CN110017164B - Experimental device and method for integrally preventing and controlling coal mine composite power disaster - Google Patents
Experimental device and method for integrally preventing and controlling coal mine composite power disaster Download PDFInfo
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- CN110017164B CN110017164B CN201910298753.8A CN201910298753A CN110017164B CN 110017164 B CN110017164 B CN 110017164B CN 201910298753 A CN201910298753 A CN 201910298753A CN 110017164 B CN110017164 B CN 110017164B
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F7/00—Methods or devices for drawing- off gases with or without subsequent use of the gas for any purpose
Abstract
The experimental device and the method for integrally preventing and controlling the composite dynamic disaster of the coal mine utilize the same drill hole to perform water injection and gas extraction in a subsection mode, reduce impact tendency of a coal body and displace gas through water injection, simultaneously increase water injection effect of a coal seam when the gas pressure in the coal body is reduced in the gas extraction, and solve the problem that the coal seam with high gas pressure and low permeability is difficult to inject water in deep mining. The device has the advantages that water injection and extraction can be carried out simultaneously, can be carried out discontinuously, can be carried out repeatedly and can be carried out simultaneously, greatly improves the water injection effect of the deep high-stress low-permeability coal seam, and reduces the gas outburst composite power disaster risk of rock burst.
Description
Technical Field
The invention relates to an experimental device and a method for preventing and treating coal mine composite power disasters by integrating coal seam water injection and gas extraction, in particular to a device and a method for preventing and treating coal mine rock burst gas outburst composite power disasters by simultaneously performing water injection and gas extraction on a deep high-stress low-permeability coal seam.
Background
Along with the deep development of coal mine excavation activities, stope conditions of a coal mine deep mining area are further deteriorated, a coal bed after deep mining has the characteristics of high stress and high gas, and a rock burst gas outburst composite power disaster frequently occurs. The urgent requirement for realizing safe production is to deeply develop the research for preventing and controlling the coal mine composite power disaster.
The coal seam water injection is to inject water into the coal seam through drilling water injection holes in the coal seam, and then inject water into the coal body, so that the water can be uniformly distributed in a large number of fine cracks and pores in the coal seam, and the water enters the pores and then is adsorbed in gas and CO in the pores2When gas and water generate competitive adsorption effect, gas is desorbed and then gushes out, and simultaneously water can moisten coal body, reduce impact tendency and elastic energy of coal, and the like, thereby playing a common control measure for controlling gas outburst composite power disasters caused by rock burst and the like. However, along with the increase of the mining depth, the coal seam is judged as an injectable coal seam according to the identification method for coal seam water injection availability of MT/T1023-2006, but in the process of carrying out field water injection under the original water injection parameters, the coal seam water injection is found to be in the initial stageAnd part of water can be injected, but the daily water injection amount of the water injection hole is low, the daily water injection amount of the water injection hole is gradually reduced along with the lapse of water injection time, and after 5-7 days of water injection, the water is basically not injected into the drill hole. Therefore, in order to improve the water injection effect, the designer of the invention provides a device and a method capable of obviously improving the water injection effect by thinking, experience summary and combining with actual conditions on site.
Disclosure of Invention
The invention aims to solve the problem of poor water injection effect caused by high ground stress and large gas pressure of a deep mining coal bed, and provides a method for performing water injection and gas extraction by adopting the same drilling hole in a segmented manner.
In order to achieve the purpose, the invention adopts the technical scheme that: an integrated experimental method for preventing and controlling coal mine composite power disasters comprises the following steps:
1) forming a coal sample model and an experimental environment:
1.1) making a coal sample model: taking a coal sample, grinding coal into powder, mixing the powder with water according to the mass ratio of 1:2, and pressing to form a coal sample model; coating a concrete outer layer on the outer layer of the prepared coal sample model;
1.2) simulation environment: perforating and injecting gas and CO into coal sample model2Allowing gas and CO to flow2Adsorbing in pores of briquette for 1-2 days, and sealing the pores with coal and cement slurry; arranging a pressure mechanism outside the model, and applying pressure to the coal sample model to simulate the underground conditions of the coal mine;
2) preparation of the experiment:
2.1) sequentially drilling a plurality of injection and production holes on the coal sample model from top to bottom, wherein the interval of each water injection hole is 2 m;
2.2) inserting a sleeve with holes of a sleeve pipe which is externally distributed with a pipe sealer, a flow sensor and a gas sensor and internally provided with a gas extraction pipe and a water injection pipe into the injection and production hole; connecting a gas extraction pipe to a gas extraction pump, wherein the gas extraction pump is connected to a gas collection bottle; the water injection pipe is connected to the water pump, and the other end of the water pump is connected and inserted into the reservoir; the electric wires of the flow sensor and the gas sensor are connected to the console;
3) experiment:
3.1) starting the gas extraction pump to completely extract gas, and stopping the gas extraction pump when the reading of the gas sensor is changed from the low-concentration indicator lamp to the medium-high concentration; then, the water pump is opened, and according to the reading of the flow sensor, a valve at the water outlet of the water injection pipe is controlled by the console to perform sectional water injection;
3.2) during water injection, observing the reading of the flow sensor, when the flow sensor is increased or not decreased, indicating that a certain crack hole exists in the coal seam, closing a valve at the water outlet of the section, and stopping the water injection of the section; then the next section of water injection pipe is replaced for water injection; when the gas sensor rises to the high-concentration indicating lamp, stopping water injection, starting a gas extraction pump, closing the gas extraction pump when the reading of the gas sensor falls back to the low-concentration indicating lamp after extraction for a period of time, and continuing water injection;
3.3) the injection and extraction sequences of adjacent injection and extraction holes are different, and water injection of one injection and extraction hole starts first and extraction of the next injection and extraction hole starts first, so that internal circulation is formed;
4) and (4) conclusion: and after the experiment is finished, the reading of the gas collecting bottle is observed, the gas emission quantity is determined, the gas emission quantity after water injection is 0.53 times more than that of the common water injection mode, and the time spent by the gas emission quantity after water injection is shortened by 1.1 times compared with that of the common water injection mode. The water injection mode has obvious water injection effect.
The pressing mechanism is hydraulic oil cylinders arranged at the top and two sides of the coal sample model, the hydraulic oil cylinders at the top apply 25MPa pressure to the coal sample model, and the hydraulic oil cylinders at the two sides apply 15MPa pressure to the coal sample model.
The volume of the coal sample model is 150m3And the thickness of the concrete outer layer is 30 cm.
The integrated experimental device for preventing and controlling the composite dynamic disaster of the coal mine comprises a coal sample model which is externally wrapped with a concrete outer layer; the injection and production hole penetrates into the coal sample model from the side surface, a sleeve pipe provided with a hole packer outside extends into the injection and production hole, and water outlet holes are uniformly distributed on the sleeve pipe; a water injection pipe and a gas collecting pipe are arranged inside the sleeve with the hole; the position of a nozzle on the water injection pipe corresponds to the position of a water outlet hole of the sleeve; a flow sensor is arranged at the position of the water outlet hole; the gas collecting pipe is provided with a gas collecting inlet communicated with the coal sample model, and a gas sensor is arranged at the gas collecting inlet.
The water injection inlet of the water injection pipe is sequentially connected with an external water pump and an external reservoir.
And the gas outlet of the gas collecting pipe is sequentially connected with an external gas extraction pump and a gas collecting bottle.
The beneficial effects created by the invention are as follows: the invention provides an experimental device and method for integrally preventing and controlling composite dynamic disasters of a coal mine. The method can be applied to a high-gas coal seam mined in a deep part, can simultaneously perform water injection and gas extraction, greatly enhances the water injection effect, reduces the impact tendency of a coal body, reduces the gas content in the coal body, and improves the water injection and extraction effects because the gas extraction and the water injection can be performed simultaneously in a water injection hole in a segmented mode. In the experimental process, the water injection effect of the coal is higher than that of common water injection by more than 5 times, the disaster prevention effect is higher than that of common water injection by 1.3 times, and if the device is applied to the actual water injection process, a good water injection effect is obtained. .
Drawings
FIG. 1 is a schematic structural diagram of an experimental apparatus for the present invention.
Fig. 2 is a schematic diagram of the structure in the injection-production hole.
Fig. 3 is a schematic structural diagram of a gas collecting bottle.
Detailed Description
An integrated experimental method for preventing and controlling coal mine composite power disasters comprises the following steps:
1, forming a coal sample model and an experimental environment:
1.1, making a coal sample model: taking a coal sample, grinding the coal into powder, mixing the powder with water according to the mass ratio of 1:2, and pressing to form a coal sample model 10; coating the outer layer of the prepared coal sample model 10 with a concrete outer layer 7;
1.2 simulation environment: punching a hole in the coal sample model 10, injecting gas and CO2 to enable the gas and CO2 to be absorbed in the pores of the molded coal, wherein the absorption time is 1-2 days, and sealing the hole by using coal and cement slurry after the absorption is finished; and a pressurizing mechanism is arranged outside the model to pressurize the coal sample model 10 and simulate the underground condition of the coal mine.
2 preparation of the experiment:
2.1, sequentially punching N injection and production holes 8 at intervals of 2m from top to bottom on the coal sample model;
2.2 inserting a sleeve pipe 9 with holes, which is provided with a pipe sealer 18, a flow sensor 13 and a gas sensor 14 at the outer part and a gas extraction pipe 15 and a water injection pipe 16 at the inner part, into the injection and production hole; connecting a gas extraction pipe 15 to a gas extraction pump 2, and connecting the gas extraction pump 2 to a gas collection bottle 1; the water injection pipe is connected to the water pump 4, and the other end of the water pump 4 is connected and inserted into the water storage tank 3; the flow sensor 13 and the gas sensor 14 are connected to the console 12 through wires.
3, experiment:
3.1, starting the gas extraction pump 2 to completely extract gas, and when the reading of the gas sensor 14 is at a low-concentration indicating lamp, finishing extraction and closing the gas extraction pump 2; then, the water pump 4 is opened, and according to the reading of the flow sensor 13, a valve at the water outlet of the water injection pipe 16 is controlled by the console to perform sectional water injection;
3.2, when water is injected, the reading of the flow sensor 13 is observed, when the flow sensor 13 is increased or not decreased, the fact that a certain crack hole exists in the coal seam is indicated, a valve at the water outlet of the section is closed, and water injection of the section is stopped; then the next section of water injection pipe is replaced for water injection; when the gas sensor 14 rises to the high-concentration indicator light, stopping water injection, starting the gas extraction pump 2, closing the gas extraction pump when the reading of the gas sensor 14 falls below a threshold value after extraction for a period of time, and continuing water injection;
3.3 the injection and extraction sequences of adjacent injection and extraction holes are different, and water injection of one injection and extraction hole starts first and extraction of the next injection and extraction hole starts first, so that internal circulation is formed.
And 4, conclusion: and after the experiment is finished, the reading of the gas collecting bottle is observed, the gas emission quantity is determined, the gas emission quantity after water injection is 0.53 times more than that of the common water injection mode, and the time spent by the gas emission quantity after water injection is shortened by 1.1 times compared with that of the common water injection mode. The water injection effect is very obvious.
The pressing mechanism is hydraulic oil cylinders 6 arranged at the top and two sides of the coal sample model 10, and the hydraulic oil cylinders 6 at the top apply pressure to the coal sample model 10The pressure of 25MPa is applied, and the hydraulic oil cylinders 6 on the two sides apply the pressure of 15MPa to the coal sample model 10. The volume of the coal sample model 10 is 150m3And the thickness of the concrete outer layer 7 is 30 cm.
The integrated experimental device for preventing and treating the coal mine composite dynamic disaster comprises a coal sample model 10 coated with a concrete outer layer 7; the injection and production hole 8 penetrates into the coal sample model 10 from the side surface, a sleeve 9 provided with a hole packer 18 outside extends into the injection and production hole 8, and water outlet holes are uniformly distributed on the sleeve 9; a water injection pipe 16 and a gas collecting pipe 15 are arranged inside the sleeve 9 with the hole; the nozzle position on the water injection pipe 16 corresponds to the water outlet position of the sleeve 9; a flow sensor 13 is arranged at the position of the water outlet hole; the gas collecting pipe 15 is provided with a gas collecting inlet leading to the coal sample model 10, and a gas sensor 14 is arranged at the gas collecting inlet.
The water injection inlet of the water injection pipe 16 is connected with the external water pump 2 and the external reservoir 3 in sequence.
And a gas outlet of the gas collecting pipe 15 is sequentially connected with an external gas extraction pump 2 and a gas collecting bottle 1.
And a steel frame 5 is arranged at the periphery of the briquette and used for fixing a hydraulic oil cylinder. The gas collecting bottle 1 is provided with scale marks 17 which are buckled upside down in water, and the pumped gas is sucked into the gas collecting bottle 1 through the gas inlet pipe 11.
Example 1:
the perforated casing 9 with the hole packer 18 refers to a continuous plurality of hole packers with good sealing performance outside the casing, and the hole packer is made of expansion materials. The water injection pipe 16 and the gas collection pipe 15 in the casing pipe 9 with the hole are composed of two hard plastic pipes which are sleeved together without mutual interference, the gas collection pipe 15 is an inner pipe, the water injection pipe 16 is an outer pipe, each 5m nozzle and each hole packer are arranged, a valve controlled by an operation control table is arranged on each nozzle, each nozzle is a water outlet, a flow sensor is arranged nearby, and the data transmitted by the flow sensor 13 is used for controlling the water injection amount of each section by the operation control table. The outside is respectively connected with the gas extraction pump 2 and the water pump 4. After the drilling by the drilling machine, the sleeve with the hole packer 18 is inserted into the water injection hole, and then the hole packer is operated.
The water pump 4 is used to convey water from the reservoir 3 to the holes made in the coal pattern. The gas extraction pump 2 extracts gas from the coal body and presses the gas into the gas collection bottle 1.
The water storage tank 3 is made of a stainless steel plate and concrete, the right end of the water storage tank is connected with the water pump 4, and the water storage tank 3 is mainly used for storing water; the flow sensor 13 is used for controlling a valve, a water injection valve is controlled through data shown by the flow sensor, if the reading of the flow sensor is increased, the coal seam is possibly cracked, and a water injection nozzle is closed; the control platform is used for controlling the valve and adjusting the water injection amount of each section of hole; the gas collecting bottle is used for collecting gas displaced by water injection and extracted gas, and the gas collecting amount is determined by observing the reading of the flowmeter.
The steel frame 5 is used for fixing a hydraulic oil cylinder, and the hydraulic oil cylinder applies confining pressure to the coal sample model to simulate the actual stress condition of the actual coal body; the coal sample is processed into a cuboid, and a concrete layer with the thickness of about 30cm is wrapped on the outer layer of the cuboid, so that the coal body is uniformly stressed in the loading process.
In the specific experiment, the method is carried out according to the following steps:
firstly, taking a large amount of coal samples, grinding the coal into powder and pressing the powder and water into water with the size of 150m under the conditions that the ratio of the coal powder to the water is 1:2 and the pressure is 30MPa3And (3) coating a concrete layer with the thickness of 30cm on the outer layer of the pressed coal model. Then perforating and injecting gas and CO at the side end of the coal model2Allowing gas and CO to flow2Adsorbing in the pores of the briquette, and sealing the pores with coal and cement slurry. And then 3 single-shaft hydraulic presses are added at the top end and two opposite sides of the model, 25MPa of pressure is applied at the upper end, and 15MPa of pressure is applied at two sides, so that the underground condition of the coal mine is simulated to the maximum extent.
And step two, connecting the drilling machine to a power supply, switching on the power supply, and using the drilling machine to drill holes on the coal model, wherein the hole diameter is about 40 mm. After the water injection hole is drilled, inserting a sleeve into the water injection hole, connecting a sleeve gas extraction pipe to a gas extraction pump, and connecting the gas extraction pump to a gas collecting bottle; the water injection pipe is connected to the water pump, and the other end of the water pump is connected and inserted into the reservoir; the wires of the sensor are then connected to the console.
And step three, starting the hole packer, wherein the casing used by the method is one hole packer every 5 meters. And then, starting the gas extraction pump to completely extract gas, controlling the extraction time according to the gas sensor, closing the extraction pump after extraction is finished, then starting the water injection pump, and controlling the valve through the console according to the reading of the flow sensor. Injecting water in one section.
And step four, when the first section is injecting water, the reading of the flow sensor is observed, and when the flow sensor is increased or not decreased, the water injection pump is closed, so that a certain crack hole exists in the coal seam, and the water injection is not necessary. Then the next section of water injection pipe is replaced for water injection. And when the gas sensor changes, starting the gas extraction pump, closing the gas extraction pump when the reading of the sensor is normal after extracting for a period of time, and then continuing to inject water. The gas extraction and water injection of the device can be carried out discontinuously at the same time, the gas pressure can be reduced under the maximum condition that gas extraction is carried out at a distance from water injection at a distance, and the water injection effect is improved.
And step five, the injection and extraction sequence of the first water injection hole and the lower water injection hole is different, and water injection of one hole starts extraction of the next hole, so that an internal circulation can be formed, and the gas pressure can be reduced to the maximum extent. Through the comparison of the water injection effect of the water injection device and the common water injection device, the device expands the water injection distribution area of the coal body by 2 times, increases the water content of the coal body by 20 percent, and reduces the strength of the coal briquette by 2 times compared with the common water injection. The effect of the device is very obvious.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (4)
1. An integrated experimental method for preventing and controlling coal mine composite power disasters is characterized by comprising the following steps:
1) forming a coal sample model and an experimental environment:
1.1) making a coal sample model: taking a coal sample, grinding the coal into powder, mixing the powder with water according to the mass ratio of 1:2, and pressing to form a coal sample model (10); coating a concrete outer layer (7) on the outer layer of the prepared coal sample model (10);
1.2) simulation environment: perforating and injecting gas and CO into the coal sample model (10)2Allowing gas and CO to flow2Adsorbing in pores of briquette for 1-2 days, and sealing the pores with coal and cement slurry; a pressure mechanism is arranged outside the model to apply pressure to the coal sample model (10) so as to simulate the underground condition of the coal mine;
2) preparation of the experiment:
2.1) sequentially drilling a plurality of injection and production holes on the coal sample model from top to bottom, wherein the interval of each water injection hole (8) is 2 m;
2.2) inserting a perforated sleeve (9) which is externally provided with a pipe sealer (18), a flow sensor (13) and a gas sensor (14) and internally provided with a gas extraction pipe (15) and a water injection pipe (16) into the injection and production hole; connecting a gas extraction pipe (15) to a gas extraction pump (2), and connecting the gas extraction pump (2) to a gas collection bottle (1); the water injection pipe is connected to the water pump (4), and the other end of the water pump (4) is connected and inserted into the water storage tank (3); the electric wires of the flow sensor (13) and the gas sensor (14) are connected to the console (12);
3) experiment:
3.1) starting the gas extraction pump (2) to begin to extract gas comprehensively, and stopping the gas extraction pump (2) when the reading of the gas sensor (14) is changed from a low-concentration indicator lamp to a medium-high concentration; then, the water pump (4) is opened, and according to the reading of the flow sensor (13), a valve at the water outlet of the water injection pipe (16) is controlled by the console to perform sectional water injection;
3.2) when water is injected, the reading of the flow sensor (13) is observed, when the flow sensor (13) is increased or not decreased, a certain crack hole exists in the coal seam, a valve at the water outlet of the section is closed, and the water injection of the section is stopped; then the next section of water injection pipe is replaced for water injection; when the gas sensor (14) rises to the high-concentration indicating lamp, stopping water injection, turning on the gas extraction pump (2), turning off the gas extraction pump when the reading of the gas sensor (14) falls back to the low-concentration indicating lamp after extraction for a period of time, and continuing water injection;
3.3) the injection and extraction sequences of adjacent injection and extraction holes are different, and water injection of one injection and extraction hole starts first and extraction of the next injection and extraction hole starts first, so that internal circulation is formed;
4) and (4) conclusion: after the experiment is finished, the reading of the gas collecting bottle is observed, the gas emission quantity is determined, the gas emission quantity after water injection is 0.53 times more than that of the common water injection mode, the time spent by the gas emission quantity after water injection is shortened by 1.1 times compared with that of the common water injection mode, and the water injection effect is obviously improved;
the pressing mechanism is hydraulic oil cylinders (6) arranged at the top and two sides of the coal sample model (10), the hydraulic oil cylinders (6) at the top apply 25MPa pressure to the coal sample model (10), and the hydraulic oil cylinders (6) at the two sides apply 15MPa pressure to the coal sample model (10);
the volume of the coal sample model (10) is 150m3And the thickness of the concrete outer layer (7) is 30 cm.
2. An experimental device used in the experimental method for integrally preventing and treating the coal mine composite dynamic disaster in claim 1 is characterized in that: comprises a coal sample model (10) which is externally wrapped with a concrete outer layer (7); the injection and production hole (8) penetrates into the coal sample model (10) from the side surface, a perforated sleeve (9) provided with a pipe sealer (18) outside extends into the injection and production hole (8), and water outlet holes are uniformly distributed on the perforated sleeve (9); a water injection pipe (16) and a gas extraction pipe (15) are arranged in the sleeve (9) with the hole; the position of a nozzle on the water injection pipe (16) corresponds to the position of a water outlet hole of the sleeve pipe (9) with the hole; a flow sensor (13) is arranged at the position of the water outlet hole; the coal sample coal sampling device is characterized in that a gas collecting inlet leading to the coal sample model (10) is formed in the gas extracting pipe (15), and a gas sensor (14) is arranged at the gas collecting inlet.
3. An experimental device used in the experimental method for integrally preventing and treating the coal mine composite dynamic disaster in claim 2 is characterized in that: and a water injection inlet of the water injection pipe (16) is sequentially connected with an external water pump (4) and an external water storage tank (3).
4. An experimental device used in the experimental method for integrally preventing and treating the coal mine composite dynamic disaster in claim 2 is characterized in that: and a gas outlet of the gas extraction pipe (15) is sequentially connected with an external gas extraction pump (2) and a gas collection bottle (1).
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| CN110646583B (en) * | 2019-10-09 | 2022-02-22 | 中煤科工集团重庆研究院有限公司 | Method and device for coal seam water injection similar simulation test |
| CN110646584B (en) * | 2019-10-09 | 2021-09-24 | 中煤科工集团重庆研究院有限公司 | Similar simulation method and device for coal seam water injection hole sealing test |
| CN114909133A (en) * | 2022-06-20 | 2022-08-16 | 中国矿业大学 | Coal seam water injection device for preventing rock burst of coal mine |
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| CN103410568B (en) * | 2013-08-27 | 2015-05-13 | 辽宁工程技术大学 | Dynamic mine disaster integral early warning method and device |
| CN104330835A (en) * | 2014-10-30 | 2015-02-04 | 河南理工大学 | Testing system for coal containing methane hybrid dynamic disaster working surface in predicting laboratory |
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| CN109538198B (en) * | 2018-11-12 | 2022-06-14 | 辽宁大学 | Experimental device for preventing and treating coal seam disaster gas injection bubble water and punching integration and application |
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