CN115575518B - A soil free gas emission flux monitoring system for coal bed methane micro-leakage in goaf areas - Google Patents
A soil free gas emission flux monitoring system for coal bed methane micro-leakage in goaf areas Download PDFInfo
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- CN115575518B CN115575518B CN202211048552.0A CN202211048552A CN115575518B CN 115575518 B CN115575518 B CN 115575518B CN 202211048552 A CN202211048552 A CN 202211048552A CN 115575518 B CN115575518 B CN 115575518B
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Abstract
本发明公开了一种采空区煤层气微渗漏的土壤游离气排放通量监测系统，系统内的采空区上覆地层模拟系统用于采空区上覆地层模拟系统；系统内的采空区煤层气O形气源模拟与控制系统用于模拟采空区游离煤层气以及提供气源并控制气源压力、成分浓度、赋存位置；系统内的土壤层微渗漏气体排放通量测试采样测试装置用于采集微渗漏至表层土壤的气体样品，便于测试土壤游离气成分浓度、排放通量；本系统能够实现在室内模拟地下煤炭采空区煤层气在不同的气体压力、甲烷浓度、赋存空间位置等条件下的微渗漏，并采样测试地表土壤游离气甲烷、二氧化碳浓度及排放通量。
The present invention discloses a soil free gas emission flux monitoring system for coalbed methane micro-leakage in goaf areas, wherein a goaf area overlying stratum simulation system in the system is used for the goaf area overlying stratum simulation system; a goaf area coalbed methane O-shaped gas source simulation and control system in the system is used for simulating goaf area free coalbed methane and providing a gas source and controlling the gas source pressure, component concentration, and storage position; a soil layer micro-leakage gas emission flux test sampling and testing device in the system is used for collecting gas samples of micro-leakage to the surface soil, so as to facilitate testing of soil free gas component concentration and emission flux; the system can simulate the micro-leakage of coalbed methane in underground coal goaf areas under different gas pressures, methane concentrations, storage space positions, etc. indoors, and sample and test the surface soil free gas methane, carbon dioxide concentrations and emission flux.
Description
Technical Field
The invention relates to the field of monitoring of soil free gas discharge flux of goaf coal bed gas micro-leakage, in particular to a system for monitoring the soil free gas discharge flux of goaf coal bed gas micro-leakage.
Background
The surface of the solid earth has methane or light hydrocarbon micro-leakage phenomenon, such as light hydrocarbon micro-leakage existing on the near-surface of most known oil and gas reservoirs at home and abroad, and the oil and gas geochemical exploration is to utilize the light hydrocarbon micro-leakage of the underground oil and gas reservoir to form the near-surface geochemical anomaly, and to define and identify the underground oil and gas reservoir. The phenomenon of micro-leakage of coal bed gas in the goaf of an underground coal mine is found on the ground surface of a plurality of coal mine areas such as Poland, czech and the like, and the phenomenon of micro-leakage of coal bed gas can also form geochemical anomalies on the ground surface soil, including anomalies of concentration and discharge flux of free methane, carbon dioxide and the like of the soil. However, the micro leakage of the coal bed gas in the underground goaf formed by the domestic underground coal mine is not paid importance to the academia and the industry, and the related report of the micro leakage of the coal bed gas in the underground goaf is not disclosed.
After the goaf is formed, a caving zone, a fracture zone and a bending sinking zone are formed on the upper covered stratum vertically, a mining fracture O-shaped ring is formed on the plane, and the mining fracture O-shaped ring is enriched on the mining fracture O-shaped ring on the free coal bed gas plane of mining pressure relief desorption. The partial component molecules of the coal bed gas enriched in the underground mining fracture O-shaped ring relatively quickly migrate to the earth surface through the overburden stratum in the form of micro-bubbles with a colloid size, and the micro-bubbles pass through the overburden stratum and the aquifer of the goaf in a nearly vertical mode, namely micro-seepage, and the micro-seepage gas can form geochemical anomalies such as free gas components, free gas emission flux and the like in the earth surface soil. The geochemical anomaly position and anomaly index in the surface soil are closely related to the occurrence characteristics of the goaf coalbed methane, but no related indoor experimental device exists at present, the occurrence forms (such as gas pressure, methane concentration and occurrence space position) of the goaf coalbed methane can be simulated, and the response relation between the occurrence characteristics of the goaf coalbed methane and geochemical anomalies such as free gas components and displacement flux of the surface soil is analyzed under the condition of micro leakage of the goaf coalbed methane.
Disclosure of Invention
Aiming at the technical defects, the invention aims to provide a system for monitoring the discharge flux of free gas in soil for micro-leakage of coal bed gas in a goaf, which can simulate micro-leakage of coal bed gas in an underground coal goaf under different conditions of gas pressure, methane concentration, occurrence space position and the like indoors and sample and test the concentration and discharge flux of free gas methane and carbon dioxide in earth surface soil.
In order to solve the technical problems, the invention adopts the following technical scheme:
The invention provides a system for monitoring the discharge flux of free soil gas in micro-seepage of coal bed gas in a goaf, which is used for simulating the micro-seepage process of coal bed gas in an underground goaf from an overburden stratum to a near-surface soil layer and sampling and analyzing the micro-seepage gas in the surface soil layer, and comprises a goaf overburden stratum simulation system, a goaf coal bed gas O-shaped gas source simulation and control system and a soil layer micro-seepage gas discharge flux test and sampling device;
The goaf overburden stratum simulation system is used for simulating a goaf overburden stratum and comprises a stratum simulation bin and a simulated stratum, wherein the simulated stratum is filled in the stratum simulation bin;
the goaf coal bed gas O-shaped gas source simulation and control system is used for simulating goaf free coal bed gas, providing gas sources, controlling gas source pressure, component concentration and occurrence positions and comprises an O-shaped simulated fracture ring and a gas source control device, wherein the O-shaped simulated fracture ring is arranged at the bottom of a simulated stratum, and the gas source control device is positioned outside a stratum simulation bin and communicated with the O-shaped simulated fracture ring through a pipeline;
The device for testing and sampling the leakage gas discharge flux of the soil layer is arranged at the top of the simulated stratum and is used for collecting a gas sample which is leaked to the surface soil slightly, so that the concentration and discharge flux of free gas components of the soil can be tested conveniently.
Preferably, the simulated stratum is filled with the stratum column of the overlying stratum of the goaf from bottom to top in sequence, and the simulated stratum, the simulated coal bed and the soil layer are filled with the stratum column of the overlying stratum from bottom to top in sequence.
Preferably, the soil layer micro-leakage gas discharge flux test sampling device comprises a plurality of test cavities, wherein the bottoms of the test cavities are opened and placed into the simulated formation, the tops of the test cavities are provided with air outlet holes and detachable sealing rubber plugs, and the air outlet holes are used for collecting gas by the gas collector.
Preferably, the stratum simulation bin is of a cube structure, the bottom surface, the four side surfaces and the connected side surfaces are all sealed, the top of the stratum simulation bin is open, in order to prevent gas from overflowing from the gap between the simulated stratum and the stratum simulation bin, colloid sealing layers are coated between the periphery of the simulated stratum and the stratum simulation bin, and the soil layer at the top of the simulated stratum is in an open state.
Preferably, the simulated rock stratum and the simulated coal seam in the simulated stratum are based on similar principles, the physical properties of the overburden stratum and the coal seam in the goaf are referred, and similar materials are utilized to manufacture the skeleton in the simulated rock stratum, the manufacturing materials of the skeleton in the simulated rock stratum comprise quartz sand, barite and pumice powder, the cementing agent utilizes water gypsum and sodium silicate, the manufacturing materials of the skeleton in the simulated coal seam comprise coal dust and sand, and the cementing agent adopts gypsum.
Preferably, the air source control device comprises an air cylinder, and an outlet of the air cylinder is sequentially connected with the switch valve, the pressure constant valve, the first pressure gauge, the air storage valve, the air storage bin, the air sample collection controller, the second pressure gauge, the air inlet valve and the O-shaped simulated fracture ring through pipelines.
Preferably, the O-shaped simulated fracture ring comprises a cross rod and a hollow annular pipeline, four ends of the cross rod are respectively fixed with four sides of the annular pipeline to form a Chinese character 'tian', a plurality of air outlet sieve holes communicated with the inner cavity of the annular pipeline are formed in the annular pipeline, and the inner cavity of the annular pipeline is communicated with a gas cylinder in the gas source control device through a pipeline.
The invention also provides a monitoring method of the monitoring system for the free soil gas discharge flux of the goaf coalbed methane micro-leakage, which comprises the following steps:
s1, preparing a goaf coalbed methane gas source by referring to the composition and concentration of coalbed methane gas in a coal mine goaf, and filling the gas source into a gas cylinder;
s2, gas filling of a gas storage bin is completed by using a gas cylinder, and the injection pressure is the gas pressure of the coal bed gas in the actual goaf of the coal mine;
s3, after the gas storage bin is filled with the gas, closing a gas storage valve, opening a gas inlet valve, and enabling the gas to flow into the O-shaped simulated slit ring;
S4, after the pressure of the second pressure gauge is reduced by 0.1MPa, arranging a plurality of test cavities on the soil layer, and covering the soil layer by sampling points;
S5, placing the test cavity from which the sealing rubber plug is removed into the soil layer for 10-30mm below the surface of the soil layer, and supplying air into the test cavity;
S6, after 3-5min, sealing the test cavity by using a sealing rubber plug, and collecting gas samples by using a gas collector to penetrate through the sealing rubber plug and extend into the test cavity;
And S7, extracting a gas sample from the test cavity to the gas sample bottle by using the gas collector at preset time intervals, measuring the gas components and the concentration in the sample by using the gas chromatograph, obtaining a change curve of the gas concentration along with the sampling time, and calculating the gas components and the discharge flux.
Preferably, the method comprises the steps of, step S7 sets the time interval as 0min,2min,4min,8min,10min and so on.
The invention has the beneficial effects that:
(1) According to the goaf overburden stratum simulation system, simulated stratum is arranged in the stratum simulation bin, so that geological conditions of micro leakage of coal bed gas in the goaf are provided, and the goaf overburden geological model is built;
(2) The goaf coalbed methane O-shaped gas source simulation and control system simulates the key goaf coalbed methane occurrence states such as gas pressure, component concentration, occurrence position and the like, and provides controllable and monitored experimental conditions;
(3) The device for testing and sampling the discharge flux of the micro-seepage gas of the soil layer can obtain the samples of the micro-seepage gas of the coal bed gas of the goaf to the soil layer on the ground surface at different plane positions and at different times, so as to test and analyze the discharge flux and the concentration of free gas components.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a system for monitoring the free gas discharge flux of soil for micro-leakage of coal bed gas in a goaf according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an O-shaped simulated slit ring according to an embodiment of the present invention;
fig. 3 is an installation schematic diagram of a test cavity according to an embodiment of the present invention.
Reference numerals illustrate:
1. A gas cylinder; 2, a switching valve, 3, a pressure constant valve, 4, a first pressure gauge, 5, a pipeline, 6, a gas storage valve, 7, a gas storage bin, 8, a gas sample collection controller, 9, a second pressure gauge, 10, an air inlet valve, 11, an O-shaped simulated fracture ring, 12, a stratum simulated bin, 13, a simulated stratum, 14, a simulated coal bed, 15, a soil layer, 16, a test cavity, 17, a sealing rubber plug, 18, a gas collector, 19, a gas outlet sieve pore, 20 and a cross rod.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As shown in fig. 1 to 3, a system for monitoring the discharge flux of free gas in the soil of micro-leakage of coal bed gas in a goaf is used for the simulation of the micro-leakage process of coal bed gas in an underground goaf from an overlying stratum to a near-surface soil layer and the sampling analysis of micro-leakage gas in the surface soil layer,
Firstly, experimental background information such as the columnar shape of an overburden stratum of a goaf of a certain coal mine, physical properties (such as lithology, rock mechanical properties, pore parameters and the like) of a main rock stratum, the gas pressure of coal bed gas of the goaf of the coal mine, the concentration of gas components and the like is obtained, and a soil sample close to the surface of the overburden stratum of the goaf of the coal mine is collected;
The system comprises a goaf overburden stratum simulation system, a goaf coalbed methane O-shaped gas source simulation and control system and a soil layer micro-leakage gas discharge flux test sampling device;
The goaf overburden stratum simulation system is used for simulating goaf overburden stratum and comprises a stratum simulation bin 12 and a simulated stratum, wherein the simulated stratum is filled in the stratum simulation bin;
The simulated stratum is filled with stratum columns covered by the goaf from bottom to top in sequence, and the simulated stratum 13, the simulated coal bed 14 and the soil layer 15 are filled with the stratum columns from bottom to top in sequence.
The total thickness of the simulated stratum is 1.4m, the thickness of the soil layer 15 is 0.4m, and the soil layer 15 in the simulated stratum is filled by covering the soil near the surface of the goaf of the coal mine.
The simulated rock stratum 13 and the simulated coal seam 14 in the simulated stratum are manufactured by referring to the physical properties of the overburden stratum and the coal seam of the goaf based on the similar principle, the manufacturing materials of the framework in the simulated rock stratum 13 comprise quartz sand, barite and pumice powder, the cementing agent comprises water gypsum and sodium silicate, the manufacturing materials of the framework in the simulated coal seam 14 comprise coal dust and sand, and the cementing agent comprises gypsum.
The stratum simulation bin is of a cube structure, the bottom surface, the four side surfaces and the connected side surfaces are all sealed, the top of the stratum simulation bin 12 is open, in order to prevent gas from overflowing from a gap between the simulated stratum and the stratum simulation bin 12, colloid sealing layers are coated between the periphery of the simulated stratum and the stratum simulation bin 12, and a soil layer 15 at the top of the simulated stratum is in an open state.
The goaf coal bed gas O-shaped gas source simulation and control system is used for simulating goaf free coal bed gas, providing gas sources, controlling gas source pressure, component concentration and occurrence positions and comprises an O-shaped simulated fracture ring 11 and a gas source control device, wherein the O-shaped simulated fracture ring 11 is arranged at the bottom of a simulated stratum, and the gas source control device is positioned outside a stratum simulated bin 12 and is communicated with the O-shaped simulated fracture ring 11 through a pipeline;
The device for testing and sampling the leakage gas discharge flux of the soil layer is arranged at the top of the simulated stratum and is used for collecting a gas sample which is leaked to the surface soil slightly, so that the concentration and discharge flux of free gas components of the soil can be tested conveniently.
The device for testing and sampling the micro-leakage gas emission flux of the soil layer comprises a plurality of testing cavities 16, the diameter of each testing cavity 16 is 50mm, the bottom of each testing cavity 16 is opened and placed into a simulated stratum, the top of each testing cavity 16 is provided with a gas outlet hole and a detachable sealing rubber plug 17, and the gas outlet holes are used for collecting gas by a gas collector 18.
The air source control device comprises an air bottle 1, and an outlet of the air bottle 1 is sequentially connected with a switch valve 2, a pressure constant valve 3, a first pressure gauge 4, an air storage valve 6, an air storage bin 7, an air sample collection controller 8, a second pressure gauge 9, an air inlet valve 10 and an O-shaped simulated slit ring 11 through a pipeline 5.
The gas storage bin 7 is a high-pressure-resistant sealed gas bin and is used for providing stable gas sources with fixed volumes under different pressures, and is combined with the second pressure gauge 9 to monitor the pressure change of gas formed by the dissipation of the coalbed methane in the goaf;
The O-shaped simulated fracture ring 11 comprises a cross rod 20 and a hollow annular pipeline, four ends of the cross rod 20 are respectively fixed with four sides of the annular pipeline to form a Chinese character 'tian', a plurality of air outlet sieve holes 19 communicated with the inner cavity of the annular pipeline are formed in the annular pipeline, and the inner cavity of the annular pipeline is communicated with the air bottle 1 in the air source control device through a pipeline 5.
In this embodiment, the size of the O-shaped simulated fracture ring 11 is 50×50cm, 12 air outlet sieve holes are arranged on an annular pipeline of the O-shaped simulated fracture ring 11, the diameter of each air outlet sieve hole is 2.0cm, the O-shaped simulated fracture ring 11 is arranged at the lower part of the simulated stratum and 10cm from the bottom surface of the stratum simulated bin 12, the O-shaped simulated fracture ring 11 is used for simulating a mining fracture O-shaped ring, and a simulated goaf free coalbed methane enrichment zone is formed after ventilation.
The invention also provides a monitoring method of the monitoring system for the free soil gas discharge flux of the goaf coalbed methane micro-leakage, which comprises the following steps:
s1, preparing a goaf coalbed methane gas source by referring to the composition and concentration of coalbed methane gas in a coal mine goaf, and pouring the gas source into a gas cylinder 1;
S2, gas filling of the gas storage bin 7 is completed by using the gas cylinder 1, and the injection pressure is the gas pressure of the coal bed gas in the actual coal mine goaf;
S3, after the gas storage bin 7 is filled with gas, closing the gas storage valve 6, opening the gas inlet valve 10, and enabling the gas to flow into the O-shaped simulated slit ring 11;
s4, after the pressure of the second pressure gauge 9 is reduced by 0.1MPa, arranging a plurality of test cavities 16 on the soil layer 15, and covering the soil layer 15 by sampling points;
s5, placing the test cavity 16 from which the sealing rubber plug 17 is removed into the soil layer 15 for 10-30mm below the surface, and supplying air into the test cavity 16;
s6, after 3-5min, sealing the test cavity 16 by using the sealing rubber plug 17, and collecting gas samples by using the gas collector 18 to penetrate through the sealing rubber plug 17 and extend into the test cavity 16;
s7, extracting a gas sample from the test cavity 16 to a gas sample bottle by using the gas collector 18 at preset time intervals, measuring the gas components and the concentration, such as CH4 and CO2, in the sample by using a gas chromatograph, acquiring a change curve of the gas concentration along with the sampling time, and calculating the gas components, such as CH4 and CO2 emission flux.
Step S7 sets the time interval as 0min,2min,4min,8min,10min and so on.
The invention realizes the real simulation of the overlying geologic body of the goaf of the coal mine. The goaf coalbed methane O-shaped gas source simulation and control system simulates key goaf coalbed methane occurrence states such as gas pressure, component concentration, occurrence position and the like, provides controllable and monitored experimental conditions, and can collect the coalbed methane micro-seepage of the goaf to the soil layer gas with different plane positions and different times on the ground surface by the soil layer micro-seepage gas discharge flux test sampling device so as to test and analyze gas discharge flux and free gas component concentration. The invention can analyze the response relation between the occurrence characteristics (such as gas pressure, methane concentration and occurrence space position) of the goaf coalbed methane and the geochemical anomalies of the earth surface soil under the condition of micro leakage of the goaf coalbed methane.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
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| CN109187925A (en) * | 2018-09-18 | 2019-01-11 | 太原理工大学 | A kind of abandoned mine goaf gas-liquid counter current three-dimensional analog simulation pilot system |
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| DE4120354A1 (en) * | 1991-06-20 | 1992-01-16 | Karl Dr Heidrich | Soil gas sampling and on-site analysis - using combined probe and drill tubing with internal packer system |
| WO2004027677A1 (en) * | 2002-09-23 | 2004-04-01 | Columbia Technologies, Llc | System, method and computer program product for subsurface contamination detection and analysis |
| CN104897872B (en) * | 2015-05-16 | 2017-03-08 | 中国矿业大学 | Gas three-dimensional seepage simulation device and simulation method in closed goaf |
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| CN109187925A (en) * | 2018-09-18 | 2019-01-11 | 太原理工大学 | A kind of abandoned mine goaf gas-liquid counter current three-dimensional analog simulation pilot system |
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| 断层对烃类微渗漏主控作用及异常分布影响的实验模拟研究;王国建等;物探与化探;20180228;第42卷(第1期);21-27 * |
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