CN112430457A - Gas dissolving composition, dissolving agent and application thereof - Google Patents
Gas dissolving composition, dissolving agent and application thereof Download PDFInfo
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- CN112430457A CN112430457A CN202011311686.8A CN202011311686A CN112430457A CN 112430457 A CN112430457 A CN 112430457A CN 202011311686 A CN202011311686 A CN 202011311686A CN 112430457 A CN112430457 A CN 112430457A
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- 239000003795 chemical substances by application Substances 0.000 claims abstract description 41
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Abstract
The invention provides a gas dissolving composition, a dissolving agent and application thereof, wherein the gas dissolving agent comprises the following components in parts by weight: 25-50 parts of liquid-state gas-philic bacterium liquid, 1-2 parts of biological enzyme and 5-20 parts of water, wherein the pH value of the gas desolvation is 4.5-5.0. The coal mine gas outburst elimination method comprises the following steps: step 1, designing a liquid injection drilling scheme according to the geological condition of a coal mine working face; step 2, constructing a liquid injection hole; step 3, hole sealing; and 4, injecting the gas dissolving agent from the liquid injection hole to perform gas dissolving. The gas outburst elimination solvent and the underground coal mine outburst elimination method are subjected to field tests in 11036 transportation lanes of the Panzhihua coal mine of Chongqing research institute Limited company of the Zhongguo chemical group and No. 1 coal seams of 1105 transportation lanes of the Panzhou old sand field coal mine of Panzhou city coal development company, and the results prove that the gas outburst elimination effect is good, the period is short, the traditional gas drainage time and the construction of a gas drainage roadway are greatly reduced, the production cost is saved for the coal mine, and the production efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of luminescent material preparation, and particularly relates to a gas dissolving composition, a dissolving agent and application thereof.
Background
The coal mine production is mainly underground operation, has many unsafe factors, is directly threatened by disasters such as gas, coal dust, water, fire, electricity, a roof and the like, and has the accidents of electromechanics, transportation, lifting, blasting and the like which also restrict the safety of the coal mine production. The casualties caused by gas explosion are the most serious and the most fearful. The method for treating coal mine gas in China mainly comprises the following steps: gas drainage, hydraulic slotting, bottom drainage lane, coal seam water injection, gas discharge, ventilation enhancement, fire source detonation prevention, protective layer mining and the like. However, these traditional treatment methods have high production cost, low mining efficiency, high management difficulty and low safety, are very easy to cause explosion accidents, and cannot guarantee the personal safety of operators. Therefore, a new safe and efficient coal mine gas explosion outburst treatment method is urgently needed to be developed.
Disclosure of Invention
Aiming at the problems in the existing coal mine gas treatment technology, the invention aims to provide a gas dissolving composition, a dissolving agent and application thereof.
In order to achieve the above purpose, the invention provides the following technical scheme:
in a first aspect, the invention provides a gas-dissolving composition, which comprises liquid mash gas-philic liquid and biological enzyme.
Further, the biological enzyme includes at least one of methane monooxygenase, methanol dehydrogenase, formaldehyde dehydrogenase, and formate dehydrogenase.
In a second aspect, the invention provides a varesplume, which comprises the following components in parts by weight: 25-50 parts of liquid-state gas-philic bacterium liquid, 1-2 parts of biological enzyme and 5-20 parts of water, wherein the pH value of the gas desolvation is 4.5-5.0.
Further, the preparation method of the gas antisolvent comprises the following steps: the liquid-state gas-philic bacterium liquid, the biological enzyme and the water are uniformly mixed according to the weight part of the gas dissolving agent.
In a third aspect, the invention provides the application of the gas dissolving composition and the dissolving agent in coal mine gas dissolving.
In a fourth aspect, the invention provides a coal mine gas outburst elimination method, which comprises the following steps:
step 1, designing a liquid injection drilling scheme according to the geological condition of a coal mine working face;
and 4, adjusting the injection pressure, and injecting the gas dissolving agent from the injection hole to dissolve the gas.
Further, the process of constructing the liquid injection hole in the step 2 comprises: constructing a liquid injection hole at a distance of 5m from the normal line of the coal seam on the coal mine working face, wherein the distance from the bottom of the liquid injection hole on the rock cross-cut coal uncovering working face to a top plate or a bottom plate is 0.5 m; the distance between the coal uncovering liquid injection hole bottom of the coal face and the top plate or the bottom plate is 0.5-1.0 meter; the first hole is 50m away from the cutting hole of the working surface (the upper air way and the lower air way are staggered by 5 m); the depth of the hole is one half of the length of the working surface and is reduced by 5 meters; drilling holes in the direction parallel to the stoping working surface and towards a transportation roadway or a return air roadway along the coal seam; the aperture is more than 75 mm.
Further, the hole sealing distance is more than 9 m.
Further, the control conditions for adjusting the injection pressure in the step 4 are as follows: the initial liquid injection pressure is 4-6 MPa, and the pressure control time is 30 min-1 h; and raising the liquid injection pressure to 8-16 MPa, and under the liquid injection pressure, until the liquid injection is finished.
Compared with the prior art, the method has the following outstanding advantages and positive effects:
the gas dissolving agent and the outburst elimination method are applied to a Panzhihua coal mine 11036 transportation lane of Chongqing research institute Limited company of Zhongkaihou chemical group and a Panzhou city coal development company, Panxian old sand field coal mine 1105 transportation laneCoal seam No. 1All the on-site tests are carried out, and the results prove that the gas outburst elimination effect is good, the period is short, the traditional gas pumping and drainage time and the construction of a gas pumping and drainage roadway are greatly reduced, the production cost is saved for a coal mine, and the production efficiency is improved.
Drawings
FIG. 1 is a schematic view showing injection of a gas desolvation agent according to embodiments 4 and 5 of the present invention, wherein 1-an emulsification pump, 2-a water tank, 3-a high-pressure infusion tube with a diameter of 19mm, 4-a high-pressure infusion tube with a diameter of 10mm, 5-an injection hole, 6-a hole packer, 7-a support rod, 8-a water meter, 9-a well sewer pipe, and 10-a switch.
Detailed Description
The liquid gasophiles adopted in the implementation of the invention are purchased from gas desolventizer produced by Luoyang Tenghui Biotech Limited.
The biological enzymes (methane monooxygenase, methanol dehydrogenase, formaldehyde dehydrogenase and formate dehydrogenase) employed in the practice of the present invention were customized by Hebei division, a company Limited of the institute of geophysical exploration, Mitsuka, Beijing.
In the description of the present invention, it is to be noted that those whose specific conditions are not specified in the examples are carried out according to the conventional conditions or the conditions recommended by the manufacturers. The reagents or instruments used are not indicated by the manufacturer, and are all conventional products available commercially.
The technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. It is to be understood that the described embodiments are merely a few embodiments of the invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The embodiment provides a mash gas dissolving agent, which comprises the following components in parts by weight: 25 parts of liquid-state gas-philic bacterium liquid, 1 part of biological enzyme and 8 parts of water, wherein the pH value of the gas desolventizer is 4.5. The preparation method of the gas desolventizer comprises the following steps: after the components are mixed according to the weight parts, the liquid-state gas-philic bacterium liquid, the biological enzyme and the water are uniformly mixed, and the microbial fuel is obtained.
Example 2
The embodiment provides a mash gas dissolving agent, which comprises the following components in parts by weight: 35 parts of liquid-state gas-philic bacterium liquid, 1.5 parts of biological enzyme and 15 parts of water, wherein the pH value of the gas desolvation is 4.7. The preparation method of the gas desolventizer comprises the following steps: after the components are mixed according to the weight parts, the liquid-state gas-philic bacterium liquid, the biological enzyme and the water are uniformly mixed, and the microbial fuel is obtained.
Example 3
The embodiment provides a mash gas dissolving agent, which comprises the following components in parts by weight: 50 parts of liquid-state gas-philic bacterium liquid, 2 parts of biological enzyme and 20 parts of water, wherein the pH value of the gas desolventizer is 4.6. The preparation method of the gas desolventizer comprises the following steps: after the components are mixed according to the weight parts, the liquid-state gas-philic bacterium liquid, the biological enzyme and the water are uniformly mixed, and the microbial fuel is obtained.
Example 4
The embodiment provides a coal mine gas outburst elimination method, which adopts the gas desolvation in the embodiment 1, and comprises the following specific steps:
test site: the Guizhou noble energy share invests in the limited climbing flower coal mine 11036 haulage roadway.
The experimental scheme is as follows: according to the gas geological conditions of the climbing flower coal mine of Guizhou noble energy share investment Limited company and the arrangement condition of gas drainage holes, a gas digestion treatment technical research test is implemented in a 11036 transport lane. 8 drill holes (4 drill holes in the upper layer and the lower layer) are arranged in the upper layer and the lower layer of the No. 3 coal seam of the 11036 transport lane, namely, the No. 1-8 drill holes are arranged in the upper layer and the lower layer, the drill holes control the upper wall of the lane to be 20 meters and the lower wall to be 10 meters, and the range of 50 meters ahead of tunneling is controlled.
The specific test process is as follows:
step 1, original gas parameter testing
Parameter measurement is carried out on the 3# coal seam of the Panzhihua coal mine according to Chongqing research institute Co., Ltd of the Zhongshikou chemical group, and a report of 'Panzhihua coal mine mined coal seam gas basic parameter measurement technical report' is submitted, wherein the 3# coal seam mined by the Panzhihua coal mine is a coal and gas outburst coal seam, and the basic parameters are shown in Table 1.
TABLE 13 basic parameter table for coal seam
| Coal seam numbering | Coal bed gas pressure P (MPa) | Coal bed gas content (m)3/t) | Coal |
| 3# | 1.33 | 11.54 | Is provided with |
Through parameter analysis of the No. 3 coal seam mined by the Panzhihua coal mine, the Panzhihua coal seam No. 3 coal seam has high gas content and is a coal seam with coal and gas outburst danger.
1.11036 transportation lane liquid injection drilling arrangement scheme
Because the 3# coal seam of the Panzhihua coal mine is layered from top to bottom, holes must be distributed in the upper and lower layers respectively to meet the requirement of liquid injection. In addition, in order to ensure that the injected liquid medicine can be uniformly diffused to the control range required by gas outburst prevention, the solution is determined by additionally arranging the liquid injection drill holes. Therefore, the scheme of the arrangement of the liquid injection and drilling is as follows: 8 drill holes (4 in each of the upper and lower layers) are arranged in the upper and lower layers of the No. 3 coal seam, namely the No. 1-8 drill holes, the upper side of the tunnel is controlled to be 20 meters, the lower side of the tunnel is controlled to be 10 meters, and the range of the front of the tunnel is controlled to be 50 meters.
2 leakage stopping scheme
Before the 11036 transportation lane adopts the gas dissolving technology, regional outburst prevention measures of cross-layer drainage drill holes are constructed in four 3# layer roof gas drainage lanes, and supplementary measures of bedding drainage drill holes are constructed on the working face of the 11036 transportation lane and a drilling site. When the gas dissolving technology is adopted, reinforcement measures must be taken to effectively prevent the injected gas dissolving agent from leaking outwards. Therefore, after the construction of the liquid injection drill hole is finished, the working surface of the 11036 transportation roadway is subjected to slurry spraying, and after the slurry spraying is finished, the liquid injection drill hole is subjected to slurry injection. And when the injected slurry is completely solidified and the injection of the disinfectant is started, all cross-layer drill holes of the affected area of the four 3# layer roof gas roadway are closed, so that the injected disinfectant is prevented from leaking, and the injection effect is ensured.
3 construction process
And (3) construction liquid injection and drilling:
(1) the construction is annotated liquid and is bored 8, and the concrete requirement is: constructing a liquid injection hole at a distance of 5m from the normal line of the coal seam on the coal mine working face, wherein the distance from the bottom of the liquid injection hole on the rock cross-cut coal uncovering working face to a top plate or a bottom plate is 0.5 m; the distance between the coal uncovering liquid injection hole bottom of the coal face and the top plate or the bottom plate is 0.5-1.0 meter; the first hole is 50m away from the cutting hole of the working surface (the upper air way and the lower air way are staggered by 5 m); the depth of the hole is one half of the length of the working surface and is reduced by 5 meters; drilling holes in the direction parallel to the stoping working surface and towards a transportation roadway or a return air roadway along the coal seam; the aperture is more than 75 mm.
(2) After the drilling construction is finished, a 4' perforated pipe is timely used for descending to the bottom of a hole, Marilsan and cotton yarn are used for hole sealing, a grouting pipe with the thickness of 16mm is pre-buried, and the hole sealing depth is 9 m.
(3) And after the drilling construction is finished and the hole sealing is finished, spraying the slurry on the working surface.
(4) And after the guniting is finished and solidified, grouting by using a 2ZBQ24/10 type pneumatic grouting pump and P42.5 cement (the water and the cement are prepared according to the ratio of 0.8-1.2: 1 during stirring).
(5) After the grouting is completely solidified, the desolvation agent in the embodiment 1 is injected for 2 times, each time of injection is 8 hours, and the time interval of injecting the desolvation agent for two times is 16 hours.
After 16 hours of last injection of the gas dissolving agent, constructing a test drill hole to measure basic parameters of the coal bed gas after injection of the gas dissolving agent, and measuring that the gas content of the test drill hole is 8.3469m3The maximum value of/t and K1 is
Exceeding the requirement of outburst prevention regulation.
And (4) immediately injecting the desolvation again after the coal bed gas content and the K1 index exceed the outburst prevention regulation. After the injection is completed, the highest value of K1 is considered
During the later tunneling operation, the maximum value of the coal circulation K1 is
The indexes are below the safety value and do not exceed the requirement of outburst prevention.
1. After the drilling construction is completed, the pipe hoop for the 4-minute galvanized steel pipe is connected, the pipe hoop is connected while being connected, the pipe hoop is conveyed into the hole, when the distance between the 4-minute galvanized steel pipe and the hole opening is 20m, the polyurethane hole sealing agent is bound on the 4-minute galvanized steel pipe, the isolating strip of the polyurethane hole sealing agent is taken out, the polyurethane hole sealing agent is poked in the hole rapidly, the hole sealing length of the polyurethane is not less than 2m, the pipe is continuously connected until the 4-minute galvanized steel pipe extends to the bottom of the hole, and meanwhile, the other end of the pipe extends out of the drilled hole. The hole sealing distance is more than 9 m.
2. And after the polyurethane at the position of 20m in the hole is reacted and blocked, drilling the hole, mounting a grouting pipe, manufacturing the grouting pipe by using 6-branch galvanized steel pipes, connecting each 3m galvanized steel pipe by using the same 6-branch galvanized steel pipe by using a pipe hoop, and conveying the pipe into the hole while connecting until the 6-branch galvanized steel pipe extends to the polyurethane blocking position of 20 m.
3. And then a 6-minute galvanized pipe is used as a slurry return pipe to be arranged in the hole, the polyurethane hole sealing agent is arranged at a position 3m away from the hole opening, the hole sealing length is not less than 1m, and finally 2m is sealed by cement mortar.
4. And connecting the 6-portion grouting galvanized pipe with a pipeline, and finally connecting the 6-portion grouting galvanized pipe to a grouting pump to start grouting mortar.
5. The grouting material is prepared by mixing 425# Portland cement and an expanding agent according to a certain proportion, stirring the mixture in water to form cement mortar, injecting the cement mortar into the hole through a grouting pump, stopping grouting when the grout return pipe starts to return grout, and performing the next operation when the cement mortar is solidified and meets the strength requirement.
1. Liquid injection equipment and system
The liquid injection system comprises an emulsion pump, a water tank, a pressure gauge, a high-pressure pipeline, a hole packer and the like, and is shown in figure 1.
2. Process flow
(1) Pipeline connection: the used pipes are connected as follows: the emulsion pump is connected with a high-pressure infusion tube with the tube diameter of 19mm, and the high-pressure infusion tube with the tube diameter of 19mm is connected with a high-pressure infusion tube with the tube diameter of 10mm, a hole packer and a grouting tube through a tee joint.
(2) Preparing a gas dissolving agent: a gas suppressor was prepared according to example 1.
(3) Operation of an emulsification pump: starting an emulsion pump after equipment inspection, wherein the initial injection pressure is 4-6 MPa, and the pressure control time is 30 min-1 h; and after the pressure is adjusted to 9MPa, the valve is opened, and meanwhile, the four liquid injection drill holes are injected with liquid. The pressure of the emulsifying pump is properly adjusted according to the actual situation in the implementation process.
(4) Liquid injection operation: dynamic pressure water injection is adopted, and about 3-4 hours are needed from the beginning of water injection to the end of measures. And (2) discontinuously boosting the pressure by 2MPa, ensuring that the pump pressure reaches the design requirement (generally not more than 16MPa), stabilizing for a period of time, and ensuring that the water quantity of a pump box does not obviously decrease when the wall of the coal seam is sweated and seeped or the pressure is continuously boosted, so that the coal seam is saturated in liquid injection, stopping the pump, closing a pressure relief valve and ending the liquid injection program. And in the liquid injection process, continuously recording the liquid injection pressure and the liquid injection flow of each hole along with the time change curve as a basis for evaluating the liquid injection effect.
Gas dissolving measures and outburst elimination effects: as shown in tables 2-3.
TABLE 2 comparison table of tunneling before and after using gas desolventizer
TABLE 3 comparison of the main gas parameters before and after gas desolvation
1. Index mapping before and after construction
(1) K1 value before solvent injection
The highest k1 value after solvent injection
(2) The effective distance in front of the liquid injection drilling is controlled to be 50 meters, and the upper is controlled to be 20 meters and the lower is controlled to be 10 meters. After the injection liquid is adopted for gas dissolving, the k1 value index is reduced below the safety value, and the actual tunneling is 34.7 meters.
(3) Reason analysis, the gas digestion technology is adopted for eliminating coal bed gas in the digestion, the control range of the construction liquid injection drilling is 50 meters in front of tunneling and 34.7 meters in actual tunneling, the main reason is that 11036 transportation roadway drilling sites and No. 3 layer south gas roadway construction drilling are too many, hole collapse is serious after the drilling construction is finished, a liquid injection sleeve cannot smoothly fall to the bottom of a hole, although a plugging measure is adopted, the plugging effect is still not ideal, and the injected digestion solvent is leaked and cannot permeate into the expected control range.
2. Conclusion
(1) The gas dissolving technology has good effect and is mainly embodied in that the gas is quickly reduced; compared with the construction of drilling and gas drainage, the time is saved (1 cycle only needs 7 days because of the adoption of gas dissolving agent for gas treatment).
(2) Convenient to use, easy operation.
(3) Compared with the gas extraction by drilling, the gas treatment cost is reduced, and the comprehensive benefit is improved.
(4) The gas is treated by the gas dissolving agent, so that the gas is non-toxic and harmless, and has no adverse effect on coal beds and operators.
Example 5
The embodiment provides a coal mine gas outburst elimination method, which adopts the gas desolvation agent in the embodiment 2, and comprises the following specific steps:
test site: panzhou coal development company, Panxian countyOld sand field colliery 1105 transportation laneCoal seam No. 1And the upper wall of the contour line of the roadway is 22.5m and the lower wall is 10m from the opening to the front 24 m-86 m.
According to the analysis of the No. 1 coal bed disclosed by the tunneled 1105 return airway and 1485 transport goalkeeper, the 1105 transport airway tunneling range has simple geological structure, stable coal bed production state and no fault. The thickness of the No. 1 coal seam is 3.5-4.5 m, the average thickness is 4.0m, the inclination angle of the coal seam is 55 degrees, and the coal mainly comprises semi-bright type, lump coal and pulverized coal. The lithology of the coal seam roof is argillaceous siltstone, siltstone and siltstone mudstone; the lithology of the bottom plate is silty mudstone, siltstone and mudstone.
Producing Zi from Qian coal [2009]252 "batch recovery of 2008. Laosha Water City mine gas grade identification report", Laosha coal mine absolute gas emission amount is 2.18m3Permin, relative gas emission 16.43m3And/min, repeating the steps as protruding mine.
The experimental scheme is as follows: 1105 transportation lane opening is fixed at 1485 transportation stone door 1# coal seam uncovering point, according to azimuth 129 degrees, 3 per mill's slope is tunneled along the coal seam trend, tunnel design length 372m, tunnel net section 10.2m2The driving face adopts blasting excavation, the permanent support of the roadway adopts U-shaped shed support, and the scraper and the belt conveyor are used for transportation.
The specific test process comprises the following steps:
step 1, original gas parameter testing
According to the original design of old sandy field coal mine, the design of old sandy field coal mine safety facilities and the report on the on-site measurement of gas and carbon dioxide of old sandy field coal mine in Bo Guoku town, Pan county, the original gas content of the 1# coal seam in the +1485m section in the mining area of old sandy field coal mine is as follows: 12.56m3T, firmness factor 0.45, gas pressure 0.78MPa measured on site.
Through parameter analysis of the 1# coal seam mined by the old sandy field coal mine, the 1# coal seam of the old sandy field coal mine has high gas content and is a coal seam with coal and gas outburst danger.
The influence radius of the gas desolvation can reach more than 15m, according to the control requirement of strip drilling of coal layer tunneling in the regulations for preventing and controlling coal and gas outburst, and in consideration of the special condition of the coal layer of the 1105 transportation lane working face, 5 liquid injection drilling holes are designed and arranged on the working face by using the gas ablation technology, the distance between the drilling holes and the tunneling front is controlled to be 60m, the maximum distance between final holes is designed to be 10m, and the ranges of an upper wall 25m and a lower wall 10m of the roadway are controlled.
1, construction drilling requirement:
1.1 constructing a liquid injection hole at a distance of 5m from the normal line of the coal seam on a coal mine working face, and enabling the distance from the hole bottom of the liquid injection hole on the rock cross-cut coal uncovering working face to a top plate or a bottom plate to be 0.5 m; the distance between the coal uncovering liquid injection hole bottom of the coal face and the top plate or the bottom plate is 0.5-1.0 meter; the first hole is 50m away from the cutting hole of the working surface (the upper air way and the lower air way are staggered by 5 m); the depth of the hole is one half of the length of the working surface and is reduced by 5 meters; drilling holes in the direction parallel to the stoping working surface and towards a transportation roadway or a return air roadway along the coal seam; the aperture is more than 75 mm. When the thickness of the coal seam exceeds 6m and a top coal caving one-time mining full-height coal mining method is adopted, one of every two holes can be tilted upwards, and the final hole falls at a position 0.5-1.0 m away from the top plate of the coal seam. In addition, the aperture of the liquid injection drill hole is not less than 89mm, coal rock powder in the drill hole must be blown clean, and the hole sweeping must be in place.
1.2 during the construction drilling, the number of meters of a rock section, the time when the coal bottom plate is seen and the time when the coal top plate is seen must be closely observed, and records are made to be used as actual hole sealing data references.
1.3 other notes: during construction, fault and crack must be reported in time, and after negotiation, treatment is carried out. During construction, the deviation of the drilled hole from the design direction is large, or the deviation from the design parameters is large, so that the conditions of waste holes and the like occur, and the drilled hole cannot be processed privately and must be processed according to the method of a manufacturer technician.
And 1.4, stopping drilling after the hole is drilled to the coal seam roof, and preventing drilling.
And testing parameters such as original gas content of the coal seam and other parameters such as gas pressure. After the measures, a calibration hole is drilled between the two groups of holes, the distance between the calibration hole and the bottom of the liquid injection hole is not more than 5m, and corresponding indexes are measured for comparing the outburst elimination effect.
Adopting a cement mortar hole sealing process for construction:
1. after the drilling construction is completed, the pipe hoop for the 4-minute galvanized steel pipe is connected, the pipe hoop is connected while being connected, the pipe hoop is conveyed into the hole, when the distance between the 4-minute galvanized steel pipe and the hole opening is 20m, the polyurethane hole sealing agent is bound on the 4-minute galvanized steel pipe, the isolating strip of the polyurethane hole sealing agent is taken out, the polyurethane hole sealing agent is poked in the hole rapidly, the hole sealing length of the polyurethane is not less than 2m, the pipe is continuously connected until the 4-minute galvanized steel pipe extends to the bottom of the hole, and meanwhile, the other end of the pipe extends out of the drilled hole. The hole sealing distance is more than 9 m.
2. And after the polyurethane at the position of 20m in the hole is reacted and blocked, drilling the hole, mounting a grouting pipe, manufacturing the grouting pipe by using 6-branch galvanized steel pipes, connecting each 3m galvanized steel pipe by using the same 6-branch galvanized steel pipe by using a pipe hoop, and conveying the pipe into the hole while connecting until the 6-branch galvanized steel pipe extends to the polyurethane blocking position of 20 m.
3. And then a 6-minute galvanized pipe is used as a slurry return pipe to be arranged in the hole, the polyurethane hole sealing agent is arranged at a position 3m away from the hole opening, the hole sealing length is not less than 1m, and finally 2m is sealed by cement mortar.
4. And connecting the 6-point grouting galvanized pipe with a pipeline, and finally connecting the 6-point grouting galvanized pipe to a grouting pump to start grouting.
5. The grouting material is prepared by mixing 425# Portland cement and an expanding agent according to a certain proportion, stirring the mixture in water to form cement mortar, injecting the cement mortar into the hole through a grouting pump, stopping grouting when the grout return pipe starts to return grout, and performing the next operation when the cement mortar is solidified and meets the strength requirement.
1. Liquid injection equipment and system
The liquid injection system comprises a water injection pump, a water tank, a pressure gauge, a high-pressure pipeline, a hole sealing device and the like, and is shown in figure 1.
2. Process flow
(1) Pipeline connection: the same as in example 4.
(2) Preparing a gas dissolving agent: a gas suppressor was prepared according to example 2.
(3) Operation of an emulsification pump: starting an emulsion pump after equipment inspection, wherein the initial injection pressure is 4-6 MPa, and the pressure control time is 30 min-1 h; and after the pressure is adjusted to 8MPa, the valve is opened, and meanwhile, 5 liquid injection drill holes are injected with liquid. The pressure of the emulsifying pump is properly adjusted according to the actual situation in the implementation process.
(4) Liquid injection operation: after simultaneous injection of 5 boreholes for 1 hour, 2 of these boreholes were closed (2#, 4# boreholes). Injecting liquid (1#, 3#, 5#) for the other 3 drill holes, and exchanging after 2 hours; and (4) continuously injecting liquid for 2 hours after exchange, adjusting the pressure to 15Mpa, and injecting liquid into five drill holes simultaneously until the proportioned desolvation agent is completely injected into the drill holes. And the liquid injection and the ablation are carried out for 48 hours, so that the purpose of gas ablation is achieved.
According to the 1105 transportation lane bedding drilling gas ablation drilling position, 3 core drilling holes are respectively designed on the left side, right front and lower side of the lane contour line to test the regional ablation measure effect.
Gas dissolving measures and outburst elimination effects: as shown in table 4.
And (4) carrying out construction coring and drilling according to the effect inspection design of the regional outburst prevention measures, and sending the core drilling to a test room for measuring the residual gas content and the residual gas pressure of the coal bed gas after underground analysis. The maximum residual gas content of 3.5304m is measured3T, maximum residual gas pressure 0.352 MPa. No prominent signs such as spray holes, clamping drills, top drills and the like are found in the construction drilling.
Table 43 test drill hole main parameter indices are compared as follows:
according to the change of the indexes, the gas dissolving agent and the dissolving method have obvious gas outburst elimination effect.
In conclusion, the invention provides a coal mine 11036 transportation lane of the Panzhihua coal mine of Chongqing research institute Limited company of Zhongyao Ke and a coal mine 1105 transportation lane of the Panzhou city coal development company of the Panzhou old ShatianCoal seam No. 1The field test proves that the gas dissolving agent and the coal mine gas outburst elimination method have good gas outburst elimination effect and short period, greatly reduce the traditional gas drainage time and the construction of a gas drainage roadway, and save the production cost for a coal mineAnd the production efficiency is improved.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (9)
1. A gas-dissolving composition characterized by: comprises liquid mash gas bacteria liquid and biological enzyme.
2. A gas-dissolving composition according to claim 1, wherein: the biological enzyme comprises at least one of methane monooxygenase, methanol dehydrogenase, formaldehyde dehydrogenase and formate dehydrogenase.
3. A gas dissolving agent is characterized in that: the composition comprises the following components in parts by weight: 25-50 parts of liquid-state gas-philic bacterium liquid, 1-2 parts of biological enzyme and 5-20 parts of water, wherein the pH value of the gas desolvation is 4.5-5.0.
4. A gas suppressor as claimed in claim 3, wherein: the preparation method of the gas desolventizer comprises the following steps: the liquid-state gas-philic bacterium liquid, the biological enzyme and the water are uniformly mixed according to the weight part of the gas dissolving agent.
5. Use of a gas-dissolving composition according to claim 1 or 2, or a gas-dissolving agent according to claim 3 or 4, for coal mine gas extinction.
6. A coal mine gas outburst elimination method is characterized by comprising the following steps: the method comprises the following steps:
step 1, designing a liquid injection drilling scheme according to the geological condition of a coal mine working face;
step 2, constructing a liquid injection hole;
step 3, hole sealing;
and 4, adjusting the injection pressure, and injecting the gas dissolving agent from the injection hole to dissolve the gas.
7. The coal mine gas outburst elimination method according to claim 6, wherein: the process of constructing the liquid injection hole in the step 2 comprises the following steps: constructing a liquid injection hole at a distance of 5m from the normal line of the coal seam on the coal mine working face, wherein the distance from the bottom of the liquid injection hole on the rock cross-cut coal uncovering working face to a top plate or a bottom plate is 0.5 m; the distance between the coal uncovering liquid injection hole bottom of the coal face and the top plate or the bottom plate is 0.5-1.0 meter; the first hole is 50m away from the working surface; the depth of the hole is one half of the length of the working surface and is reduced by 5 meters; drilling holes in the direction parallel to the stoping working surface and towards a transportation roadway or a return air roadway along the coal seam; the aperture is more than 75 mm.
8. The coal mine gas outburst elimination method according to claim 6, wherein: and the hole sealing distance in the step 3 is more than 9 m.
9. The coal mine gas outburst elimination method according to claim 6, wherein: the control conditions for adjusting the injection pressure in the step 4 are as follows: the initial liquid injection pressure is 4-6 MPa, and the pressure control time is 30 min-1 h; and raising the liquid injection pressure to 8-16 MPa, and under the liquid injection pressure, until the liquid injection is finished.
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