the axial vibration acceleration does not exceed the second preset threshold, or the torsional vibration value does not exceed the third preset threshold.
[0022] This invention also provides a device for determining formation threshold drilling pressure and threshold torque, comprising:
[0023] The data acquisition module is used to acquire the mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range under different preset top drive speeds.
[0024] The initial threshold drilling pressure determination module is used to determine the initial threshold drilling pressure at the corresponding preset top drive speed based on the drilling pressure value of the corresponding preset top drive speed and the mechanical drilling speed corresponding to the drilling pressure value.
[0025] The initial threshold torque determination module is used to determine the torque value at the corresponding preset top drive speed as the initial threshold torque at the corresponding preset top drive speed based on the initial threshold drilling pressure at the corresponding preset top drive speed.
[0026] The correction module is used to correct the initial threshold drilling pressure and initial threshold torque corresponding to the corresponding preset top drive speed based on the drill bit vibration parameters at the corresponding preset top drive speed, so as to obtain the corrected threshold drilling pressure and corrected threshold torque.
[0027] The results output module is used to take the modified threshold drilling pressure and modified threshold torque corresponding to different preset top drive speeds as the formation threshold drilling pressure and formation threshold torque.
[0028] Optionally, the difference between adjacent drill pressure values within the preset drill pressure range is equal.
[0029] Optionally, the initial threshold drilling pressure determination module is specifically used for:
[0030] Sort the drill pressure values in ascending order of their change.
[0031] Compare the mechanical drilling rates corresponding to every two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure.
[0032] On the other hand, the present invention provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the above-described method for determining formation threshold drilling pressure and threshold torque.
[0033] On the other hand, the present invention provides a machine-readable storage medium storing instructions for causing a machine to perform the above-described method for determining formation threshold drilling pressure and threshold torque.
[0034] This technical solution obtains the mechanical drilling speed, torque value, and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range at different top drive speeds. It then determines the initial threshold drilling pressure and initial threshold torque at different top drive speeds. Furthermore, it corrects the initial threshold drilling pressure and initial threshold torque at the corresponding preset top drive speeds using the drill bit vibration parameters, ultimately determining the formation threshold drilling pressure and formation threshold torque. This solution offers advantages such as simple calculation method, more accurate results, effective guidance for drill bit and screw selection, improved mechanical drilling speed, and enhanced rock breaking efficiency.
[0035] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description
[0036] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:
[0037] Figure 1 This is a flowchart of the method for determining formation threshold drilling pressure and threshold torque provided by the present invention;
[0038] Figure 2 This is a schematic diagram of the structure of the device for determining formation threshold drilling pressure and threshold torque provided by the present invention;
[0039] Figure 3 This is a schematic diagram illustrating the relationship between mechanical drilling speed and drilling pressure provided by the present invention.
[0040] Explanation of reference numerals in the attached figures
[0041] 10 - Data acquisition module; 20 - Initial threshold drilling pressure determination module;
[0042] 30 - Initial threshold torque determination module; 40 - Correction module;
[0043] 50 - Result Output Module. Detailed Implementation
[0044] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the scope of the present invention.
[0045] The terms “first,” “second,” “third,” etc., are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0046] Furthermore, terms like "roughly" and "basically" are used to indicate that the content does not require absolute precision, but rather allows for a certain degree of deviation. For example, "roughly equal" does not simply mean absolute equality; in actual production and operation, achieving absolute "equality" is difficult, and a certain degree of deviation is generally present. Therefore, besides absolute equality, "roughly equal to" also includes the aforementioned situation where a certain degree of deviation exists. Using this as an example, in other cases, unless otherwise specified, terms like "roughly" and "basically" have similar meanings.
[0047] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.
[0048] Figure 1 This is a flowchart of the method for determining formation threshold drilling pressure and threshold torque provided by the present invention; Figure 2 This is a schematic diagram of the structure of the device for determining formation threshold drilling pressure and threshold torque provided by the present invention; Figure 3 This is a schematic diagram illustrating the relationship between mechanical drilling speed and drilling pressure provided by the present invention.
[0049] Example 1
[0050] like Figure 1 As shown, this embodiment provides a method for determining formation threshold drilling pressure and threshold torque, including:
[0051] Step 101: Obtain the mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different drilling pressure values within the preset drilling pressure range under different preset top drive speeds;
[0052] Step 102: For each preset top drive speed:
[0053] Based on the drilling pressure value at the preset top drive speed and the mechanical drilling speed corresponding to the drilling pressure value, the initial threshold drilling pressure at the preset top drive speed is determined from the drilling pressure value;
[0054] Based on the initial threshold drilling pressure at the preset top drive speed, the torque value corresponding to the preset top drive speed is determined as the initial threshold torque at the preset top drive speed.
[0055] Based on the drill bit vibration parameters at the preset top drive speed, the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed are corrected to obtain the corrected threshold drill pressure and corrected threshold torque.
[0056] Step 103: Use the modified threshold drilling pressure and modified threshold torque corresponding to different preset top drive speeds as the formation threshold drilling pressure and formation threshold torque.
[0057] Specifically, the rate of drilling (RBP) is an indicator reflecting the rock-breaking method used, the properties of the rock being drilled, and the drilling technology and conditions employed. It is expressed as the footage drilled per unit of pure drilling time, where pure drilling time refers to the time it takes for the drill bit to contact the bottom of the well, break the rock, and form the wellbore. During drilling, changing the pressure on the drill bit (PBD) at different preset top drive speeds will result in corresponding changes in the RBP, torque value, and drill bit vibration parameters. A higher PBD may generally lead to a higher RBP. Furthermore, the preset PBD range can be determined by the type of drill bit. By pre-determining different PBD values within this range and then adjusting the PBD to these values sequentially during drilling, the corresponding RBP at each PBD value can be determined. Based on this RBP, a threshold PBD can be determined. The threshold PBD can be understood as the minimum PBD value that can be set during drilling to ensure work efficiency.
[0058] In this embodiment, for a certain formation, multiple different preset top drive speeds are set. At a certain preset top drive speed, the mechanical drilling rate, torque value, and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range are obtained. Based on the drilling pressure value of the preset top drive speed and the mechanical drilling rate corresponding to the drilling pressure value, the initial threshold drilling pressure at the preset top drive speed is determined from the drilling pressure value. After determining the initial threshold drilling pressure at the preset top drive speed, the torque value related to the drilling pressure value corresponding to the threshold drilling pressure is directly determined as the initial threshold torque. However, since the initial threshold drilling pressure and initial threshold torque may not be applicable to the actual drilling process, it is necessary to correct the initial threshold drilling pressure and initial threshold torque corresponding to the preset top drive speed using the drill bit vibration parameters at the preset top drive speed to obtain the corrected threshold drilling pressure and corrected threshold torque, which are used as the formation threshold drilling pressure and formation threshold torque for this formation. For example: Set 10 different preset top drive speeds, and under each preset top drive speed, there are 5 different drill pressure values. Under the same preset top drive speed, there are 5 mechanical drilling speeds, 5 torque values, and 5 drill bit vibration parameters.
[0059] Furthermore, by adopting the above scheme, the formation threshold drilling pressure and formation threshold torque of all drilled formations can be obtained, thereby specifying the threshold drilling pressure and threshold torque diagram corresponding to the formations encountered throughout the wellbore. This provides guidance for subsequent drilling and can effectively guide the selection of drill bits and screws. That is, under a given displacement, the corresponding screw's stable working torque is greater than the threshold torque, and the recommended drilling pressure range for stable drilling of the drill bit is greater than the threshold drilling pressure but less than the optimal drilling pressure, so as to improve the mechanical drilling rate and rock breaking efficiency.
[0060] The drilling pressure and torque values can be collected by sensors, and the drill bit vibration parameters can be collected by measuring the sub. The specific collection method is common knowledge in this field and will not be described in detail here. The mechanical drilling rate can be calculated using the formula: Mechanical drilling rate = Drilling footage (meters) / Pure drilling time (hours), with the unit being meters per hour (m / h).
[0061] In another implementation, to ensure data accuracy, during the drilling process, a test location is first selected, such as a location with suitable formation thickness, low risk of downhole complexity, and minimal changes in drilling fluid properties and flow rate parameters. In addition, during the drilling process, an experienced driller or an intelligent driller is used to ensure uniform drilling.
[0062] Furthermore, the difference between adjacent drilling pressure values within the preset drilling pressure range is equal.
[0063] Specifically, in order to ensure the accuracy of the data and obtain accurate threshold drilling pressure and threshold torque, when determining different drilling pressure values within the preset drilling pressure range, the difference between adjacent drilling pressure values is the same, that is, the drilling pressure values change according to an arithmetic sequence.
[0064] Further, based on the drill pressure value at the preset top drive speed and the mechanical drilling rate corresponding to the drill pressure value, the initial threshold drill pressure at the preset top drive speed is determined from the drill pressure value, including:
[0065] Sort the drill pressure values in ascending order of their change.
[0066] Compare the mechanical drilling rates corresponding to every two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure.
[0067] Specifically, when obtaining the mechanical drilling speed, it can be obtained by following the drilling pressure values from maximum to minimum, or by proceeding from minimum to maximum. In this embodiment, firstly, the drilling pressure values are sorted in ascending order. As the drilling pressure increases, the mechanical drilling speed increases or decreases accordingly (usually increasing first and then decreasing). However, the magnitude of the increase or decrease varies. Therefore, when the drilling pressure increases, the corresponding increase in mechanical drilling speed is small, indicating that the mechanical efficiency is low at this drilling pressure value, resulting in a low mechanical drilling speed. When the drilling pressure increases to a certain value, the magnitude of the change in mechanical drilling speed increases significantly. Therefore, this value can be determined as the initial threshold drilling pressure. In practical applications, the actual drilling pressure value needs to be limited to a certain value above the initial threshold drilling pressure to increase the useful work of the machinery and improve work efficiency. In this embodiment, since adjacent drill pressure values exhibit the same variation pattern, the initial threshold drill pressure is located within the range where the difference in mechanical drilling rate between two adjacent drill pressure values is greatest. Because the drill pressure values are ordered from smallest to largest, the smaller of the two drill pressure values is determined as the initial threshold drill pressure. During actual drilling, the actual drill pressure value is ensured to be greater than the determined initial threshold drill pressure to improve mechanical efficiency during drilling. (Similarly, the smaller of the two drill pressure values with the largest positive slope, calculated by the line segment formed between the two drill pressure values, can be determined as the threshold drill pressure.)
[0068] In another implementation, the drilling pressure values can be sorted in descending order; the two drilling pressure values with the largest difference between their corresponding mechanical drilling rates are determined; and the smaller of the two drilling pressure values is determined as the initial threshold drilling pressure. During actual drilling, the actual drilling pressure value is ensured to be greater than the determined initial threshold drilling pressure to improve mechanical efficiency during drilling. (Similarly, the slope of the line segment formed between two drilling pressure values can be calculated, and the smaller of the two drilling pressure values with the largest negative slope is determined as the initial threshold drilling pressure.)
[0069] Furthermore, based on the drill bit vibration parameters at the preset top drive speed, the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed are corrected to obtain the corrected threshold drill pressure and corrected threshold torque, including:
[0070] If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed meet the preset rules, then the initial threshold drilling pressure and initial threshold torque of the preset top drive speed are retained.
[0071] If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed do not meet the preset rules, then delete the initial threshold drilling pressure and initial threshold torque of the preset top drive speed.
[0072] Furthermore, the drill bit vibration parameters include: lateral vibration acceleration, axial vibration acceleration, and torsional vibration value;
[0073] The preset rules include:
[0074] The lateral vibration acceleration does not exceed the first preset threshold, or the axial vibration acceleration does not exceed the second preset threshold, or the torsional vibration value does not exceed the third preset threshold.
[0075] Specifically, after obtaining the initial threshold drill pressure and initial threshold torque at each preset top drive speed, it is necessary to verify the initial threshold drill pressure and initial threshold torque. Therefore, in this embodiment, the lateral vibration acceleration, axial vibration acceleration, and torsional vibration values of the drill bit are used for verification. First, for the initial threshold drill pressure and initial threshold torque at a certain preset top drive speed, the drill bit vibration parameters (lateral vibration acceleration, axial vibration acceleration, and torsional vibration values) related to the drill pressure value corresponding to the initial threshold drill pressure are determined. If the lateral vibration acceleration does not exceed the first preset threshold, or the axial vibration acceleration does not exceed the second preset threshold, the verification is performed. If the preset threshold, or the torsional vibration value, does not exceed the third preset threshold, it indicates that the initial threshold drill pressure and initial threshold torque at the preset top drive speed are relatively accurate and can be used in actual drilling. The initial threshold drill pressure and initial threshold torque at this preset top drive speed are retained. If the lateral vibration acceleration exceeds the first preset threshold, the axial vibration acceleration exceeds the second preset threshold, and the torsional vibration value exceeds the third preset threshold, it indicates that the drill bit vibration is large at the initial threshold drill pressure and initial threshold torque at the preset top drive speed, resulting in low slewing efficiency and potential equipment damage. This is considered an unfavorable operating condition and cannot be used in actual drilling. The torsional vibration value is the ratio of the difference between the maximum and minimum rotational speeds to the average rotational speed.
[0076] More specifically, in this embodiment, the preset rules include: the lateral vibration acceleration does not exceed a first preset threshold, or the axial vibration acceleration does not exceed a second preset threshold, or the torsional vibration value does not exceed a third preset threshold. That is, when the lateral vibration acceleration, axial vibration acceleration, and torsional vibration value all exceed the corresponding thresholds, the preset rules are not satisfied. If any one of the lateral vibration acceleration, axial vibration acceleration, and torsional vibration value does not exceed the corresponding threshold, then the preset rules are satisfied.
[0077] Example 2
[0078] like Figure 2 As shown, this embodiment provides a device for determining formation threshold drilling pressure and threshold torque, including:
[0079] Data acquisition module 10 is used to acquire mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range under different preset top drive speeds;
[0080] The initial threshold drilling pressure determination module 20 is used to determine the initial threshold drilling pressure at the corresponding preset top drive speed based on the drilling pressure value of the corresponding preset top drive speed and the mechanical drilling speed corresponding to the drilling pressure value.
[0081] The initial threshold torque determination module 30 is used to determine the torque value at the corresponding preset top drive speed as the initial threshold torque at the corresponding preset top drive speed based on the initial threshold drilling pressure at the corresponding preset top drive speed.
[0082] The correction module 40 is used to correct the initial threshold drilling pressure and initial threshold torque corresponding to the corresponding preset top drive speed based on the drill bit vibration parameters at the corresponding preset top drive speed, so as to obtain the corrected threshold drilling pressure and corrected threshold torque.
[0083] The result output module 50 is used to take the modified threshold drilling pressure and modified threshold torque corresponding to different preset top drive speeds as the formation threshold drilling pressure and formation threshold torque.
[0084] Furthermore, the difference between adjacent drilling pressure values within the preset drilling pressure range is equal.
[0085] Furthermore, the initial threshold drilling pressure determination module 20 is specifically used for:
[0086] Sort the drill pressure values in ascending order of their change.
[0087] Compare the mechanical drilling rates corresponding to every two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure.
[0088] Example 3
[0089] This embodiment provides an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the above-described method for determining formation threshold drilling pressure and threshold torque.
[0090] Example 4
[0091] This embodiment provides a machine-readable storage medium storing instructions that cause a machine to execute the method for determining formation threshold drilling pressure and threshold torque described above.
[0092] Example 5
[0093] like Figure 3As shown in this embodiment: a 215.9mm PDC drill bit is used, with a commonly used drilling pressure of approximately 80–160 kN. During testing, the drilling pressure is set to its maximum value (180 kN), which is approximately 120% of the upper limit of the commonly used drilling pressure. Drilling is performed for 3–5 minutes, and the corresponding mechanical drilling speed and ground torque are recorded. Starting from the maximum drilling pressure (180 kN), while maintaining constant hydraulic parameters and ground rotation speed, the drilling pressure is reduced by 10 kN each time, with each test drilling lasting 3–5 minutes, and the mechanical drilling speed and ground torque are recorded. This process is repeated until the minimum drilling pressure (80 kN) is reached, obtaining the corresponding mechanical drilling speeds for different drilling pressure values between 80 and 160 kN. A diagram showing the relationship between mechanical drilling speed and drilling pressure is plotted with mechanical drilling speed on the ordinate and drilling pressure on the abscissa, as shown below. Figure 3 As shown, when the drill pressure (DPP) gradually increases from its minimum value, the position where the curve curvature changes the most (the mechanical drilling rate increases the most with the same increase in DPP) is, in this embodiment, when the DPP is between 140kN and 150kN, the corresponding difference in mechanical drilling rate is the largest (the slope is positive and the slope is the largest), thus 140kN is determined as the threshold DPP for rock breaking. Furthermore, when the DPP is further increased to a certain value (170kN), the mechanical drilling rate begins to decrease (the corresponding slope is negative), and at this point, 170kN is the optimal DPP.
[0094] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above embodiments. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention.
[0095] It should also be noted that the various specific technical features described in the above embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not describe the various possible combinations separately.
[0096] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.
[0097] Furthermore, various different implementations of the present invention can be combined arbitrarily, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed in the present invention.
Claims
1. A method for determining formation threshold drilling pressure and threshold torque, characterized in that, include: Under different preset top drive speeds, the mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range are obtained, wherein the difference between adjacent drilling pressure values within the preset drilling pressure range is equal; For each preset top drive speed: Based on the drill pressure value at the preset top drive speed and the corresponding mechanical drilling rate, the initial threshold drill pressure at the preset top drive speed is determined from the drill pressure value, including: Sort the drill pressure values in ascending order of their change. Compare the mechanical drilling rate corresponding to each two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure; Based on the initial threshold drilling pressure at the preset top drive speed, the torque value corresponding to the preset top drive speed is determined as the initial threshold torque at the preset top drive speed. Based on the drill bit vibration parameters at the preset top drive speed, the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed are corrected to obtain the corrected threshold drill pressure and corrected threshold torque, including: If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed meet the preset rules, then the initial threshold drilling pressure and initial threshold torque of the preset top drive speed are retained. If the drill bit vibration parameters corresponding to the initial threshold drilling pressure of the preset top drive speed do not meet the preset rules, then delete the initial threshold drilling pressure and initial threshold torque of the preset top drive speed. The modified threshold drilling pressure and modified threshold torque corresponding to different preset top drive speeds are used as the formation threshold drilling pressure and formation threshold torque; The drill bit vibration parameters include: lateral vibration acceleration, axial vibration acceleration, and torsional vibration value; The preset rules include: the lateral vibration acceleration does not exceed a first preset threshold, or the axial vibration acceleration does not exceed a second preset threshold, or the torsional vibration value does not exceed a third preset threshold.
2. A device for determining formation threshold drilling pressure and threshold torque, characterized in that, include: The data acquisition module is used to acquire the mechanical drilling speed, torque value and drill bit vibration parameters corresponding to different drilling pressure values within a preset drilling pressure range under different preset top drive speeds, wherein the difference between adjacent drilling pressure values within the preset drilling pressure range is equal. An initial threshold drilling pressure determination module is used to determine the initial threshold drilling pressure at the corresponding preset top drive speed based on the drilling pressure value at the corresponding preset top drive speed and the mechanical drilling speed corresponding to the drilling pressure value, including: Sort the drill pressure values in ascending order of their change. Compare the mechanical drilling rate corresponding to each two adjacent drilling pressure values, determine the drilling pressure value corresponding to the mechanical drilling rate with the largest difference, and determine the smaller of the two determined drilling pressure values as the initial threshold drilling pressure; The initial threshold torque determination module is used to determine the torque value at the corresponding preset top drive speed as the initial threshold torque at the corresponding preset top drive speed based on the initial threshold drilling pressure at the corresponding preset top drive speed. The correction module is used to correct the initial threshold drill pressure and initial threshold torque corresponding to the preset top drive speed based on the drill bit vibration parameters at the corresponding preset top drive speed, to obtain the corrected threshold drill pressure and corrected threshold torque, including: If the drill bit vibration parameters corresponding to the initial threshold drill pressure of the preset top drive speed meet the preset rules, then the initial threshold drill pressure and initial threshold torque of the preset top drive speed are retained. If the drill bit vibration parameters corresponding to the initial threshold drill pressure of the preset top drive speed do not meet the preset rules, then delete the initial threshold drill pressure and initial threshold torque of the preset top drive speed. The result output module is used to take the corrected threshold drilling pressure and corrected threshold torque corresponding to different preset top drive speeds as the formation threshold drilling pressure and formation threshold torque. The drill bit vibration parameters include: lateral vibration acceleration, axial vibration acceleration, and torsional vibration value; The preset rules include: the lateral vibration acceleration does not exceed a first preset threshold, or the axial vibration acceleration does not exceed a second preset threshold, or the torsional vibration value does not exceed a third preset threshold.
3. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the method for determining the formation threshold drilling pressure and threshold torque as described in claim 1.
4. A machine-readable storage medium storing instructions for causing a machine to perform the method for determining formation threshold drilling pressure and threshold torque as described in claim 1.