Coal seam anti-reflection method, electronic equipment, storage medium and computer program

Abstract

The invention discloses a coal seam anti-reflection method, electronic equipment, a storage medium and a computer program. The method belongs to the field of mineral engineering and comprises the steps that initial geological parameters of a to-be-anti-reflection area are obtained, the to-be-anti-reflection area comprises a ground anti-reflection area and an underground anti-reflection area, and the ground anti-reflection area corresponds to the underground anti-reflection area; on the basis of the initial geological parameters, a ground fracturing area is determined from the ground anti-reflection area, and ground fracturing parameters corresponding to the ground fracturing area are determined on the basis of the initial geological parameters; permeability increasing is conducted on the ground fracturing area on the basis of the ground fracturing parameters, and a ground permeability increasing result is obtained; on the basis of the ground anti-reflection result, an underground fracturing area is determined from the underground anti-reflection area, and underground fracturing parameters corresponding to the underground fracturing area are determined on the basis of the ground anti-reflection result; and permeability increasing is conducted on the underground fracturing area based on the underground fracturing parameters. The technical problem that the permeability increasing effect of the coal seam is poor in the prior art is solved.

Description

Technical Field

[0001] The present invention relates to the field of mining engineering, and in particular to a coal seam permeability enhancement method, electronic equipment, storage medium, and computer program. Background Art

[0002] In coal seam gas control and coal seam gas development, in order to reduce the impact of gas on mine ventilation safety and ensure mine safety, coal seam resources can usually be treated with permeability enhancement first. Among the many permeability enhancement technologies, hydraulic fracturing technology has become the main permeability enhancement measure because it can significantly increase the permeability of coal seams and reduce gas flow resistance. However, hydraulic fracturing has problems such as low range control accuracy and large fracturing blank range. Especially under complex geological conditions, the existence of fracturing blank areas makes the coal seam permeability enhancement effect poor.

[0003] To address the above-mentioned problems, no effective solution has been proposed yet. Summary of the invention

[0004] The embodiments of the present invention provide a coal seam permeability enhancement method, an electronic device, a storage medium, and a computer program, so as to at least solve the technical problem of poor coal seam permeability enhancement effect in the related art.

[0005] According to one aspect of an embodiment of the present invention, a coal seam permeability enhancement method is provided, comprising: obtaining initial geological parameters of a region to be enhanced in permeability, wherein the region to be enhanced in permeability comprises: a surface enhanced permeability region and an underground enhanced permeability region, and the surface enhanced permeability region and the underground enhanced permeability region correspond to each other; determining a surface fracturing region from the surface enhanced permeability region based on the initial geological parameters, and determining surface fracturing parameters corresponding to the surface fracturing region based on the initial geological parameters; enhancing permeability of the surface fracturing region based on the surface fracturing parameters to obtain a surface enhanced permeability result; determining an underground fracturing region from the underground enhanced permeability region based on the surface enhanced permeability result, and determining underground fracturing parameters corresponding to the underground fracturing region based on the surface enhanced permeability result; enhancing permeability of the underground fracturing region based on the underground fracturing parameters.

[0006] Furthermore, the initial geological parameters include: ground obstacle parameters, which are used to reflect the obstacle conditions on the ground in the area to be enhanced permeability; based on the initial geological parameters, determining the ground fracturing area from the ground enhanced permeability area, including: obtaining the well location design conditions of the ground vertical well, wherein the ground vertical well is used to perform enhanced permeability treatment on the ground for the ground fracturing area; based on the ground obstacle parameters, selecting the ground fracturing area that matches the well location design conditions from the ground enhanced permeability area.

[0007] Furthermore, the area to be permeable increased contains coal seam resources, and the initial geological parameters also include: coal seam mechanical parameters of the coal seam resources, and coal seam permeability parameters of the coal seam resources, the coal seam mechanical parameters are used to reflect the mechanical properties of the coal seam resources in the area to be permeable increased, and the coal seam permeability parameters are used to reflect the physical properties and rock properties of the coal seam resources in the area to be permeable increased; based on the initial geological parameters, the ground fracturing parameters corresponding to the ground fracturing area are determined, including: based on the coal seam mechanical parameters, determining the expected fracturing pressure of the area to be permeable increased; based on the coal seam permeability parameters, determining the first influencing parameter of the coal seam resources; based on the first influencing parameter, determining the expected fracturing water injection volume of the area to be permeable increased according to a preset formula; based on the expected fracturing pressure and the expected fracturing water injection volume, constructing the ground fracturing parameters.

[0008] Furthermore, the surface permeability enhancement result includes: the coal seam length of the coal seam resources, and the first actual fracturing area generated when the surface permeability enhancement area is enhanced, and the underground fracturing area includes: multiple segmented fracturing areas; based on the surface permeability enhancement result, the underground fracturing area is determined from the underground permeability enhancement area, including: obtaining the first drilling condition of the directional long borehole, wherein the directional long borehole is used to perform permeability enhancement treatment on multiple segmented fracturing areas underground, and the directional long borehole is deployed in a vertical well on the surface; based on the coal seam length and the actual fracturing area, multiple segmented fracturing areas matching the first drilling condition are selected from the underground fracturing area.

[0009] Furthermore, the ground permeability enhancement results also include: the first permeability parameter of the coal seam resources when the ground vertical well is operating, and the underground fracturing parameters include: the first fracturing parameter of the directional long drilling hole; based on the ground permeability enhancement results, the underground fracturing parameters corresponding to the underground fracturing area are determined, including: based on the first permeability parameter, the second influencing parameter of the coal seam resources is determined; based on the second influencing parameter, the first fracturing water injection volume of the area to be permeable is determined according to a preset formula; based on the first fracturing water injection volume and the first preset fracturing parameter, the first fracturing parameter is constructed.

[0010] Furthermore, the underground fracturing area also includes: multiple pulsating fracturing areas, and the underground fracturing parameters also include: a second fracturing parameter corresponding to the downhole permeable drilling hole, the downhole permeable drilling hole is used to perform permeability enhancement treatment on the multiple pulsating fracturing areas underground, and the downhole permeable drilling hole corresponds to the directional long drilling hole; based on the ground permeability enhancement result, the underground fracturing area is determined from the underground permeability enhancement area, including: in response to the start of the directional long drilling hole, obtaining the second actual fracturing area corresponding to the directional long drilling hole, and the second permeability parameter corresponding to the coal seam resources; obtaining the second drilling condition of the downhole permeable drilling hole; based on the first actual fracturing area and the second actual fracturing area, selecting multiple pulsating fracturing areas matching the second drilling condition from the underground fracturing area; constructing the second fracturing parameter based on the second permeability parameter.

[0011] Furthermore, constructing a second fracturing parameter based on the second permeability parameter includes: determining a third influencing parameter of coal seam resources based on the second permeability parameter; determining a second fracturing water injection volume of the area to be permeable according to a preset formula based on the third influencing parameter; constructing a second fracturing parameter based on the second fracturing water injection volume and the second preset parameter.

[0012] According to another aspect of an embodiment of the present invention, a coal seam permeability enhancement device is also provided, comprising: a parameter acquisition device, used to acquire initial geological parameters of the area to be enhanced, wherein the area to be enhanced includes: a surface enhanced permeability area and an underground enhanced permeability area, and the surface enhanced permeability area and the underground enhanced permeability area correspond to each other; a first determination device, used to determine a surface fracturing area from the surface enhanced permeability area based on the initial geological parameters, and to determine surface fracturing parameters corresponding to the surface fracturing area based on the initial geological parameters; a first permeability enhancement device, used to enhance the permeability of the surface fracturing area based on the surface fracturing parameters to obtain a surface permeability enhancement result; a second determination device, used to determine an underground fracturing area from the underground enhanced permeability area based on the surface enhanced permeability result, and to determine underground fracturing parameters corresponding to the underground fracturing area based on the surface enhanced permeability result; and a second permeability enhancement device, used to enhance the permeability of the underground fracturing area based on the underground fracturing parameters.

[0013] According to another aspect of an embodiment of the present invention, there is further provided an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the method in each embodiment of the present invention is executed when the program is running.

[0014] According to another aspect of an embodiment of the present invention, a computer-readable storage medium is provided. The computer-readable storage medium includes a stored executable program, wherein when the executable program is running, the device where the computer-readable storage medium is located is controlled to execute the methods in various embodiments of the present invention.

[0015] According to another aspect of an embodiment of the present invention, a computer program product is provided, including a computer program. When the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0016] According to another aspect of an embodiment of the present invention, a computer program product is provided, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0017] According to another aspect of the embodiments of the present invention, a computer program is further provided. When the computer program is executed by a processor, the methods in the embodiments of the present invention are implemented.

[0018] In an embodiment of the present invention, the initial geological parameters of the area to be enhanced are obtained; based on the initial geological parameters, a surface fracturing area is determined from the surface enhanced permeability area, and based on the initial geological parameters, the surface fracturing parameters corresponding to the surface fracturing area are determined; based on the surface fracturing parameters, the surface fracturing area is enhanced to obtain a surface enhanced permeability result; based on the surface enhanced permeability result, an underground fracturing area is determined from the underground enhanced permeability area, and based on the surface enhanced permeability result, the underground fracturing parameters corresponding to the underground fracturing area are determined; based on the underground fracturing parameters, the underground fracturing area is enhanced to obtain a surface enhanced permeability result, by combining the surface fracturing operation with the underground fracturing operation, so that the surface fracturing area and the underground fracturing area have a complementary effect, so as to synergistically optimize the overall fracturing effect, further realize the global enhanced permeability of the coal seam, and achieve the purpose of large-scale fracturing at a lower economic cost, thereby achieving the technical effect of reducing the fracturing blank zone and expanding the coal seam enhanced permeability area, thereby solving the technical problem of poor coal seam enhanced permeability effect in related technologies. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 is a flow chart of a method for increasing the permeability of a coal seam according to an embodiment of the present invention;

[0021] Figure 2 is a schematic diagram of an optional surface vertical well location design according to an embodiment of the present invention;

[0022] Figure 3 is a schematic diagram of an optional surface microseismic arrangement scheme for surface vertical well fracturing according to an embodiment of the present invention;

[0023] Figure 4 is a schematic diagram of an optional directional long-hole staged fracturing according to an embodiment of the present invention;

[0024] Figure 5 is a schematic diagram of an optional downhole microseismic arrangement scheme for directional long-hole staged fracturing according to an embodiment of the present invention;

[0025] Figure 6 is a schematic diagram of an optional through-layer drilling pulsation fracturing according to an embodiment of the present invention;

[0026] Figure 7 is a schematic diagram of an optional downhole microseismic arrangement scheme for through-layer drilling pulsating fracturing according to an embodiment of the present invention;

[0027] Figure 8 is a detailed flow chart of a method for increasing the permeability of a coal seam according to an embodiment of the present invention;

[0028] Fig. 9 Schematic diagram of a coal seam permeability enhancement device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] According to an embodiment of the present invention, an embodiment of a coal seam permeability enhancement method is provided. It should be noted that the steps shown in the flowchart of the accompanying drawings can be executed in a computer system such as a set of computer executable instructions, and although a logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in an order different from that shown here.

[0032] Figure 1 is a flow chart of a method for increasing the permeability of a coal seam according to an embodiment of the present invention. Figure 1 As shown, the method comprises the following steps:

[0033] Step S102, obtaining initial geological parameters of the area to be enhanced, wherein the area to be enhanced includes: a surface enhanced permeability area and an underground enhanced permeability area, and the surface enhanced permeability area and the underground enhanced permeability area correspond to each other.

[0034] The above-mentioned area to be enhanced may refer to an area of ​​a particularly thick coal seam that currently needs to be enhanced. The above-mentioned initial geological parameters may be parameters reflecting the geological characteristics of the above-mentioned area to be enhanced, for example, the thickness of the coal seam, gas distribution, etc., but not limited thereto. The above-mentioned surface enhanced permeability area may refer to the enhanced permeability space range for the enhanced permeability operation from the ground. The above-mentioned underground enhanced permeability area may refer to the enhanced permeability space range for the enhanced permeability operation from underground.

[0035] In an optional embodiment, considering that the successful implementation of coal seam permeability enhancement depends on the accurate understanding of the geological characteristics of the area to be enhanced and its surrounding rock formations, the geological characteristics of the area to be enhanced will directly affect the quality of the coal seam permeability enhancement effect. Further considering that if only surface permeability enhancement or underground permeability enhancement is performed, the scope of action of the permeability enhancement project may be limited, thereby increasing the number of fracturing blank zones in the area to be enhanced, and then resulting in poor permeability enhancement effect in the area to be enhanced, therefore, the coal seam permeability enhancement system (hereinafter referred to as the permeability enhancement system) can perform ground and underground joint permeability enhancement for the area to be enhanced, so that the scope of action of the surface permeability enhancement and the underground permeability enhancement produce complementary effects, so as to expand the permeability enhancement area, thereby improving the permeability enhancement effect for the area to be enhanced. Specifically, the permeability enhancement system can obtain the initial geological parameters of the surface permeability enhancement area to accurately control the progress of the surface permeability enhancement project, thereby ensuring that the surface permeability enhancement effect meets the expected effect. At the same time, the permeability enhancement system can also obtain the initial geological parameters of the underground permeability enhancement area corresponding to the above-mentioned surface permeability enhancement area to accurately control the progress of the underground permeability enhancement project, thereby further improving the global permeability enhancement effect.

[0036] For example, in order to improve the permeability enhancement effect of the above-mentioned area to be enhanced, the permeability enhancement system can obtain the surface topography, distribution of constructed boreholes, characteristics and distribution of geological anomalies (faults, folds, collapse columns, old goafs, fire areas, etc.) in the ground permeability enhancement area based on geological data. The permeability enhancement system can also obtain geological characteristics such as coal seam burial depth, coal seam thickness, gas distribution, etc. in the underground permeability enhancement area based on geological data.

[0037] Step S104, based on the initial geological parameters, determining the ground fracturing area from the ground permeability enhancement area, and based on the initial geological parameters, determining the ground fracturing parameters corresponding to the ground fracturing area.

[0038] The above-mentioned surface fracturing area may be a surface space range for creating or expanding underground fractures, for example, it may be a surface vertical well design fracturing range, but is not limited thereto. The above-mentioned surface fracturing parameters may refer to a series of technical parameters that need to be set and controlled during the implementation of surface fracturing, for example, it may be a fracturing coverage range, a protection distance from a geological anomaly, but is not limited thereto.

[0039] In an optional embodiment, considering that the crack direction and expansion range of ground permeability enhancement are affected by geological conditions, by analyzing the above initial geological parameters, the formation direction and size of the cracks can be predicted and controlled to ensure that the cracks expand within the preset range of the ground fracturing area and avoid entering the non-fracturing area or geological anomaly, thereby improving the effect of ground fracturing and the safety of the operation. Therefore, the permeability enhancement system can determine the above ground fracturing area from the above ground permeability enhancement area based on the above initial geological parameters to determine that the operating range of the ground fracturing project meets the predetermined range, and determine the above ground fracturing parameters corresponding to the above ground fracturing area based on the above initial geological parameters to improve the operating effect of the ground fracturing project.

[0040] For example, in order to improve the effect of ground fracturing, the permeability enhancement system can determine the designed fracturing range of the ground vertical well based on the above initial geological parameters, so that the fracturing operation of the ground vertical well is carried out within the specified range. At the same time, the permeability enhancement system can also determine the ground fracturing parameters corresponding to the above fracturing range based on the above initial geological parameters. The above ground fracturing parameters can be as follows: the fracturing coverage range is set to be greater than or equal to 80m, and the protection distance between the geological anomaly body is set to be greater than or equal to 50m.

[0041] Step S106, enhancing the permeability of the surface fracturing area based on the surface fracturing parameters to obtain a surface enhancement result.

[0042] The above-mentioned ground permeability enhancement result may be the engineering operation effect after fracturing the above-mentioned ground fracturing area, as well as the geological parameters generated after fracturing.

[0043] In an optional embodiment, considering that the above-mentioned ground fracturing parameters directly determine the formation and expansion of cracks, and thus determine the permeability enhancement effect of the above-mentioned ground fracturing area, the permeability enhancement system can enhance the permeability of the ground fracturing area based on the above-mentioned ground fracturing parameters, so that the above-mentioned ground permeability enhancement results obtained meet engineering requirements and further obtain the geological parameters generated after the ground fracturing operation.

[0044] For example, the above-mentioned ground fracturing parameters may include: the fracturing coverage is set to be greater than or equal to 80m, and the protection distance between the fracturing and the geological anomaly is set to be greater than or equal to 50m, but it is not limited to this. In order to improve the effect and safety of ground fracturing, the permeability enhancement system can enhance the permeability of the ground fracturing area based on the above-mentioned ground fracturing parameters to ensure that the fracturing operation is carried out within a safe range, and can achieve directional control of the fracturing cracks to ensure that the cracks expand in the expected coal seam and avoid entering non-target areas or geological anomalies. Then, the permeability enhancement system can obtain the above-mentioned ground permeability enhancement results based on the above-mentioned permeability enhancement operation.

[0045] Step S108, based on the surface permeability enhancement result, determine the underground fracturing area from the underground permeability enhancement area, and based on the surface permeability enhancement result, determine the underground fracturing parameters corresponding to the underground fracturing area.

[0046] The underground fracturing area may be the underground space range where the fracturing operation is performed on the coal seam or reservoir. The underground fracturing parameters may be various technical parameters that need to be controlled and optimized in order to achieve the expected fracturing effect during the underground fracturing process, for example, the coal seam fracturing water injection volume, the fracturing radius, etc., but are not limited thereto.

[0047] In an optional embodiment, considering that surface fracturing may not be able to effectively control the expansion direction and position of cracks in the coal seam, resulting in poor permeability enhancement effect in some areas. Therefore, the permeability enhancement system can determine the underground fracturing area from the underground permeability enhancement area based on the above-mentioned surface permeability enhancement results and the geological parameters contained in the results, so that the underground fracturing area can produce a complementary effect with the above-mentioned surface fracturing area. At the same time, the permeability enhancement system can also determine the underground fracturing parameters corresponding to the above-mentioned underground fracturing area based on the above-mentioned surface permeability enhancement results, so that the underground fracturing operation can accurately target the above-mentioned underground fracturing area, thereby improving the operation effect of underground fracturing.

[0048] For example, the above-mentioned ground permeability enhancement result may be: the crack control accuracy of ground vertical well fracturing is limited, resulting in the permeability enhancement effect in some areas not meeting expectations, and there are small-scale blank areas within the coverage of ground vertical well fracturing. In order to improve the accuracy of underground fracturing, the permeability enhancement system can determine the following underground fracturing areas from the above-mentioned underground permeability enhancement areas based on the above-mentioned ground permeability enhancement results: small-scale blank areas within the coverage of ground vertical well fracturing. The permeability enhancement system can determine the following fracturing parameters corresponding to the above-mentioned underground fracturing areas based on the above-mentioned ground permeability enhancement results: the coal seam fracturing water injection volume is increased to 100 cubic meters, and the fracturing radius is set to 30 meters, thereby further improving the effect of underground fracturing.

[0049] It should be noted that the above-mentioned values ​​of coal seam fracturing water injection volume and fracturing radius are only exemplary. The staff can set them according to actual needs and are not limited here.

[0050] Step S110, enhancing the permeability of the underground fracturing area based on the underground fracturing parameters.

[0051] In an optional embodiment, considering that the above-mentioned underground fracturing parameters are obtained based on the above-mentioned ground permeability enhancement results, the parameters can accurately locate the underground permeability enhancement needs according to the ground permeability enhancement results, directly determine the degree of improvement of the ground permeability enhancement effect, and then determine the permeability enhancement effect of the entire area to be enhanced. Therefore, the detection system can enhance the permeability of the underground fracturing area based on the underground fracturing parameters, thereby improving the overall permeability enhancement effect of the coal seam.

[0052] For example, the underground fracturing parameters may be: the coal seam fracturing water injection volume is increased to 100 cubic meters, and the fracturing radius is set to 30 meters. In order to improve the surface permeability enhancement effect, the permeability enhancement system can perform directional long-hole segmented fracturing and through-layer drilling pulsation fracturing operations on the underground fracturing area based on the underground fracturing parameters, thereby ensuring that the fracturing operation meets the design requirements and optimizes the overall permeability enhancement effect.

[0053] It should be noted that the above-mentioned values ​​of coal seam fracturing water injection volume and fracturing radius are only exemplary. The staff can set them according to actual needs and are not limited here.

[0054] In an embodiment of the present invention, the initial geological parameters of the area to be enhanced are obtained; based on the initial geological parameters, a surface fracturing area is determined from the surface enhanced permeability area, and based on the initial geological parameters, the surface fracturing parameters corresponding to the surface fracturing area are determined; based on the surface fracturing parameters, the surface fracturing area is enhanced to obtain a surface enhanced permeability result; based on the surface enhanced permeability result, an underground fracturing area is determined from the underground enhanced permeability area, and based on the surface enhanced permeability result, the underground fracturing parameters corresponding to the underground fracturing area are determined; based on the underground fracturing parameters, the underground fracturing area is enhanced to obtain a surface enhanced permeability result, by combining the surface fracturing operation with the underground fracturing operation, so that the surface fracturing area and the underground fracturing area have a complementary effect, so as to synergistically optimize the overall fracturing effect, further realize the global enhanced permeability of the coal seam, and achieve the purpose of large-scale fracturing at a lower economic cost, thereby achieving the technical effect of reducing the fracturing blank zone and expanding the coal seam enhanced permeability area, thereby solving the technical problem of poor coal seam enhanced permeability effect in related technologies.

[0055] Furthermore, the initial geological parameters include: ground obstacle parameters, which are used to reflect the obstacle conditions on the ground in the area to be enhanced permeability; based on the initial geological parameters, determining the ground fracturing area from the ground enhanced permeability area, including: obtaining the well location design conditions of the ground vertical well, wherein the ground vertical well is used to perform enhanced permeability treatment on the ground for the ground fracturing area; based on the ground obstacle parameters, selecting the ground fracturing area that matches the well location design conditions from the ground enhanced permeability area.

[0056] The above-mentioned ground obstacle parameters may refer to the characteristics and positions of various obstacles in the surface and near-surface environment that need to be considered when performing ground fracturing operations. For example, the above-mentioned ground obstacle parameters may include at least one or more of the following: fracturing coverage, original borehole protection distance, protection distance from geological anomalies (faults, folds, old goafs, etc.), surface undulations, etc., but are not limited thereto. The above-mentioned well location design conditions may be design conditions for ensuring that the permeability enhancement effect of the above-mentioned ground vertical wells meets the expected effect.

[0057] In an optional embodiment, considering that the surface fracturing operation may be affected by various surface obstacles, the permeability enhancement system needs to determine the surface fracturing area in combination with the surface obstacles to improve the surface permeability enhancement effect. Therefore, the initial geological parameters may include surface obstacle parameters, which may reflect the obstacle conditions in the area to be permeated. The permeability enhancement system may further obtain the well location design conditions of the surface vertical well, which is used to perform permeability enhancement treatment on the surface fracturing area. Since the surface obstacle parameters can affect the effect and safety of the fracturing operation, the permeability enhancement system may select the surface fracturing area that matches the well location design conditions from the surface permeability enhancement area based on the surface obstacle parameters, so as to perform the surface fracturing operation more accurately and safely.

[0058] For example, in order to improve the effect of ground fracturing, the permeability enhancement system can first obtain the ground obstacle parameters. Assuming that the above-mentioned ground obstacle parameters are as follows: fracturing coverage ≥ 80m, protection distance from the original borehole ≥ 10m, protection distance from the geological anomaly ≥ 50m, and small surface undulation, the above-mentioned ground obstacle parameters can control the accurate implementation of the ground fracturing operation. Then, the permeability enhancement system can obtain the well location design conditions of the above-mentioned ground vertical wells. Assuming that the above-mentioned well location design conditions are as follows: a flat and obstacle-free ground is required to facilitate the deployment of ground vertical wells and the implementation of ground fracturing operations. Finally, based on the above-mentioned ground obstacle parameters, the permeability enhancement system can select a ground fracturing area from the ground permeability enhancement area that matches the above-mentioned well location design conditions and can safely and economically implement ground fracturing operations.

[0059] It should be noted that the values ​​of the above-mentioned parameters such as the fracturing coverage range and the original drilling protection distance are only exemplary. The staff can set them according to actual needs and are not limited here.

[0060] For ease of understanding, Figure 2 is a schematic diagram of an optional ground vertical well location design according to an embodiment of the present invention, such as Figure 2 As shown, 202 represents a vertical well on the ground, 204 represents a geological anomaly, 206 represents a designed fracturing range of the vertical well on the ground, 208 represents a bottom plate tunnel, 210 represents a fault, and 212 represents an original borehole. The above-mentioned well location design conditions may include: fracturing coverage, protection distance from the original borehole, protection distance from the geological anomaly, and fault conditions. The permeability enhancement system may select multiple ground fracturing areas matching the above-mentioned well location design conditions from the ground permeability enhancement area based on the above-mentioned well location design conditions. The above-mentioned ground fracturing areas may be located on both sides of the bottom plate tunnel. The permeability enhancement system may further deploy the above-mentioned vertical well on the ground in the above-mentioned multiple ground fracturing areas, thereby improving the fracturing effect of ground fracturing.

[0061] Furthermore, the area to be permeable increased contains coal seam resources, and the initial geological parameters also include: coal seam mechanical parameters of the coal seam resources, and coal seam permeability parameters of the coal seam resources, the coal seam mechanical parameters are used to reflect the mechanical properties of the coal seam resources in the area to be permeable increased, and the coal seam permeability parameters are used to reflect the physical properties and rock properties of the coal seam resources in the area to be permeable increased; based on the initial geological parameters, the ground fracturing parameters corresponding to the ground fracturing area are determined, including: based on the coal seam mechanical parameters, determining the expected fracturing pressure of the area to be permeable increased; based on the coal seam permeability parameters, determining the first influencing parameter of the coal seam resources; based on the first influencing parameter, determining the expected fracturing water injection volume of the area to be permeable increased according to a preset formula; based on the expected fracturing pressure and the expected fracturing water injection volume, constructing the ground fracturing parameters.

[0062] The above-mentioned coal seam mechanical parameters may be parameters used to describe the mechanical properties of the coal seam resources in the above-mentioned permeability enhancement area. For example, the above-mentioned coal seam mechanical parameters may include at least one or more of the following: uniaxial and triaxial compressive strength of coal rock, elastic modulus, Poisson's ratio and tensile strength, but not limited to this. The above-mentioned coal seam permeability parameters may be parameters used to describe the physical properties and rock properties of the coal seam resources in the area to be permeable. For example, the above-mentioned coal seam permeability parameters may include at least one or more of the following: coal body permeability, porosity, top and bottom plate lithology, but not limited to this. The above-mentioned expected fracturing pressure may refer to the minimum pressure required to form the first crack in the coal seam during the fracturing process. The above-mentioned first influencing parameter may be a parameter used to calculate the above-mentioned expected fracturing water injection volume. For example, the above-mentioned first influencing parameter may include at least one or more of the following: influencing body volume, fracturing radius, coal seam thickness, coal seam volume in the fracturing influence range, water absorption coefficient of top and bottom plate rock layers, and water absorption coefficient when the coal seam is hard, but not limited to this. The above-mentioned preset formula may be a formula used to calculate the above-mentioned expected fracturing water injection volume. For example, the above-mentioned preset formula may be as shown below:

[0063] v 体 =πr 2 h;

[0064] v 水 =0.002v 体 λ 1 λ 2 .

[0065] In the above formula, v 体 represents the volume of coal seam within the range of fracturing, in cubic meters; π is the pi; r is the fracturing radius, in meters; h is the thickness of the coal seam, in meters; v 水 Indicates the amount of fracturing water, in cubic meters; 1 is the water absorption coefficient of the top and bottom rock layers, for example, λ 1 The value can be 1, but is not limited to this; 2is the density of the coal seam, that is, the water absorption coefficient when the coal seam is hard, for example, λ 2 The value can be 0.1, but is not limited to this.

[0066] The expected fracturing water injection volume may refer to the total volume of fluid (usually water-based fluid) that needs to be injected into the coal seam during the surface fracturing operation.

[0067] In an optional embodiment, considering that the area to be permeable is also composed of coal seam resources, it is necessary to consider the mechanical properties and geological properties of the above-mentioned coal seam resources, so as to more completely construct the above-mentioned initial geological parameters, thereby more accurately controlling the progress of the surface fracturing operation. Therefore, the above-mentioned initial geological parameters may also include the coal seam mechanical parameters and coal seam permeability parameters of the above-mentioned coal seam resources. Further, the permeability enhancement system may determine the expected fracturing pressure of the above-mentioned area to be permeable based on the above-mentioned coal seam mechanical parameters, so as to improve the accuracy of the surface fracturing operation, and avoid the wellbore damage caused by excessive pressurization in the surface fracturing operation. At the same time, the permeability enhancement system may also determine the first influencing parameter of the coal seam resources based on the above-mentioned coal seam permeability parameters, so as to improve the accuracy of the calculation of the above-mentioned expected fracturing water injection volume. Then, the permeability enhancement system may calculate the expected fracturing water injection volume of the above-mentioned area to be permeable based on the above-mentioned first influencing parameter according to the above-mentioned preset formula. Finally, the permeability enhancement system may construct the surface fracturing parameters based on the above-mentioned expected fracturing pressure and the above-mentioned expected fracturing water injection volume, so as to ensure the accuracy and safety of the surface fracturing operation.

[0068] For example, the above-mentioned coal seam mechanical parameters may include uniaxial and triaxial compressive strength, elastic modulus, Poisson's ratio and tensile strength of coal rock. In order to accurately construct the ground fracturing parameters, thereby improving the effect of ground fracturing operations, the permeability enhancement system can first obtain the initial geological parameters including the above-mentioned coal seam mechanical parameters and, then, the permeability enhancement system can further calculate the expected fracturing pressure of the area to be permeated based on the above-mentioned coal seam mechanical parameters by the following formula:

[0069] P k =3σ h -σ H +σ t -P 0 .

[0070] All mechanical parameters in the above formula are interpreted as follows: P k is the coal seam fracture initiation pressure, σ h is the minimum principal stress, σ H is the maximum principal stress, σ t is the tensile strength, P 0 is the pore pressure. The unit of all mechanical parameters in the above formula is MPa.

[0071] At the same time, the permeability enhancement system can further determine the above-mentioned first parameter based on the above-mentioned coal seam permeability parameters. The above-mentioned first parameter may include: the volume of the affected body, the fracturing radius, the coal seam thickness, the volume of the coal seam within the fracturing influence range, the water absorption coefficient of the top and bottom rock layers, and the water absorption coefficient of the coal seam when it is hard. The permeability enhancement system can calculate the expected fracturing water injection volume of the area to be permeated based on the above-mentioned first parameter through the above-mentioned preset formula. Finally, the permeability enhancement system can construct the ground fracturing parameters based on the above-mentioned expected fracturing pressure and the above-mentioned expected fracturing water injection volume to more accurately control the ground fracturing operation, thereby improving the effect and safety of ground fracturing.

[0072] Furthermore, the surface permeability enhancement result includes: the coal seam length of the coal seam resources, and the first actual fracturing area generated when the surface permeability enhancement area is enhanced, and the underground fracturing area includes: multiple segmented fracturing areas; based on the surface permeability enhancement result, the underground fracturing area is determined from the underground permeability enhancement area, including: obtaining the first drilling condition of the directional long borehole, wherein the directional long borehole is used to perform permeability enhancement treatment on multiple segmented fracturing areas underground, and the directional long borehole is deployed in a vertical well on the surface; based on the coal seam length and the actual fracturing area, multiple segmented fracturing areas matching the first drilling condition are selected from the underground fracturing area.

[0073] The above-mentioned coal seam length may refer to the extension length of the coal seam along the strike direction at a certain level on the surface or underground. The above-mentioned first actual fracturing area may be the spatial range that produces the actual permeability enhancement effect when the above-mentioned ground permeability enhancement area is enhanced. The above-mentioned segmented fracturing area may be a plurality of fracturing treatment sections obtained by dividing the target coal seam or rock formation. For example, the above-mentioned segmented fracturing area may be a directional long borehole fracturing area, but is not limited to this. The above-mentioned first drilling condition may be a condition for selecting the above-mentioned directional long borehole fracturing area. For example, the above-mentioned first drilling condition may include at least one or more of the following: a long borehole coal seam section, a fracturing distance of each section of the segmented fracturing, a segment interval of the segmented fracturing, and a fracturing radius, but is not limited to this.

[0074] In an optional embodiment, considering that the thickness of the coal seam may be high, if the whole coal seam section is fractured at one time, the expansion of the cracks may not be accurately controlled, which may easily cause the cracks to over-expand in some areas and insufficiently expand in other areas, resulting in poor permeability enhancement effect of the coal seam. Therefore, it is necessary to carry out the design of underground directional long drilling segmented fracturing to optimize the underground fracturing effect. The above-mentioned ground permeability enhancement result may include the coal seam length of the coal seam resource, and the first actual fracturing area generated when the ground permeability enhancement area is enhanced, that is, the area where the fracturing effect is actually generated when the ground permeability enhancement area is enhanced. The permeability enhancement system can further obtain the first drilling condition of the above-mentioned directional long drilling to control the directional long drilling deployed under the ground vertical well to perform fracturing operations. Then, based on the above-mentioned coal seam length and the above-mentioned actual fracturing area, the permeability enhancement system can select multiple segmented fracturing areas that match the above-mentioned first drilling condition from the underground fracturing area, so that the directional long drilling can perform permeability enhancement treatment on the above-mentioned multiple segmented fracturing areas, thereby improving the permeability enhancement effect of the coal seam.

[0075] For example, the permeability enhancement system has obtained the above-mentioned ground permeability enhancement results. In order to more accurately control the fracturing operation and ensure that each fracturing section can form an effective fracture network, the permeability enhancement system can analyze the coal seam length of the coal seam resources as 1000 meters based on the above-mentioned ground permeability enhancement results. At the same time, the permeability enhancement system can carry out ground microseismic monitoring around the wellhead of the above-mentioned ground vertical well, so as to obtain that when the ground vertical well performs permeability enhancement on the ground permeability enhancement area, the first actual fracturing area generated is 100 square meters, accounting for 80% of the above-mentioned ground fracturing area, that is, there is a partially uncovered area for ground fracturing. Then, based on the above-mentioned ground permeability enhancement results, the permeability enhancement system can further perform the following analysis to determine the first drilling condition of the above-mentioned directional long borehole: based on the coal seam length of 1000 meters, taking into account the possible heterogeneity inside the coal seam, the coal seam is divided into multiple sections, wherein the long borehole coal seam section is greater than 200 meters, and the fracturing distance of each section is determined to be 20 to 30 meters according to the coal seam structure, the section interval is 10 to 20 meters, and the fracturing radius is set to 20 to 30 meters. Finally, based on the above-mentioned coal seam length and the above-mentioned actual fracturing area, the permeability enhancement system can select the coal seam section in the underground fracturing area that matches the above-mentioned first drilling condition as the target area for the above-mentioned segmented fracturing to supplement the area not covered by the ground fracturing, thereby improving the overall fracturing effect.

[0076] It should be noted that the values ​​of the above-mentioned coal seam length, first actual fracturing area and other parameters are only exemplary. The staff can set them according to actual needs and are not limited here.

[0077] For ease of understanding, Figure 3 FIG. 1 is a schematic diagram of an optional surface microseismic arrangement scheme for surface vertical well fracturing according to an embodiment of the present invention. Figure 3As shown, 302 represents a circle with a radius of 100 meters, 304 represents a circle with a radius of 200 meters, 306 represents a circle with a radius of 300 meters, 308 is the wellhead position of the ground vertical well, 302, 304 and 306 form concentric circles with 308 as the center, and 310 is a microseismic sensor deployment point. The anti-permeability system can deploy a ground microseismic monitoring network according to the above concentric circles with radii of 100 meters, 200 meters, and 300 meters, and select multiple microseismic sensor deployment points in the above microseismic monitoring network to deploy multiple microseismic sensors, so that the anti-permeability system can carry out ground microseismic monitoring around the wellhead of the ground vertical well, thereby obtaining the actual fracturing range of the ground well.

[0078] It should be noted that the values ​​of the above-mentioned multiple concentric circle radii are only exemplary. The staff can set them according to actual needs and are not limited here.

[0079] Furthermore, the ground permeability enhancement results also include: the first permeability parameter of the coal seam resources when the ground vertical well is operating, and the underground fracturing parameters include: the first fracturing parameter of the directional long drilling hole; based on the ground permeability enhancement results, the underground fracturing parameters corresponding to the underground fracturing area are determined, including: based on the first permeability parameter, the second influencing parameter of the coal seam resources is determined; based on the second influencing parameter, the first fracturing water injection volume of the area to be permeable is determined according to a preset formula; based on the first fracturing water injection volume and the first preset fracturing parameter, the first fracturing parameter is constructed.

[0080] The first permeability parameter may be a parameter describing the change in the permeability of the coal seam in the area where the directional long borehole fracturing is to be performed, for example, it may be the coal body permeability, porosity, and top and bottom plate lithology, but not limited thereto. The first fracturing parameter may be a parameter used to control the fracturing operation of the directional long borehole. The second influencing parameter may be a parameter used to calculate the first fracturing water injection volume of the above-mentioned area to be permeable, for example, the second influencing parameter may include at least one or more of the following: the volume of the influencing body, the fracturing radius, the thickness of the coal seam, the volume of the coal seam in the fracturing influence range, the water absorption coefficient of the top and bottom plate rock formations, and the water absorption coefficient when the coal seam is hard, but not limited thereto. The first fracturing water injection volume may be the directional long borehole segmented fracturing water injection volume. The first preset fracturing parameter may be a pre-set parameter used to plan the scope of the directional long borehole fracturing operation, for example, the first preset fracturing parameter may include at least one or more of the following: the fracturing distance of each segment is set to 20 to 30 meters, the segment interval is set to 10 to 20 meters, and the fracturing radius is set to 20 to 30 meters, but not limited thereto.

[0081] In an optional embodiment, considering that the above-mentioned directional long drilling needs to be used to form and expand cracks in the coal seam during the permeability enhancement process to increase the permeability of the coal seam, different directional long drilling parameter settings will lead to different crack distributions and fracturing costs. The above-mentioned underground fracturing parameters may include the first fracturing parameters of the directional long drilling, which can be used to control the above-mentioned directional long drilling for fracturing operations. Therefore, the permeability enhancement system needs to construct the above-mentioned first fracturing parameters more accurately to improve the fracturing efficiency and control the fracturing cost. The permeability enhancement system can first analyze the first permeability parameter of the coal seam resources when the ground vertical well is running based on the above-mentioned ground permeability enhancement results, and the parameter can describe the change in the permeability of the coal seam. Then, the permeability enhancement system can further determine the second influencing parameter of the coal seam resources based on the above-mentioned first permeability parameter, and based on the above-mentioned second influencing parameter, calculate the directional long drilling segmented fracturing water injection volume of the area to be permeated according to the above-mentioned preset formula, that is, the above-mentioned first fracturing water injection volume. Finally, the permeability enhancement system can construct the first fracturing parameter based on the above-mentioned first fracturing water injection volume and the above-mentioned first preset fracturing parameter, so as to ensure that the above-mentioned first fracturing parameter has a high accuracy.

[0082] For example, the first preset fracturing parameters can be: the distance of each fracturing section is set to 20 to 30 meters, the section interval is set to 10 to 20 meters, and the fracturing radius is set to 20 to 30 meters. In order to accurately construct the first fracturing parameters, the permeability enhancement system can first analyze the first permeability parameters of the coal seam resources during the operation of the ground vertical well based on the above-mentioned ground permeability enhancement results as follows: the coal body permeability is 0.1 millidarcy and the porosity is 5%. Then, the permeability enhancement system can further determine the second influencing parameters of the coal seam resources based on the above-mentioned first permeability parameters as follows: the fracturing radius is 25 meters, the coal seam thickness is 10 meters, and the water absorption coefficient of the top and bottom plate rock layers is λ. 1 is 1, coal seam density coefficient λ 2 is 0.1. Based on the second influencing parameter, the permeability enhancement system can calculate the directional long borehole staged fracturing water injection volume according to the formula to be approximately 3.92699 cubic meters. Finally, the permeability enhancement system can construct the first fracturing parameter based on the directional long borehole staged fracturing water injection volume and the first preset fracturing parameter. The constructed first fracturing parameter can be as follows: the fracturing distance of each section of the directional long borehole is 25 meters, the section interval is 15 meters, the fracturing radius is 25 meters, and the directional long borehole staged fracturing water injection volume is 3.92699 cubic meters.

[0083] It should be noted that the values ​​of the above-mentioned parameters such as each fracturing distance, segment interval, fracturing radius, coal permeability, etc. are only exemplary displays. The staff can set them according to actual needs and are not limited here.

[0084] For ease of understanding, Figure 4 is a schematic diagram of an optional directional long-hole staged fracturing according to an embodiment of the present invention, such as Figure 4 As shown, 402 represents a directional long borehole, and 404 represents the actual fracturing range of the ground vertical well. Based on the above-mentioned coal seam length and the actual fracturing range of the ground vertical well, the anti-permeability system can select multiple coal seam sections matching the above-mentioned first drilling condition from the underground fracturing area, and take the bottom plate lane as the starting point to perform directional long borehole fracturing operations on the above-mentioned multiple coal seam sections to form multiple directional long boreholes, thereby achieving a complementary effect with the ground vertical well fracturing range.

[0085] Furthermore, the underground fracturing area also includes: multiple pulsating fracturing areas, and the underground fracturing parameters also include: a second fracturing parameter corresponding to the downhole permeable drilling hole, the downhole permeable drilling hole is used to perform permeability enhancement treatment on the multiple pulsating fracturing areas underground, and the downhole permeable drilling hole corresponds to the directional long drilling hole; based on the ground permeability enhancement result, the underground fracturing area is determined from the underground permeability enhancement area, including: in response to the start of the directional long drilling hole, obtaining the second actual fracturing area corresponding to the directional long drilling hole, and the second permeability parameter corresponding to the coal seam resources; obtaining the second drilling condition of the downhole permeable drilling hole; based on the first actual fracturing area and the second actual fracturing area, selecting multiple pulsating fracturing areas matching the second drilling condition from the underground fracturing area; constructing the second fracturing parameter based on the second permeability parameter.

[0086] The above-mentioned pulsating fracturing area may be a specific area where the pulsating fracturing method is used to increase the permeability of the coal seam, for example, it may be a downhole through-layer drilling fracturing area, but it is not limited to this. The above-mentioned second fracturing parameter may be a parameter used to control the fracturing operation of the above-mentioned downhole through-layer drilling. The above-mentioned second actual fracturing area may refer to the spatial range in which the actual permeability increase effect is produced when the above-mentioned directional long drilling increases the permeability of the above-mentioned segmented fracturing area. The above-mentioned second permeability parameter may be a parameter that describes the change in the permeability of the coal seam in the downhole through-layer drilling fracturing area, for example, it may be the permeability, porosity, and top and bottom plate lithology of the coal body. The above-mentioned second drilling condition may be a condition for selecting the above-mentioned downhole through-layer drilling fracturing area, for example, the above-mentioned second drilling condition may include at least one or more of the following: area size, whether the above-mentioned first drilling condition is met, but it is not limited to this.

[0087] In an optional embodiment, considering that in the process of global permeability enhancement, there may be areas that are difficult to reach by ground vertical well fracturing and underground directional long borehole fracturing, such as interlayers in coal seams, near geological anomalies or at the edge of coal seams, the above-mentioned areas may not be effectively enhanced by conventional fracturing methods due to distance, structural complexity or changes in coal seam properties. Therefore, the permeability enhancement system needs to accurately locate the underground through-layer drilling fracturing area so that the underground through-layer drilling fracturing covers the above-mentioned difficult-to-reach areas. The permeability enhancement system can first obtain the second actual fracturing area corresponding to the directional long borehole, which can describe the actual range of action of the directional long borehole, thereby assisting the permeability enhancement system in determining the above-mentioned pulsating fracturing area. At the same time, the permeability enhancement system can also obtain the second permeability parameter corresponding to the coal seam resources, which can describe the parameters of the change in coal seam permeability in the underground through-layer drilling fracturing area. Then, the permeability enhancement system can further obtain the second drilling condition of the underground through-layer drilling hole, and based on the first actual fracturing area and the second actual fracturing area, select multiple pulsating fracturing areas that match the second drilling condition from the underground fracturing area, so as to accurately determine the fracturing area of ​​the underground through-layer drilling hole. Finally, the permeability enhancement system can construct a second fracturing parameter based on the second permeability parameter to control the fracturing operation of the underground through-layer drilling hole, and accurately target the fracturing area of ​​the underground through-layer drilling hole.

[0088] For example, in order to accurately determine the underground through-layer drilling fracturing area, the permeability enhancement system can first arrange underground microseismic monitoring at a spacing of 20m in the area of ​​the bottom plate tunnel of the directional long borehole closest to the fracturing range, so as to obtain the second actual fracturing area corresponding to the directional long borehole. At the same time, the permeability enhancement system can obtain the second permeability parameter corresponding to the coal seam resource based on the fracturing operation results of the directional long borehole. The above-mentioned second actual fracturing area shows that the actual effective range of the directional long borehole is 50 square meters, and other areas do not have the conditions for directional long drilling construction. Then, the permeability enhancement system can further determine the second drilling condition of the underground through-layer drilling: the size of the area to be fractured is not more than 20 meters, and it does not have the conditions for directional long drilling construction. Subsequently, the permeability enhancement system can accurately determine multiple underground through-layer drilling fracturing areas from the underground fracturing area based on the above-mentioned second drilling condition. Finally, in order to achieve precise control of the downhole perforating boreholes so that the fracturing operation of the downhole perforating boreholes can accurately act on the above-mentioned multiple downhole perforating borehole fracturing areas, the permeability enhancement system can construct the second fracturing parameter based on the above-mentioned second permeability parameter.

[0089] It should be noted that the values ​​of multiple parameters such as the actual range of the above-mentioned directional long drilling, the size of the area to be fractured, etc. are only exemplary displays. The staff can set them according to actual needs and are not limited here.

[0090] For ease of understanding, Figure 5Schematic diagram of an optional downhole microseismic arrangement scheme for directional long-hole staged fracturing according to an embodiment of the present invention, as shown in FIG. Figure 5 As shown, the multiple rectangular boxes in the figure all represent the staged fracturing range, 504 represents the No. 1 directional long borehole, 506 represents the No. 2 directional long borehole, 508 represents the bottom plate roadway, and 510 represents the downhole microseismic sensor layout point. The anti-permeability system can select multiple downhole microseismic layout points at a spacing of 20 meters near the bottom plate roadway of the directional long borehole, and the anti-permeability system can deploy microseismic sensors based on the above multiple downhole microseismic sensor layout points, so as to ensure that all data related to the directional long borehole fracturing effect can be collected, and the anti-permeability system can determine the actual fracturing area of ​​the above directional long borehole based on the above data.

[0091] It should be noted that the values ​​of the spacing between the above-mentioned microseismic arrangement points are only exemplary, and the staff can set them according to actual needs, and are not limited here.

[0092] Furthermore, constructing a second fracturing parameter based on the second permeability parameter includes: determining a third influencing parameter of coal seam resources based on the second permeability parameter; determining a second fracturing water injection volume of the area to be permeable according to a preset formula based on the third influencing parameter; constructing a second fracturing parameter based on the second fracturing water injection volume and the second preset parameter.

[0093] The third influencing parameter may be a parameter used to calculate the second fracturing water injection volume of the above-mentioned area to be permeable. For example, the third influencing parameter may include at least one or more of the following: the volume of the influencing body, the fracturing radius, the thickness of the coal seam, the volume of the coal seam in the fracturing influence range, the water absorption coefficient of the top and bottom rock layers, and the water absorption coefficient of the coal seam when it is hard, but not limited to this. The second fracturing water injection volume may be the pulsating fracturing water injection volume of the through-layer drilling. The second preset parameter may be a pre-set parameter used to plan the scope of the above-mentioned downhole through-layer drilling fracturing operation. For example, the fracturing radius may be set to 20 to 30 meters, but not limited to this.

[0094] In an optional embodiment, considering that the permeability enhancement system needs to achieve precise control of the underground permeable drilling holes, and the above-mentioned underground fracturing parameters can also include the second fracturing parameters corresponding to the underground permeable drilling holes, which can be used to control the fracturing operation of the above-mentioned underground permeable drilling holes, therefore, the permeability enhancement system needs to construct the above-mentioned second fracturing parameters more accurately to improve the overall effect of global permeability enhancement. The permeability enhancement system can determine the third influencing parameter of the above-mentioned coal seam resources based on the above-mentioned second permeability parameter, and calculate the permeable drilling hole pulsating fracturing water injection volume according to the above-mentioned preset formula based on the above-mentioned third influencing parameter, that is, the above-mentioned second fracturing water injection volume. Then, the permeability enhancement system can further construct the second fracturing parameters based on the above-mentioned second fracturing water injection volume and the above-mentioned second preset parameters, so as to ensure that the above-mentioned second fracturing parameters have a higher accuracy.

[0095] For example, the second preset parameter may be that the fracturing radius is set to 20 to 30 meters, and the second permeability parameter may be that the coal body permeability is 0.05 millidarcy and the porosity is 2%. In order to accurately construct the second fracturing parameter, the permeability enhancement system may first determine the third influencing parameter of the coal seam resource based on the second permeability parameter. The third influencing parameter may be as follows: the fracturing radius is 20 meters, the coal seam thickness is 5 meters, and the water absorption coefficient of the top and bottom rock layers is λ. 1 is 1, coal seam density coefficient λ 2 is 0.1. Based on the third influencing parameter, the permeability enhancement system can calculate the permeability enhancement system according to the formula to be approximately 1.256636 cubic meters of water injection for the permeable borehole pulsating fracturing. Finally, the permeability enhancement system can further construct the second fracturing parameter based on the second fracturing water injection volume and the second preset parameter. The second fracturing parameter can be as follows: the fracturing radius is 20 meters, and the permeability enhancement system can be 1.256636 cubic meters of water injection for the permeable borehole pulsating fracturing.

[0096] It should be noted that the values ​​of the above-mentioned parameters such as fracturing radius, coal permeability, porosity, etc. are only exemplary. The staff can set them according to actual needs and are not limited here.

[0097] For ease of understanding, Figure 6 Schematic diagram of an optional through-layer drilling pulsation fracturing according to an embodiment of the present invention, such as Figure 6 As shown, 602 represents the through-layer drilling. The anti-permeability system can select multiple downhole through-layer drilling fracturing areas from the underground fracturing area based on the second drilling condition, and perform downhole through-layer drilling fracturing operations on the downhole through-layer drilling fracturing areas to make up for the blank areas that may be left by the ground vertical well and the downhole directional long drilling fracturing.

[0098] It should be noted that in order to integrate the actual fracturing effect of the global permeability enhancement based on the actual fracturing range of the above-mentioned ground vertical wells, the actual fracturing range of the directional long borehole and the actual fracturing range of the downhole through-layer borehole, the permeability enhancement system can obtain the actual fracturing range of the through-layer borehole based on the above-mentioned downhole microseismic monitoring scheme. Figure 7 Schematic diagram of an optional downhole microseismic arrangement scheme for through-layer drilling pulsating fracturing according to an embodiment of the present invention, as shown in FIG. Figure 7 As shown, 702 represents the pulsating fracturing range, and 704 represents the through-layer drilling. The anti-permeability system can deploy microseismic sensors based on the above-mentioned multiple downhole microseismic sensor arrangement points, so as to ensure that all data related to the fracturing effect of the downhole through-layer drilling can be collected. The anti-permeability system can determine the pulsating fracturing range of the downhole through-layer drilling based on the above-mentioned data, so that the anti-permeability system can further analyze the global anti-permeability effect.

[0099] For ease of understanding, Figure 8 is a detailed flow chart of a coal seam permeability enhancement method according to an embodiment of the present invention, such as Figure 8 As shown, the permeability enhancement system can first collect geological data in the expected fracturing area, and then, the permeability enhancement system can design ground vertical well fracturing based on the above collected data. Specifically, the permeability enhancement system can design the well location based on the above collected data, and then, design the construction parameters of ground vertical well fracturing for the above well location. On-site construction personnel can perform on-site construction based on the construction parameters of ground vertical well fracturing determined by the above steps. Finally, the permeability enhancement system can determine the fracturing range of ground vertical well fracturing to determine the actual fracturing range of the vertical well fracturing.

[0100] Furthermore, based on the construction effect of the above-mentioned ground vertical well fracturing, the permeability enhancement system can carry out the design of downhole directional long borehole segmented fracturing. Specifically, the permeability enhancement system can determine the area of ​​downhole directional long borehole segmented fracturing based on the actual fracturing range of the above-mentioned ground vertical well fracturing, thereby determining the construction area where downhole directional long borehole segmented fracturing is required. Then the permeability enhancement system can design construction parameters for the construction area of ​​the above-mentioned directional long borehole segmented fracturing. On-site construction personnel can carry out on-site construction based on the construction parameters of the directional long borehole segmented fracturing determined in the above steps. Finally, the permeability enhancement system can determine the fracturing range of the directional long borehole segmented fracturing to determine the actual fracturing range of the directional long borehole segmented fracturing.

[0101] Furthermore, based on the construction effect of the above-mentioned directional long borehole segmented fracturing, the permeability enhancement system can design downhole through-hole pulsating fracturing. Specifically, the permeability enhancement system can determine the area of ​​downhole through-hole pulsating fracturing based on the actual fracturing range of the above-mentioned directional long borehole segmented fracturing, thereby determining the construction area where downhole through-hole pulsating fracturing is required. Then the permeability enhancement system can design construction parameters for the construction area of ​​the above-mentioned downhole through-hole pulsating fracturing. On-site construction personnel can carry out on-site construction based on the construction parameters of downhole through-hole pulsating fracturing determined in the above steps. Finally, the permeability enhancement system can determine the fracturing range of downhole through-hole pulsating fracturing to determine the actual fracturing range of the directional long borehole segmented fracturing. At this time, the permeability enhancement system completes the full-area permeability enhancement process, so that the fracturing ranges of the ground and downhole measures produce complementary effects, which not only realizes large-scale fracturing at a lower economic cost, but also realizes directional control of the fracturing range.

[0102] According to an embodiment of the present invention, an embodiment of a coal seam permeability enhancement device is provided. It should be noted that the device can be used to perform the above-mentioned coal seam permeability enhancement method. The specific implementation method and application scenario are the same as those of the above-mentioned embodiment, and will not be described in detail here. Fig. 9 Schematic diagram of a coal seam permeability enhancement device according to an embodiment of the present invention. Fig. 9As shown, the device comprises:

[0103] The parameter acquisition module 902 is used to acquire initial geological parameters of the area to be enhanced, wherein the area to be enhanced includes: a surface enhanced permeability area and an underground enhanced permeability area, and the surface enhanced permeability area and the underground enhanced permeability area are opposite to each other.

[0104] The first determination module 904 is used to determine a ground fracturing area from a ground permeability enhancement area based on initial geological parameters, and determine ground fracturing parameters corresponding to the ground fracturing area based on the initial geological parameters.

[0105] The first anti-reflection module 906 is used to enhance the transmittance of the ground fracturing area based on the ground fracturing parameters to obtain a ground anti-reflection result.

[0106] The second determination module 908 is used to determine the underground fracturing area from the underground fracturing area based on the surface anti-permeability result, and determine the underground fracturing parameters corresponding to the underground fracturing area based on the surface anti-permeability result.

[0107] The second anti-permeability module 910 is used to enhance the permeability of the underground fracturing area based on the underground fracturing parameters.

[0108] Furthermore, the initial geological parameters include: ground obstacle parameters, which are used to reflect the obstacle conditions on the ground in the area to be enhanced; the first determination module is also used to: obtain the well location design conditions of the ground vertical well, wherein the ground vertical well is used to perform permeability enhancement treatment on the ground fracturing area on the ground; based on the ground obstacle parameters, select the ground fracturing area that matches the well location design conditions from the ground enhanced permeability area.

[0109] Furthermore, the area to be enhanced in permeability contains coal seam resources, and the initial geological parameters also include: coal seam mechanical parameters of the coal seam resources, and coal seam permeability parameters of the coal seam resources, the coal seam mechanical parameters are used to reflect the mechanical properties of the coal seam resources in the area to be enhanced in permeability, and the coal seam permeability parameters are used to reflect the physical properties and rock properties of the coal seam resources in the area to be enhanced in permeability; the first determination module is also used to: determine the expected fracturing pressure of the area to be enhanced in permeability based on the coal seam mechanical parameters; determine the first influencing parameter of the coal seam resources based on the coal seam permeability parameters; determine the expected fracturing water injection volume of the area to be enhanced in permeability according to a preset formula based on the first influencing parameter; and construct ground fracturing parameters based on the expected fracturing pressure and the expected fracturing water injection volume.

[0110] Furthermore, the surface permeability enhancement result includes: the coal seam length of the coal seam resources, and the first actual fracturing area generated when the surface permeability enhancement area is enhanced, and the underground fracturing area includes: multiple segmented fracturing areas; the second determination module is also used to: obtain the first drilling condition of the directional long borehole, wherein the directional long borehole is used to perform permeability enhancement treatment on multiple segmented fracturing areas underground, and the directional long borehole is deployed in a vertical well on the ground; based on the coal seam length and the actual fracturing area, multiple segmented fracturing areas that match the first drilling condition are selected from the underground fracturing area.

[0111] Furthermore, the ground permeability enhancement results also include: the first permeability parameter of the coal seam resources when the ground vertical well is operating, and the underground fracturing parameters include: the first fracturing parameter of the directional long drilling hole; the second determination module is also used to: determine the second influencing parameter of the coal seam resources based on the first permeability parameter; determine the first fracturing water injection volume of the area to be permeable enhanced according to a preset formula based on the second influencing parameter; and construct the first fracturing parameter based on the first fracturing water injection volume and the first preset fracturing parameter.

[0112] Furthermore, the underground fracturing area also includes: multiple pulsating fracturing areas, and the underground fracturing parameters also include: a second fracturing parameter corresponding to the downhole permeable drilling hole, the downhole permeable drilling hole is used to perform permeability enhancement treatment on the multiple pulsating fracturing areas underground, and the downhole permeable drilling hole corresponds to the directional long drilling hole; the second determination module is also used for: in response to the start of the directional long drilling hole, obtaining the second actual fracturing area corresponding to the directional long drilling hole, and the second permeability parameter corresponding to the coal seam resources; obtaining the second drilling condition of the downhole permeable drilling hole; based on the first actual fracturing area and the second actual fracturing area, selecting multiple pulsating fracturing areas matching the second drilling condition from the underground fracturing area; and constructing the second fracturing parameter based on the second permeability parameter.

[0113] Furthermore, the second determination module is also used to: determine the third influencing parameter of the coal seam resources based on the second permeability parameter; determine the second fracturing water injection volume of the area to be permeable according to a preset formula based on the third influencing parameter; and construct the second fracturing parameter based on the second fracturing water injection volume and the second preset parameter.

[0114] An embodiment of the present application further provides an electronic device, comprising: a memory storing an executable program; and a processor for running the program, wherein the program executes the methods in various embodiments of the present invention when running.

[0115] An embodiment of the present application further provides a computer-readable storage medium, which includes a stored executable program, wherein when the executable program is running, the device where the computer-readable storage medium is located is controlled to execute the methods in various embodiments of the present invention.

[0116] An embodiment of the present application further provides a computer program product, including a computer program, which implements the methods in various embodiments of the present invention when executed by a processor.

[0117] An embodiment of the present application further provides a computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium is used to store a computer program, and when the computer program is executed by a processor, the method in each embodiment of the present invention is implemented.

[0118] The embodiments of the present application further provide a computer program, which implements the methods in the above-mentioned embodiments of the present invention when executed by a processor.

[0119] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0120] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0121] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0122] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0123] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0124] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for increasing the permeability of a coal seam, characterized in that: include: Acquire initial geological parameters of the area to be enhanced permeability, wherein the area to be enhanced permeability includes: a surface enhanced permeability area and an underground enhanced permeability area, and the surface enhanced permeability area corresponds to the underground enhanced permeability area; Based on the initial geological parameters, determining a ground fracturing area from the ground permeability enhancement area, and based on the initial geological parameters, determining a ground fracturing parameter corresponding to the ground fracturing area; Based on the surface fracturing parameters, the surface fracturing area is subjected to permeability enhancement to obtain a surface permeability enhancement result; Based on the surface permeability enhancement result, determining the underground fracturing area from the underground permeability enhancement area, and based on the surface permeability enhancement result, determining the underground fracturing parameters corresponding to the underground fracturing area; The underground fracturing zone is enhanced in permeability based on the underground fracturing parameters.

2. The method according to claim 1, characterized in that The initial geological parameters include: ground obstacle parameters, which are used to reflect the obstacle conditions on the ground in the area to be enhanced permeability; based on the initial geological parameters, determining the ground fracturing area from the ground enhanced permeability area includes: Acquiring well location design conditions of a ground vertical well, wherein the ground vertical well is used to perform permeability enhancement treatment on the ground in the ground fracturing area; Based on the ground obstacle parameters, the ground fracturing area matching the well location design conditions is selected from the ground permeability enhancement area.

3. The method according to claim 1, characterized in that The area to be enhanced in permeability includes coal seam resources, and the initial geological parameters further include: coal seam mechanical parameters of the coal seam resources and coal seam permeability parameters of the coal seam resources, the coal seam mechanical parameters are used to reflect the mechanical properties of the coal seam resources in the area to be enhanced in permeability, and the coal seam permeability parameters are used to reflect the physical properties and rock properties of the coal seam resources in the area to be enhanced in permeability; based on the initial geological parameters, determining the ground fracturing parameters corresponding to the ground fracturing area includes: Based on the mechanical parameters of the coal seam, determining the expected fracture initiation pressure of the area to be enhanced in permeability; Based on the coal seam permeability parameter, determining a first influencing parameter of the coal seam resource; Based on the first influencing parameter, determining the expected fracturing water injection volume of the area to be enhanced in accordance with a preset formula; The surface fracturing parameters are constructed based on the expected fracturing initiation pressure and the expected fracturing water injection volume.

4. The method according to claim 3, characterized in that The surface permeability enhancement result includes: the coal seam length of the coal seam resource, and a first actual fracturing area generated when the surface permeability enhancement area is enhanced, and the underground fracturing area includes: a plurality of staged fracturing areas; based on the surface permeability enhancement result, determining the underground fracturing area from the underground permeability enhancement area includes: Acquiring a first drilling condition of a directional long borehole, wherein the directional long borehole is used to perform permeability enhancement treatment on the multiple staged fracturing areas underground, and the directional long borehole is deployed under a vertical well on the ground; Based on the coal seam length and the actual fracturing area, the plurality of staged fracturing areas matching the first drilling condition are selected from the underground fracturing area.

5. The method according to claim 4, characterized in that The surface permeability enhancement result also includes: the first permeability parameter of the coal seam resource when the surface vertical well is running, and the underground fracturing parameter includes: the first fracturing parameter of the directional long drilling hole; based on the surface permeability enhancement result, determining the underground fracturing parameter corresponding to the underground fracturing area includes: Determining a second influencing parameter of the coal seam resource based on the first permeability parameter; Based on the second influencing parameter, determining a first fracturing water injection volume of the area to be permeated according to a preset formula; The first fracturing parameters are constructed based on the first fracturing water injection volume and the first preset fracturing parameters.

6. The method according to claim 1, characterized in that The underground fracturing area further includes: a plurality of pulsating fracturing areas, the underground fracturing parameters further include: a second fracturing parameter corresponding to a downhole perforating borehole, the downhole perforating borehole is used to perform permeability enhancement treatment on the plurality of pulsating fracturing areas underground, and the downhole perforating borehole corresponds to a directional long borehole; based on the surface permeability enhancement result, determining the underground fracturing area from the underground permeability enhancement area includes: In response to the directional long drilling being started, obtaining a second actual fracturing area corresponding to the directional long drilling and a second permeability parameter corresponding to the coal seam resources; Acquire a second drilling condition of the downhole through-layer drilling; Based on the first actual fracturing area and the second actual fracturing area, selecting the plurality of pulsating fracturing areas matching the second drilling condition from the underground fracturing area; The second fracturing parameter is constructed based on the second permeability parameter.

7. The method according to claim 6, characterized in that Constructing the second fracturing parameter based on the second permeability parameter includes: Determining a third influencing parameter of the coal seam resource based on the second permeability parameter; Based on the third influencing parameter, determining the second fracturing water injection volume of the area to be permeable-enhanced according to a preset formula; The second fracturing parameters are constructed based on the second fracturing water injection volume and the second preset parameters.

8. An electronic device, characterized in that: include: A memory storing an executable program; A processor, configured to run the program, wherein the program executes the method according to any one of claims 1 to 7 when running.

9. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored executable program, wherein when the executable program is run, the device where the storage medium is located is controlled to execute the method according to any one of claims 1 to 7.

10. A computer program product, characterized in that The invention comprises a computer program which, when executed by a processor, implements the method according to any one of claims 1 to 7.

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