CN102352768B - Gas drainage method and equipment with alternative drainage - Google Patents
Gas drainage method and equipment with alternative drainage Download PDFInfo
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- CN102352768B CN102352768B CN 201110317591 CN201110317591A CN102352768B CN 102352768 B CN102352768 B CN 102352768B CN 201110317591 CN201110317591 CN 201110317591 CN 201110317591 A CN201110317591 A CN 201110317591A CN 102352768 B CN102352768 B CN 102352768B
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 238000005553 drilling Methods 0.000 claims abstract description 36
- 239000003245 coal Substances 0.000 claims abstract description 26
- 238000005086 pumping Methods 0.000 claims description 92
- 238000000605 extraction Methods 0.000 claims description 69
- 230000035699 permeability Effects 0.000 description 6
- 238000003825 pressing Methods 0.000 description 4
- 238000005422 blasting Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000003795 desorption Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 230000001914 calming effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000009183 running Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK 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
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- Drilling And Exploitation, And Mining Machines And Methods (AREA)
Abstract
The invention discloses a gas drainage method and equipment with alternative drainage, which are applicable to increasing the drainage diameter of a gas drainage drilling hole and improving the total gas drainage amount of the drilling hole. A main drainage pipeline at the front part and the rear part of a gas pump is connected with bypass pipelines in parallel by a front three-way ball valve anda rear three-way ball valve; the main drainage pipeline at the front part of the front three-way ball valve is connected with a high-pressure gas storage tank; the rear part of the high-pressure gas storage tank is connected with a gas filling pipeline controlled by a gas filling control ball valve; the gas filling pipeline is connected onto the main drainage pipeline between the rear three-way ball valve and the gas pump; a gas drainage pipe in the gas drainage drilling hole is connected with the main drainage pipeline to carry out gas drainage; in the operation process of the gas pump, by controlling the states of the front three-way ball valve, the rear three-way ball valve, the gas filling control ball valve and an outlet control ball valve, extracted gas flow and pressed-in gas flow occur alternatively on the gas drainage drilling hole, the cracks of coal bodies around the drilling hole are enlarged continuously under the action of alternative stress and develop gradually towardsthe deep part, so that the total gas drainage amount of the drilling hole is improved. The method and the equipment are simple, the operation is convenient and the cost is low.
Description
Technical field
The present invention relates to a kind of taking out and press gas pumping method and equipment alternately, be particularly useful for increasing the extraction radius of mash gas pumping drilling, the gas pumping total amount of raising boring.
Background technology
Gas pumping is that the negative pressure of utilizing the gas pump to produce is composed the gas that exists in the coal seam by the mash gas pumping drilling extraction.Through long-time extraction, coal-bed gas pressure, content all can reduce significantly, so gas pumping is the essential measure of control coal mine gas disaster accident.Threaten for eliminating gas, guarantee mine safety production, the projecting mine of China, highly gassy mine and part low gaseous mine have all been carried out gas pumping engineering widely.
Behind the mash gas pumping drilling construction, stress of certain limit coal body obtains discharging and deforming around it, produces the different crack of a large amount of geometrical properties in the coal body deformation process, and desorption of mash gas and the mobile condition that provides are provided.Gas permeability of coal seam in the cranny development scope is big, be the main gas source of extraction, but this scope is very little, and its radius generally is not more than 5 m.Coal seam outside the cranny development scope is original coal body, and gas permeability is poor, and its tax is deposited gas and is difficult to be drawn out of.Current, the negative pressure that the gas pump produces in the gas pumping process is the continuity negative pressure, namely only has the extraction air-flow that is flowed to the gas pump by the coal seam in gas pumping pipeline and extraction borehole.Therefore one-way gas flow makes the crack around the boring have tendencies toward shrinkage, has limited the crack and has grown to coal seam depth, causes apart from boring gas desorb and the extraction in a large number in original coal seam at a distance, causes the mash gas extraction source of holing less.Based on above-mentioned analysis and engineering practice, when adopting existing gas pumping method, the extraction radius of boring is little, and gas pumping flow and the concentration rate of decay are fast, and effectively the extraction time is shorter.For the coal seam of gas permeability difference, the problems referred to above are more remarkable.
For improving the boring gas permeability in coal seam on every side, mainly adopt technical methods such as fracturing, deep hole blasting at present, yet all have certain problem.As when adopting the fracturing method, though increased the crack in coal seam, after the coal body suction is saturated, its gas permeability reduces, can not accelerate flowing of desorb gas, coal body becomes cement paste that ponding is played in the crack after meeting water in addition, therefore can not improve the gas pumping amount.When adopting the deep hole blasting method, after the loosening blasting, boring gas pumping amount within a short period of time (maximum several days) can increase several times, but it is exhausted to descend soon, and the increase of total gas pumping amount of holing is not remarkable.
Summary of the invention
Technical problem: the objective of the invention is to overcome the weak point in the prior art, provide that a kind of method is simple, facility compact, the hole pumping and mining radius is big, extraction is effective takes out gas pumping method and the equipment alternately of pressing.
Technical scheme: of the present invention taking out pressed gas pumping method alternately, comprises the steps:
A. the extraction main line before and after the coal mine gas pump is by a forward and backward tee ball valve bypass pipe road in parallel, extraction main line in preceding tee ball valve front portion connects the high pressure tank that breather cheek valve is housed, and connect the rear portion connection of a control of export ball valve, high pressure tank in the front portion of high pressure tank by the tonifying Qi pipeline of tonifying Qi control ball valve control, on the extraction main line after the tonifying Qi pipeline is connected between tee ball valve and the gas pump;
B. the gas pumping pipe in the mash gas pumping drilling is connected with the extraction main line and carries out gas pumping;
C. control forward and backward tee ball valve, make that back tee ball valve path A and back tee ball valve path B are connected, preceding tee ball valve path A and preceding tee ball valve path B be connected, close tonifying Qi control ball valve and control of export ball valve, at this moment, gas in the coal seam is gone in the extraction main line through mash gas pumping drilling and gas pumping manifold afflux, then successively through after tee ball valve, gas pump and preceding tee ball valve flow in the high pressure tank;
When the gas pressure in the high pressure tank is elevated to 0.3 MPa, open the control of export ball valve, the gas in the high pressure tank is outwards carried through the extraction main line;
When the gas pressure of high pressure tank is reduced to 0.1 MPa, close the control of export ball valve;
D. behind gas pumping 5～10 min, control forward and backward tee ball valve, make that back tee ball valve path A and back tee ball valve path C are connected, preceding tee ball valve path A and preceding tee ball valve path C be connected, open tonifying Qi control ball valve, close the control of export ball valve, make the gas in the high pressure tank enter the extraction main line through the tonifying Qi pipeline, again through gas pump, preceding tee ball valve, bypass line, after tee ball valve, extraction main line and gas pumping pipe oppositely be pressed in the mash gas pumping drilling, the time that is pressed into gas in the mash gas pumping drilling is 3～5min;
When the gas pressure in the high pressure tank during less than external air pressure, outside air enters in the high pressure tank by breather cheek valve, to satisfy the tolerance that oppositely is pressed in the mash gas pumping drilling;
E. repeating step c, d alternately implement to bleed and calm the anger, and make alternately to occur in mash gas pumping drilling and the gas pumping pipe extracting air-flow out and being pressed into air-flow, are reduced to below 16% until the gas density of extraction, stop to take out pressure.
The described pressure that is pressed into air-flow is 0.03MPa～0.2 MPa.
The gas pumping equipment alternately of pressing of taking out of the present invention, comprise the gas pumping pipe, the extraction main line that links to each other with the gas pumping pipe, be located at the gas pump on the extraction main line, before extraction main line in the front and back of described gas pump is provided with, back tee ball valve, before the warp, back tee ball valve is connected with the bypass line that is in parallel with the gas pump, be connected with high pressure tank on the extraction main line of preceding tee ball valve front portion, the high pressure tank front portion is installed on the control of export ball valve, the rear portion of high pressure tank is provided with and is connected the tonifying Qi pipeline on the extraction main line between back tee ball valve and the gas pump, the tonifying Qi pipeline is provided with tonifying Qi control ball valve, and the bottom of high pressure tank is provided with breather cheek valve.
Beneficial effect: the present invention can effectively increase the extraction radius of mash gas pumping drilling, improves the gas pumping total amount of boring.By the extraction air-flow in mash gas pumping drilling, alternately occurring and being pressed into air-flow, make the effect (alternating stresses) that pucker ﹠ bloat is born in the crack of coal body repeatedly around holing, local fracture takes place after coal body reaches fatigue limit, thereby the crack is constantly enlarged and grows gradually to the deep.After the gas permeability in original coal seam, deep increases, the desorb and being drawn out of gradually of its gas, thus increase the gas pumping radius of boring, and improve the gas pumping total amount of boring.The method and equipment are simple, and is easy to operate, and cost is low, not only increased the gas pumping radius of boring, and improved the gas pumping total amount of boring, has practicality widely.
Description of drawings
Fig. 1 is that of the present invention taking out pressed gas pumping structural representation alternately.
Among the figure: mash gas pumping drilling-1, extract air-flow-2 out, be pressed into air-flow-3, crack-4, gas pumping pipe-5, extraction main line-6, back tee ball valve-7, gas pump-8, bypass line-9, preceding tee ball valve-10, tonifying Qi pipeline-11, tonifying Qi control ball valve-12, high pressure tank-13, breather cheek valve-14, control of export ball valve-15.
The specific embodiment
Below in conjunction with accompanying drawing one embodiment of the present of invention are further described:
Of the present invention taking out pressed gas pumping method alternately, because after mash gas pumping drilling 1 construction finished, the coal body around it in certain limit produced a large amount of cracks 4 simultaneously owing to certain distortion takes place in release, is desorption of mash gas and the mobile condition that provides.At first before the extraction main line 6 of coal mine gas pump 8 front and back passes through, back tee ball valve 10,7 bypass lines 9 in parallel, extraction main line 6 in preceding tee ball valve 10 front portions connects high pressure tank 13, the front portion of high pressure tank 13 connects control of export ball valve 15, the rear portion of high pressure tank 13 connects the tonifying Qi pipeline 12 by 11 controls of tonifying Qi control ball valve, on the extraction main line 6 after tonifying Qi pipeline 12 is connected between tee ball valve 7 and the gas pump 8, breather cheek valve 14 is installed in the bottom of high pressure tank 13, after sending into gas pumping pipe 5 and carry out sealing of hole in the mash gas pumping drilling 1, gas pumping pipe 5 in the mash gas pumping drilling 1 is connected with extraction main line 6, begins to carry out gas pumping by gas pump 8.
Before the control, back tee ball valve 10,7, back tee ball valve path A and back tee ball valve path B are connected, preceding tee ball valve path A and preceding tee ball valve path B are connected, close tonifying Qi control ball valve 11 and control of export ball valve 15, gas in the coal seam is compiled in the inflow extraction main line 6 through mash gas pumping drilling 1 and gas pumping pipe 5, then successively through after tee ball valve 7, gas pump 8 and preceding tee ball valve 10 flow in the high pressure tank 13, the gas flow path is in the extraction system: crack 4 → mash gas pumping drilling, 1 → gas pumping pipe, 5 → extraction main line 6 → back tee ball valve 7 → gas pump 8 → preceding tee ball valve 10 → high pressure tank 13, be extraction air-flow 2 in gas pumping pipe 5 and the mash gas pumping drilling 1 this moment, and system is in the gas pumping state.Bleeding the initial stage in stage, control of export ball valve 15 is closed condition, along with constantly carrying out of extraction, the gas pressure of high pressure tank 13 constantly raises, when the gas pressure in the high pressure tank 13 is elevated to 0.3 MPa, open control of export ball valve 15, the gas in the high pressure tank 13 is outwards carried through extraction main line 6; When the gas pressure of high pressure tank 13 is reduced to 0.1 MPa, close control of export ball valve 15.
Behind gas pumping 5～10 min, before the control, back tee ball valve 10,7, back tee ball valve path A and back tee ball valve path C are communicated, preceding tee ball valve path A and preceding tee ball valve path C communicate, open tonifying Qi control ball valve 11, close control of export ball valve 15, make the gas in the high pressure tank 13 enter extraction main line 6 through tonifying Qi pipeline 12, again through gas pump 8, preceding tee ball valve 10, bypass line 9, back tee ball valve 7, extraction main line 6 and gas pumping pipe 5 oppositely are pressed into mash gas pumping drilling 1, the gas flow path is in the extraction system: high pressure tank 13 → tonifying Qi pipeline 12 → extraction main line 6 → gas pump 8 → preceding tee ball valve 10 → bypass line 9 → back tee ball valve 7 → extraction main line 6 → gas pumping pipe 5 → mash gas pumping drilling 1 → crack 4, in this moment gas pumping pipe 5 and the mash gas pumping drilling 1 for being pressed into air-flow 3, the pressure that is pressed into air-flow 3 is 0.03MPa～0.2 MPa, and the time that is pressed into gas in the mash gas pumping drilling 1 is 3～5min.Be pressed into source of the gas and be the mash gas extraction in the high pressure tank 13, be mainly and prevent that the next one from taking out the mash gas extraction concentration of pressure in the cycle and descending significantly.Gas pressure in high pressure tank 13 is less than external air pressure, and when namely negative pressure state occurring, outside air enters in the high pressure tank 13 by breather cheek valve 14, to satisfy the tolerance that oppositely is pressed in the mash gas pumping drilling 1.
Repeatedly pumping and calming the anger makes alternately to occur in mash gas pumping drilling 1 and the gas pumping pipe 5 extracting air-flows 2 out and being pressed into air-flow 3, is reduced to below 16% until the gas density of extraction, stops to take out pressure.
The gas pumping equipment alternately of pressing of taking out of the present invention, comprise gas pumping pipe 5, the extraction main line 6 that links to each other with gas pumping pipe 5, be located at the gas pump 8 on the extraction main line 6, before the front and back extraction main line 6 of gas pump 8 is provided with, back tee ball valve 10,7, before the warp, back tee ball valve 10,7 are connected with the bypass line 9 that is in parallel with gas pump 8, be connected with high pressure tank 13 on the extraction main line 6 of preceding tee ball valve 10 front portions, the front portion of high pressure tank 13 is installed on control of export ball valve 15, the rear portion of high pressure tank 13 is provided with and is connected the tonifying Qi pipeline 12 on the extraction main line 6 between back tee ball valve 7 and the gas pump 8, tonifying Qi pipeline 12 is provided with tonifying Qi control ball valve 11, be provided with breather cheek valve 14 in the bottom of high pressure tank 13, can realize outside air under certain condition to the one-way flow of high pressure tank 13, and the gas in the high pressure tank 13 can not flow out under any condition; The extraction main line 6 that control of export ball valve 15 connects is the pipeline of outwards carrying gas.Back tee ball valve 7, preceding tee ball valve 10, tonifying Qi control ball valve 11 and control of export ball valve 15 are the electric intelligent control valve, can realize that the state at different time interval is changed automatically.In gas pump 8 runnings, state conversion by back tee ball valve 7, preceding tee ball valve 10 and tonifying Qi control ball valve 11 can change the airflow direction in the extraction main line 6, realizes alternately occurring in gas pumping pipe 5 and the mash gas pumping drilling 1 extracting air-flow 2 out and being pressed into air-flow 3.Back tee ball valve 7 comprises back tee ball valve path A, back tee ball valve path B and back tee ball valve path C, and preceding tee ball valve 10 comprises preceding tee ball valve path A, preceding tee ball valve path B and preceding tee ball valve path C; Back tee ball valve path C is connected bypass line 9 with preceding tee ball valve path C, and back tee ball valve path B is connected with gas pump 8 by extraction main line 6 with preceding tee ball valve path A.
Claims (3)
1. take out pressure gas pumping method alternately for one kind, it is characterized in that comprising the steps:
A. before the extraction main line (6) before and after coal mine gas pump (8) passes through, back tee ball valve (10,7) a bypass pipe road (9) in parallel, in extraction main line (6) connection that preceding tee ball valve (10) is anterior the high pressure tank (13) of breather cheek valve (14) is housed, and connect a control of export ball valve (15) in the front portion of high pressure tank (13), the rear portion of high pressure tank (13) connects the tonifying Qi pipeline (12) by tonifying Qi control ball valve (11) control, on the extraction main line (6) after tonifying Qi pipeline (12) is connected between tee ball valve (7) and the gas pump (8);
B. the gas pumping pipe (5) in the mash gas pumping drilling (1) is connected with extraction main line (6) and carries out gas pumping;
C. control forward and backward tee ball valve (10,7), make that back tee ball valve path A and back tee ball valve path B are connected, preceding tee ball valve path A and preceding tee ball valve path B be connected, close tonifying Qi control ball valve (11) and control of export ball valve (15), at this moment, gas in the coal seam compiles through mash gas pumping drilling (1) and gas pumping pipe (5) and flows in the extraction main line (6), then successively in back tee ball valve (7), gas pump (8) and preceding tee ball valve (10) inflow high pressure tank (13);
When the gas pressure in the high pressure tank (13) is elevated to 0.3 MPa, open control of export ball valve (15), the gas in the high pressure tank (13) is outwards carried through extraction main line (6);
When the gas pressure of high pressure tank (13) is reduced to 0.1 MPa, close control of export ball valve (15);
D. behind gas pumping 5～10 min, before the control, back tee ball valve (10,7), back tee ball valve path A and back tee ball valve path C are connected, preceding tee ball valve path A and preceding tee ball valve path C are connected, open tonifying Qi control ball valve (11), close control of export ball valve (15), make the gas in the high pressure tank (13) enter extraction main line (6) through tonifying Qi pipeline (12), again through gas pump (8), preceding tee ball valve (10), bypass line (9), back tee ball valve (7), extraction main line (6) and gas pumping pipe (5) oppositely are pressed in the mash gas pumping drilling (1), and the time that is pressed into gas in the mash gas pumping drilling (1) is 3～5min;
When the gas pressure in the high pressure tank (13) during less than external air pressure, outside air enters in the high pressure tank (13) by breather cheek valve (14), to satisfy the tolerance that oppositely is pressed in the mash gas pumping drilling (1);
E. repeating step c, d alternately implement to bleed and calm the anger, and make alternately to occur extraction air-flow (2) in mash gas pumping drilling (1) and the gas pumping pipe (5) and be pressed into air-flow (3), are reduced to below 16% until the gas density of extraction, stop to take out pressure.
2. a kind of taking out according to claim 1 pressed gas pumping method alternately, and it is characterized in that: the described pressure that is pressed into air-flow (3) is 0.03MPa～0.2 MPa.
3. realize that taking out of the described method of claim 1 press gas pumping equipment alternately for one kind, comprise gas pumping pipe (5), the extraction main line (6) that links to each other with gas pumping pipe (5), be located at the gas pump (8) on the extraction main line (6), it is characterized in that: before the front and back extraction main line (6) of described gas pump (8) is provided with, back tee ball valve (10,7), before the warp, back tee ball valve (10,7) be connected with the bypass line (9) that is in parallel with gas pump (8), be connected with high pressure tank (13) on the extraction main line (6) of preceding tee ball valve (10) front portion, high pressure tank (13) front portion is installed on control of export ball valve (15), the rear portion of high pressure tank (13) is provided with and is connected the tonifying Qi pipeline (12) on the extraction main line (6) between back tee ball valve (7) and the gas pump (8), tonifying Qi pipeline (12) is provided with tonifying Qi control ball valve (11), and the bottom of high pressure tank (13) is provided with breather cheek valve (14).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110317591 CN102352768B (en) | 2011-10-19 | 2011-10-19 | Gas drainage method and equipment with alternative drainage |
| PCT/CN2012/080499 WO2013056597A1 (en) | 2011-10-19 | 2012-08-23 | Gas extraction method and device with alternating extraction and injection |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110317591 CN102352768B (en) | 2011-10-19 | 2011-10-19 | Gas drainage method and equipment with alternative drainage |
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| Publication Number | Publication Date |
|---|---|
| CN102352768A CN102352768A (en) | 2012-02-15 |
| CN102352768B true CN102352768B (en) | 2013-09-11 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201110317591 Active CN102352768B (en) | 2011-10-19 | 2011-10-19 | Gas drainage method and equipment with alternative drainage |
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| CN (1) | CN102352768B (en) |
| WO (1) | WO2013056597A1 (en) |
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| CN116122891B (en) * | 2023-03-01 | 2024-06-25 | 中国矿业大学(北京) | Device and method for improving extraction effect through secondary intelligent hole sealing of gas extraction drilling |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US5417286A (en) * | 1993-12-29 | 1995-05-23 | Amoco Corporation | Method for enhancing the recovery of methane from a solid carbonaceous subterranean formation |
| US5769165A (en) * | 1996-01-31 | 1998-06-23 | Vastar Resources Inc. | Method for increasing methane recovery from a subterranean coal formation by injection of tail gas from a hydrocarbon synthesis process |
| US5944104A (en) * | 1996-01-31 | 1999-08-31 | Vastar Resources, Inc. | Chemically induced stimulation of subterranean carbonaceous formations with gaseous oxidants |
| CN101012755A (en) * | 2007-02-11 | 2007-08-08 | 杜志刚 | Equipment for increasing gas exhaustion of coal mine bed by hole drilling |
| CN101012756A (en) * | 2007-02-11 | 2007-08-08 | 杜志刚 | Method for increasing gas exhaustion of coal mine bed by hole drilling |
| CN101122222A (en) * | 2007-09-19 | 2008-02-13 | 中国科学院武汉岩土力学研究所 | Down-hole horizontal hole exploitation system for mixing gas displacing coal gas, and the method |
| CN101280688B (en) * | 2008-05-27 | 2011-05-04 | 河南理工大学 | Reagional eliminating method for drilling along the top at prominent coal heading face |
| CN101705836B (en) * | 2009-09-30 | 2011-08-10 | 中国矿业大学 | Jet control device and method |
| RU2419723C1 (en) * | 2010-02-02 | 2011-05-27 | Александр Васильевич Булкин | Degasation method of developed coal beds |
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| CN102352768A (en) | 2012-02-15 |
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