CN104963660A - Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method - Google Patents
Liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method Download PDFInfo
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- CN104963660A CN104963660A CN201510418456.4A CN201510418456A CN104963660A CN 104963660 A CN104963660 A CN 104963660A CN 201510418456 A CN201510418456 A CN 201510418456A CN 104963660 A CN104963660 A CN 104963660A
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Abstract
The invention discloses a liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method. The liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method comprises the steps that a pumping mining drill hole is drilled; a monitoring drill hole is drilled; a pumping mining pipeline is arranged; an injecting pipeline is arranged; a temperature monitoring device is installed; coal-bed gas pumping mining operation is started; liquid nitrogen injecting operation is started; the liquid nitrogen injecting operation is repeated; the pumping mining operation is started and other steps. The liquid nitrogen freeze-thawing cracking coal-bed permeability-increasing coal-bed gas mining method completely adapt to coal-bed physical and mechanical properties under a deep mining condition, the permeability of a coal bed can be effectively improved, and then the yield of the coal-bed gas is obviously improved.
Description
Technical field
The present invention relates to a kind of coal bed methane exploring method, the coal bed methane exploring method that especially a kind of frozen-thawed cracking coal seam is anti-reflection.
Background technology
The feature (hyposmosis, low saturation, low pressure and high air content) that China's coal seam reservoirs has " three low one is high ", cause coal-bed gas exploitation input cost high, and output capacity is low, coalbed gas in coal mine area develops difficulty.At present, coal mining enterprise is anti-reflection mainly through coal seam, namely strengthens the method for coal seam permeability to improve methane output, and coal seam anti-reflection method mainly comprises that waterpowerization is anti-reflection, the anti-reflection extraction technology etc. of high energy gas fracturing and directional long borehole.The advantages such as technical matters that waterpowerization is anti-reflection operation is simple and easy, technical costs is cheap, but usually need the on-the-spot condition with protection coal petrography post, easily bringing out spray orifice causes tunnel gas exceeding limit, affects construction operation safety.Technical matters that high energy gas fracturing is anti-reflection is complicated, technical costs is high, drug delivery during hypotonic broken soft seam construction operation, lower pipe difficulty are large, and due to the anisotropy of coal body and powder charge quantitative limitation, cause that explosion scope is little, Crack Extension directionality is poor, meanwhile, due to the existence of methane in coal seam, add in blasting process and bring out gas explosion and outstanding danger in hole.Directional long borehole technology has the advantage of the large and directional drilling of drilling construction length, but extracting result is difficult to play its advantage in hypotonic broken soft seam.Along with cbm development enters deep mining, reservoir is heavily stressed, the characteristic of hyposmosis is further remarkable, and existing coal seam anti-reflection method cannot meet the requirement of coal bed gas extraction.
In sum, prior art cannot adapt to the coal seam characteristic under deep mining completely, lacks the coal bed methane exploring method effectively improving coal bed gas product rate.
Summary of the invention
The invention provides the coal bed methane exploring method that a kind of frozen-thawed cracking coal seam is anti-reflection, adapt to the coal seam characteristic under Mining in Deep-lying Conditions completely, can effectively improve coal bed gas product rate.
The technical solution used in the present invention is as follows:
The coal bed methane exploring method that frozen-thawed cracking coal seam is anti-reflection, comprises the following steps:
A) in underworkings, get out extraction borehole to coal-bed gas exploitation coal seam, and go out some groovings in described extraction borehole internal cutting;
B) in described coal-bed gas exploitation coal seam, get out to monitor with the position of described extraction borehole distance 2-6m and hole;
C) arrange extraction pipeline, stretch in described extraction borehole by described extraction pipeline one end, the other end is communicated with extraction equipment, and described extraction pipeline installs extraction stop valve;
D) arrange injection pipeline, stretch in described extraction borehole by described injection pipeline one end, the other end is communicated with note liquid nitrogen pump, and described injection pipeline is installed fluid injection nitrogen stop valve;
E) extraction borehole sealing device is used to seal described extraction borehole;
F) in described monitoring boring, device for detecting temperature is installed, and the temperature value after stable is defined as initial value T
0, use monitoring borehole sealing device to carry out sealing described monitoring boring;
G) determining that described fluid injection nitrogen stop valve is closed, when described extraction stop valve is opened, starting extraction equipment and start coal bed gas extraction operation;
H) monitor coal bed gas extraction instantaneous flow be reduced to initial extraction value 30%-50% or lower than 30ml/min time, close described extraction stop valve and described extraction equipment, stop extraction operation;
I) open described fluid injection nitrogen stop valve, start described note liquid nitrogen pump, start to carry out the operation of fluid injection nitrogen to described extraction borehole, liquid nitrogen injection rate is 20-40ml/min;
J) the temperature T monitored when described device for detecting temperature is reduced to initial value T
010% within time, close described note liquid nitrogen pump and described fluid injection nitrogen stop valve;
K) the temperature T monitored when described device for detecting temperature (11) rises to initial value T
0time neighbouring, repeat step I) and j), refer near so-called initial value | T-T
0|/T
0< 5%;
L) step k is repeated) 3-5 time, complete the operation of fluid injection nitrogen;
M) step g is repeated)-l);
N) step m is repeated) 2-3 time.
The coal bed methane exploring method that above-mentioned frozen-thawed cracking coal seam is anti-reflection, in steps d) after, in step I) before, also comprise steps d 1): water injecting pump is connected with described injection pipeline, and water filling stop valve is installed on connecting line, determine that described water filling stop valve is in closed condition; In steps d 1) after, in step I) before, also comprise step I 1): open described water filling stop valve, start described water injecting pump, carry out water injection work, waterflood injection rate is 40-100I/min, after water filling 3-5h, close described water injecting pump and described water filling stop valve, complete water injection work.
In the coal bed methane exploring method that above-mentioned frozen-thawed cracking coal seam is anti-reflection, be also connected with pulse water flooding controller between described water injecting pump and described water filling stop valve, for the formation of pulsed current, and adjust water injection pressure, make water injection pressure remain on 2-5MPa.
In the coal bed methane exploring method that above-mentioned frozen-thawed cracking coal seam is anti-reflection, described extraction borehole length is 15-80m, and diameter is 70-100mm.
In the coal bed methane exploring method that above-mentioned frozen-thawed cracking coal seam is anti-reflection, described cutting groove depth is 30-50cm, width is 5-10cm, and the distance of adjacent two described groovings is 1.5-2.5m, and grooving face and the coal seam biggest principal stress direction angle of described grooving (3) are greater than 87 °.
Technique scheme of the present invention has the following advantages compared to existing technology:
1. the coal bed methane exploring method that frozen-thawed cracking coal seam provided by the invention is anti-reflection, in freeze thawing boring, frozen-thawed cracking operation is implemented owing to adopting, the thermal field changing original coal body makes coal body pore water expand and move,, freeze thawing cracking scope radius can reach more than 5m, therefore, the present invention effectively can destroy Coal Pore Structure, promote the growth in coal body bedding and crack, change the physical and mechanical property of coal body and the distribution of stress of coal seam field, coal seam permeability obtains and obviously improves.
2. the coal bed methane exploring method that frozen-thawed cracking coal seam provided by the invention is anti-reflection, due to before enforcement fluid injection nitrogen, first implement water injection work, and apply pulse formula water flooding regime, increase effectively coal body wetted perimeter and moisture content, and then expand frozen-thawed cracking scope and coal body cracking effect, freeze thawing cracking scope radius can reach more than 8m, therefore, the present invention can make hypotonic coal seam permeability be improved greatly, can effectively improve synergy operating efficiency simultaneously.
3. the coal bed methane exploring method that frozen-thawed cracking coal seam provided by the invention is anti-reflection, owing to forming some groovings in extraction borehole, match with water injection work and the operation of fluid injection nitrogen, make flood effectiveness and fluid injection nitrogen effect more obvious, therefore, the present invention more effectively can improve coal seam permeability, and then significantly improves coal bed gas product rate.
4. the coal bed methane exploring method that frozen-thawed cracking coal seam provided by the invention is anti-reflection, due to for water injection time, the parameter such as water injection pressure and waterflood injection rate, the fluid injection nitrogen frequency, the parameters such as fluid injection nitrogen speed are optimized, therefore, it is more obvious that the present invention can improve coal seam permeability effect, and coal bed gas product rate significantly improves.
5. the coal bed methane exploring method that frozen-thawed cracking coal seam provided by the invention is anti-reflection, owing to forming multiple grooving in coal seam, for the coal seam after water filling provides enough expansion damages and the free space of rheodestruction in the distortion of note frozen-thawed, the deflection of boring surrounding medium reaches about 20%, coal body internal crack germinates, expansion, distressed zone increases fast, the coal bed gas desorption quantity of coal body significantly promotes, the significantly circulation of simultaneous temperature field raises and reduces, reduce the coal bed gas absorption property of coal body, therefore, the present invention can improve the desorption quantity of coal body permeability and coal bed gas to a greater extent, coal bed gas burst size significantly improves, coal bed gas product rate can improve 20%-40%.
Accompanying drawing explanation
In order to make content of the present invention be more likely to be clearly understood, below according to a particular embodiment of the invention and by reference to the accompanying drawings, the present invention is further detailed explanation, wherein
Fig. 1 is that the anti-reflection coal bed methane exploring method in frozen-thawed cracking coal seam of the present invention implements arrangement diagram.
Be labeled as in figure: 1-coal-bed gas exploitation coal seam, 2-extraction borehole, 3-grooving, 4-monitors boring, 5-extraction pipeline, 6-extraction stop valve, 7-injects pipeline, and 8-notes liquid nitrogen pump, 9-fluid injection nitrogen stop valve, 10-extraction borehole sealing device, 11-device for detecting temperature, 12-monitors borehole sealing device, 13-water injecting pump, 14-water filling stop valve, 15-pulse water flooding controller.
Detailed description of the invention
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Fig. 1 display be the preferred embodiment of the anti-reflection coal bed methane exploring method in frozen-thawed cracking coal seam of the present invention.
Embodiment one
The coal bed methane exploring method that described frozen-thawed cracking coal seam is anti-reflection, is characterized in that: comprise the following steps:
A) in underworkings, get out extraction borehole 2 to coal-bed gas exploitation coal seam 1, and go out some groovings 3 in described extraction borehole 2 internal cutting;
B) in described coal-bed gas exploitation coal seam 1, to get out apart from the position of 4m with described extraction borehole 2 and monitor boring 4;
C) arrange extraction pipeline 5, stretched in described extraction borehole 2 described extraction pipeline 5 one end, the other end is communicated with extraction equipment, and described extraction pipeline 5 installs extraction stop valve 6;
D) arrange injection pipeline 7, stretch in described extraction borehole 2 by described injection pipeline 7 one end, the other end is communicated with note liquid nitrogen pump 8, and described injection pipeline 7 is installed fluid injection nitrogen stop valve 9;
E) extraction borehole sealing device 10 is used to seal described extraction borehole 2;
F) in described monitoring boring 4, device for detecting temperature 11 is installed, and the temperature value after stable is defined as initial value T
0, use monitoring borehole sealing device 12 to carry out sealing described monitoring boring 4;
G) determining that described fluid injection nitrogen stop valve 9 is closed, when described extraction stop valve 6 is opened, starting extraction equipment and start coal bed gas extraction operation;
H) monitor coal bed gas extraction instantaneous flow be reduced to initial extraction value 35% or lower than 20ml/min time, close described extraction stop valve 6 and described extraction equipment, stop extraction operation;
I) open described fluid injection nitrogen stop valve 9, start described note liquid nitrogen pump 8, start to carry out the operation of fluid injection nitrogen to described extraction borehole 2, liquid nitrogen injection rate is 35ml/min;
J) the temperature T monitored when described device for detecting temperature 11 is reduced to initial value T
08% time, close described note liquid nitrogen pump 8 and described fluid injection nitrogen stop valve 9;
K) the temperature T monitored when described device for detecting temperature 11 rises to initial value T
0time neighbouring, repeat step I) and j);
L) step k is repeated) 3-5 time, complete the operation of fluid injection nitrogen;
M) step g is repeated)-l);
N) step m is repeated) 2-3 time.
In the present embodiment, described extraction borehole 2 length is 40m, and diameter is 75mm.
In the present embodiment, described grooving 3 degree of depth is 40cm, and width is 8cm, and the distance of adjacent two described groovings 3 is 2m, and the grooving face of grooving 3 and the angle of coal seam biggest principal stress direction are 90 °.
Embodiment two
Compared with embodiment one, the present embodiment is in steps d) after, in step I) before, also comprise steps d 1): water injecting pump 13 is connected with described injection pipeline 7, and water filling stop valve 14 is installed on connecting line, determine that described water filling stop valve 14 is in closed condition; In steps d 1) after, in step I) before, also comprise step I 1): open described water filling stop valve 14, start described water injecting pump 13, carry out water injection work, waterflood injection rate is 80I/min, after water filling 3h, close described water injecting pump 13 and described water filling stop valve 14, complete water injection work.
In the present embodiment, be also connected with pulse water flooding controller 15 between described water injecting pump 13 and described water filling stop valve 14, for the formation of pulsed current, and adjust water injection pressure, make water injection pressure remain on 4MPa.
The present embodiment is except above feature is different from embodiment one, and other are all identical.
Embodiment three
Compared with embodiment two, the present embodiment is except following difference, and other are all identical:
In the present embodiment, described extraction borehole 2 length is 50m, and diameter is 95mm.
In the present embodiment, described grooving 3 degree of depth is 45cm, and the distance of adjacent two described groovings 3 is 1.8m, and the grooving face of grooving 3 and the angle of coal seam biggest principal stress direction are 90 °.
Obviously, above-described embodiment is only for clearly example being described, and the restriction not to embodiment.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all embodiments.And thus the apparent change of extending out or variation be still among protection scope of the present invention.
Claims (5)
1. the coal bed methane exploring method that frozen-thawed cracking coal seam is anti-reflection, is characterized in that: comprise the following steps:
A) in underworkings, get out extraction borehole (2) to coal-bed gas exploitation coal seam (1), and go out some groovings (3) in described extraction borehole (2) internal cutting;
B) in described coal-bed gas exploitation coal seam (1), get out with the position of described extraction borehole (2) distance 2-6m and monitor hole (4);
C) extraction pipeline (5) is arranged, described extraction pipeline (5) one end is stretched in described extraction borehole (2), the other end is communicated with extraction equipment, described extraction pipeline (5) upper installation extraction stop valve (6);
D) injection pipeline (7) is arranged, described injection pipeline (7) one end is stretched in described extraction borehole (2), the other end is communicated with note liquid nitrogen pump (8), described injection pipeline (7) upper installation fluid injection nitrogen stop valve (9);
E) extraction borehole sealing device (10) is used to seal described extraction borehole (2);
F) in described monitoring boring (4), device for detecting temperature (11) is installed, and the temperature value after stable is defined as initial value T
0, use monitoring borehole sealing device (12) to carry out sealing described monitoring boring (4);
G) determining that described fluid injection nitrogen stop valve (9) is closed, when described extraction stop valve (6) is opened, starting extraction equipment and start coal bed gas extraction operation;
H) monitor coal bed gas extraction instantaneous flow be reduced to initial extraction value 30%-50% or lower than 30ml/min time, close described extraction stop valve (6) and described extraction equipment, stop extraction operation;
I) open described fluid injection nitrogen stop valve (9), start described note liquid nitrogen pump (8), start to carry out the operation of fluid injection nitrogen to described extraction borehole (2), liquid nitrogen injection rate is 20-40ml/min;
J) the temperature T monitored when described device for detecting temperature (11) is reduced to initial value T
010% within time, close described note liquid nitrogen pump (8) and described fluid injection nitrogen stop valve (9);
K) the temperature T monitored when described device for detecting temperature (11) rises to initial value T
0time neighbouring, repeat step I) and j);
L) step k is repeated) 3-5 time, complete the operation of fluid injection nitrogen;
M) step g is repeated)-l);
N) step m is repeated) 2-3 time.
2. the coal bed methane exploring method that frozen-thawed cracking coal seam according to claim 1 is anti-reflection, it is characterized in that: in steps d) after, in step I) before, also comprise steps d 1): water injecting pump (13) is connected with described injection pipeline (7), and water filling stop valve (14) is installed on connecting line, determine that described water filling stop valve (14) is in closed condition;
In steps d 1) after, in step I) before, also comprise step I 1): open described water filling stop valve (14), start described water injecting pump (13), carry out water injection work, waterflood injection rate is 40-100l/min, after water filling 3-5h, close described water injecting pump (13) and described water filling stop valve (14), complete water injection work.
3. the coal bed methane exploring method that frozen-thawed cracking coal seam according to claim 2 is anti-reflection, it is characterized in that: between described water injecting pump (13) and described water filling stop valve (14), be also connected with pulse water flooding controller (15), for the formation of pulsed current, and adjust water injection pressure, make water injection pressure remain on 2-5MPa.
4., according to the coal bed methane exploring method that the arbitrary described frozen-thawed cracking coal seam of claim 1-3 is anti-reflection, it is characterized in that: described extraction borehole (2) length is 15-80m, diameter is 70-100mm.
5. according to the coal bed methane exploring method that the arbitrary described frozen-thawed cracking coal seam of claim 1-4 is anti-reflection, it is characterized in that: described grooving (3) degree of depth is 30-50cm, width is 5-10cm, the distance of adjacent two described groovings (3) is 1.5-2.5m, and grooving face and the coal seam biggest principal stress direction angle of described grooving (3) are greater than 87 °.
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| CN106869891A (en) * | 2017-03-09 | 2017-06-20 | 杨世梁 | A kind of coal bed methane exploring method and device of ice-cleat pressure regulation |
| CN107271473A (en) * | 2017-08-22 | 2017-10-20 | 中国科学院寒区旱区环境与工程研究所 | The indoor simulated system that frozen-thaw process influences on soil environment |
| CN107489445A (en) * | 2017-09-30 | 2017-12-19 | 杨世梁 | A kind of ice-cleat pressure regulation coal mine gas underground pumping method and device |
| CN108194125A (en) * | 2017-12-18 | 2018-06-22 | 中国矿业大学 | A kind of coal seam cooperates with anti-reflection method step by step |
| CN109869125A (en) * | 2019-04-17 | 2019-06-11 | 四川省科建煤炭产业技术研究院有限公司 | A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection |
| CN109915199A (en) * | 2019-05-05 | 2019-06-21 | 河南理工大学 | Gas drainage device and its application method are strengthened in anti-reflection coal seam step by step |
| CN114575813A (en) * | 2022-03-05 | 2022-06-03 | 中国矿业大学 | Liquid nitrogen fracturing device, construction method and fracturing system with fracturing device |
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| CN105822341A (en) * | 2016-06-12 | 2016-08-03 | 河南理工大学 | Low permeability coal bed supercritical carbon dioxide anti-reflection system and method |
| CN106337672B (en) * | 2016-10-25 | 2018-11-16 | 中国矿业大学 | A kind of method of the anti-reflection coal body extraction coal bed gas of cycle pulse formula low temperature freeze thawing |
| CN106337672A (en) * | 2016-10-25 | 2017-01-18 | 中国矿业大学 | Method for extracting coal bed gas from circulating pulse type low temperature freeze-thawed anti-reflection coal |
| CN106869891A (en) * | 2017-03-09 | 2017-06-20 | 杨世梁 | A kind of coal bed methane exploring method and device of ice-cleat pressure regulation |
| CN106869891B (en) * | 2017-03-09 | 2019-03-15 | 杨世梁 | A kind of coal bed methane exploring method and device of ice-cleat pressure regulation |
| CN107271473A (en) * | 2017-08-22 | 2017-10-20 | 中国科学院寒区旱区环境与工程研究所 | The indoor simulated system that frozen-thaw process influences on soil environment |
| CN107271473B (en) * | 2017-08-22 | 2023-06-30 | 中国科学院西北生态环境资源研究院 | Indoor simulation system for influence of freeze thawing process on soil environment |
| CN107489445A (en) * | 2017-09-30 | 2017-12-19 | 杨世梁 | A kind of ice-cleat pressure regulation coal mine gas underground pumping method and device |
| CN108194125A (en) * | 2017-12-18 | 2018-06-22 | 中国矿业大学 | A kind of coal seam cooperates with anti-reflection method step by step |
| CN109869125A (en) * | 2019-04-17 | 2019-06-11 | 四川省科建煤炭产业技术研究院有限公司 | A kind of method that liquid nitrogen is used for coal bed gas extraction with hydraulic pressure presplitting compound anti-reflection |
| CN109915199A (en) * | 2019-05-05 | 2019-06-21 | 河南理工大学 | Gas drainage device and its application method are strengthened in anti-reflection coal seam step by step |
| CN109915199B (en) * | 2019-05-05 | 2024-05-07 | 河南理工大学 | Progressive permeability-increasing coal seam reinforced gas extraction device and use method thereof |
| CN114575813A (en) * | 2022-03-05 | 2022-06-03 | 中国矿业大学 | Liquid nitrogen fracturing device, construction method and fracturing system with fracturing device |
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