A coal bed gas downhole drilling construction parameter optimization method and system

Abstract

The present application relates to the technical field of automatic control drilling parameters, in particular to a coal seam gas downhole drilling construction parameter optimization method and system, comprising the following steps: obtaining acoustic response signals and calculating propagation characteristics, aligning drilling pressure data and identifying abnormal fluctuations, extracting pump pressure information and analyzing change trends, comparing the consistency of control points and organizing control actions, and finally forming a coal seam gas drilling parameter optimization control process. In the present application, by constructing an acoustic wave propagation delay sequence and synchronizing the drilling pressure response, the accurate calibration of abnormal states is realized, the key control segments are identified in combination with the pump pressure change trend, the time sequence coupling relationship between the drilling pressure and the pump pressure is established, the control action combination satisfying the response consistency is extracted and sequentially organized, the control instruction set with continuity and pertinence is formed, the collaborative identification and linkage control of the change trend of multiple parameters are realized, and the stability and response coordination in the construction process are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automatic control of drilling parameters, in particular to a coal seam gas downhole drilling construction parameter optimization method and system. BACKGROUND

[0002] The technical field of automatic control of drilling parameters involves real-time monitoring, dynamic analysis and automatic adjustment of various parameters during the construction process in drilling engineering to improve drilling efficiency and construction safety. The core matters of this technical field include drilling pressure control, rotation speed adjustment, flushing fluid flow management, drill bit torque monitoring, well deviation correction and formation feedback response, etc. It is widely used in downhole engineering operations such as oil and gas drilling, coal seam gas exploitation, shale gas exploration, etc. Automatic control of drilling parameters integrates sensor acquisition systems, control strategy algorithms and data response mechanisms, so that drilling equipment can adjust operating parameters according to real-time working conditions in a variable geological environment, thus meeting the drilling needs of different well sections. It has the characteristics of high integration, intelligence and self-adaptability, covering control principle design, parameter setting method, feedback control logic and multivariable control technology, etc. Among them, the traditional coal seam gas downhole drilling construction parameter optimization method refers to a type of operation mode in which drilling parameters such as drilling pressure, rotation speed, pump pressure and drilling fluid discharge are manually set or optimized after analysis in order to improve drilling efficiency and construction safety during coal seam gas drilling. The traditional method usually relies on manual adjustment of drilling parameters according to formation properties and historical construction experience, or makes post-mortem summary and optimization suggestions by recording and analyzing data curves after drilling is completed. This method often uses means such as field condition observation, segmented parameter recording, experience comparison table comparison, historical case analogy, etc.

[0003] The prior art sets drilling parameters by observing field conditions and historical experience, lacks the ability to finely capture real-time formation response signals, and cannot form a dynamic alignment mechanism between data. The parameter adjustment process cannot effectively reflect the linkage between drilling pressure and pump pressure, and there are problems of control separation and response lag. When abnormal fluctuations occur during drilling, it is difficult for manual judgment to identify and control key points in time, resulting in one-sidedness and lag in parameter setting. The control action cannot form a continuous logical chain, the coordination between different parameters is weakened, and the construction rhythm and operation stability are affected. SUMMARY

[0004] In order to achieve the above purpose, the present application provides a coal seam gas downhole drilling construction parameter optimization method and system; wherein:

[0005] A coal seam gas downhole drilling construction parameter optimization method, comprising the following steps:

[0006] S1: Acquire the acoustic wave response signal installed below the drill bit, based on the preset multi-point layout and excitation result, extract the reflection signal arrival time and calculate the propagation time delay, and the echo amplitude change value, generate the acoustic wave propagation delay sequence in time sequence;

[0007] S2: Collect the WOB data stream corresponding to the acoustic wave propagation delay sequence, align and compare the change gradient and peak interval of the WOB data stream and the acoustic wave propagation delay sequence in the same time period, identify the fluctuation mode of the acoustic wave parameter deviating from the preset reference range, and output the WOB change trajectory;

[0008] S3: Mark the time segment with rising slope exceeding threshold value in the WOB change trajectory, extract the pump pressure sampling record in the time segment, analyze the synchronization of the pump pressure sampling record and the WOB change trajectory, and generate the pump pressure change trend;

[0009] S4: Compare the WOB change trajectory and the pump pressure change trend in response delay, amplitude change direction and change duration, extract the control action combination meeting the linkage execution condition, and construct the construction control action sequence;

[0010] S5: Based on the construction control action sequence, extract the control instruction content including WOB adjustment action and pump pressure adjustment action, activate the control component of the drilling platform, drive the hardware response process, and form the coalbed methane downhole drilling construction parameter optimization control process.

[0011] As a further scheme of the present application, the acoustic wave propagation delay sequence includes propagation time difference, echo amplitude change value and time sequence index, the WOB change trajectory includes change gradient feature, peak interval feature and trend coupling parameter, the pump pressure change trend includes numerical rise and fall amplitude, synchronization index and time period label, the construction control action sequence includes response delay parameter, amplitude change direction identifier and change duration, and the coalbed methane downhole drilling construction parameter optimization control process includes WOB adjustment instruction, pump pressure adjustment instruction and control component activation parameter.

[0012] As a further scheme of the present application, the abnormal acoustic wave corresponds to the WOB fluctuation mode in the WOB change curve, which appears gradient increase and peak interval abnormal shortening in the time period corresponding to the acoustic wave propagation delay sequence.

[0013] As a further scheme of the present application, the linkage execution condition refers to the conditions that the response delay of the WOB control point and the pump pressure control point does not exceed the preset threshold value, the amplitude change direction is consistent, and the change is continuous.

[0014] As a further scheme of the present application, the specific steps of S1 are:

[0015] S101: Acquire the acoustic wave response signal installed below the drill bit, extract the receiving timestamp of the signal package, calculate the time difference of adjacent sampling points, and generate a propagation time difference sequence;

[0016] S102: Call the propagation time difference sequence, extract the signal intensity value in the signal package, calculate the intensity difference value between adjacent sampling points, sequentially record the amplitude change of the node, and generate an echo amplitude change value sequence;

[0017] S103: According to the index order of the propagation time difference sequence and the echo amplitude change value sequence, splice, arrange the time sequence of the node, and generate an acoustic wave propagation delay sequence.

[0018] As a further scheme of the present application, the specific steps of S2 are:

[0019] S201: Collect the drilling pressure data stream corresponding to the time axis of the acoustic wave propagation delay sequence, and extract the drilling pressure value of each time node. According to the time axis, compare the time stamps of the two groups of data, perform synchronization processing operation point by point, and establish a time-aligned drilling pressure sequence;

[0020] S202: Call the time-aligned drilling pressure sequence and the acoustic wave propagation delay sequence, respectively calculate the change gradient value and the interval parameter between adjacent peak values in the same time period, compare the synchronization of the two groups of parameter curves, extract the abnormal offset feature points, and obtain the drilling pressure fluctuation corresponding feature;

[0021] S203: According to the drilling pressure fluctuation corresponding feature, collect the corresponding relationship between the acoustic wave change trend and the drilling pressure change direction, perform point-by-point comparison of the change direction of the acoustic wave delay value and the drilling pressure value in the same time period, judge the consistency of the change trend, and perform sequence splicing and trajectory mapping on the coupling matching interval, to generate a drilling pressure change trajectory.

[0022] As a further scheme of the present application, the specific steps of S3 are:

[0023] S301: Calculate the drilling pressure change slope of adjacent time nodes in the drilling pressure change trajectory, and compare the slope value with the preset slope threshold value. Select the continuous time nodes whose slope value exceeds the slope threshold value, and mark and time aggregate to obtain a high-slope drilling pressure time segment;

[0024] S302: According to the time range of the high-slope drilling pressure time segment, collect the pump pressure sampling record in the corresponding time axis, and perform difference calculation of adjacent sampling points on the pump pressure value to form a pump pressure rising and falling direction sequence. At the same time, perform synchronization sequence alignment on the drilling pressure value to obtain a pump pressure drilling pressure synchronization sequence;

[0025] S303: Call the pump pressure and drilling pressure synchronization sequence, judge the consistency of the rising and falling direction of the pump pressure value in the continuous time node, and arrange and sequence code the nodes that meet the continuous change condition in time sequence to generate the pump pressure change trend.

[0026] As a further scheme of the present application, the specific steps of S4 are:

[0027] S401: According to the control point information marked in the drilling pressure change trajectory and the pump pressure change trend respectively, extract the response start time of each pair of control points, compare the time difference and compare it with the preset response delay threshold, select the control point pairs that meet the delay consistency condition, and obtain the synchronous response control point set;

[0028] S402: Call the amplitude change direction of drilling pressure and pump pressure in the synchronous response control point set, compare the change sign characteristics of the same control point, and judge by combining the time interval difference and the change duration threshold, select the point pairs that match the amplitude direction and time length, and generate the linkage execution control combination;

[0029] S403: According to the start time of the control action in the linkage execution control combination, sort all control actions in ascending order, and establish the construction control action sequence.

[0030] As a further scheme of the present application, the specific steps of S5 are:

[0031] S501: Based on the sorted control items in the construction control action sequence, extract the control type, adjustment target and adjustment amplitude corresponding to each control action in turn, and classify and record the actions belonging to the drilling pressure control class and the pump pressure control class respectively, and establish the control instruction parameter set;

[0032] S502: Call the drilling pressure adjustment action and the pump pressure adjustment action in the control instruction parameter set, retrieve the corresponding control component identifier in the drilling platform, align the control action with the corresponding hardware instruction through the instruction mapping rule, and complete the component activation configuration, and generate the control component call list;

[0033] S503: According to the control instruction sequence in the control component call list and the associated hardware response logic, perform continuous control link activation operation, construct the closed loop relationship of drilling pressure and pump pressure adjustment in time sequence chain, and establish the coalbed methane downhole drilling construction parameter optimization control process.

[0034] A coalbed methane downhole drilling construction parameter optimization system, comprising:

[0035] The sound wave signal processing module is configured to realize S1: obtaining a sound wave response signal installed below a drill bit, extracting a reflection signal arrival time and calculating a propagation time delay, and a back echo amplitude change value based on a preset multi-point arrangement and excitation result, and generating a sound wave propagation delay sequence in time sequence;

[0036] The drilling pressure fluctuation identification module is configured to realize S2: collecting a drilling pressure data stream corresponding to the sound wave propagation delay sequence, aligning and comparing a change gradient and a peak value interval of the drilling pressure data stream and the sound wave propagation delay sequence in the same time period, identifying a fluctuation mode of the sound wave parameter deviating from a preset reference range, and outputting a drilling pressure change trajectory;

[0037] The pump pressure synchronous analysis module is configured to realize S3: marking a time segment with an upward slope exceeding a threshold in the drilling pressure change trajectory, extracting a pump pressure sampling record in the time segment, analyzing a synchronous relationship between an ascending and descending trend of the pump pressure sampling record and the drilling pressure change trajectory, and generating a pump pressure change trend;

[0038] The linkage control extraction module is configured to realize S4: comparing the drilling pressure change trajectory and the pump pressure change trend in response delay, amplitude direction and change duration, extracting a control action combination meeting a linkage execution condition, and constructing a construction control action sequence;

[0039] The intelligent control execution module is configured to realize S5: based on the construction control action sequence, extracting a control instruction content including a drilling pressure adjustment action and a pump pressure adjustment action, activating a control component of a drilling platform, driving a hardware response process, and forming a coalbed methane downhole drilling construction parameter optimization control flow.

[0040] Compared with the prior art, the present application has the following advantages and positive effects:

[0041] In the present application, by constructing a sound wave propagation delay sequence and synchronizing a drilling pressure response, accurate calibration of an abnormal state is realized, a key control segment is identified in combination with a pump pressure change trend, a time sequence coupling relationship between drilling pressure and pump pressure is established, a control action combination meeting response consistency is extracted and sequentially organized, a control instruction set with continuity and pertinence is formed, collaborative identification and linkage control of multi-parameter change trends are realized, and stability and response coordination in a construction process are improved. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.Figure 1 A flow chart of the steps of the present application;

[0044] Figure 2 A detailed schematic diagram of S1 of the present application;

[0045] Figure 3 A detailed schematic diagram of S2 of the present application;

[0046] Figure 4 A detailed schematic diagram of S3 of the present application;

[0047] Figure 5 A detailed schematic diagram of S4 of the present application;

[0048] Figure 6 A detailed schematic diagram of S5 of the present application;

[0049] Figure 7 A system block diagram of the present application. DETAILED DESCRIPTION

[0050] The technical solutions in the present application will be described below with reference to the drawings.

[0051] In the embodiments of the present application, the words such as "example", "for example" and the like are used to represent as an example, illustration or description. Any embodiment or design scheme described as "example" in the present application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. Rather, the word "example" is intended to present the concept in a specific manner. In addition, in the embodiments of the present application, the meaning expressed by "and / or" can be both, or can be one of the two.

[0052] In the embodiments of the present application, "image" and "picture" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized. "Of", "corresponding" and "corresponding" can be used interchangeably at times, and it should be pointed out that the meanings expressed are consistent when the distinction is not emphasized.

[0053] In the embodiments of the present application, sometimes the subscript such as W1 can be written in the form of non-subscript such as W1, and the meanings expressed are consistent when the distinction is not emphasized.

[0054] To make the technical problems, technical solutions and advantages to be solved by the present application clearer, specific embodiments will be described in detail below with reference to the drawings.

[0055] Please refer to Figure 1 The embodiment of the present application provides a coal bed methane downhole drilling construction parameter optimization method, which comprises the following steps:

[0056] S1: Acquire the acoustic wave response signal installed below the drill bit, calculate the propagation time difference and echo amplitude change value between adjacent sampling points according to the arrival time and reflection intensity characteristics in the acoustic wave propagation process, arrange all the results in time sequence, and generate the acoustic wave propagation delay sequence;

[0057] S2: Collect the WOB data stream corresponding to the acoustic wave propagation delay sequence, perform point-by-point synchronization alignment processing, and compare the change gradient and peak interval characteristics of the two groups of data in the same time period to identify the WOB fluctuation mode corresponding to the acoustic wave anomaly, and output the WOB change trajectory through the bidirectional trend coupling mode;

[0058] S3: Mark the time segments in the WOB change trajectory where the rising slope exceeds the preset slope threshold, and extract the pump pressure sampling records in the same time range, analyze the continuous rising and falling trend of the pump pressure value and the synchronization characteristics of the WOB, and generate the pump pressure change trend in time sequence;

[0059] S4: According to the control point information marked in the WOB change trajectory and the pump pressure change trend, compare the consistency of the response delay, amplitude change direction and change duration, extract the control action combination that meets the linkage execution condition, and construct the construction control action sequence according to the control sequence;

[0060] S5: Based on the construction control action sequence, extract the control instruction content including the WOB adjustment action and the pump pressure adjustment action, activate the control components in the drilling operation platform, drive the hardware response process through the continuous control logic, and form the coalbed methane downhole drilling construction parameter optimization control process.

[0061] The acoustic wave propagation delay sequence includes the propagation time difference, echo amplitude change value and time sequence index, the WOB change trajectory includes the change gradient characteristics, peak interval characteristics and trend coupling parameters, the pump pressure change trend includes the numerical rising and falling amplitude, synchronization index and time period label, the construction control action sequence includes the response delay parameter, amplitude change direction identifier and change duration, and the coalbed methane downhole drilling construction parameter optimization control process includes the WOB adjustment instruction, pump pressure adjustment instruction and control component activation parameter.

[0062] Please refer to Figure 2 , the specific steps of S1 are:

[0063] S101: Acquire the acoustic wave response signal installed below the drill bit, extract the receiving time stamp of the signal packet, calculate the time difference of adjacent sampling points, and generate the propagation time difference sequence;

[0064] A plurality of high-sensitivity acoustic wave sensors are arranged directly below the drill bit, each sensor is installed on an axis perpendicular to the drill bit at equal intervals, ensuring real-time acquisition of acoustic wave information generated by the interaction between the drill bit and the formation during drilling. Each sensor needs to be packaged with high temperature and high pressure resistance to adapt to the complex environment underground. After the sensor receives the acoustic wave signal, it is amplified and filtered by the signal conditioning module, and then enters the data acquisition device for sampling. A unified time reference is set for sampling, and each sensor records the receiving time at the moment of collecting the acoustic wave packet, forming a signal packet sequence with a time label. In actual operation, for example, 2000 samples per second are set, and the receiving time stamp of multiple acoustic wave signals can be recorded during continuous drilling of the drill bit. By extracting the signal peak point with significant reflection characteristics and combining the corresponding formation depth or trigger time information, the propagation time delay of each reflection signal is calculated to form a propagation time delay sequence. In this process, the constant value of the time interval generated only by the sampling period should be excluded to avoid mistaking the sampling jitter as a change in acoustic wave propagation. The calculated time difference is recorded as a separate array, which is the propagation time difference sequence. To ensure its accuracy, abnormal values with a time difference less than the minimum resolution or much higher than the reasonable propagation delay should be removed during processing. For example, if the time difference between two signals is less than 0.0001 seconds or more than 0.01 seconds, it is considered to be a non-real and effective signal. Normal data is stored in the buffer in turn and is identified with real-time drill bit position information for further analysis of the propagation path change trend in subsequent steps, and finally a propagation time difference sequence with complete structure and time accuracy meeting processing requirements is obtained.

[0065] S102: Call the propagation time difference sequence, extract the signal intensity value in the signal packet, calculate the intensity difference value between adjacent sampling points, record the amplitude change of the node in turn, and generate an echo amplitude change value sequence;

[0066] By reading the signal intensity data in the sound wave signal packet corresponding to each time difference value, the intensity value is the maximum voltage response or average effective value of the sound wave signal received by the sensor at a certain time, the signal intensity is extracted by performing shaping and normalization processing on the original signal waveform, removing abnormal peak values caused by electromagnetic interference or environmental fluctuations, then extracting the valid data points in each signal packet at equal intervals, selecting the maximum amplitude point as the representative intensity value of the packet, after obtaining the entire intensity value sequence, the intensity values of two adjacent signal packets are processed by difference, that is, the intensity of the latter signal packet is subtracted from the intensity of the former signal packet and the absolute value is taken, and the above operation is performed on each pair of signal packets in the entire sequence to obtain the amplitude change value, in actual operation, for example, in a certain drilling task, the amplitude values of two adjacent sampling points are 1.8 volts and 2.1 volts respectively, and the difference is 0.3 volts, if the difference is less than the set minimum change threshold, such as 0.05 volts, it is not counted as valid data, otherwise it is recorded as an amplitude change in the amplitude change value sequence, and the original propagation time difference index information is attached to maintain data source consistency, numbered according to the sequence of time series to form a complete echo amplitude change value sequence, which will be used in subsequent steps for time delay analysis.

[0067] S103: According to the index order of the propagation time difference sequence and the echo amplitude change value sequence, splice the time sequence of the node, and generate the sound wave propagation delay sequence;

[0068] First, check the index numbers of the two sequences one by one, confirm that each time difference value has a corresponding amplitude change value, and the sequence numbers are consistent and there is no loss, ensure that the data is logically consistent, then according to the order of each item in the time difference sequence, record the corresponding amplitude change value in order, each combined data includes a time difference and an amplitude change, for example, in the 10th index number, the time difference is 0.002 seconds and the amplitude change is 0.35 volts, then combined as data point (0.002 seconds, 0.35 volts), so the entire data is traversed and combined, and a complete node time sequence is obtained, in this process, a verification mechanism is set to judge the validity of the time difference value and the amplitude change value in all spliced data, for example, if the time difference value of a data point is lower than the minimum processing threshold, such as 0.0001 seconds, or the amplitude change is lower than 0.05 volts, the data point is removed, to avoid invalid or abnormal data affecting the final analysis accuracy, all valid data points are arranged in ascending order of time difference value, renumbered, and a new sound wave propagation delay sequence is formed, which has a clear time sequence and corresponding reflection intensity characteristics, providing structured time domain input data for the response of the drill bit to the formation medium at different drilling depths.

[0069] Please refer to Figure 3 , the specific steps of S2 are:

[0070] S201: Collect the drill pressure data stream corresponding to the time axis of the acoustic propagation delay sequence, extract the drill pressure value at each time node, compare the timestamps of the two sets of data according to the time axis, perform synchronization processing operation point by point, and establish a time-aligned drill pressure sequence;

[0071] First, drilling pressure data is acquired in real time using a drilling pressure sensor mounted on the drill string. This sensor continuously outputs instantaneous values ​​reflecting the pressure exerted on the drill bit, in kN. The data output frequency is set to 1Hz, meaning one drilling pressure value is generated per second. A time synchronization module provides a unified clock source for both the drilling pressure acquisition module and the acoustic wave propagation sequence acquisition module. While acquiring the drilling pressure data stream, a corresponding timestamp is added to each drilling pressure value, recorded in "hours, minutes, seconds, milliseconds" format. Then, the time point information in the acoustic wave propagation delay sequence is extracted, and these time points are scanned one by one. The drilling pressure data stream is searched for the closest timestamp. If the time difference between the two does not exceed the set synchronization tolerance threshold, for example, 0.5 seconds, the two time points are considered to be successfully matched, and the drilling pressure value is used as the corresponding acoustic wave time segment. If the time difference between the synchronous drill pressure values ​​at a point exceeds a set threshold, the next time point is searched forward or backward in the drill pressure sequence, and it is determined whether its error meets the condition. If it does, the point is selected as the replacement; otherwise, it is considered data loss and no matching is performed. After completing point by point, the drill pressure values ​​corresponding to the successfully matched time points are rearranged according to the time order of the acoustic propagation delay sequence, and their original time error and sampling value information are recorded to form a time-aligned drill pressure sequence. For example, in a certain sampling segment, the time point of the acoustic sequence is 432.500 seconds, and the timestamp of the corresponding drill pressure data is 432.467 seconds, with an error of 0.033 seconds, which is less than the tolerance threshold, so the match is successful. Finally, a drill pressure data sequence that completely corresponds to the acoustic propagation delay sequence and has the same time axis is formed, which is used for subsequent joint feature analysis.

[0072] S202: Call the time-aligned drill pressure sequence and the acoustic propagation delay sequence, calculate the gradient value of change and the interval parameter between adjacent peaks within the same time period, compare the synchronicity of the two sets of parameter curves, extract abnormal offset feature points, and obtain the corresponding features of drill pressure fluctuation.

[0073] First, according to the time sequence of the two groups of data, a number of continuous data points in the same interval range are selected to form an analysis paragraph, for example, 50 data points in a 50-second time period are selected, each pair of adjacent data points in the WOB sequence and the acoustic delay sequence is processed, the change gradient value, that is, the difference between the numerical values of each pair of adjacent points and the ratio of the time interval, is calculated to construct the change rate sequence of the sequence, in the WOB sequence, if two points are 102 kN and 108 kN, the time interval is 1 second, then the gradient value is 6 kN / s, if the corresponding data in the acoustic sequence is 0.0017 s and 0.0020 s, then the gradient is 0.0003 s / s, in this way, the complete gradient sequence of each group of data is obtained, then the peak value is determined in each gradient sequence by detecting local maximum or minimum value points, the window method is used to determine whether the middle point is greater than the front and rear two points in every five data points to determine the local peak value, the time position and value of all peak values are recorded, the time interval between adjacent peak values is calculated to form the interval parameter sequence, for example, the WOB peak value interval is 12 seconds, the acoustic peak value interval is 13 seconds, the difference is 1 second, if the synchronization judgment threshold is set to 2 seconds, it is determined that the pair of interval parameters is synchronous, continue to compare other all peak value pairs in this way, and record the points that do not meet the synchronization condition, if the difference value of a group of interval parameters exceeds 2 seconds, for example, 5 seconds, the time point is regarded as an abnormal offset point, the WOB value and the acoustic delay value corresponding to the time point are extracted to form an abnormal feature point set, finally, the key point data of the asynchronization or mutation in the WOB fluctuation process is obtained as the corresponding feature of the WOB fluctuation.

[0074] S203: According to the WOB fluctuation corresponding feature, the corresponding relationship between the acoustic change trend and the WOB change direction is collected, the change direction of the acoustic delay value and the WOB value in the same time period is compared point by point, the consistency of the two in the change trend is judged, the coupling matching interval is sequentially spliced and the trajectory is mapped, and the WOB change trajectory is generated;

[0075] In the aligned WOB sequence and acoustic wave propagation delay sequence, select time intervals of equal length and perform trend direction analysis on the two sets of data respectively. Compare adjacent two data points. If the value of the latter point is greater than that of the former point, it is recorded as rising. If not, it is recorded as falling. If they are equal, it is recorded as stable. Form a trend direction sequence. For example, in the WOB sequence, three consecutive data points are 105 kN, 110 kN and 114 kN, which form two rising directions. In the acoustic wave sequence, the corresponding time period is 0.0019s, 0.0023s and 0.0026s, which also form rising directions. It is determined that there is a positive trend coupling. If the two directions are not consistent, for example, the WOB rises while the acoustic wave falls, it is determined that the trends are inconsistent. The entire data sequence is judged segment by segment according to this rule. In each continuous time period with consistent trends, the coupling interval is recorded and marked. The WOB and acoustic wave values at the start and end points of each coupling interval are intercepted to form a combined sequence. The continuous recorded data segment is constructed on the time axis in seconds. For example, from the 400th second to the 412th second, a coupling segment is formed, in which the WOB rises from 98 kN to 125 kN and the acoustic wave delay rises from 0.0015s to 0.0029s. The two sets of values together form a positive coupling segment. Then, the multiple coupling segments are connected in time sequence to form a continuous trajectory segment. The WOB value is taken as the vertical axis and the time as the horizontal axis to draw the trajectory line, forming a trajectory image reflecting the trend of WOB change. Finally, the structured WOB change trajectory is output.

[0076] Please refer to Figure 4 The specific steps of S3 are:

[0077] S301: Calculate the WOB change slope of adjacent time nodes in the WOB change trajectory point by point, and compare the slope value with the preset slope threshold value. Select the continuous time nodes with slope values exceeding the slope threshold value, and mark and time aggregate them to obtain the high-slope WOB time segment.

[0078] First, read the weight on bit value of all continuous time nodes in the weight on bit change trajectory and the corresponding time interval, for each two adjacent time nodes, using the weight on bit value of the latter node minus the weight on bit value of the former node and then dividing by the time interval value, the change slope value of the time period is obtained, the calculation is performed in seconds as the time unit, for example, the weight on bit of a node is 115 kN, the weight on bit of the latter node is 125 kN, and the time interval is 1 second, then the corresponding slope is 10 kN / s, the slope calculation operation is performed point by point on the whole trajectory in this way, and all the calculated slope values are combined to form a slope sequence, then the preset slope threshold value is called to compare with each slope value one by one, the slope threshold value is the critical index for setting the judgment of rapid change, the value is set according to the reference of the stable change range of the downhole conventional weight on bit, generally set as 8 kN / s, if a slope value is greater than or equal to the threshold value, it is judged as a high slope node, if it is less than the threshold value, it is ignored, the screening process is continuously judged according to the index order, every time a continuous three or more nodes that meet the condition of slope greater than or equal to the threshold value appear, it is judged as a continuous high slope section, and the start time index and the end time index are marked, for example, the slope values of six points from the 110th to the 115th second are 9, 10, 11, 13, 12 and 8 kN / s, which constitute an effective high slope segment, all the slope values in the time segment are aggregated and recorded, at the same time, the time range, the start and end weight on bit values and the average slope of the segment are saved as segment identification parameters, finally forming the high slope weight on bit time segment.

[0079] S302: According to the time range of the high slope weight on bit time segment, the pump pressure sampling record in the corresponding time axis is collected, and the difference value calculation of the pump pressure values of adjacent sampling points is performed, forming the pump pressure lifting direction sequence, at the same time, the weight on bit value is taken to perform synchronous sequence alignment, obtaining the pump pressure weight on bit synchronous sequence;

[0080] First, the time index value corresponding to the start and end point of the time segment is located, for example, the start point of a segment is 220 seconds, and the end point is 232 seconds, then the time range is taken as the index range, all pump pressure sampling points in the corresponding time period in the pump pressure data collection sequence are read, each point is the pump pressure value recorded once per second, the unit is MPa, the pump pressure values extracted in this range are arranged in chronological order to form a pump pressure sampling record sequence, then the difference between adjacent sampling points is calculated, for example, the pump pressure at 221 seconds is 12.4 MPa, and the pump pressure at 222 seconds is 13.1 MPa, the difference is 0.7 MPa, indicating an upward trend, if the latter value is less than the former value, it is a downward trend, and if the difference is equal to 0, it is a stable trend, a group of pump pressure rising and falling direction sequence is formed by comparing each pair, for example, the direction sequence obtained in a certain segment is "up, up, down, down, stable, up", which is recorded in the form of text mark, each direction corresponds to a specific starting time point and difference value, at the same time, the drilling pressure data in this time period is processed synchronously, the drilling pressure value completely consistent with the pump pressure sampling time in this segment is extracted to form a drilling pressure alignment sequence, for example, the pump pressure sampling is at 223 seconds, the drilling pressure value at 223 seconds is read from the original drilling pressure sequence and synchronized, if there is no corresponding item, the nearest value with a time error less than 0.5 seconds is searched and replaced, after completion, the pump pressure direction sequence and the drilling pressure sequence are arranged correspondingly to form a pump pressure drilling pressure synchronization sequence, each item of the sequence consists of pump pressure value, drilling pressure value and pump pressure rising and falling trend, which is used for subsequent trend consistency analysis.

[0081] S303: Call the pump pressure drilling pressure synchronization sequence, judge the rising and falling direction consistency of the pump pressure value in the continuous time node, and arrange and sequence code the nodes that meet the continuous change condition in chronological order to generate the pump pressure change trend;

[0082] The direction of the continuous time nodes in the pump pressure sequence is analyzed in sections. A judgment window of 3 seconds is set during the execution process, that is, whether the pump pressure rising and falling directions of the three consecutive data points are the same. If there are three consecutive "rising" or three consecutive "falling" marks, it is considered that the direction of this section is consistent. The window is slid backward from the starting position of the sequence during judgment, and the direction comparison is updated point by point to determine whether the condition is met. For example, if the direction sequence is "rising, rising, rising, stable, falling, falling, falling", it is divided into two consistent sections. After confirming the consistent direction, the time starting point and termination point of each section are extracted, and all nodes that meet the continuous change condition are arranged in time sequence. These nodes are renumbered in ascending order of time, and each section is assigned a unique serialized code identifier, such as "Section A", "Section B", etc. Each node in the section code is attached with its time index, pump pressure value, drilling pressure value and change direction identifier. Finally, all sections that meet the condition are combined to form a complete pump pressure change trend. The trend is output in text and numerical structure, reflecting the change direction, amplitude and persistence of the pump pressure in a specific time period.

[0083] Please refer to Figure 5 The specific steps of S4 are as follows:

[0084] S401: According to the drilling pressure change trajectory and the control point information marked in the pump pressure change trend, the response starting time of each pair of control points is extracted, the time difference is compared and compared with the preset response delay threshold, and the control point pairs that meet the delay consistency condition are screened to obtain the synchronous response control point set;

[0085] First, the time index set marked as the control point in the WOB trajectory and the corresponding control point index set in the pump pressure trend are extracted, each control point contains the time information of the start of the point change, the change amplitude of the corresponding value and the change direction, for example, a certain WOB control point record is the starting time 210 seconds, the change amplitude +18kN, the direction is rising, the pump pressure control point is the starting time 213 seconds, the change amplitude +2.4MPa, the direction is rising, each pair of WOB and pump pressure control points is compared, the starting time of each pair of combination is extracted first in the comparison step, the time difference Δt of the two is calculated, the difference is obtained by direct subtraction, for example, the starting times of the two are 210 seconds and 213 seconds respectively, then Δt=3 seconds, then the preset response delay threshold is called, the threshold is set according to the drilling equipment control feedback mechanism, generally 5 seconds, indicating that if the time difference between two control actions is less than or equal to 5 seconds, it is considered to have response synchronization characteristics, Δt is compared with the threshold during comparison, if Δt≤5 seconds, the point pair is retained, otherwise it is rejected, the judgment process is repeated in all control point combinations, after one round of comparison, all control points that meet the response delay consistency are uniformly collected, each point pair that meets the condition records the starting time, change direction and amplitude of WOB and pump pressure, which is used for subsequent linkage judgment processing, and finally the synchronous response control point set is obtained.

[0086] S402: The amplitude change direction of WOB and pump pressure in the synchronous response control point set is called, the change sign characteristics of the same control point are compared, and the time interval difference and change duration threshold are combined to judge, the point pairs that match the amplitude direction and duration are screened, and the linkage execution control combination is generated;

[0087] First, the change sign of each pair of synchronous control points is extracted, if the change direction of the two items is the same, it is recorded as the same sign, for example, the change of the drilling pressure is +18kN, and the change of the pump pressure is +2.1MPa, both are positive change, if one is positive and the other is negative, it is opposite, which is used as the basis to judge the matching of the change sign, the matching standard is consistent, that is, positive correlation, and inconsistent is not related, then the duration interval of each pair of control points is further extracted, that is, the interval time from the change start time to the change end time, for example, the duration of the drilling pressure change is 8 seconds, and the duration of the pump pressure change is 9 seconds, the time difference is 1 second, the set change duration threshold is called for comparison and judgment, the threshold represents the maximum acceptable range of the duration difference between the two, which is generally set to 3 seconds, if the duration difference between the two is within the threshold range, and the change direction sign is consistent, it is judged that the pair of control points meets the linkage control standard, the process is performed once for each pair of data in the synchronous control point set, all point pairs meeting the conditions are recorded, and the start time, drilling pressure change amplitude, pump pressure change amplitude, duration and direction type are marked, for example, a combination point record is start time 221 seconds, drilling pressure +22kN, pump pressure +3.0MPa, duration is 8 seconds and 9 seconds respectively, change direction is upward, time difference is 1 second, which meets the conditions, and is included in the linkage execution control combination.

[0088] S403: According to the start time of the control action in the linkage execution control combination, all control actions are sorted in ascending order to establish a construction control action sequence;

[0089] The start time values of the drilling pressure control action and the pump pressure control action are extracted from each combination, and these time points are uniformly converted into absolute second value index, then all control combinations are sorted in ascending order according to the start time, if the start times of two combinations are exactly the same, the pump pressure control action is arranged first and the drilling pressure control action is arranged second, an ascending queue is established to ensure that the control action execution has a clear logical structure, each record in the queue is accompanied by complete action identification information, including start time, control parameter change direction, change amplitude and duration, which is used to support the subsequent scheduling module, for example, if the first three action records in the queue are as follows: start time 205 seconds, pump pressure +1.8MPa, duration 5 seconds; start time 206 seconds, drilling pressure +15kN, duration 6 seconds; start time 211 seconds, pump pressure-2.5MPa, duration 7 seconds, an ascending control action sequence is formed, and finally a construction control action sequence covering the whole process is formed.

[0090] Please refer to Figure 6 , the specific steps of S5 are:

[0091] S501: Based on the sorted control items in the construction control action sequence, the control type, adjustment target and adjustment amplitude corresponding to each control action are extracted in turn, and the actions belonging to the drilling pressure control class and the pump pressure control class are classified and recorded respectively to establish the control instruction parameter set;

[0092] The control type is defined by the action label, which is divided into two categories: "drilling pressure adjustment" and "pump pressure adjustment". The adjustment target is the specified desired value or target operating state, and the adjustment amplitude is the numerical change amount of the current action compared to the previous state. For example, a control item record of "type: drilling pressure adjustment, target: 120kN, amplitude: +15kN" indicates that the control item intends to increase the drilling pressure by 15kN to reach the 120kN target based on the current basis. After reading all the sorted control items, the control type field is used for classification operation. All actions marked as drilling pressure adjustment are extracted and arranged in chronological order as a group, and all actions marked as pump pressure adjustment are extracted and stored independently as another group. In the classification process, each control item is assigned a unique number to identify its category, time index and parameter value, which facilitates subsequent device deployment and instruction distribution. In addition, to avoid conflicts caused by overlapping control actions, the time interval between adjacent control actions is detected during classification. If the interval between adjacent actions is less than the set minimum control interval threshold (e.g. 3 seconds), it is marked as an overlapping item that needs to be adjusted and is temporarily suspended for execution when establishing the final control parameter set. Finally, a control instruction parameter set consisting of two independent subsets is generated, each subset containing three structured parameter records of control type, adjustment target and adjustment amplitude in chronological order.

[0093] S502: Call the drilling pressure adjustment action and pump pressure adjustment action in the control instruction parameter set, retrieve the corresponding control component identifier in the drilling platform, align the control action with the corresponding hardware instruction through the instruction mapping rule, and complete the component activation configuration to generate a control component call list;

[0094] Each instruction record is traversed in turn, and the corresponding control component identifier is retrieved from the device resource mapping table of the drilling operation platform, which is composed of the device number of the hardware component and the corresponding sub-code, such as the downhole pressure regulating module number "DA-03" corresponding to the weight on bit adjustment action, and the ground pump control device number "PB-05" corresponding to the pump pressure adjustment action. According to the control type field, the corresponding component set is directly retrieved, and a mapping relationship is established with the target parameter and the adjustment amplitude in the control item. Then, the control action is converted into an instruction format through the instruction mapping rule, for example, the weight on bit action with an adjustment amplitude of +12 kN is mapped to "SET_DA-03:INC_12", wherein "SET" is the instruction flag, "DA-03" is the device number, and "INC_12" is the specific action content. The pump pressure action is identified by "INC" or "DEC" according to the pressure increase or decrease. After completing the instruction mapping, each instruction is bound with the corresponding hardware component to generate an activation list. Each record in the list contains a time index, a component number, a target parameter, an instruction content, and an identifier parameter indicating whether a confirmation receipt is required. If the current device exists and is in a standby state, it directly enters the configuration stage and activates the component port. If the device does not respond or is not online, it is marked as abnormal and the current record is removed for subsequent adjustment. Finally, a complete control component call list is formed, which is called by the control link activation link.

[0095] S503: According to the control instruction sequence in the control component call list and the associated hardware response logic, a continuous control link activation operation is performed to build a closed loop relationship between the weight on bit and the pump pressure adjustment in the time sequence chain, and to establish a coalbed methane downhole drilling construction parameter optimization control process.

[0096] Read each instruction record in time ascending order from the head of the list, and respectively activate the drilling pressure control link and the pump pressure control link according to the regulation type. In the execution process, first check whether the current time meets the triggering condition of the control action, if yes, send the control instruction to the corresponding hardware component, after the component receives the instruction, it enters the response preparation state, and according to the device response logic, judge whether it returns the state feedback within the specified response time, if the feedback is normal, confirm that the control action is completed, and enter the processing flow of the next control instruction, if the feedback is abnormal or there is no feedback within the timeout, mark the component as an abnormal state, skip the current instruction to execute the subsequent instruction, in the link control logic, the drilling pressure control action needs to continuously maintain the feedback stable value for at least two seconds, and the pump pressure control action requires that the value fluctuation within three consecutive seconds does not exceed the set fluctuation range ±0.2MPa, record the starting time and feedback confirmation time of each control action, after executing all instruction sequences, analyze the response interval between all control actions, if all actions are completed within the response time window and no cross-border intersection occurs, determine that the link activation is completed, record the control chain as a complete execution batch, and generate a structured control link log based on the sequence and feedback response of each control action, through the log, the closed-loop process of each regulation action of drilling pressure and pump pressure in the execution sequence can be traced back gradually, thereby establishing the coal seam gas downhole drilling construction parameter optimization control flow.

[0097] Referring to Figure 7 A coal seam gas downhole drilling construction parameter optimization system, comprising:

[0098] The acoustic wave signal processing module is configured to achieve S1: obtaining an acoustic wave response signal installed below a drill bit, based on a preset multi-point arrangement and excitation result, extracting a reflection signal arrival time and calculating a propagation time delay, and a return amplitude change value, and generating an acoustic wave propagation delay sequence in time sequence;

[0099] The drilling pressure fluctuation identification module is configured to achieve S2: collecting drilling pressure data stream corresponding to the acoustic wave propagation delay sequence, aligning and comparing the change gradient and peak interval of the drilling pressure data stream and the acoustic wave propagation delay sequence in the same time period, identifying the fluctuation mode of the acoustic wave parameter deviating from the preset reference range, and outputting a drilling pressure change trajectory;

[0100] The pump pressure synchronous analysis module is configured to achieve S3: marking a time segment with an upward slope exceeding a threshold value in the drilling pressure change trajectory, extracting a pump pressure sampling record in the time segment, analyzing the synchronization of the pump pressure sampling record and the drilling pressure change trajectory, and generating a pump pressure change trend;

[0101] The linkage regulation extraction module is configured to achieve S4: comparing the drilling pressure change trajectory and the pump pressure change trend in response delay, amplitude change direction and change duration, extracting a regulation action combination meeting the linkage execution condition, and constructing a construction control action sequence;

[0102] The intelligent control execution module is used for realizing S5: based on the construction control action sequence, extracting the control instruction content including the drilling pressure adjusting action and the pump pressure adjusting action, activating the regulation and control component of the drilling platform, driving the hardware response process, and forming the coal bed gas downhole drilling construction parameter optimization control flow.

[0103] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed by the present application, which should be covered within the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A method for optimizing drilling parameters in coalbed methane wells, characterized in that, Includes the following steps: S1: Acquire the acoustic response signal installed below the drill bit, extract the arrival time of the reflected signal and calculate the propagation time delay based on the preset multi-point layout and excitation results, as well as the echo amplitude change value, and generate the acoustic propagation delay sequence in time order. S2: Collect the drilling pressure data stream corresponding to the acoustic propagation delay sequence, align and compare the change gradient and peak interval of the drilling pressure data stream and the acoustic propagation delay sequence in the same time period, identify the fluctuation pattern of acoustic parameters deviating from the preset reference range, and output the drilling pressure change trajectory. S3: Mark the time segments in the drilling pressure change trajectory where the upward slope exceeds the threshold, extract the pump pressure sampling records within the time segments, analyze the synchronicity between the rise and fall trends of the pump pressure sampling records and the drilling pressure change trajectory, and generate the pump pressure change trend. S4: Compare the drilling pressure change trajectory with the pump pressure change trend, and extract the combination of control actions that meet the linkage execution conditions based on the consistency in response delay, amplitude direction and change duration, and construct the construction control action sequence. The specific steps are as follows: S401: Based on the control point information marked in the drilling pressure change trajectory and the pump pressure change trend, extract the response start time of each pair of control points, compare the time difference with the preset response delay threshold, and filter the control point pairs that meet the delay consistency condition to obtain a set of synchronous response control points. S402: Call the synchronous response control points to collect the amplitude change direction of drilling pressure and pump pressure, compare the change sign characteristics of the same control points, and make a judgment by combining the duration interval difference and the change duration threshold, filter point pairs that match the change direction and duration, and generate a linkage execution control combination; S403: Based on the start time of the control actions in the linkage execution control combination, sort all control actions in ascending order to establish a construction control action sequence; S5: Based on the construction control action sequence, extract the control command content including drilling pressure adjustment action and pump pressure adjustment action, activate the control components of the drilling platform, drive the hardware response process, and form an optimized control process for coalbed methane downhole drilling construction parameters.

2. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The acoustic propagation delay sequence includes propagation time difference, echo amplitude change value, and time series index; the drilling pressure change trajectory includes change gradient characteristics, peak interval characteristics, and trend coupling parameters; the pump pressure change trend includes numerical rise and fall amplitude, synchronization index, and time period label; the construction control action sequence includes response delay parameters, amplitude change direction identifier, and change duration; and the coalbed methane downhole drilling construction parameter optimization control process includes drilling pressure adjustment command, pump pressure adjustment command, and control component activation parameters.

3. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The linkage execution conditions refer to the conditions that the response delay of the drilling pressure control point and the pump pressure control point does not exceed a preset threshold, the amplitude direction is consistent, and the change is continuous.

4. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The specific steps of S1 are as follows: S101: Acquire the acoustic response signal installed below the drill bit, extract the received timestamp of the signal packet, calculate the time difference between adjacent sampling points, and generate a propagation time difference sequence; S102: Call the propagation time difference sequence, extract the signal strength value in the signal packet, calculate the strength difference between adjacent sampling points, record the amplitude change of the nodes in sequence, and generate an echo amplitude change value sequence. S103: The propagation time difference sequence and the echo amplitude change value sequence are spliced ​​together according to their index order, and the time series of the nodes are sorted to generate the sound wave propagation delay sequence.

5. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The specific steps of S2 are as follows: S201: Collect the drilling pressure data stream corresponding to the time axis of the acoustic wave propagation delay sequence, extract the drilling pressure value at each time node, compare the timestamps of the two sets of data according to the time axis, perform synchronization processing operation point by point, and establish a time-aligned drilling pressure sequence; S202: Call the time-aligned drill pressure sequence and the acoustic propagation delay sequence, calculate the gradient value of change and the interval parameter between adjacent peaks within the same time period, compare the synchronicity of the two sets of parameter curves, extract abnormal offset feature points, and obtain the corresponding features of drill pressure fluctuation; S203: Based on the characteristics of the drilling pressure fluctuation, collect the correspondence between the trend of acoustic wave change and the direction of drilling pressure change, perform point-by-point comparison of the direction of change of acoustic wave delay value and drilling pressure value within the same time period, determine the consistency of the two in the trend of change, and perform sequence splicing and trajectory mapping on the coupling matching interval to generate the drilling pressure change trajectory.

6. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The specific steps for S3 are as follows: S301: Calculate the slope of the drilling pressure change at adjacent time nodes point by point in the drilling pressure change trajectory, compare the slope value with the preset slope threshold, filter out continuous time nodes with slope values ​​exceeding the slope threshold, and mark and aggregate the time to obtain high slope drilling pressure time segments. S302: Based on the time range of the high-inclination drilling pressure time segment, collect pump pressure sampling records within the corresponding time axis, and perform difference calculation on the pump pressure values ​​of adjacent sampling points to form a pump pressure rise and fall direction sequence. At the same time, perform synchronization sequence alignment on the drilling pressure values ​​to obtain a pump pressure and drilling pressure synchronization sequence. S303: Call the pump pressure and drilling pressure synchronization sequence, determine the consistency of the rising and falling direction of the pump pressure value in continuous time nodes, and arrange and serialize the nodes that meet the continuous change conditions in time order to generate the pump pressure change trend.

7. The method for optimizing coalbed methane downhole drilling parameters according to claim 1, characterized in that, The specific steps of S5 are as follows: S501: Based on the sorted control items in the construction control action sequence, extract the control type, adjustment target and adjustment range corresponding to each control action in sequence, and classify and record the actions belonging to the drilling pressure control category and the pump pressure control category respectively, and establish a control command parameter set; S502: Call the drilling pressure adjustment action and pump pressure adjustment action in the control command parameter set, retrieve the corresponding control component identifier in the drilling operation platform, align the control action with the corresponding hardware command through the command mapping rule, complete the component activation configuration, and generate a control component call list; S503: Based on the control command sequence and associated hardware response logic in the control component call list, execute the continuous control link activation operation, construct the closed-loop relationship between drilling pressure and pump pressure regulation in the time sequence chain, and establish the optimization control process for coalbed methane downhole drilling construction parameters.

8. A coalbed methane well downhole drilling parameter optimization system, characterized in that, The system is used to implement the method for optimizing coalbed methane downhole drilling construction parameters according to any one of claims 1-7, the system comprising: The acoustic signal processing module is used to achieve S1: acquiring the acoustic response signal installed below the drill bit, extracting the arrival time of the reflected signal and calculating the propagation time delay based on the preset multi-point layout and excitation results, as well as the echo amplitude change value, and generating an acoustic propagation delay sequence in chronological order; The drilling pressure fluctuation identification module is used to implement S2: acquiring the drilling pressure data stream corresponding to the acoustic propagation delay sequence, aligning and comparing the change gradient and peak interval of the drilling pressure data stream and the acoustic propagation delay sequence in the same time period, identifying the fluctuation pattern of acoustic parameters deviating from the preset reference range, and outputting the drilling pressure change trajectory; The pump pressure synchronization analysis module is used to implement S3: mark the time segment in the drilling pressure change trajectory where the upward slope exceeds the threshold, extract the pump pressure sampling record within the time segment, analyze the synchronicity between the rise and fall trend of the pump pressure sampling record and the drilling pressure change trajectory, and generate the pump pressure change trend; The linkage control extraction module is used to achieve S4: compare the drilling pressure change trajectory with the pump pressure change trend, and extract the combination of control actions that meet the linkage execution conditions based on the consistency in response delay, amplitude direction and change duration, and construct the construction control action sequence. The intelligent control execution module is used to implement S5: based on the construction control action sequence, extract the control command content including drilling pressure adjustment action and pump pressure adjustment action, activate the control components of the drilling platform, drive the hardware response process, and form an optimized control process for coalbed methane downhole drilling construction parameters.

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