CN109869125A - A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection - Google Patents
A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection Download PDFInfo
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- CN109869125A CN109869125A CN201910309425.3A CN201910309425A CN109869125A CN 109869125 A CN109869125 A CN 109869125A CN 201910309425 A CN201910309425 A CN 201910309425A CN 109869125 A CN109869125 A CN 109869125A
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Abstract
The present invention relates to gas drainage technical fields in coal seam, provide a kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection, including drilling, first time pressure break, draining, second of pressure break, third time pressure break and mash gas extraction.The present invention carries out first time pressure break, second of pressure break and third time pressure break to the extraction borehole in coal seam by using the method for compound anti-reflection respectively, realizes that the crack formed in extraction borehole constantly expands, and antireflective effect is good, is convenient for subsequent gas drainage operation.
Description
Technical field
The present invention relates to gas drainage technical fields in coal seam, specifically, being related to a kind of increasing for gas in coal seam
The method of saturating extraction, the enhanced gas extraction especially suitable for gas in high methane low-permeability coal seam.
Background technique
China's coal-mine is mostly high methane low-permeable mine, in process of coal mining, Gas Outburst and gas explosion thing
Therefore happen occasionally, cause the consequences such as serious personal injury and property loss.Therefore, with social progress and to energy demand
Increase, how effectively to solve the problems, such as the gas drainage of low air permeability coal seam, to Safety of Coal Mine Production have highly important meaning
Justice.Domestic and international coal scientific research personnel conducts extensive research regarding to the issue above, creates multinomial anti-reflection technical measures, mainly
It is taken out in advance including deep hole standing shot and Deep-hole Controlled Blasting, hydraulic flushing in hole, hydraulic slotted liner technique, gaza's fracturing, liquid carbon dioxide phase
Become fracturing etc..These technologies have following defects that
One, the disadvantages of deep hole standing shot technology has the radius of influence small, and the duration is short.
Two, hydraulic flushing technology and hydraulic turbulence: using water as medium, a large amount of water resource is needed, and is generated a large amount of
The mixtures such as water, cinder, rock, influence the environment in tunnel, worker's working condition is severe.
Three, gaza's fracturing technology: Yi Shui, sand are medium, are haveed the shortcomings that same.
Four, Deephole pre-splitting blasting, liquid carbon dioxide phase transformation fracturing are also a kind of antireflective method of coal-bed gas, are existed now
It is more using also comparing in coal production, it is a kind of known technology, shortcoming is that the range of explosion is small, and only
It is that complete seam construction is made to go out some cracks, methane gas is allowed there are some channels, is flowed under the pressure of its own, in people
For extraction.
Meanwhile existing coal bed gas extraction technology is the quantity by increasing gas channel, its own is allowed to pass through diffusion
To achieve the purpose that mash gas extraction.
Summary of the invention
For deficiency above-mentioned in the prior art, the purpose of the present invention is to provide a kind of liquid nitrogen and hydraulic pressure presplitting are multiple
The anti-reflection method for coal bed gas extraction is closed, using this method, can be realized the crack in extraction borehole is ever-expanding
Purpose, antireflective effect is good, is convenient for subsequent gas drainage operation.
In order to achieve the above object, the solution that the present invention uses is:
A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection, comprising the following steps:
S1. it drills: drilling out extraction borehole in scheduled coal seam；
S2. first time pressure break: connection hydraulic fracturing pipeline conveys water into the extraction borehole using hydraulic fracturing pipeline
Make to form crack in the extraction borehole；
S3. drain: the water withdrawing the hydraulic fracturing pipeline and being discharged in the extraction borehole, the water in the crack are residual
It stays in the crack；
S4. second of pressure break: connection liquid nitrogen transfer pipeline, it is defeated into the extraction borehole using the liquid nitrogen transfer pipeline
Liquor charging nitrogen makes the water-setting in the crack build-up ice, volume expansion 10% when being build-up ice by water-setting, makes the cranny development shape
The crack of Cheng Xin；
S5. third time pressure break: stop liquid nitrogen conveying when the state in the extraction borehole reaches balance, while withdrawing institute
Liquid nitrogen transfer pipeline is stated, the temperature in the extraction borehole increases, and liquid nitrogen gasification is nitrogen, 600~700 times of volume expansion, is made
It obtains the new crack to develop again, ultimately forms gas channel；
S6. mash gas extraction: connection methane gas extraction pipeline utilizes the methane gas extraction pipeline mash gas extraction.
It further, further include the import for blocking the extraction borehole, specific steps in step S1 are as follows:
S11. it is inserted into injection hole sealing pipe in the entrance of the extraction borehole, injection slip casting envelope in Xiang Suoshu injection hole sealing pipe
Porous materials, and it is reserved for hydraulic fracturing pipeline, the channel that liquid nitrogen transfer pipeline and methane gas extraction pipeline pass through.
S12. the injection hole sealing pipe is withdrawn after the completion of the import of the extraction borehole blocks.
Further, the hydraulic fracturing pipeline includes clear water water-supply-pipe and mining fresh water pump, and the mining fresh water pump is used
It supplies water in into the extraction borehole.
Further, the liquid nitrogen transfer pipeline includes cryogenic liquid pump, liquid nitrogen tank car and liquid nitrogen delivery pipe, the low temperature
The input terminal of liquid pump is connect with liquid nitrogen tank car, and the output end of the cryogenic liquid pump is connect with liquid nitrogen delivery pipe.
Further, outlet pressure≤31.5Mpa of the mining fresh water pump, flow 500L/min.
Further, the outlet pressure of the cryogenic liquid pump is 5Mpa, flow 100-450L/h.
The beneficial effects of the present invention are:
The present invention carries out first time pressure break, to the extraction borehole in coal seam by using the method for compound anti-reflection respectively
Secondary fracturing and third time pressure break realize that the crack formed in extraction borehole constantly expands, and antireflective effect is good, is convenient for subsequent watt
This extraction operation.
Detailed description of the invention
The structural schematic diagram of hydraulic fracturing pipeline when Fig. 1 is first time pressure break of the invention；
The structural schematic diagram of liquid nitrogen transfer pipeline when Fig. 2 is second of pressure break of the invention；
The structural schematic diagram of extraction pipeline when Fig. 3 is mash gas extraction of the present invention；
In attached drawing: the coal seam 1-, 2- extraction borehole, 3- clear water delivery pipe, 4- is mining fresh water pump, 5- cryogenic liquid pump, 6- liquid
Nitrogen tank car, 7- liquid nitrogen delivery pipe, 8- injection hole sealing pipe, 9- injection hole sealing material, 10- methane gas extraction pipeline, the channel 11-, 12- valve
Door.
Specific embodiment
It in order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below will be in the embodiment of the present invention
Technical solution be clearly and completely described.The person that is not specified actual conditions in embodiment, according to normal conditions or manufacturer builds
The condition of view carries out.Reagents or instruments used without specified manufacturer is the conventional production that can be obtained by commercially available purchase
Product.
Below to a kind of liquid nitrogen provided in an embodiment of the present invention and hydraulic pressure presplitting compound anti-reflection for coal-bed gas pumping
The method adopted is specifically described.
A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection,
The following steps are included:
S1. it drills: referring to Fig.1, extraction borehole 2 being drilled out using conventional boring method first in scheduled coal seam 1,
The aperture of middle extraction borehole 2 and depth are determined according to the case where practical coal seam 1；
S2. first time pressure break: after being drilled extraction borehole 2, hydraulic fracturing pipeline is connected, wherein hydraulic fracturing pipeline includes
Clear water is conveyed the output end of 3 one end connecting mine fresh water pump 4 of clear water delivery pipe by clear water delivery pipe 3 and mining fresh water pump 4
3 other end of pipe is inserted into inside extraction borehole 2, and actual insertion depth is determined according to the actual depth of extraction borehole 2, then
The outlet pressure and flow of mining fresh water pump 4 are adjusted, wherein outlet pressure≤31.5Mpa, flow 500L/min, started mining
Fresh water pump 4 supplies water to clear water delivery pipe 3, water is conveyed into extraction borehole 2 using hydraulic fracturing pipeline, when in extraction borehole 2
Hydraulic pressure stops conveying when reaching balance, forms crack by first time hydraulic fracturing in extraction borehole 2 at this time；
S3. it drains: after forming crack in extraction borehole 2, withdrawing hydraulic fracturing pipeline and be discharged in extraction borehole 2
Water, during crack is formed, there is also there is water in crack, the water in crack for forming extraction borehole 2 in draining is residual
It stays in crack, prepares for pressure break next time.
S4. second of pressure break: after completing drainage works, liquid nitrogen transfer pipeline is connected, wherein liquid nitrogen transfer pipeline includes
The input terminal of cryogenic liquid pump 5, liquid nitrogen tank car 6 and liquid nitrogen delivery pipe 7, cryogenic liquid pump 5 is connect with liquid nitrogen tank car 6, Low Temperature Liquid
The output end of body pump 5 is connect with liquid nitrogen delivery pipe 7, and liquid nitrogen tank car 6 provides liquid nitrogen as nitrogen source, mobile flexibly easy to use, is adjusted
The outlet pressure and flow of cryogenic liquid pump 5 are saved, wherein outlet pressure is 5Mpa, flow is 100~450L/h, starts Low Temperature Liquid
Body pumps 5, and the liquid nitrogen in liquid nitrogen tank car 6 successively enters in extraction borehole 2 after cryogenic liquid pump 5 and liquid nitrogen delivery pipe 7, utilizes
Liquid nitrogen transfer pipeline conveys liquid nitrogen into extraction borehole, since temperature is -196 DEG C under liquid nitrogen normal pressure, in the pressure state of 5Mpa
In lower input extraction borehole 2, the water in crack that extraction borehole 2 is formed at this time is since acting under low-temperature condition for liquid nitrogen condenses
Cheng Bing, and the volume expansion 10% of water itself, so that the cranny development (expanding) in extraction borehole 2 forms new crack.
S5. third time pressure break: when the state in extraction borehole 2 reaches balance (i.e. conveying liquid nitrogen conveying do not enter for
Only), stop liquid nitrogen conveying, while withdrawing liquid nitrogen transfer pipeline, as the temperature in extraction borehole 2 increases, ice liquefaction is water, together
When liquid nitrogen undergo phase transition, by liquid nitrogen vaporization be nitrogen, liquid nitrogen in vaporescence own vol expand 600~700 times so that take out
Crack in borehole 2 develops (expand again) three times, ultimately forms gas channel.
S6. mash gas extraction: on the basis of forming gas channel, methane gas extraction pipeline 10 is connected, gas drainage pipe is utilized
Gas in 10 extraction coal seam 1 of road.
It wherein, further include the import for blocking extraction borehole 2, specific steps in step S1 are as follows:
S11. it can refer to Fig. 1, be inserted into injection hole sealing pipe 8 in the entrance of extraction borehole 2, injected into injection hole sealing pipe 8
Injection hole sealing material 9, and it is reserved for hydraulic fracturing pipeline, the channel 11 that liquid nitrogen transfer pipeline and methane gas extraction pipeline pass through,
Middle channel 11 is pipeline, and the end of pipeline is provided with valve 12, in practical operation, clear water delivery pipe 3 and liquid nitrogen delivery pipe 7
It is inserted into extraction borehole 2 by channel 11, and extraction pipeline 10 can be directly connected to channel 11, be convenient for mash gas extraction；It sets simultaneously
Setting valve 12 can prevent water and liquid nitrogen when conveying water and liquid nitrogen from flowing out from channel 11, improve the airtightness in channel 11.
S12. injection hole sealing pipe 8 is withdrawn after the completion of the import of extraction borehole 2 blocks.
To sum up, the present invention carries out the extraction borehole 2 in coal seam 1 for the first time respectively by using the method for compound anti-reflection
Pressure break, second of pressure break and third time pressure break realize that the crack formed in extraction borehole 2 constantly expands, and antireflective effect is good, is convenient for
Subsequent gas drainage operation.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.
Claims (6)
1. a kind of method that liquid nitrogen and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction, characterized in that including following
Step:
S1. it drills: drilling out extraction borehole in scheduled coal seam；
S2. first time pressure break: connection hydraulic fracturing pipeline, conveying water into the extraction borehole using hydraulic fracturing pipeline makes institute
It states and forms crack in extraction borehole；
S3. drain: the water withdrawing the hydraulic fracturing pipeline and being discharged in the extraction borehole, the water in the crack remain in
In the crack；
S4. second of pressure break: connection liquid nitrogen transfer pipeline conveys liquid into the extraction borehole using the liquid nitrogen transfer pipeline
Nitrogen makes the water-setting in the crack build-up ice, and volume expansion 10% when being build-up ice by water-setting forms the cranny development newly
Crack；
S5. third time pressure break: stop liquid nitrogen conveying when the state in the extraction borehole reaches balance, while withdrawing the liquid
Nitrogen transfer pipeline, the temperature in the extraction borehole increase, and liquid nitrogen gasification is nitrogen, and 600~700 times of volume expansion, so that institute
It states new crack to develop again, ultimately forms gas channel；
S6. mash gas extraction: connection methane gas extraction pipeline utilizes the methane gas extraction pipeline mash gas extraction.
2. the method that liquid nitrogen according to claim 1 and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction,
It is characterized in: further includes the import for blocking the extraction borehole, specific steps in the step S1 are as follows:
S11. it is inserted into injection hole sealing pipe in the entrance of the extraction borehole, injects injection hole sealing material in Xiang Suoshu injection hole sealing pipe
Material, and it is reserved for hydraulic fracturing pipeline, the channel that liquid nitrogen transfer pipeline and methane gas extraction pipeline pass through；
S12. the injection hole sealing pipe is withdrawn after the completion of the import of the extraction borehole blocks.
3. the method that liquid nitrogen according to claim 1 and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction,
Be characterized in: the hydraulic fracturing pipeline includes clear water water-supply-pipe and mining fresh water pump, and the mining fresh water pump is used for the pumping
It supplies water in borehole.
4. the method that liquid nitrogen according to claim 1 and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction,
Be characterized in: the liquid nitrogen transfer pipeline includes cryogenic liquid pump, liquid nitrogen tank car and liquid nitrogen delivery pipe, the cryogenic liquid pump it is defeated
Enter end to connect with liquid nitrogen tank car, the output end of the cryogenic liquid pump is connect with liquid nitrogen delivery pipe.
5. the method that liquid nitrogen according to claim 3 and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction,
It is characterized in: outlet pressure≤31.5Mpa of the mining fresh water pump, flow 500L/min.
6. the method that liquid nitrogen according to claim 4 and hydraulic pressure presplitting compound anti-reflection are used for coal bed gas extraction,
Be characterized in: the outlet pressure of the cryogenic liquid pump is 5Mpa, flow 100-450L/h.
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Cited By (10)
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| CN110924900A (en) * | 2019-12-04 | 2020-03-27 | 中国矿业大学 | Method for hydraulic power-liquid nitrogen composite uniform fracturing of coal body |
| CN111472685A (en) * | 2020-04-16 | 2020-07-31 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN111734376A (en) * | 2020-06-05 | 2020-10-02 | 西安科技大学 | Downhole high pressure liquid CO2Fracturing permeability-increasing coal rock complete equipment design method |
| CN112033811A (en) * | 2020-07-24 | 2020-12-04 | 中国矿业大学 | Simulation experiment system and method for cracking of upward drilling hole low-temperature fluid |
| CN112377162A (en) * | 2020-10-12 | 2021-02-19 | 重庆交通大学 | Method and spray head for crushing hot dry rock by liquid nitrogen cold impact composite high-pressure water jet |
| CN112412418A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Freezing fracturing synergistic hydraulic punching permeability-increasing pumping-promoting method for low-permeability coal seam |
| CN112523735A (en) * | 2020-12-08 | 2021-03-19 | 中国矿业大学 | Fracturing method for shale reservoir transformation |
| CN114412430A (en) * | 2022-01-24 | 2022-04-29 | 中国矿业大学 | Liquid carbon dioxide circulation fracturing coal bed gas reservoir permeability increasing device and method |
| CN114607337A (en) * | 2022-03-09 | 2022-06-10 | 中国石油大学(北京) | Liquid nitrogen-water composite fracturing method for coal-bed gas well |
| CN118030005A (en) * | 2024-04-11 | 2024-05-14 | 四川泓腾能源集团有限公司 | Liquid nitrogen fracturing device and use method |
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Cited By (15)
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| CN110924900A (en) * | 2019-12-04 | 2020-03-27 | 中国矿业大学 | Method for hydraulic power-liquid nitrogen composite uniform fracturing of coal body |
| CN111472685A (en) * | 2020-04-16 | 2020-07-31 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN111472685B (en) * | 2020-04-16 | 2021-10-01 | 四川省科建煤炭产业技术研究院有限公司 | Intermittent dynamic condensation deep hole drilling method |
| CN111734376A (en) * | 2020-06-05 | 2020-10-02 | 西安科技大学 | Downhole high pressure liquid CO2Fracturing permeability-increasing coal rock complete equipment design method |
| CN111734376B (en) * | 2020-06-05 | 2022-12-20 | 西安科技大学 | Downhole high pressure liquid CO 2 Method for designing complete equipment for fracturing permeability-increasing coal rock |
| CN112033811A (en) * | 2020-07-24 | 2020-12-04 | 中国矿业大学 | Simulation experiment system and method for cracking of upward drilling hole low-temperature fluid |
| CN112033811B (en) * | 2020-07-24 | 2021-08-24 | 中国矿业大学 | Simulation experiment system and method for cracking of upward drilling hole low-temperature fluid |
| CN112377162B (en) * | 2020-10-12 | 2022-10-28 | 重庆交通大学 | Method and spray head for crushing hot dry rock by liquid nitrogen cold impact composite high-pressure water jet |
| CN112377162A (en) * | 2020-10-12 | 2021-02-19 | 重庆交通大学 | Method and spray head for crushing hot dry rock by liquid nitrogen cold impact composite high-pressure water jet |
| CN112412418A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Freezing fracturing synergistic hydraulic punching permeability-increasing pumping-promoting method for low-permeability coal seam |
| CN112523735A (en) * | 2020-12-08 | 2021-03-19 | 中国矿业大学 | Fracturing method for shale reservoir transformation |
| CN114412430B (en) * | 2022-01-24 | 2022-09-27 | 中国矿业大学 | Liquid carbon dioxide circulation fracturing coal bed gas reservoir permeability increasing device and method |
| CN114412430A (en) * | 2022-01-24 | 2022-04-29 | 中国矿业大学 | Liquid carbon dioxide circulation fracturing coal bed gas reservoir permeability increasing device and method |
| CN114607337A (en) * | 2022-03-09 | 2022-06-10 | 中国石油大学(北京) | Liquid nitrogen-water composite fracturing method for coal-bed gas well |
| CN118030005A (en) * | 2024-04-11 | 2024-05-14 | 四川泓腾能源集团有限公司 | Liquid nitrogen fracturing device and use method |
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Application publication date: 20190611 |