An equivalent extraction method of bedding long borehole based on borehole segmentation difference value penetration enhancement

Abstract

The application provides an equivalent extraction method of bedding long borehole based on borehole segmented difference value penetration, and relates to the field of coal mine gas control. The bedding long borehole is segmented, and the extraction radius of each segment is investigated separately. By investigating the extraction radius of the segment of the long borehole without measures and the extraction radius of the segment of the long borehole with different penetration parameters after the penetration of the long borehole, the extraction radius law of the long borehole after the penetration suitable for investigating the coal seam gas and geological occurrence is formed. The extraction time is determined according to the production plan, the extraction radius of different segments is obtained according to the investigation result, the minimum value of the extraction radius of different segments is taken as the extraction radius of the batch of bedding long boreholes, and then the borehole spacing design is carried out. The long borehole is constructed according to the borehole spacing and the selected penetration measure is taken, and then the extraction pipeline is connected to carry out the extraction, so that the equivalent extraction of the long borehole is formed. The technical method is simple and easy to implement, and has high reliability. The contradiction between the extraction blank zone and the long borehole construction amount can be effectively avoided, and the purpose of the equivalent extraction of the long borehole is achieved.

Description

Technical Field

[0001] This invention belongs to the field of coal mine gas control, and particularly relates to an equivalent extraction method for long boreholes along the bedding plane based on the permeability enhancement of borehole segment difference. Background Technology

[0002] Mine gas disasters have long threatened the lives of coal miners and the safe production of coal mines. Gas drainage is the fundamental means to reduce coal seam gas pressure and content, and is the most effective measure for controlling gas disasters. With the maturity of coal mine gas drainage technology and the technological upgrading of drainage borehole construction equipment in my country, gas control is gradually trending towards large-area gas drainage. Long borehole drainage technology along the seam is being used more and more widely in mines, and the length of boreholes is constantly increasing. At the same time, to reduce the number of boreholes, it is necessary to increase the effective drainage radius of a single borehole. Currently, various methods of increasing borehole permeability are used to increase the permeability of the coal body around the borehole, expand the drainage radius, and improve drainage efficiency. In long boreholes along the seam, as the drainage length increases, the difference between the drainage negative pressure at the borehole opening and the drainage negative pressure at the bottom of the borehole becomes larger and larger, and the drainage radius gradually decreases from the borehole opening to the bottom. When increasing the permeability of long boreholes along the bedding plane, the same permeability increase parameters are used on site. However, the extraction radius of the borehole after permeability increase is uneven along the entire length of the borehole. In actual extraction, designing based on the extraction radius near the borehole opening will create an extraction blank zone near the bottom of the borehole, while designing based on the extraction radius near the bottom of the borehole will cause the effective extraction area of ​​the borehole to overlap. This will eventually lead to major safety hazards, causing mine safety accidents or wasting extraction capacity and mine human and financial resources. Summary of the Invention

[0003] To address the above problems, this invention proposes an equivalent extraction method for long boreholes along the bedding plane based on borehole segment difference permeability enhancement, in order to solve the problem of uneven extraction range of long boreholes along the bedding plane.

[0004] To achieve the above objectives, the technical solution adopted in this invention is an equivalent extraction method for long boreholes along the bedding plane based on borehole segment differential permeability enhancement, the specific steps of which are as follows:

[0005] Step 1: In the designed long borehole extraction area, construct group S of long boreholes along the bedding plane according to the same drilling parameters;

[0006] The drilling parameters include the borehole diameter, borehole length, borehole layer, borehole angle, borehole sealing method, and borehole sealing length for in-between long boreholes.

[0007] Step 2: Select the anti-reflective measures to be used;

[0008] The permeability enhancement measures are implemented by one or a combination of the following methods: hydraulic fracturing, hydraulic cavity creation, hydraulic fracturing, carbon dioxide fracturing, high-pressure air fracturing, and ultrasonic permeability enhancement.

[0009] Step 3: Divide each borehole in each group of in-seam boreholes into N segments; the number of segments is determined based on the coverage of the permeability enhancement measures and the effectiveness of the borehole length.

[0010] Furthermore, the coverage of the enhanced penetration measures refers to the requirement that the shortest design segment length must meet the condition that the enhanced penetration measures in this segment do not affect the extraction radius determination of adjacent segments. That is, after each segment takes enhanced penetration measures, the maximum influence range is calculated, and the boundary of the influence range of the enhanced penetration effect is located between the boundary of this segment and the midpoint of the adjacent segment.

[0011] Furthermore, the validity of the borehole length means that the longest borehole length of each borehole segment must meet the requirement that the length of the uniformly permeable portion of the segment does not exceed the extraction radius after permeability enhancement of that segment.

[0012] Step 4: Take the first group of bedding-length boreholes in Group S as the conventional reference group. After construction, directly seal the boreholes and connect the extraction pipeline for extraction. Measure the extraction radius at different segments and extraction times in the conventional reference group of the bedding-length boreholes, and record it as R. ij , represents the extraction radius of the i-th borehole segment at the j-th extraction time, where i is the segment number of the borehole segment, i = 1, 2, ..., N, N is the number of borehole segments, j is the number of different extraction times when the extraction radius is determined, j = 1, 2, ..., M, M is the total number of extraction times, and the different extraction times are sorted in ascending order.

[0013] The extraction radius was determined as follows: the extraction radius of the long boreholes along the bedding plane in the conventional reference group was determined by the content method or the pressure method, and the extraction radius of the different segments was taken as the average value of all boreholes in the group in that segment.

[0014] Furthermore, when determining the extraction radius at different extraction times in different segments of the conventional reference group along the bedding length, the boundary position of the segment in the direction of the bottom of the borehole was determined.

[0015] Step 5: Take the other groups of long boreholes along the bedding plane in Group S, excluding Group 1, as the penetration enhancement comparison group. Perform penetration enhancement operations on the long boreholes along the bedding plane in the penetration enhancement comparison group according to the selected penetration enhancement measures. The penetration enhancement parameters at different segments of the long boreholes along the bedding plane in the penetration enhancement comparison group are selected from the given set of penetration enhancement parameters.

[0016] The anti-reflection parameter set contains P groups of anti-reflection parameters, denoted as Z. k k is the anti-reflection parameter group number, k = 1, 2, ..., P;

[0017] The enhanced penetration parameters are designed within the allowable capacity range of the enhanced penetration equipment. The maximum boundary value of the enhanced penetration parameters is the maximum value within the allowable capacity range of the enhanced penetration equipment, and the minimum boundary value of the enhanced penetration parameters is the minimum enhanced penetration parameter that increases the extraction radius after enhanced penetration.

[0018] The anti-reflective parameters are grouped according to the maximum boundary value, minimum boundary value and the number of design anti-reflective parameter groups. The larger the group number of the anti-reflective parameter, the larger the value of the anti-reflective parameter in it.

[0019] The selection of the enhanced penetration parameters shall be such that the enhanced penetration parameter group number selected for the borehole segment with the larger segment number in the same group of in-seam long boreholes in the enhanced penetration comparison group shall not be less than the enhanced penetration parameter group number selected for the borehole segment with the smaller segment number.

[0020] Furthermore, in the different groups of in-bedding long boreholes in the enhanced permeability comparison group, the enhanced permeability parameters can be selected according to the comparison requirements with the in-bedding long boreholes in the conventional reference group.

[0021] Step 6: Connect the in-bedding long boreholes in the enhanced permeability control group to the extraction pipeline for extraction, and measure the extraction radius of the in-bedding long boreholes in the enhanced permeability control group under different extraction times, different segments, and different enhancement parameters, denoted as R. ijk , represents the extraction radius under the condition that the k-th set of permeability enhancement parameters is used in the i-th borehole section at the j-th extraction time;

[0022] The method for determining the extraction radius at each segment of the in-beam long borehole in the enhanced permeability comparison group is the same as the method selected in step 4.

[0023] Furthermore, for the selected method for determining the extraction radius, the selected measurement location is consistent with the location for determining the extraction radius in step 4.

[0024] Furthermore, for the selected method for determining the extraction radius, the selected measurement time is consistent with the time for determining the extraction radius in step 4.

[0025] The extraction pipeline should be the same as the extraction pipeline of the conventional reference group in step 4, and the extraction negative pressure of the conventional reference group and the enhanced permeability comparison group should be the same.

[0026] Step 7: Calculate the amplification factor A of the in-bedding long borehole extraction radius at different segments and extraction times in the permeability comparison group using different permeability enhancement parameters. ijk ;

[0027] The calculation method for the amplification factor is as follows:

[0028] A ijk =R ijk / R ij(1)

[0029] Step 8: Filter and process the calculated data of the growth rate coefficient;

[0030] The filtering of the calculation results of the amplification coefficient, when A ijk If the calculation result is less than 1, the calculation result of the growth coefficient is invalid, and the other growth coefficients are considered valid results;

[0031] The processing of the amplification coefficient calculation results involves calculating the amplification coefficient for different groups of in-seam long boreholes in the permeability comparison group when there are cases where the segment number, extraction time, and permeability parameters are all the same. The final result is the average of the valid results.

[0032] Step 9: Determine the expected extraction time based on the on-site construction time requirements, and design the borehole spacing based on the extraction radius measurement results of the in-seam long borehole in the conventional reference group and the amplification coefficient of the in-seam long borehole in the enhanced permeability comparison group.

[0033] The method for designing the borehole spacing is as follows: R is taken as the extraction radius at different segments of the in-seam long borehole in the conventional reference group under a determined expected extraction time. i Let Z be the anti-reflection parameter corresponding to different segments. k The corresponding growth rate is A. i According to the extraction radius R i and the growth rate coefficient A i Determine the design extraction radius R = min{R i *A i The borehole spacing is obtained based on the designed extraction radius R.

[0034] The borehole spacing should be less than or equal to the designed extraction radius R;

[0035] The method for determining the extraction radius of the in-seam long borehole in the conventional reference group is as follows: After determining the extraction time, the extraction radius at different segments can be determined by fixing the value of j in step 4. i ;

[0036] The anti-reflective parameter Z k Select from the anti-reflective parameters designed in step 5;

[0037] Furthermore, the permeability enhancement parameters selected for each borehole segment along the bedding plane should be the permeability enhancement parameters selected in step 5 for that borehole segment;

[0038] Furthermore, the permeability enhancement parameters selected at different borehole sections were compared with the extraction radii R of different segments in the conventional reference group of in-seam long boreholes. i After the amplification, the extraction radius R of different segments after permeability enhancement should be... ik Minimum standard deviation;

[0039] Step 10: Drill holes according to the borehole spacing and adopt the enhanced permeability parameters selected in Step 9. Then connect the extraction pipeline to perform extraction, forming a uniform equivalent extraction of the long borehole along the bedding plane.

[0040] The drilling parameters should be the same as those described in step 1.

[0041] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0042] This invention combines the principle of increasing the extraction radius through permeability enhancement operations with the principle of the extraction radius of long boreholes gradually decreasing from the borehole opening to the bottom. It can quickly test and obtain suitable permeability enhancement parameter values ​​in a relatively economical way, and use the segmented differential permeability enhancement method to modify the long borehole along the bedding plane, so that the long borehole achieves an approximately equivalent extraction effect. This method is simple, easy to implement, and highly reliable, and can effectively avoid the contradiction between the extraction blank zone and the amount of drilling work. Attached Figure Description

[0043] Figure 1 This is a flowchart of an equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement in an embodiment of the present invention;

[0044] Figure 2 This is a schematic diagram of the drilling sequence segment numbering in an embodiment of the present invention;

[0045] Among them, 3-1. Borehole sealing section; 3-2. Borehole extraction section; 3-3. Borehole segment line; 3-4. Borehole segment number;

[0046] Figure 3 This is a graph showing the trend of the extraction radius of the in-seam long borehole without any permeability enhancement measures in this embodiment of the invention;

[0047] Among them, 1. Length borehole along the bedding plane; 2-1. Borehole opening; 2-2. Borehole bottom; 4-1. Effective extraction range of the original borehole;

[0048] Figure 4 This is a schematic diagram illustrating the increase in the extraction radius of the hydraulically slotted permeability-enhancing borehole in an embodiment of the present invention;

[0049] Among them, 4-2. The value of the extraction radius of the original borehole segment; 4-3. The value of the extraction radius of the borehole segment after permeability enhancement; 5-2. Hydraulic slotting.

[0050] Figure 5 This is a schematic diagram of the cross-segment numbering of boreholes in an embodiment of the present invention;

[0051] Figure 6 This is a schematic diagram illustrating the increase in the extraction radius of hydraulic fracturing permeability enhancement boreholes in an embodiment of the present invention;

[0052] Among them, 4-4. Effective extraction range of the borehole segment after permeability enhancement; 5-1. Hydraulic fracturing fracture. Detailed Implementation

[0053] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0054] This invention divides long boreholes along the bedding plane into segments, and examines the extraction radius of each segment separately. By examining the extraction radius of long borehole segments without measures and the extraction radii of different segments after permeability enhancement with different parameters, a pattern of extraction radius after permeability enhancement of boreholes is formed, which is applicable to the investigation of coal seam gas and geological occurrence. The extraction time is determined according to the production plan, and the extraction radius at different segments is obtained based on the investigation results. The minimum value is taken as the extraction radius of the long boreholes along the bedding plane in this batch, and then the borehole spacing is designed.

[0055] Example 1

[0056] A method for equivalent extraction of long boreholes along the bedding plane based on borehole segment differential permeability enhancement, such as... Figure 1 As shown, it includes the following steps:

[0057] Step 1: In the designed long borehole extraction area, construct two sets of long boreholes along the bedding plane, each set containing three long boreholes along the bedding plane, according to the same drilling construction parameters.

[0058] Step 2: Select hydraulic cavity creation as a permeability enhancement measure;

[0059] Step 3: Divide each borehole in each group of longitudinal boreholes into 9 equal segments, such as... Figure 2 As shown, all boreholes are divided into sections and numbered from D1 to D9, arranged in order from the borehole opening to the bottom of the borehole.

[0060] Step 4: Take the first group of the two groups of bedding-length boreholes as the conventional reference group, and then proceed with the conventional reference group as follows: Figure 3 The borehole was sealed as shown, and the pipeline was connected for extraction. The extraction radius of each section of the borehole was measured using the content method. The extraction radius was measured at three time points: 3 months, 6 months, and 9 months, and recorded as follows:

[0061] Step 5: Take the other groups of long boreholes in the two groups of long boreholes in the bedding as the permeability enhancement control group, number them according to the numbering method in Step 3, and use hydraulic cavity creation to enhance the permeability of the boreholes in the bedding. The cavity diameter of the nine segments increases sequentially, namely Z1 to Z9.

[0062] Step 6: Connect the in-seam long boreholes in the enhanced permeability control group to the extraction pipeline for extraction. Measure the extraction radius of each segment of the enhanced borehole using the content method. Measure the extraction radius at the three time points specified in Step 4, and record the measured radii as follows:

[0063] Step 7: Using Formula A ijk =R ijk / R ij Calculate the increase coefficient of the extraction radius for different penetration enhancement methods at different time segments, denoted as .

[0064] Step 8: Filter and process the calculated data of the growth rate coefficient;

[0065] Step 9: According to the mine production plan, the extraction time is required to be 6 months. Taking 6 months as a reference, the extraction radius of the ordinary borehole segment is R. 12 ~R 92 Based on the rule for determining the extraction radius, we take R = min{R} i *A i},like Figure 4 As shown, the corresponding permeability enhancement parameters are determined to be Z'1~Z'9, the overall extraction radius of the long borehole after permeability enhancement is determined to be R, and the borehole spacing is designed according to the determined extraction radius R;

[0066] Step 10: Drill holes according to the borehole spacing and adopt the enhanced permeability parameters selected in Step 9. Then connect the extraction pipeline to perform extraction, forming a uniform equivalent extraction of the long borehole along the bedding plane.

[0067] Example 2

[0068] The equivalent extraction method for long boreholes along the bedding plane based on borehole segment differential permeability enhancement includes the following steps:

[0069] Step 1: In the designed long borehole extraction area, construct two sets of long boreholes along the bedding plane according to the same drilling construction parameters, with each set containing two long boreholes along the bedding plane.

[0070] Step 2: Select hydraulic fracturing as a permeability enhancement measure;

[0071] Step 3: Divide each borehole in each group of longitudinal boreholes into 8 equal segments, such as... Figure 5 The drill holes are divided into sections and numbered as D1 to D8, arranged in order from the borehole opening to the bottom of the hole.

[0072] Step 4: Take the first group of the two groups of bedding-length boreholes as the conventional reference group, and then proceed with the conventional reference group as follows: Figure 3 The borehole was sealed as shown, and the pipeline was connected for extraction. The extraction radius of each section of the borehole was measured using the pressure method. The extraction radius was measured at four time points: 6 months, 9 months, 12 months, and 15 months, and denoted as .

[0073] Step 5: Take the other groups of long boreholes in the two groups of in-between as the permeability enhancement control group, number them according to the numbering method in Step 3, and use hydraulic fracturing to enhance the permeability of the in-between boreholes. The hydraulic fracturing pressure of the 8 segments increases sequentially, namely Z1 to Z8.

[0074] Step 6: Connect the in-seam long boreholes in the enhanced permeability control group to the extraction pipeline for extraction. Measure the extraction radius of each segment of the enhanced borehole using the content method. Measure the extraction radius at the three time points specified in Step 4, and record the measured radii as follows:

[0075] Step 7: Using Formula A ijk =R ijk / R ij Calculate the increase coefficient of the extraction radius for different penetration enhancement methods at different time segments, denoted as .

[0076] Step 8: Filter and process the calculated data of the growth rate coefficient;

[0077] Step 9: According to the mine production plan, the extraction period is required to be 12 months. Taking 12 months as a reference, the extraction radius of the ordinary borehole segment is R. 12 ~R 82 Based on the rule for determining the extraction radius, we take R = min{R} i *A i},like Figure 6 As shown, the corresponding permeability enhancement parameters are determined to be Z'1~Z'9, the overall extraction radius of the long borehole after permeability enhancement is determined to be R, and the borehole spacing is designed according to the determined extraction radius R;

[0078] Step 10: Drill holes according to the borehole spacing and adopt the permeability enhancement parameters selected in Step 9. Then connect the extraction pipeline to perform extraction, forming a uniform equivalent extraction of the long borehole along the formation.

[0079] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method for equivalent extraction of long boreholes along the bedding plane based on borehole segment differential permeability enhancement, characterized in that, Includes the following steps: Step 1: In the designed long borehole extraction area, construct group S of long boreholes along the bedding plane according to the same drilling parameters; Step 2: Select the anti-reflective measures to be used; Step 3: Divide each borehole in each group of in-seam boreholes into N segments; Step 4: Using the first group of bedding-length boreholes in Group S as the conventional reference group, after construction, directly seal the boreholes and connect the extraction pipeline for extraction. Measure the extraction radius at different segments and extraction times in the conventional reference group's bedding-length boreholes, and record it as... , indicating that at the j-th sampling time, the first digit is... The extraction radius of each borehole section The section numbering is used to denote the segment of the borehole. =1, 2, ..., N, where N is the number of borehole sections, j is the number of different extraction times when the extraction radius is determined, j=1, 2, ..., M, where M is the total number of extraction times, and the different extraction times are sorted in order from shortest to longest. Step 5: Take the other groups of long boreholes along the bedding plane in Group S, excluding Group 1, as the penetration enhancement comparison group. Perform penetration enhancement operations on the long boreholes along the bedding plane in the penetration enhancement comparison group according to the selected penetration enhancement measures. The penetration enhancement parameters at different segments of the long boreholes along the bedding plane in the penetration enhancement comparison group are selected from the given set of penetration enhancement parameters. The P sets of anti-reflection parameters in the anti-reflection parameter set are collectively denoted as Z k k is the anti-reflection parameter group number, k = 1, 2, …, P. The enhanced penetration parameters are designed within the allowable capacity range of the enhanced penetration equipment. The maximum boundary value of the enhanced penetration parameters is the maximum value within the allowable capacity range of the enhanced penetration equipment, and the minimum boundary value of the enhanced penetration parameters is the minimum enhanced penetration parameters that increase the extraction radius after enhanced penetration. The anti-reflective parameters are grouped according to the maximum boundary value, minimum boundary value and the number of design anti-reflective parameter groups. The larger the group number of the anti-reflective parameter, the larger the value of the anti-reflective parameter in it. The selection of the enhanced penetration parameters shall be such that the enhanced penetration parameter group number selected for the borehole segment with the larger segment number in the same group of in-seam long boreholes in the enhanced penetration comparison group shall not be less than the enhanced penetration parameter group number selected for the borehole segment with the smaller segment number. In the enhanced permeability comparison group, the same segment number of the borehole segment in different groups of in-between long boreholes is selected according to the comparison requirements with the in-between long boreholes in the conventional reference group; Step 6: Connect the in-bedding long boreholes in the enhanced permeability control group to the extraction pipeline for extraction, and measure the extraction radius of the in-bedding long boreholes in the enhanced permeability control group under different extraction times, different segments, and different enhancement parameters, denoted as R. ijk , represents the extraction radius of the i-th borehole section at the j-th extraction time under the condition of using the k-th set of permeability enhancement parameters; Step 7: Calculate the amplification factor A of the in-bedding long borehole extraction radius at different segments and extraction times in the permeability comparison group using different permeability enhancement parameters. ijk ; Step 8: Filter and process the calculated data of the growth rate coefficient; Step 9: Determine the expected extraction time based on the on-site construction time requirements, and design the borehole spacing based on the extraction radius measurement results of the in-seam long borehole in the conventional reference group and the amplification coefficient of the in-seam long borehole in the enhanced permeability comparison group. The method for designing the borehole spacing is as follows: R is taken as the extraction radius at different segments of the in-seam long borehole in the conventional reference group under a determined expected extraction time. i Let Z be the anti-reflection parameter corresponding to different segments. k The corresponding growth rate is A. i According to the extraction radius R i and the growth rate coefficient A i Determine the design extraction radius R = min{R i *A i The borehole spacing is obtained based on the designed extraction radius R. The borehole spacing should be less than or equal to the designed extraction radius R; The method for determining the extraction radius of the in-seam long borehole in the conventional reference group is as follows: After determining the extraction time, the extraction radius at different segments can be determined by fixing the value of j in step 4. i ; The anti-reflection parameter Z k Select from the anti-reflective parameters designed in step 5; The permeability enhancement parameters selected for each borehole segment along the bedding plane should be the permeability enhancement parameters selected in step 5 for this borehole segment; The permeability enhancement parameters selected at different borehole sections affect the extraction radius R of different segments in the in-bedding long boreholes of the conventional reference group. i After the amplification, the extraction radius R of different segments after permeability enhancement should be... ik Minimum standard deviation; Step 10: Drill holes according to the borehole spacing and adopt the permeability enhancement parameters selected in Step 9. Then connect the extraction pipeline to perform extraction, forming a uniform equivalent extraction of the long borehole along the formation.

2. The equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement according to claim 1, characterized in that, The drilling parameters mentioned in step 1 include the drilling diameter, drilling length, drilling layer, drilling angle, drilling sealing method, and drilling sealing length for in-seam long boreholes.

3. The equivalent extraction method of bedding long borehole according to claim 1, wherein, The permeability enhancement measures described in step 2 can be implemented individually or in combination with one or more of the following methods: hydraulic fracturing, hydraulic cavity creation, hydraulic fracturing, carbon dioxide fracturing, high-pressure air fracturing, and ultrasonic permeability enhancement.

4. The equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement according to claim 1, characterized in that, The number of segments in step 3 is determined based on the coverage of the penetration enhancement measures and the effectiveness of the borehole length; The coverage of the enhanced penetration measures refers to the requirement that the shortest design segment length must meet the condition that the enhanced penetration measures in this segment do not affect the extraction radius measurement of adjacent segments. That is, after each segment takes enhanced penetration measures, the maximum influence range is calculated, and the boundary of the influence range of the enhanced penetration effect is located between the boundary of this segment and the midpoint of the adjacent segment. The validity of the borehole length refers to the requirement that the longest borehole length in each borehole segment must not exceed the extraction radius after the permeability enhancement of that segment.

5. The equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement according to claim 1, characterized in that, The determination of the extraction radius in step 4: The extraction radius of different sections of the in-seam long borehole in the conventional reference group is determined by the content method or the pressure method. The extraction radius of different sections is taken as the average value of all boreholes in the group in that section. When determining the extraction radius at different extraction times in different segments of a conventional reference borehole at the same bedding length, the boundary position of that segment in the direction of the bottom of the borehole is determined.

6. The equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement according to claim 1, characterized in that, The method for determining the extraction radius at each segment of the in-beam long borehole in the enhanced permeability comparison group described in step 6 is the same as the method selected in step 4. For the selected method for determining the extraction radius, the selected measurement location is consistent with the location for determining the extraction radius in step 4. For the selected method for determining the extraction radius, the selected measurement time is the same as the time for determining the extraction radius in step 4. The extraction pipeline should be the same as the extraction pipeline of the conventional reference group in step 4, and the extraction negative pressure of the conventional reference group and the enhanced permeability comparison group should be the same.

7. The bedding-conformable long borehole equivalent extraction method based on borehole subsection difference penetration according to claim 1, characterized in that, The calculation method for the amplification coefficient mentioned in step 7 is as follows: A ijk =R ijk / R ij (1)。 8. The equivalent extraction method for in-seam long boreholes based on borehole segment differential permeability enhancement according to claim 1, characterized in that, The filtering of the amplification coefficient calculation results in step 8, when A ijk If the calculation result is less than 1, the calculation result of the growth coefficient is invalid, and the other growth coefficients are considered valid results; The processing of the amplification coefficient calculation results involves calculating the amplification coefficient for different groups of in-seam long boreholes in the permeability comparison group when there are cases where the segment number, extraction time, and permeability enhancement parameters are all the same. The final result is the average of the valid results.

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