Coal mine goaf extraction drill hole layout method

Abstract

The invention discloses a coal mine goaf extraction drill hole layout method, and relates to the technical field of extraction drill hole layout. According to the coal mine goaf extraction drill hole laying method, physical property data of a plurality of to-be-laid areas of a coal mine goaf are obtained, gas extraction priority indexes of all the to-be-laid areas of the coal mine goaf are analyzed and arranged in a descending order, and the optimal gas extraction priority index is obtained; according to the method, the physical property data of all the areas of the coal mine goaf are comprehensively analyzed, the gas release comprehensive index and the gas emission efficiency index of each area are obtained, and therefore the gas release potential and the emission capacity of each area can be accurately determined; the area with high gas release efficiency is preferentially selected when the drill holes are arranged, so that the gas resources in the coal mine can be utilized to the greatest extent by the drill holes, and the resource waste caused by unreasonable drill hole arrangement is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of extraction drilling layout, and in particular to a method for arranging extraction drilling holes in a coal mine goaf area. Background Art

[0002] The layout of extraction drilling holes in coal mine goafs is a basic task in coal mine safety management. With the deep mining of coal mines and the continuous expansion of goaf areas, the danger of harmful gases such as methane accumulated in goafs is gradually increasing. Traditional extraction methods can no longer meet the safety production needs of modern coal mines. Goafs are hollow areas after mine mining. Due to the different geological characteristics of coal seams, there is a large amount of gas release. If these gases are not extracted in time, they are very likely to cause major safety accidents such as gas explosions. Therefore, how to scientifically and reasonably arrange extraction drilling holes has become the research focus of coal mine safety technology.

[0003] The gas release in the goaf is mainly affected by factors such as geological conditions, coal seam characteristics, and mine mining depth. During the mining process, as the goaf gradually expands, the structure of the coal seam changes, forming different gas release areas. The gas release amount and release rate in these areas are different. Therefore, it is necessary to accurately divide the goaf according to the specific geological conditions in order to formulate a reasonable drilling layout plan. Traditional drilling layout methods rely more on experience or simple theoretical models, and often cannot accurately reflect the gas distribution characteristics of each area in the goaf, resulting in low drilling layout efficiency and even blind layout.

[0004] The limitations of the existing technology include at least the following problems. First, in the process of laying out drilling holes in coal mine goafs, the existing methods are often limited to laying out holes through simple area divisions, and fail to fully utilize the specific physical characteristics of different areas in the goaf for in-depth analysis, which can easily lead to the gas release potential and emission efficiency of certain areas not being fully considered, resulting in unsatisfactory gas extraction effects. In addition, the existing methods usually ignore the complex geological conditions and gas flow laws in the goaf, resulting in the difficulty in accurately matching the drilling layout scheme with the actual needs of each area, thereby increasing the cost and risk of drilling layout. Secondly, in the existing technology, there is usually a lack of systematic comprehensive evaluation of gas release capacity and emission efficiency before drilling layout, and the gas extraction priority of each area cannot be scientifically analyzed, which can easily lead to unreasonable drilling layout locations, thereby affecting the efficiency and safety of gas extraction in the goaf. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a method for laying out gas extraction drilling holes in coal mine goaf areas, which solves the problems of inaccurate drilling layout, low gas extraction efficiency and waste of resources existing in the prior art.

[0006] To achieve the above purpose, the present invention is implemented by the following technical scheme: a method for laying out extraction drilling holes in coal mine goaf, comprising the following steps: obtaining physical property data of several areas to be laid out in the coal mine goaf, and conducting comprehensive analysis to obtain a comprehensive gas release index and a gas emission efficiency index for each area to be laid out in the coal mine goaf; conducting a comprehensive analysis on the comprehensive gas release index and the gas emission efficiency index of each area to be laid out in the coal mine goaf to obtain a gas extraction priority index for each area to be laid out in the coal mine goaf, and arranging them in descending order to obtain an optimal gas extraction priority index, and using the corresponding area to be laid out as a drilling hole layout position in the coal mine goaf; and after determining the drilling hole layout position in the coal mine goaf, analyzing the drilling hole density value and the drilling hole depth value; wherein, the specific formula for calculating the gas extraction priority index of each area to be laid out in the coal mine goaf is as follows: QcC i =QsF i QF i Among them, QcC i is the gas extraction priority index of the i-th area to be deployed in the coal mine goaf, QsF i QpF is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas emission efficiency index of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0007] Furthermore, the physical property data include permeability value, porosity value, geological stress value, specific surface value, seepage velocity value, regional temperature value, gas concentration value, and goaf thickness value.

[0008] Furthermore, the specific steps for obtaining the comprehensive gas release index of each area to be arranged in the coal mine goaf are as follows: read the permeability value, porosity value, and geological stress value of each area to be arranged in the coal mine goaf, and conduct a comprehensive analysis to obtain the permeability correction index of each area to be arranged in the coal mine goaf; conduct a comprehensive analysis on the permeability correction index of each area to be arranged in the coal mine goaf, respectively in combination with the specific surface value, seepage velocity value, porosity value, and regional temperature value of each area to be arranged in the coal mine goaf, to obtain the gas release rate index of each area to be arranged in the coal mine goaf; analyze the gas concentration correction index of each area to be arranged in the coal mine goaf based on the gas concentration value of each area to be arranged in the coal mine goaf; conduct a comprehensive analysis on the gas release rate index and the gas concentration correction index of each area to be arranged in the coal mine goaf, to obtain the comprehensive gas release index of each area to be arranged in the coal mine goaf; wherein, the specific formula for calculating the comprehensive gas release index of each area to be arranged in the coal mine goaf is as follows: QsF i =QfS i *Q iAmong them, QsF i QfS is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas release rate index of the i-th area to be deployed in the coal mine goaf, QnX i is the gas concentration correction index of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0009] Furthermore, the specific formula for calculating the permeability correction index and gas release rate index of each area to be deployed in the coal mine goaf is as follows: Among them, StX i is the permeability correction index of the i-th area to be deployed in the coal mine goaf, StL i is the permeability value of the i-th area to be laid out in the coal mine goaf, e is a natural constant, KxL i is the porosity value of the i-th area to be laid out in the coal mine goaf, β is the pore permeability influence coefficient stored in the database, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, λ is the stress permeability influence coefficient stored in the database, QfS i BmZ is the gas release rate index of the i-th area to be deployed in the coal mine goaf, i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD i is the seepage velocity value of the i-th area to be laid out in the coal mine goaf, θ is the pore gas release influence coefficient stored in the database, WdZ i is the regional temperature value of the i-th area to be laid out in the coal mine goaf, ε is the temperature influence coefficient stored in the database, ω is the temperature adjustment factor stored in the database, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0010] Furthermore, the specific steps of analyzing the gas concentration correction index of each area to be laid out in the coal mine goaf are as follows: obtaining the goaf thickness value of each area to be laid out in the coal mine goaf and the goaf thickness parameter value of the coal mine goaf, and combining the gas concentration value, regional temperature value and geological stress value of each area to be laid out in the coal mine goaf for comprehensive analysis to obtain the gas concentration correction index of each area to be laid out in the coal mine goaf; wherein, the specific formula for calculating the gas concentration correction index of each area to be laid out in the coal mine goaf is as follows: Among them, QnX i is the gas concentration correction index of the i-th area to be deployed in the coal mine goaf, HqN i is the gas concentration value of the i-th area to be laid out in the coal mine goaf, WdZ iis the regional temperature value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, η is the influence coefficient of temperature and gas concentration stored in the database, CkH i is the goaf thickness value of the i-th area to be laid out in the coal mine goaf, CkC is the goaf thickness parameter value of the coal mine goaf, ξ is the thickness influence coefficient stored in the database, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0011] Furthermore, the specific steps for obtaining the gas emission efficiency index of each area to be laid out in the coal mine goaf are as follows: obtaining the geological stress parameter value of each area to be laid out in the coal mine goaf; reading the comprehensive gas release index, specific surface value, seepage velocity value, and geological stress value of each area to be laid out in the coal mine goaf, and performing a comprehensive analysis in combination with the geological stress parameter value of each area to be laid out in the coal mine goaf to obtain the gas emission efficiency index of each area to be laid out in the coal mine goaf.

[0012] Furthermore, the specific formula for calculating the gas emission efficiency index of each area to be deployed in the coal mine goaf is as follows: Among them, QpF i is the gas emission efficiency index of the i-th area to be deployed in the coal mine goaf, QsF i is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, BmZ i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD i is the seepage velocity value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, DzC i is the geological stress parameter value of the i-th area to be laid out in the coal mine goaf, ρ is the stress emission influence coefficient stored in the database, i=1, 2, 3, …, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0013] Furthermore, the specific steps for analyzing the drilling density value and the drilling depth value are as follows: obtain the area value of the area to be laid out corresponding to the drilling layout position in the coal mine goaf, and conduct a comprehensive analysis based on the comprehensive index of gas release of each area to be laid out in the coal mine goaf to obtain the drilling density value; conduct a comprehensive analysis of the porosity value, specific surface area value, and comprehensive index of gas release of each area to be laid out in the coal mine goaf to obtain the drilling depth value.

[0014] Furthermore, the specific formula for calculating the drilling density value is as follows: Among them, ZkM is the drilling density value, QsF iis the comprehensive gas release index of the i-th area to be laid out in the coal mine goaf, QyM is the area value of the area to be laid out corresponding to the drilling layout position in the coal mine goaf, i = 1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0015] Furthermore, the specific formula for calculating the drilling depth value is as follows: Among them, ZkS is the drilling depth value, QsF i KxL is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the porosity value of the i-th area to be laid out in the coal mine goaf, BmZ i is the specific area value of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0016] The present invention has the following beneficial effects:

[0017] (1) The method for arranging gas drilling holes for coal mine goaf areas is to conduct a comprehensive analysis of the physical property data of each area in the coal mine goaf area to obtain the comprehensive gas release index and gas emission efficiency index of each area. Through this analysis, the gas release potential and emission capacity of each area can be accurately determined, so that areas with high gas release efficiency are given priority when arranging drilling holes. This precise arrangement ensures that the drilling holes can maximize the use of gas resources in the coal mine, avoids the waste of resources caused by unreasonable drilling hole arrangement, improves the overall efficiency of gas extraction in the coal mine goaf area, and also reduces the construction cost and unnecessary environmental impact caused by redundant drilling holes.

[0018] (2) The method for laying out gas extraction drilling holes in the goaf of the coal mine calculates the gas extraction priority index and adopts a comprehensive index analysis method to determine the drilling hole layout position, thereby ensuring the reasonable distribution of drilling density and depth. By calculating the gas release comprehensive index and gas emission efficiency index of each area to be laid out, and then selecting the best drilling hole layout area by arranging them in descending order, it can effectively reduce the situation of over-drilling or missing key areas. This method not only reduces the number of unnecessary drilling holes and construction costs, but also reduces the risks in the drilling hole layout process, thereby improving the economic benefits and controllability of the construction.

[0019] (3) The method for laying out gas extraction drilling holes in the goaf of the coal mine determines the location of the drilling holes and then calculates the drilling density and depth based on the comprehensive gas release index, porosity, specific surface area and other parameters of each area, making the extraction design more refined. Through reasonable drilling layout and precise gas extraction scheme, the safety hazards caused by excessive gas concentration can be effectively avoided. In addition, the optimization of gas emission efficiency and extraction priority helps to improve the long-term sustainability of gas management and reduce environmental pollution and coal mine accident risks while ensuring the safety of coal mine operations.

[0020] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 The present invention is a flow chart of a method for laying out extraction drilling holes in a coal mine goaf.

[0022] Figure 2 The present invention is a flowchart of the specific steps of obtaining the comprehensive gas release index of each area to be laid out in the coal mine goaf in a method for laying out extraction drilling holes in the coal mine goaf of the present invention. DETAILED DESCRIPTION

[0023] The overall idea of ​​the problem in the embodiment of this application is as follows:

[0024] Firstly, the physical property data of multiple areas to be laid out in the goaf of the coal mine are obtained, including permeability, porosity, geological stress, specific surface, seepage velocity, regional temperature, gas concentration and goaf thickness, etc. By comprehensively analyzing these data, the comprehensive gas release index and gas emission efficiency index of each area are calculated. Secondly, based on the calculated comprehensive gas release index and gas emission efficiency index, a comprehensive analysis is carried out to obtain the gas extraction priority index of each area. These priority indices are arranged in descending order, and the area with the highest priority index is selected as the drilling layout location. Finally, after determining the drilling layout location, the drilling density and drilling depth are analyzed. By comprehensively analyzing the regional area, comprehensive gas release index, porosity, specific surface and other data, the drilling density value and drilling depth value are calculated, thereby providing a basis for drilling layout.

[0025] See also Figure 1The embodiment of the present invention provides a technical solution: a method for laying out extraction drilling holes in a coal mine goaf, comprising the following steps: obtaining physical property data of several areas to be laid out in the coal mine goaf, and conducting a comprehensive analysis to obtain a comprehensive gas release index and a gas emission efficiency index for each area to be laid out in the coal mine goaf; conducting a comprehensive analysis on the comprehensive gas release index and the gas emission efficiency index of each area to be laid out in the coal mine goaf to obtain a gas extraction priority index for each area to be laid out in the coal mine goaf, and arranging them in descending order to obtain an optimal gas extraction priority index (i.e., selecting the largest gas extraction priority index), and using the corresponding area to be laid out as the drilling hole layout position of the coal mine goaf; and after determining the drilling hole layout position of the coal mine goaf, analyzing the drilling density value and the drilling depth value.

[0026] The specific formula for calculating the gas extraction priority index of each area to be deployed in the coal mine goaf is as follows: QcC i =QsF i QF i Among them, QcC i is the gas extraction priority index of the i-th area to be deployed in the coal mine goaf, QsF i QpF is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas emission efficiency index of the i-th area to be arranged in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be arranged in the coal mine goaf.

[0027] Physical property data include permeability value, porosity value, geological stress value, specific surface area value, seepage velocity value, regional temperature value, gas concentration value, and goaf thickness value.

[0028] Among them, the permeability value can be obtained through laboratory measurement or field testing. Common experimental methods include gas or liquid permeability tests (such as common gas permeability tests or hydraulic tests). These experiments are conducted on core samples or inferred through geological exploration and drilling samples. It reflects the permeability of rock or coal seams to gas flow. The higher the permeability, the easier the gas flow. It is a key parameter for determining gas extraction efficiency and gas release rate.

[0029] The porosity value can be obtained by analyzing rock samples in the laboratory. Common methods include gas replacement method, vacuum method or water substitution method. The estimated value of porosity can also be obtained through geological exploration, seismic reflection data or field measurement. It indicates the proportion of voids in the rock or coal seam, which affects the storage and seepage capacity of gas. The higher the porosity, the more gas the coal seam can store and the greater the potential for gas release.

[0030] The geological stress value can be obtained through on-site geological exploration, measured in a borehole using stress measuring equipment (such as a stress gauge), or estimated through rock mechanics experiments and numerical simulations. It affects the stability of the coal seam and the release of gas. Higher geological stress may compress the pores in the coal seam, reducing the fluidity and release efficiency of the gas. It also affects the development of cracks in the coal seam, thereby affecting the difficulty of gas extraction.

[0031] The specific area value can be obtained by measuring the ratio of the surface area to the volume of the coal seam. It is usually calculated through surface analysis techniques (such as scanning electron microscopy, gas adsorption method), or by numerical modeling or inference based on the particle size of the coal seam. It reflects the surface area of ​​the coal seam and affects the contact and release rate of the gas. The larger the specific area, the larger the surface space for gas release and the higher the gas release potential.

[0032] The seepage velocity value can be obtained through laboratory measurement or field testing. For example, the flow velocity of gas or liquid in the coal seam is measured through hydraulic experiments or gas seepage experiments. It reflects the flow velocity of gas in the coal seam and directly affects the gas emission and extraction efficiency. The higher the seepage velocity, the better the gas fluidity and the higher the extraction efficiency.

[0033] The regional temperature value can be monitored in real time in the goaf by temperature sensors. Commonly used measuring equipment include geothermometers, sensors or infrared imaging technology. Sensors can be set in boreholes or exploration wells for continuous monitoring, which affects the diffusion and permeability of gas. Higher temperatures can accelerate the flow of gas, making it easier to release gas and increase the permeability of gas. In addition, temperature will also affect the physical properties of coal seams, such as porosity and permeability.

[0034] The gas concentration value can be measured by gas detection instruments. Common methods include using methane sensors or other gas analyzers to conduct on-site sampling in mines or goafs. It reflects the enrichment of gas in coal seams and is a key indicator for evaluating gas release potential and extraction efficiency. A higher gas concentration means that more gas is stored in the coal seam, which can easily lead to an increased risk of gas emissions, but it also means a higher gas extraction potential.

[0035] Specifically, Figure 2As shown, the specific steps for obtaining the comprehensive gas release index of each area to be arranged in the coal mine goaf are as follows: read the permeability value, porosity value, and geological stress value of each area to be arranged in the coal mine goaf, and conduct a comprehensive analysis to obtain the permeability correction index of each area to be arranged in the coal mine goaf; conduct a comprehensive analysis on the permeability correction index of each area to be arranged in the coal mine goaf, respectively, in combination with the specific surface value, seepage velocity value, porosity value, and regional temperature value of each area to be arranged in the coal mine goaf, to obtain the gas release rate index of each area to be arranged in the coal mine goaf; analyze the gas concentration correction index of each area to be arranged in the coal mine goaf based on the gas concentration value of each area to be arranged in the coal mine goaf; conduct a comprehensive analysis on the gas release rate index and the gas concentration correction index of each area to be arranged in the coal mine goaf, to obtain the comprehensive gas release index of each area to be arranged in the coal mine goaf.

[0036] Among them, the specific formula for calculating the comprehensive gas release index of each area to be laid out in the coal mine goaf is as follows: QsF i =QfS i *Q i Among them, QsF i QfS is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas release rate index of the i-th area to be deployed in the coal mine goaf, QnX i is the gas concentration correction index of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0037] The specific formula for calculating the permeability correction index and gas release rate index of each area to be laid out in the coal mine goaf is as follows: Among them, StX i is the permeability correction index of the i-th area to be deployed in the coal mine goaf, StL i is the permeability value of the i-th area to be deployed in the coal mine goaf, e is a natural constant, which is 2.718 in this embodiment, KxL i is the porosity value of the i-th area to be laid out in the coal mine goaf, β is the porosity permeability influence coefficient stored in the database (i.e., the influence coefficient of porosity on permeability), DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, λ is the stress permeability influence coefficient stored in the database (i.e., the influence coefficient of geological stress on permeability), QfS i BmZ is the gas release rate index of the i-th area to be deployed in the coal mine goaf, i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD iis the seepage velocity value of the i-th area to be laid out in the coal mine goaf, θ is the pore gas release influence coefficient stored in the database (i.e., the influence coefficient of porosity on gas release rate), WdZ i is the regional temperature value of the i-th area to be laid out in the coal mine goaf, ε is the temperature influence coefficient stored in the database, ω is the temperature adjustment factor stored in the database, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0038] It needs to be explained that the specific steps for obtaining β are as follows: it is obtained through experimental research and numerical models. Usually, the laboratory will determine the permeability under different porosity conditions through gas or liquid permeability tests on rock samples, and obtain this coefficient by regression analysis of the relationship between different porosities and permeabilities or through numerical simulation calculations. This coefficient is usually stored in the database as a standard parameter of the influence of porosity on permeability.

[0039] The specific steps for obtaining λ are as follows: it is obtained through rock mechanics tests, usually measured on the relationship between stress and permeability. The influence of geological stress on coal seam permeability can be obtained through permeability experiments of core samples, especially gas or liquid permeability experiments under high stress environments. By applying different levels of stress and measuring the change in permeability, the influence coefficient of stress on permeability is calculated.

[0040] The specific steps for obtaining θ are as follows: it is obtained through laboratory gas release experiments, usually by measuring the gas release rate of coal seams under different porosity conditions. During the experiment, the porosity of the coal seam is changed, the gas release rate is measured, and the influence coefficient of porosity on the gas release rate is obtained through regression analysis. This coefficient can be obtained by combining permeability and porosity.

[0041] The specific steps for obtaining ε are as follows: it is obtained through experimental data, especially through experimental measurements of changes in coal seam gas release or permeability at different temperatures. In the laboratory, by controlling the temperature, the changes in physical properties such as gas release rate and permeability are observed, and the influence coefficient of temperature on these physical properties is obtained based on the experimental results. The fluidity and release rate changes of gas under different temperature conditions are experimentally measured, and finally the temperature influence coefficient is calculated.

[0042] The specific steps for obtaining ω are as follows: it is obtained through modeling and regression analysis of the relationship between temperature and permeability, gas release rate and other parameters. In the goaf of a coal mine, the temperature data of the goaf is obtained through a temperature monitoring instrument, and then the changes in gas release and permeability of the coal seam at different temperatures are measured through multiple experiments, and finally a temperature adjustment factor is derived.

[0043] The specific steps for analyzing the gas concentration correction index of each area to be laid out in the coal mine goaf are as follows: obtain the goaf thickness value of each area to be laid out in the coal mine goaf, as well as the goaf thickness parameter value of the coal mine goaf, and conduct a comprehensive analysis based on the gas concentration value, regional temperature value, and geological stress value of each area to be laid out in the coal mine goaf to obtain the gas concentration correction index of each area to be laid out in the coal mine goaf.

[0044] Among them, the thickness value of the goaf can be measured through geological exploration, drilling sampling or remote sensing technology. The vertical thickness of each coal seam can be obtained by drilling, or the depth can be measured using seismic reflection waves to infer the thickness of the goaf, which affects the gas storage space and extraction efficiency. The thicker the goaf, the more gas is stored and the greater the potential for gas release. The depth and thickness of the goaf are also crucial to determining the depth and layout of the borehole.

[0045] The specific formula for calculating the gas concentration correction index of each area to be laid out in the coal mine goaf is as follows: Among them, QnX i is the gas concentration correction index of the i-th area to be deployed in the coal mine goaf, HqN i is the gas concentration value of the i-th area to be laid out in the coal mine goaf, WdZ i is the regional temperature value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, η is the temperature gas concentration influence coefficient stored in the database (i.e., the influence coefficient of temperature on gas concentration), CkH i is the goaf thickness value of the i-th area to be laid out in the coal mine goaf, CkC is the goaf thickness parameter value of the coal mine goaf, ξ is the thickness influence coefficient stored in the database, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0046] It needs to be explained that the specific steps for obtaining η are as follows: it is obtained through a large number of experiments and field data accumulation. In the coal mine goaf, the changing relationship of gas concentration under different temperature conditions is obtained through experimental measurement. Specifically, temperature changes will affect the diffusion rate and gas concentration of the gas. Therefore, it is necessary to measure the changes in gas concentration of coal seams at different temperatures through experiments or field monitoring. Through these experimental data, the relationship between temperature and gas concentration can be derived, and a temperature gas concentration influence coefficient can be obtained through regression analysis. This coefficient is usually saved in the coal mine database for subsequent calculations and adjustments.

[0047] The specific steps for obtaining ξ are as follows: it is obtained through experimental research or numerical simulation of the changes in gas concentration in goafs of different thicknesses. In the goaf, the thickness of the goaf has an important influence on the storage and release of gas. The thickness of the coal seam determines the space for storing gas in the coal seam. When the thickness is large, the gas may be more difficult to release. Therefore, it is necessary to study the influence of different thicknesses on gas concentration and release rate through field exploration, experimental measurement or simulation calculation. Based on these data, the thickness influence coefficient obtained by regression analysis will be stored in the database for subsequent calculations.

[0048] In this implementation plan, firstly, by comprehensively analyzing the key physical parameters such as the permeability, porosity, and geological stress of the coal mine goaf, an accurate permeability correction index and gas release rate index can be provided for each area to be laid out. The calculation of these indices can help determine which areas have higher gas release potential, thereby optimizing the selection of drilling locations, improving the efficiency of gas recovery, and reducing the waste of resources caused by blind extraction. Secondly, the gas release rate is closely related to factors such as the specific surface area and seepage velocity of the coal mine area. The comprehensive analysis of these factors allows the entire system to consider not only the amount of gas released, but also the speed and fluidity of gas release, thereby improving the accuracy of the extraction operation. By quantifying these complex influencing factors into indices, more scientific regional divisions and drilling layout decisions can be achieved, avoiding the uncertainty brought about by traditional empirical judgments. In addition, The introduction of the gas concentration correction index further optimizes the gas concentration analysis of the mining area. Combined with the influence of factors such as temperature and stress, it can more accurately evaluate the gas content in different areas, which is particularly important for improving the safety of coal mine goafs. It can effectively avoid safety hazards caused by excessive gas concentration and ensure that the working environment meets safety requirements. Through these comprehensive analyses and corrections, the resources of coal mines can be maximized, the efficiency of gas recovery can be improved, and unnecessary extraction operations can be reduced. Moreover, based on data-driven, this method has greatly improved its scientificity and accuracy through experimental research, numerical simulation and other means. In general, this method not only provides strong data support for the sustainable development of coal mines, but also improves the safety and economy of coal mine production processes, and provides practical solutions for the rational utilization of mineral resources and the effective control of gas emissions.

[0049] Specifically, the specific steps for obtaining the gas emission efficiency index of each area to be laid out in the coal mine goaf are as follows: obtain the geological stress parameter value of each area to be laid out in the coal mine goaf; read the comprehensive gas release index, specific surface value, seepage velocity value, and geological stress value of each area to be laid out in the coal mine goaf, and conduct a comprehensive analysis based on the geological stress parameter value of each area to be laid out in the coal mine goaf to obtain the gas emission efficiency index of each area to be laid out in the coal mine goaf.

[0050] The specific formula for calculating the gas emission efficiency index of each area to be laid out in the coal mine goaf is as follows: Among them, QpF i is the gas emission efficiency index of the i-th area to be deployed in the coal mine goaf, QsF i is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, BmZ i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD i is the seepage velocity value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, DzC i is the geological stress parameter value of the i-th area to be laid out in the coal mine goaf, ρ is the stress emission influence coefficient stored in the database (that is, the influence coefficient of geological stress on gas emission efficiency), i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0051] It needs to be explained that the specific steps for obtaining ρ are as follows: it is obtained through rock mechanics experiments and field tests. Usually, this coefficient reflects the influence of geological stress on gas emission efficiency. In order to obtain the stress emission influence coefficient, it is usually necessary to conduct experimental measurements on the gas release of coal seams under different stress conditions. During the experiment, by applying different geological stresses, the changes in gas release rate or gas fluidity are observed, and the changes in gas emissions under different stress values ​​are recorded. Through the experimental data, regression analysis can be performed to obtain the influence coefficient of geological stress on gas emission efficiency. This coefficient will be saved in the coal mine database for subsequent calculations and analysis.

[0052] In this implementation plan, firstly, the calculation of the gas emission efficiency index comprehensively analyzes multiple factors such as geological stress, comprehensive gas release index, specific surface area, seepage velocity, etc. This analysis method can accurately measure the gas emission potential of each area to be deployed, and dynamically adjust it according to the specific environmental conditions in the area. By incorporating the influence of geological stress into the calculation, it ensures the accurate evaluation of the gas release efficiency of different areas in the goaf, thereby avoiding the errors caused by ignoring the influence of geological stress on gas fluidity and emission. Secondly, the effect of geological stress usually has a significant impact on the gas emission of coal seams, especially in high stress environments, the gas permeability and release rate of coal seams may be significantly reduced. By introducing the stress emission influence coefficient, the specific impact of geological stress on gas emission efficiency can be quantified, thereby helping mine managers to accurately judge which areas have higher gas release efficiency and which areas may need to adjust the gas production strategy due to the influence of geological stress. This can effectively avoid blind extraction in areas with greater geological stress, thereby improving The overall efficiency and safety of high gas extraction can be improved. In addition, combined with factors such as specific surface value and seepage velocity, the gas release characteristics of coal seams can be analyzed more comprehensively to ensure that the gas emission efficiency of each area to be laid out is reasonably evaluated. For example, changes in specific surface value and seepage velocity often directly affect the fluidity and emission rate of gas. These factors, together with geological stress, determine the diffusion capacity and emission of gas in the area. Therefore, this comprehensive analysis method can provide more detailed and comprehensive gas emission data for the mining area, which is helpful to formulate a more reasonable drilling layout plan. In addition, the calculation of the gas emission efficiency index can provide data support for coal mine production, helping managers to adjust the extraction strategy in real time during the actual production process to ensure efficient utilization and safe emission of resources. In actual operation, this method combines experimental data with numerical analysis to provide a scientific and forward-looking decision-making basis, reduce the uncertainty of human decision-making, and avoid low extraction efficiency or safety hazards that may be caused by low regional gas emission efficiency.

[0053] Specifically, the specific steps for analyzing the drilling density value and the drilling depth value are as follows: obtain the area value of the area to be laid out corresponding to the drilling layout position of the coal mine goaf, and conduct a comprehensive analysis based on the comprehensive index of gas release of each area to be laid out in the coal mine goaf to obtain the drilling density value; conduct a comprehensive analysis of the porosity value, specific surface area value, and comprehensive index of gas release of each area to be laid out in the coal mine goaf to obtain the drilling depth value.

[0054] The specific formula for calculating the drilling density value is as follows: Among them, ZkM is the drilling density value, QsF iis the comprehensive gas release index of the i-th area to be laid out in the coal mine goaf, QyM is the area value of the area to be laid out corresponding to the drilling layout position in the coal mine goaf, i = 1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0055] The specific formula for calculating the drilling depth value is as follows: Among them, ZkS is the drilling depth value, QsF i KxL is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the porosity value of the i-th area to be laid out in the coal mine goaf, BmZ i is the specific area value of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

[0056] In this implementation scheme, firstly, the calculation of the drilling density value comprehensively considers the regional area and the comprehensive index of gas release of each area to be laid out, and can accurately evaluate the number of boreholes required for each area. In areas with higher gas release, increasing the number of boreholes helps to improve the efficiency of gas extraction; in areas with lower gas release, the drilling layout can be appropriately reduced to avoid waste of resources. By combining the specific conditions of regional area and gas release, the optimization of drilling density can ensure the efficient utilization of coal mine resources, avoid unnecessary drilling work, reduce drilling construction costs, and improve gas recovery rate. Secondly, the calculation of drilling depth value can accurately determine the appropriate depth of drilling in each area by analyzing porosity, specific surface area and comprehensive index of gas release. Porosity and specific surface area are key factors affecting gas release rate and permeability. By comprehensively analyzing these factors, the appropriate drilling depth can be selected according to the actual situation of each area. For example, in areas with higher porosity, the drilling depth can be appropriately deepened to ensure gas energy. In areas with lower porosity, the drilling depth can be appropriately reduced to avoid over-drilling. Such a design can ensure gas recovery efficiency while avoiding waste of resources caused by over-exploitation. In addition, the reasonable setting of drilling density and drilling depth can not only improve the gas recovery efficiency of coal mines, but also effectively reduce safety risks. Reasonable layout of drilling holes can ensure more uniform gas emission and avoid excessive local gas accumulation, which leads to excessive gas concentration in mines and increases the risk of safety hazards such as explosions. At the same time, scientific selection of drilling depth can avoid unnecessary underground resource exploitation caused by excessively deep drilling and reduce the danger of mine operations. Finally, this comprehensive analysis method based on multiple parameters such as gas release comprehensive index, regional area, porosity and specific surface value not only improves the scientificity and accuracy of drilling layout, but also provides strong data support for coal mine production. Through this data-driven decision-making method, coal mine managers can make more scientific decisions based on real-time monitoring data and historical analysis results.

[0057] In summary, this application has at least the following effects:

[0058] By comprehensively analyzing the physical property data of each area in the coal mine goaf, the comprehensive gas release index and gas emission efficiency index of each area are obtained. Through this analysis, the gas release potential and emission capacity of each area can be accurately determined, so that areas with high gas release efficiency can be given priority when arranging drilling holes. This precise layout ensures that the drilling holes can maximize the use of gas resources in the coal mine, avoids the waste of resources caused by unreasonable drilling layout, improves the overall efficiency of gas extraction in the coal mine goaf, and at the same time reduces the construction costs and unnecessary environmental impacts caused by redundant drilling.

[0059] By calculating the gas extraction priority index and using a comprehensive index analysis method to determine the location of the borehole layout, ensuring the reasonable distribution of the borehole density and depth, and by calculating the comprehensive gas release index and gas emission efficiency index of each area to be laid out, and then selecting the best borehole layout area by arranging them in descending order, it can effectively reduce the situation of over-drilling or missing key areas. This method not only reduces the number of unnecessary drilling holes and construction costs, but also reduces the risks in the drilling layout process, thereby improving the economic benefits and controllability of the construction.

[0060] After determining the location of the borehole layout, the borehole density and depth are calculated based on the comprehensive gas release index, porosity, specific surface area and other parameters in each area, so that the extraction design can be more refined. Through reasonable drilling layout and precise gas extraction plan, the safety hazards caused by excessive gas concentration can be effectively avoided. In addition, the optimization of gas emission efficiency and extraction priority will help to improve the long-term sustainability of gas management and reduce environmental pollution and coal mine accident risks while ensuring the safety of coal mine operations.

[0061] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0062] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A method for laying out extraction drilling holes in a coal mine goaf, characterized in that: The following steps are involved: Obtaining physical property data of several areas to be laid out in the coal mine goaf, and conducting comprehensive analysis to obtain a comprehensive gas release index and a gas emission efficiency index for each area to be laid out in the coal mine goaf; Comprehensively analyze the gas release comprehensive index and gas emission efficiency index of each area to be deployed in the coal mine goaf, obtain the gas extraction priority index of each area to be deployed in the coal mine goaf, and arrange them in descending order to obtain the optimal gas extraction priority index, and use the corresponding area to be deployed as the drilling layout position of the coal mine goaf; After determining the drilling hole layout location in the coal mine goaf, analyze the drilling hole density value and drilling hole depth value; The specific formula for calculating the gas extraction priority index of each area to be deployed in the coal mine goaf is as follows: QcC i =QsF i *QpF i ; Among them, QcC i is the gas extraction priority index of the i-th area to be deployed in the coal mine goaf, QsF i QpF is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas emission efficiency index of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

2. The method for laying out extraction drilling holes in coal mine goaf according to claim 1, characterized in that: The physical property data include permeability value, porosity value, geological stress value, specific surface value, seepage velocity value, regional temperature value, gas concentration value, and goaf thickness value.

3. The method for laying out extraction drilling holes in coal mine goaf according to claim 2, characterized in that: The specific steps for obtaining the comprehensive gas release index of each area to be deployed in the coal mine goaf are as follows: Read the permeability value, porosity value, and geological stress value of each area to be laid out in the coal mine goaf, and conduct a comprehensive analysis to obtain the permeability correction index of each area to be laid out in the coal mine goaf; The permeability correction index of each area to be laid out in the coal mine goaf is comprehensively analyzed in combination with the specific surface value, seepage velocity value, porosity value, and regional temperature value of each area to be laid out in the coal mine goaf to obtain the gas release rate index of each area to be laid out in the coal mine goaf; Based on the gas concentration value of each area to be laid out in the coal mine goaf, analyzing the gas concentration correction index of each area to be laid out in the coal mine goaf; Comprehensively analyze the gas release rate index and gas concentration correction index of each area to be deployed in the coal mine goaf to obtain the comprehensive gas release index of each area to be deployed in the coal mine goaf; The specific formula for calculating the comprehensive gas release index of each area to be deployed in the coal mine goaf is as follows: QsF i =QfS i *(QnX i ; Among them, QsF i QfS is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the gas release rate index of the i-th area to be deployed in the coal mine goaf, QnX i is the gas concentration correction index of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

4. The method for laying out extraction drilling holes in coal mine goaf according to claim 3, characterized in that: The specific formula for calculating the permeability correction index and gas release rate index of each area to be laid out in the coal mine goaf is as follows: Among them, StX i is the permeability correction index of the i-th area to be deployed in the coal mine goaf, StL i is the permeability value of the i-th area to be laid out in the coal mine goaf, e is a natural constant, KxL i is the porosity value of the i-th area to be laid out in the coal mine goaf, β is the pore permeability influence coefficient stored in the database, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, λ is the stress permeability influence coefficient stored in the database, QfS i BmZ is the gas release rate index of the i-th area to be deployed in the coal mine goaf, i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD i is the seepage velocity value of the i-th area to be laid out in the coal mine goaf, θ is the pore gas release influence coefficient stored in the database, WdZ i is the regional temperature value of the i-th area to be laid out in the coal mine goaf, ε is the temperature influence coefficient stored in the database, ω is the temperature adjustment factor stored in the database, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

5. The method for laying out extraction drilling holes in coal mine goaf according to claim 3, characterized in that: The specific steps for analyzing the gas concentration correction index of each area to be laid out in the coal mine goaf are as follows: Obtain the goaf thickness value of each area to be laid out in the goaf of the coal mine, as well as the goaf thickness parameter value of the goaf of the coal mine, and conduct a comprehensive analysis based on the gas concentration value, regional temperature value, and geological stress value of each area to be laid out in the goaf of the coal mine, to obtain the gas concentration correction index of each area to be laid out in the goaf of the coal mine; The specific formula for calculating the gas concentration correction index of each area to be laid out in the coal mine goaf is as follows: Among them, QnX i is the gas concentration correction index of the i-th area to be deployed in the coal mine goaf, HqN i is the gas concentration value of the i-th area to be laid out in the coal mine goaf, WdZ i is the regional temperature value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, η is the influence coefficient of temperature and gas concentration stored in the database, CkH i is the goaf thickness value of the i-th area to be laid out in the coal mine goaf, CkC is the goaf thickness parameter value of the coal mine goaf, ξ is the thickness influence coefficient stored in the database, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

6. The method for laying out extraction drilling holes in coal mine goaf according to claim 2, characterized in that: The specific steps for obtaining the gas emission efficiency index of each area to be laid out in the coal mine goaf are as follows: Obtain the geological stress parameter value of each area to be laid out in the coal mine goaf; The comprehensive gas release index, specific surface area, seepage velocity value and geological stress value of each area to be laid out in the coal mine goaf are read, and a comprehensive analysis is performed in combination with the geological stress parameter values ​​of each area to be laid out in the coal mine goaf to obtain the gas emission efficiency index of each area to be laid out in the coal mine goaf.

7. The method for laying out extraction drilling holes in coal mine goaf according to claim 6, characterized in that: The specific formula for calculating the gas emission efficiency index of each area to be laid out in the coal mine goaf is as follows: Among them, QpF i is the gas emission efficiency index of the i-th area to be deployed in the coal mine goaf, QsF i is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, BmZ i is the specific surface value of the i-th area to be laid out in the coal mine goaf, SsD i is the seepage velocity value of the i-th area to be laid out in the coal mine goaf, DzY i is the geological stress value of the i-th area to be laid out in the coal mine goaf, DzC i is the geological stress parameter value of the i-th area to be laid out in the coal mine goaf, ρ is the stress emission influence coefficient stored in the database, i=1, 2, 3, …, i0, i0 is the number of areas to be laid out in the coal mine goaf.

8. The method for laying out extraction drilling holes in coal mine goaf according to claim 2, characterized in that: The specific steps for analyzing the drilling density value and drilling depth value are as follows: Obtain the area value of the area to be laid out corresponding to the drilling hole layout position in the coal mine goaf, and conduct a comprehensive analysis based on the comprehensive gas release index of each area to be laid out in the coal mine goaf to obtain the drilling hole density value; The porosity value, specific surface value and comprehensive gas release index of each area to be laid out in the coal mine goaf are comprehensively analyzed to obtain the drilling depth value.

9. The method for laying out extraction drilling holes in coal mine goaf according to claim 8, characterized in that: The specific formula for calculating the drilling density value is as follows: Among them, ZkM is the drilling density value, QsF i is the comprehensive gas release index of the i-th area to be laid out in the coal mine goaf, QyM is the area value of the area to be laid out corresponding to the drilling layout position in the coal mine goaf, i=1, 2, 3, ..., i0, i0 is the number of areas to be laid out in the coal mine goaf.

10. The method for laying out extraction drilling holes in coal mine goaf according to claim 8, characterized in that: The specific formula for calculating the drilling depth value is as follows: Among them, ZkS is the drilling depth value, QsF i KxL is the comprehensive index of gas release in the i-th area to be deployed in the coal mine goaf, i is the porosity value of the i-th area to be laid out in the coal mine goaf, BmZ i is the specific area value of the i-th area to be laid out in the coal mine goaf, i=1, 2, 3,…, i0, i0 is the number of areas to be laid out in the coal mine goaf.

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