An intelligent target extraction system for gas in a coal seam

Abstract

The present application belongs to the technical field of mine gas disaster prevention and control, and particularly relates to an intelligent target extraction system for coal seam gas. The system solves the problems of non-intelligent gas extraction, non-rational parameter setting, non-precise extraction, low efficiency and the like in the prior art, and comprises a basic parameter statistical module for presenting the position coordinates of the coal mining face and the gas information as a two-dimensional visual plane model; an extraction target area division module for dividing the two-dimensional visual plane model of the gas parameters of the coal mining face into extraction units; a borehole parameter calculation module for calculating the borehole layout parameters of the three zones of the coal mining face and drawing a borehole layout diagram of the coal mining face; a pipe network data real-time acquisition module for real-time acquisition of the concentration and flow of the gas in each extraction pipe and the collecting pipe; and an extraction negative pressure adjustment module for controlling the negative pressure of the collecting pipe and adjusting the negative pressure of the extraction pipe by adjusting the power of the extraction pump and the opening and closing degree of the electromagnetic control valve.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mine gas disaster prevention and control, and particularly relates to a coal seam gas intelligent targeted extraction system. BACKGROUND

[0002] Coal seam extraction is an important technical method for gas extraction in high-gas and gas outburst mines to reach the standard. At present, coal seam extraction can be divided into pre-extraction and extraction while mining, but no matter which way of coal seam extraction, the mining working face is generally the smallest unit of coal seam extraction design. The extraction parameters in the smallest unit, including drilling layout, drilling parameters, extraction negative pressure, etc., are the same and fixed. However, according to the actual situation of the mining working face, it is known that the gas content and pressure are different in different regions within the working face, especially in the geological structure area, the gas content will change significantly. If the same extraction parameters are used for coal seam extraction, it will inevitably lead to unreasonable distribution of extraction negative pressure and low extraction efficiency. Therefore, it is urgent to research and develop the key theory and technology of realizing precise and efficient extraction of different blocks in the mining working face by reasonably arranging the extraction drillings and distributing the extraction negative pressure. SUMMARY

[0003] In order to solve the problems of non-intelligent gas extraction, unreasonable parameter setting leading to non-precise extraction, low efficiency, and large consumption of manpower, material resources and financial resources in the prior art, the application provides a coal seam gas intelligent targeted extraction system.

[0004] The application adopts the following technical scheme: a coal seam gas intelligent targeted extraction system, comprising a basic parameter statistical module, which is used to present the position coordinates and gas information of the mining working face into a two-dimensional visual plane model; an extraction targeted area division module, which is used to divide the two-dimensional visual plane model of the gas parameters of the mining working face into extraction units; a drilling parameter calculation module, which is used to calculate the drilling parameter of the drilling layout parameter of the three zones of the mining working face, and draw a drilling layout diagram of the mining working face; a pipe network data real-time acquisition module, which is used to acquire the concentration and flow of gas in each extraction pipeline and the collecting pipeline in real time; and an extraction negative pressure deployment module, which realizes the control of the negative pressure of the collecting pipeline and the deployment of the negative pressure of the extraction pipeline by adjusting the power of the extraction pump and the opening and closing degree of the electromagnetic control valve.

[0005] The basic parameter statistical module collects the coal seam gas geological map, the mining engineering plane map and the gas parameters of different measuring points of the mining working face. The gas parameters include gas content, gas pressure, adsorption constant, permeability coefficient, drilling flow decay coefficient, coal void ratio and extraction radius. The position coordinates and gas information of the mining working face are presented into a two-dimensional visual plane model based on the BIM modeling function of the collected content.

[0006] The extraction target area division module divides the extraction units into three categories of sweet spot area, core area and edge area and gives them different colors, forms the gas extraction unit and its partition map of the recovery working face, and determines the edge area as the target extraction area.

[0007] The specific process of the sweet spot area, core area and edge area division is that the weighted gas parameter values are divided into 100 continuous intervals from high to low, and then the extraction unit division is carried out on the two-dimensional visual plane model according to the divided value intervals; subsequently, the extraction units located in the first 20 interval range are defined as the sweet spot area, the extraction units located in the 20-50 interval range are defined as the core area, and the extraction units located in the last 50 interval range are defined as the edge area.

[0008] The calculation process of the weighted gas parameter value is as follows:

[0009]

[0010]

[0011] In the formula: A 1- A n ~ the weighted value of a certain gas parameter at a certain point of the working face; M S ~ the actual value of the gas parameter; M P ~ the average value of the gas parameter of the working face; Q d ~ the weight of the large category to which the gas parameter belongs; Q A ~ the weight of the gas parameter in its large category; A ~ the weighted gas parameter value;

[0012] Among them, the gas content and the gas pressure are the first large category, and the weights of the two are 60% and 40% respectively;

[0013] The permeability coefficient, the adsorption constant and the coal void ratio are the second large category, and the weights of the three are 75%, 20% and 5% respectively;

[0014] The borehole flow decay coefficient and the extraction radius are the third large category, and the weights of the two are 80% and 20% respectively;

[0015] The weights of the first large category, the second large category and the third large category are 50%, 35% and 15% respectively.

[0016] In the borehole parameter calculation module, the borehole parameter calculation includes three parts of borehole spacing, borehole diameter and borehole depth;

[0017] The calculation of the drilling spacing is based on the measured results, the drilling spacing of the sweet spot area is reduced to 0.7 times of the measured results, the drilling spacing of the core area is reduced to 0.9 times of the measured results, and the drilling spacing of the edge area is enlarged to 1.2 times of the measured results;

[0018] The drilling diameter is calculated according to the following formula:

[0019] d= η (Q / V) 1 / 2

[0020] In the formula, d represents the pipeline diameter; η The surplus coefficient is 0.17 for the sweet spot area, 0.16 for the core area, and 0.14 for the edge area; Q represents the mixed gas flow in the pipeline; and V represents the economic flow rate, which is 5-12 m / s;

[0021] The drilling depth is determined according to the outline of the gas extraction zoning map of the mining face, the drilling spacing calculated is used to draw a drilling layout map on the gas extraction zoning map of the mining face, the drilling is vertically arranged on the coal wall of the mining face and sequentially arranged to the outline boundary of the corresponding extraction zone, and the length of the drilling in the drilling layout plan is the depth of each drilling.

[0022] The pipe network data real-time acquisition module acquires the data transmitted by the gas concentration and flow rate monitors installed on the extraction pipelines and the centralized pipelines, and transmits the data to the negative pressure allocation system in real time.

[0023] The method for the negative pressure allocation system to allocate the gas extraction negative pressure is as follows:

[0024] Firstly, the power of the extraction pump is adjusted to 70% of the maximum power, and the continuous extraction is performed for 15 days, during which the gas concentration and flow rate of the extraction pipelines and the centralized pipelines are recorded in real time, and the initial average values are calculated;

[0025] The gas concentration and flow rate of the extraction pipelines and the centralized pipelines are recorded in real time, and the initial average values are calculated;

[0026] In the subsequent extraction process, if the daily gas extraction amount of the centralized pipelines is greater than the initial average value for three consecutive days and the daily extraction amount of the extraction pipelines in the 25% below target extraction area does not decrease, the extraction power of the extraction pump is reduced by 5%, until the above requirements cannot be met; if the daily gas extraction amount of the centralized pipelines is less than the initial average value for three consecutive days and the daily extraction amount of the extraction pipelines in the 25% below target extraction area does not decrease, the extraction power of the extraction pump is increased by 5%, until the above requirements cannot be met or the maximum power of 90% is reached; if the daily extraction amount of the extraction pipelines in the 25% above target extraction area decreases for three consecutive days, the extraction power is kept unchanged, the solenoid valves of about 50% of the pipelines in the non-extraction target area are set to a half-open state, and if the daily extraction amount of the extraction pipelines in the 25% above target extraction area still decreases, the pipelines in the non-extraction target area are set to a closed state.

[0027] Compared with the prior art, the present application has the following beneficial effects:

[0028] The gas parameter value is obtained by weight calculation of the working face gas basic data, and the working face gas extraction sweet spot area is divided according to the gas parameter value, which is more reasonable than the previous way of only using gas content or pressure.

[0029] According to the division results of the working face sweet spot area, the core area and the edge area, the corresponding extraction parameters are designed, which avoids the problem of mismatch between gas area characteristics and extraction parameters in the previous extraction process, such as "big horse pulling small cart" or "small horse pulling big cart", so that the extraction is more targeted.

[0030] Through real-time monitoring of extraction data and adjusting extraction negative pressure by the negative pressure adjusting system, the intelligentization of working face gas extraction is realized, the real-time monitoring and adjustment of parameters make the extraction more precise, greatly improve the efficiency of extraction, and reduce the consumption of manpower, material resources and financial resources. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 The present application is a coal seam gas intelligent targeted extraction system diagram. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0033] The above-mentioned purpose of the present application is achieved by the following technical scheme.

[0034] As shown in Figure 1 A coal seam gas intelligent targeted extraction system, comprising a basic parameter statistical module, an extraction targeting area division module, a drilling parameter calculation module, a pipe network data real-time acquisition module and an extraction negative pressure adjustment module. The extraction method of the coal seam gas intelligent targeted extraction system is as follows:

[0035] First, the coal seam gas geological map, mining engineering plan, and gas basic parameters of different measuring points of the working face, including gas content, gas pressure, adsorption constant, permeability coefficient, drilling flow decay coefficient, coal void ratio and extraction radius, are input into the basic parameter statistical module. The basic parameter statistical module presents the position coordinates and gas information of the working face into a two-dimensional visual plane model based on the BIM modeling function.

[0036] After that, the extraction target area division module divides the two-dimensional visual plane model of the gas parameters of the mining face into extraction units. Then the extraction units are divided into three categories: sweet spot area, core area and edge area, and are respectively assigned with light red, light gray and white colors. The gas extraction unit and its partition map of the mining face are formed, and the non-white area is the default target extraction area.

[0037] Then, the borehole parameter calculation module analyzes and calculates the borehole layout parameters of the three zones of the mining face, including diameter, depth, angle interval, etc., based on the gas extraction unit and its partition map of the mining face, combined with the basic parameter of extraction radius, and draws the borehole layout map of the mining face.

[0038] According to the borehole layout map, drilling is carried out in the mining face, the hole is sealed, the extraction pipeline and the centralized pipeline are installed, the gas concentration and flow monitoring instrument and the electromagnetic control valve are installed on the pipeline, and the real-time data acquisition module of the gas extraction pipeline system and the pipe network of the coal seam in the mining face is formed. The module transmits the concentration and flow of gas in each extraction pipeline and centralized pipeline in real time through the monitoring instrument.

[0039] Finally, the coal seam gas extraction work in the mining face is carried out. According to the information fed back by the pipe network data real-time acquisition module, the negative pressure regulation system controls the centralized pipeline negative pressure and adjusts the extraction pipeline negative pressure by adjusting the power of the extraction pump and the opening and closing degree of the electromagnetic control valve, so as to achieve the purpose of intelligent and efficient extraction of the coal seam gas.

[0040] The further technical solutions are as follows:

[0041] The function of the basic parameter statistical module is to visualize the gas information of the mining face. Based on the two-dimensional mining plane map of the mine, combined with the gas geological map, gas basic parameters, drilling and other dynamic data, the module uses multi-source data collaborative integration technology and BIM algorithm of automatic modeling to build a two-dimensional visual plane model of the mining face, realizing the depth fusion of location information and gas parameters.

[0042] The multi-source data collaborative integration technology first extracts different types of data, then divides the extracted data into location coordinates (x, y) and parameter coordinates (a, b, c…), determines the influence weight of each parameter on the gas parameter, and then visualizes the modeling of the gas parameter through BIM algorithm. In the modeling process, the main considerations are the influence of three categories: gas distribution, extraction difficulty and borehole flow attenuation, and the weights of the three are 50%, 35% and 15% respectively.

[0043] In the first category, the influence of gas content and gas pressure is considered, and the weights of the two are 60% and 40% respectively.

[0044] In the second category, the extraction difficulty degree mainly considers the influence of the permeability coefficient, the adsorption constant and the coal voidage, and the weights of the three are 75%, 20% and 5% respectively.

[0045] In the third category, the borehole flow decay mainly considers the influence of the borehole flow decay coefficient and the extraction radius, and the weights of the two are 80% and 20% respectively.

[0046] The gas parameters include the gas content, the gas pressure, the permeability coefficient, the adsorption constant, the coal voidage, the borehole flow decay coefficient and the extraction radius.

[0047] The calculation process of the gas parameter value is as follows: firstly, the average value of each gas parameter of the working face is determined, and the quotient of each gas parameter and the average value is the value of the participation weight of the parameter. When the weight of each gas parameter is calculated, firstly, the weight of the category to which the parameter belongs is multiplied, and then the weight of the parameter in the category is multiplied to obtain the value of the weighted parameter. Finally, the values of the weighted parameters are added to obtain the value of the gas parameter at the position. The specific process is as follows:

[0048]

[0049]

[0050] In the formula: A 1~the weighted value of a gas parameter at a certain point of the working face; M S ~the actual value of the gas parameter; M P ~the average value of the gas parameter of the working face; Q d ~the weight of the category to which the gas parameter belongs; Q A ~the weight of the gas parameter in the category to which it belongs; A ~the value of the weighted gas parameter.

[0051] The extraction targeting area division module firstly divides the weighted gas parameter values from high to low into 100 continuous intervals, and then divides the extraction units on the two-dimensional visualization plane model according to the divided value intervals; subsequently, the extraction units located in the front 20 interval range are defined as sweet spots and are assigned a light red color, the extraction units located in the 20-50 interval range are defined as core areas and are assigned a light gray color, and the extraction units located in the rear 50 interval range are defined as edge areas and are assigned a white color, to form a gas extraction zoning map of the working face; finally, the non-white area in the gas extraction zoning map is determined as the targeting extraction area.

[0052] The calculation of drilling parameters includes three parts: drilling spacing, drilling diameter and drilling depth. The calculation of drilling spacing is based on the measured results. The drilling spacing in the sweet spot area is reduced to 0.7 times the measured result, the drilling spacing in the core area is reduced to 0.9 times the measured result, and the drilling spacing in the edge area is increased to 1.2 times the measured result. The drilling diameter is calculated according to the following formula:

[0053] d= η (Q / V) 1 / 2

[0054] Where: d ~ pipeline diameter (m); η ~ Redundancy coefficient, the sweet spot area is 0.17, the core area is 0.16, and the edge area is 0.14; Q~ mixed gas flow rate in the pipeline (m 3 / min); V ~ economic flow rate (m / s), which can be 5-12 m / s. The drilling depth is determined based on the outline of the gas extraction zone map of the mining face. Based on the calculated borehole spacing, a drill hole layout diagram is drawn on the gas extraction zone map of the mining face. Drill holes are drilled perpendicular to the coal wall of the mining face to the outline boundary of the corresponding extraction zone. The length of the drill hole in the drill hole layout plan is the depth of each drill hole.

[0055] The gas concentration and flow monitors installed on the extraction pipeline and the centralized pipeline are online fixed methane gas monitors that support single-channel or multi-channel communication and can transmit data wirelessly; the pipeline network data acquisition module can collect gas extraction data from each pipeline in real time and transmit it to the negative pressure distribution system in real time; the solenoid control valve is a normally open pilot diaphragm solenoid valve that can quickly switch between open, half-open and closed.

[0056] The method for adjusting the negative pressure of gas extraction by the negative pressure adjustment system is as follows: first, adjust the power of the extraction pump to 70% of the maximum power, extract continuously for 15 days, record the concentration and flow of gas in each extraction pipeline and centralized pipeline in real time, and calculate the initial average value; in the subsequent extraction process, if the total daily gas extraction of the centralized pipeline is greater than the initial average value for 3 consecutive days and the daily extraction volume of the extraction pipeline below 25% of the targeted extraction area does not decrease, the extraction power of the extraction pump is reduced by 5% until the above requirements cannot be met; if the total daily gas extraction of the centralized pipeline is less than the initial average for 3 consecutive days .... When the initial average value is reached and the daily extraction volume of the extraction pipelines below 25% of the targeted extraction area does not decrease, the extraction power of the extraction pump will be increased by 5% until the above requirements can no longer be met or 90% of the maximum power is reached; if the daily extraction volume of the extraction pipelines above 25% of the targeted extraction area decreases for three consecutive days, the extraction power will be kept unchanged, and the solenoid valves of about 50% of the pipelines in the non-extraction target area will be set to a half-open state; if the daily extraction volume of the extraction pipelines above 25% of the targeted extraction area still decreases, the solenoid valves of about 50% of the pipelines in the non-extraction target area will be set to a closed state.

[0057] The structures, proportions, sizes, etc. shown in the drawings attached to the present specification are merely used to cooperate with the content disclosed in the present specification, to be understood and read by those skilled in the art, and are not used to limit the defined conditions under which the present application can be implemented, and therefore do not have technical significance. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" used in the present specification are merely for the convenience of clear description, and are not used to limit the scope of the present application that can be implemented, and the change or adjustment of the relative relationship, without substantially changing the technical content, is also considered as the scope of the present application that can be implemented.

[0058] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A coal seam gas intelligent targeted extraction system, characterized by: It includes a basic parameter statistics module, which is used to present the location coordinates and gas information of the mining face into a two-dimensional visual plane model; The basic parameter statistics module collects gas parameters from coal seam gas geological maps, mining engineering plan drawings, and different measuring points on the mining face. Gas parameters include gas content, gas pressure, adsorption constant, permeability coefficient, borehole flow attenuation coefficient, coal void ratio, and extraction radius. Based on the collected data and BIM modeling function, the location coordinates of the mining face and gas information are presented as a two-dimensional visual plane model. The sampling target area division module is used to divide the two-dimensional visual plane model into sampling units; The drainage target area division module divides the drainage units into three categories: sweet spot area, core area and edge area, and assigns different colors to each area. This forms a gas drainage unit and its zoning map of the mining face, and identifies the edge area as the targeted drainage area. The specific process of dividing the sweet spot, core area and edge area is to divide the weighted gas parameter values ​​from high to low into 100 continuous intervals, and then divide the extraction units on the two-dimensional visual plane model based on the divided numerical intervals; then, the extraction units in the first 20 intervals are defined as the sweet spot, the extraction units in the 20-50 intervals are defined as the core area, and the extraction units in the last 50 intervals are defined as the edge area; The drilling parameter calculation module is used to calculate the drilling parameters of the three zones of the mining face and draw the drilling layout diagram of the mining face; In the drilling parameter calculation module, the drilling parameter calculation includes three parts: drilling spacing, drilling diameter, and drilling depth. The drilling spacing is calculated based on the measured results. The drilling spacing in the sweet spot area is reduced to 0.7 times the measured result, the drilling spacing in the core area is reduced to 0.9 times the measured result, and the drilling spacing in the edge area is increased to 1.2 times the measured result. The drilling diameter is calculated according to the following formula: d= η (Q / V) 1 / 2 Where: d is the pipe diameter; η is the redundancy factor, which is 0.17 in the sweet spot, 0.16 in the core area, and 0.14 in the edge area; Q is the mixed gas flow rate in the pipe; V is the economic flow rate, which is 5 to 12 m / s. The drilling depth is determined based on the outline of the gas extraction zone map of the mining face. Based on the calculated drilling spacing, a drilling layout diagram is drawn on the gas extraction zone map of the mining face. Drill holes are drilled perpendicular to the coal wall of the mining face to the outline boundary of the corresponding extraction zone. The length of the drill hole in the drilling layout plan is the depth of each drill hole. The pipeline network data real-time acquisition module is used to collect the gas concentration and flow rate in each extraction pipeline and centralized pipeline in real time; The extraction negative pressure adjustment module controls the negative pressure of the centralized pipeline and adjusts the negative pressure of the extraction pipeline by adjusting the power of the extraction pump and the opening and closing degree of the electromagnetic control valve on the pipeline.

2. The intelligent targeted coal seam gas extraction system according to claim 1 is characterized in that: The pipeline network data real-time acquisition module collects data transmitted by gas concentration and flow monitors installed on the extraction pipeline and the centralized pipeline, and transmits the data to the extraction negative pressure allocation module in real time.

3. The intelligent targeted coal seam gas extraction system according to claim 2 is characterized in that: The method for adjusting the gas drainage negative pressure by the drainage negative pressure adjustment module is as follows: First, the extraction pump power was adjusted to 70% of the maximum power, and extraction was continued for 15 days. The gas concentration and flow rate of each extraction pipeline and the centralized pipeline were recorded in real time and the initial average value was calculated. During the subsequent extraction process, if the total daily gas extraction from the centralized pipeline is greater than the initial average value for three consecutive days and the daily extraction volume of the extraction pipelines below 25% of the targeted extraction area does not decrease, the extraction power of the extraction pump will be reduced by 5% until the above requirements cannot be met; if the total daily gas extraction from the centralized pipeline is less than the initial average value for three consecutive days and the daily extraction volume of the extraction pipelines below 25% of the targeted extraction area does not decrease, the extraction power of the extraction pump will be increased by 5% until the above requirements cannot be met or it reaches 90% of the maximum power; if the daily extraction volume of the extraction pipelines in more than 25% of the targeted extraction area decreases for three consecutive days, the extraction power will be kept unchanged, and the electromagnetic control valves of about 50% of the pipelines in the non-extraction target area will be set to a half-open state. If the daily extraction volume of more than 25% of the extraction pipelines in the targeted extraction area still decreases, the pipelines in about 50% of the non-extraction target area will be set to a closed state.

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