CN107476794A - A kind of method that high temperature nitrogen increase coal body gas permeability is noted after liquid nitrogen gasification circulation - Google Patents
A kind of method that high temperature nitrogen increase coal body gas permeability is noted after liquid nitrogen gasification circulation Download PDFInfo
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- CN107476794A CN107476794A CN201710896755.8A CN201710896755A CN107476794A CN 107476794 A CN107476794 A CN 107476794A CN 201710896755 A CN201710896755 A CN 201710896755A CN 107476794 A CN107476794 A CN 107476794A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 513
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 255
- 239000007788 liquid Substances 0.000 title claims abstract description 125
- 239000007789 gas Substances 0.000 title claims abstract description 81
- 239000003245 coal Substances 0.000 title claims abstract description 75
- 230000035699 permeability Effects 0.000 title claims abstract description 26
- 238000002309 gasification Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000005553 drilling Methods 0.000 claims abstract description 46
- 238000005086 pumping Methods 0.000 claims abstract description 45
- 230000001174 ascending effect Effects 0.000 claims abstract description 27
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 12
- 239000007924 injection Substances 0.000 claims abstract description 12
- 230000003313 weakening effect Effects 0.000 claims abstract description 11
- 230000008014 freezing Effects 0.000 claims abstract description 8
- 238000007710 freezing Methods 0.000 claims abstract description 8
- 238000010992 reflux Methods 0.000 claims description 50
- 238000007789 sealing Methods 0.000 claims description 37
- 238000010276 construction Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 230000006872 improvement Effects 0.000 claims description 3
- 229910001873 dinitrogen Inorganic materials 0.000 claims description 2
- 238000010257 thawing Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 8
- 238000000605 extraction Methods 0.000 description 7
- 230000008878 coupling Effects 0.000 description 4
- 238000010168 coupling process Methods 0.000 description 4
- 238000005859 coupling reaction Methods 0.000 description 4
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 230000003667 anti-reflective effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000005415 magnetization Effects 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000005325 percolation Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/25—Methods for stimulating production
- E21B43/26—Methods for stimulating production by forming crevices or fractures
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/006—Production of coal-bed methane
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- Engineering & Computer Science (AREA)
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- Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical & Material Sciences (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
A kind of method that high temperature nitrogen increase coal body gas permeability is noted after being circulated the invention discloses liquid nitrogen gasification, mash gas pumping drilling of being constructed in roadway workface；Magnetized water is injected into mash gas pumping drilling by magnetized water ascending pipe, then magnetized water seepage flow into the coal body around mash gas pumping drilling；Liquid nitrogen in liquid nitrogen container fills liquid nitrogen into mash gas pumping drilling；The magnetized water that liquid nitrogen freezing is penetrated into coal body, and gasify and be changed into nitrogen, make pressure rise in mash gas pumping drilling；The nitrogen to have gasified in mash gas pumping drilling, which enters in nitrogen heating tank, to be collected；Above-mentioned freeze thawing step is repeated, implementing multiple liquid nitrogen gasification to mash gas pumping drilling circulates；Nitrogen heating tank heats to the nitrogen of its internal gathering, makes in high temperature nitrogen injection mash gas pumping drilling, high temperature nitrogen is carried out fracturing to coal body.The present invention first makes coal body produce weakening region, then coal body rupture anti-reflection, so as to shorten the thermal storage time of nitrogen, while is improving the anti-reflection scope to coal body.
Description
Technical field
The present invention relates to a kind of method for increasing coal body gas permeability using nitrogen, noted after specifically a kind of liquid nitrogen gasification circulation
The method that high temperature nitrogen increases coal body gas permeability.
Background technology
The construction in China coal seam is complicated, and permeability is generally relatively low, and many high methane coal bodies belong to low-permeable coal body.Together
When increase with the progressively increasing of coal mining depth, stress, reduce further the gas permeability of coal body.In poor air permeability
Mine carries out non-release coal gas and takes out that effect is often all undesirable, and increase coal body gas permeability is particularly important in advance.At present, I
Waterpower measure mainly is used during state's increase coal body gas permeability, as hydraulic fracturing, waterpower are cut.Arranged using waterpowerization is anti-reflection
Shi Shi, coal body easy argillization after being immersed in water, so as to the Gas Flow passage that results in blockage, and it is limited by the surface tension of water
It is anti-reflection to be limited in scope；In addition in the anti-reflection measure of progress waterpowerization, the requirement of coal body initial cracking pressure is at least 25MPa, therefore in height
Coal and gas prominent is easily induced under pressure water effect, is efficiently produced to colliery and brings serious potential safety hazard.
The Chinese patent of Application No. 201210056438.2 discloses a kind of nitrogen noted under temperature and pressure coupling
The method of gas anti-reflection mash gas extraction, this method act on anti-reflection hole implantation temperature and coupling pressure lower nitrogen, by temperature with
The coupling of the lower nitrogen of coupling pressure effect, anti-reflection to coal body progress, concrete principle is that nitrogen presses off the small yardstick crack of coal body,
Further expand original closure crack expansion crack in coal body, anti-reflection rear gas can pass through crack passage and discharge coal body, the party
Although method will not block Gas Flow passage, during coal body gas permeability is increased, when nitrogen needs the accumulation of heat grown very much
Between after can just cause coal fracturing and anti-reflection, in addition its there is also gas injection time is long, anti-reflection the problem of being limited in scope.
The content of the invention
In view of the above-mentioned problems of the prior art, the present invention notes high temperature nitrogen increase after providing a kind of liquid nitrogen gasification circulation
The method of coal body gas permeability, coal body is produced weakening region, then coal body rupture it is anti-reflection, so as to not only greatly shorten
The thermal storage time of nitrogen simultaneously reduces gas injection time, while effectively improves the anti-reflection scope to coal body.
To achieve these goals, the technical solution adopted by the present invention is：High temperature nitrogen is noted after a kind of liquid nitrogen gasification circulation
Increase the method for coal body gas permeability, the nitrogen permeability improvement device of use includes liquid nitrogen container, amount of liquid nitrogen visualizer, the conveying of the first liquid nitrogen absolutely
Heat pipe, the first nitrogen reflux pipe, liquid nitrogen surge tank, the second liquid nitrogen conveying heat-insulated pipe, the second control valve, sealing of hole pipe connection,
Nitrogen heater, the 3rd control valve, the second nitrogen reflux pipe, high temperature nitrogen ascending pipe, the 4th control valve, triple valve, backflow
Mouth connecting tube, magnetized water ascending pipe and the 5th control valve, amount of liquid nitrogen visualizer are fixed on liquid nitrogen container, and the outlet of liquid nitrogen container passes through
First liquid nitrogen conveys the inlet communication of heat-insulated pipe and liquid nitrogen surge tank, and the refluxing opening of liquid nitrogen surge tank passes through the first nitrogen reflux pipe
Connected with the refluxing opening of liquid nitrogen surge tank, the outlet of liquid nitrogen surge tank conveys heat-insulated pipe and hole sealing tube connection dress by the second liquid nitrogen
Put the import with hole sealing tube to be connected, the hole sealing tube is fixed in mash gas pumping drilling by sealing of hole sections, on the tube wall of hole sealing tube
Nitrogen reflux mouth and magnetized water inlet are offered, magnetized water inlet connects with one end of magnetized water ascending pipe, nitrogen reflux
Mouth is connected by refluxing opening connecting tube with the one of port of triple valve, and two other port of triple valve passes through the second nitrogen respectively
Return duct and high temperature nitrogen ascending pipe and the refluxing opening of nitrogen heating tank and the outlet of nitrogen heating tank；First liquid nitrogen conveys
Heat-insulated pipe is provided with the first control valve, and the second liquid nitrogen conveying heat-insulated pipe is provided with the second control valve, the second nitrogen reflux Guan Shangshe
There is the 3rd control valve, high temperature nitrogen ascending pipe is provided with the 4th control valve, and magnetized water filling line is provided with the 5th control valve；Its
Concretely comprising the following steps during work：
A, according to the mash gas pumping drilling that coal body tendency construction is downward in roadway workface；
B, mash gas pumping drilling is sealed using High-Pressure Grouting Method and hole sealing tube is set, the hole sealing tube is that liquid nitrogen is defeated
Send dedicated pipe；
C, the 5th control valve is opened, magnetized water is injected into mash gas pumping drilling by magnetized water ascending pipe and hole sealing tube,
The injection pressure of magnetized water is 2~4MPa, and the duration is 1~2h, and then magnetized water is to the coal body around mash gas pumping drilling
Interior seepage flow；
D, the 5th control valve is closed, 6~8h is stood, then opens the first control valve and the second control valve, in liquid nitrogen container
Liquid nitrogen conveys heat-insulated pipe, liquid nitrogen surge tank, the second liquid nitrogen through the first liquid nitrogen and conveys heat-insulated pipe, sealing of hole pipe connection and hole sealing tube
Liquid nitrogen is injected into mash gas pumping drilling, until filling；
E, the first control valve and the second control valve are closed, stands 2~3h, makes to form relative closure in mash gas pumping drilling
Space, the magnetized water that liquid nitrogen freezing is penetrated into coal body, and a part of liquid nitrogen is changed into nitrogen through gasification, makes mash gas pumping drilling
Interior pressure rise；
F, the 3rd control valve is opened, the nitrogen for making to have gasified in mash gas pumping drilling connects through nitrogen reflux mouth, refluxing opening
Pipe, triple valve and the second nitrogen reflux pipe enter in nitrogen heating tank, until after the liquid nitrogen in mash gas pumping drilling is gasified totally
Close the 3rd control valve；
G, repeat step D~F, multiple liquid nitrogen gasification is implemented to mash gas pumping drilling and circulated, so that coal body forms reduction
Area；
H, nitrogen heating tank heats to the nitrogen of its internal gathering, the heating-up temperature of nitrogen is reached 60~100 DEG C
High temperature nitrogen, then open the 4th control valve, make high temperature nitrogen through high temperature nitrogen ascending pipe, triple valve and hole sealing tube injection watt
In this extraction borehole, the weakening region that high temperature nitrogen is formed to coal body is carried out fracturing, be finally reached the gas permeability of increase coal body.
Further, the liquid nitrogen gasification cycle-index of the step G is 4~8 times.
Further, the first liquid nitrogen conveying heat-insulated pipe is provided with the first non-return valve, and it is inverse that the first nitrogen reflux pipe is provided with second
Only valve, the second nitrogen reflux pipe are provided with the 3rd non-return valve, and high temperature nitrogen ascending pipe is provided with the 4th non-return valve.
Compared with prior art, the present invention is finally noted using first injecting magnetized water and then carrying out multiple liquid nitrogen gasification circulation
Enter high temperature nitrogen and fracturing is carried out to coal body；Because the scope that the more conventional water of magnetized water spreads in coal is big, therefore inject magnetized water
Make the water absorption rate of coal body high, the freezing range for being subsequently implanted into liquid nitrogen is greatly improved, and after coal body is due to water suction glaciation,
Make its expansion rate bigger, be favorably improved coal body freeze thawing fracturing effect；Coal seam arrangement under to mash gas pumping drilling, liquid nitrogen lean on from
Body gravity is flowed into drilling, it is ensured that and liquid nitrogen can fill up whole mash gas pumping drilling, and as the gasification of liquid nitrogen, nitrogen are taken out to gas
It is mobile outside borehole, it is easy to the collection of nitrogen.Then due to magnetized water heat release Cheng Bing, now liquid nitrogen endothermic gasification is changed into nitrogen
Gas, make pressure rise in mash gas pumping drilling, accelerate seepage flow of the liquid nitrogen in coal body, increase the freezing range of coal body；In more not good liquors
Under nitrogen ringing, coal body macroscopic view crack is promoted to develop by the congelation of coal body and the expansion of magnetization water freezing
Link up and micro-pore opens development, so as to form coal body weakening region.Then high temperature nitrogen, fracturing pin are injected to coal body weakening region
Strong to property, coal body fracturing effect is good, and gas permeability increasing degree is big, can effectively improve coal bed gas extraction effect；High temperature nitrogen is also
Thermal source can be provided for gasresolution, accelerate the parsing speed of gas, be easy to gas high concentration, big flow extraction.The nitrogen of collection
It is changed into high temperature nitrogen through heating device, realizes recycling for liquid nitrogen, it is simple and convenient without being additionally provided source nitrogen again.Should
Method not only efficiently solves the problem that the anti-reflection scope of lower permeability seam is small, antireflective effect is poor, moreover it is possible to improves gas extraction concentration
And accelerate low-air-permeability coal-bed gas extraction speed, there is wide applicability.
Brief description of the drawings
Fig. 1 is the structural representation after present invention assembling.
In figure：1st, liquid nitrogen container；2nd, amount of liquid nitrogen visualizer；3rd, the first liquid nitrogen conveying heat-insulated pipe；4th, the first control valve；5th, first
Non-return valve；6th, the first nitrogen reflux pipe；7th, the second non-return valve；8th, liquid nitrogen surge tank；9th, the second liquid nitrogen conveying heat-insulated pipe；10th,
Two control valves；11st, sealing of hole pipe connection；12nd, nitrogen heating tank；13rd, the 3rd control valve；14th, the 3rd non-return valve；15th, second
Nitrogen reflux pipe；16th, high temperature nitrogen ascending pipe；17th, the 4th control valve；18th, the 4th non-return valve；19th, nitrogen reflux mouth；20th, three
Port valve；21st, refluxing opening attachment means；22nd, magnetized water ascending pipe；23rd, the 5th control valve；24th, hole sealing tube；25th, sealing of hole sections；26、
Mash gas pumping drilling；27th, coal body.
Embodiment
The invention will be further described below.
As shown in figure 1, the method for high temperature nitrogen increase coal body gas permeability, the nitrogen of use are noted after a kind of liquid nitrogen gasification circulation
Permeability improvement device includes liquid nitrogen container 1, amount of liquid nitrogen visualizer 2, the first liquid nitrogen conveying heat-insulated pipe 3, the first nitrogen reflux pipe 6, liquid nitrogen and delayed
Tank 8, the second liquid nitrogen conveying heat-insulated pipe 9, the second control valve 10, sealing of hole pipe connection 11, nitrogen heater the 12, the 3rd is rushed to control
Valve 13 processed, the second nitrogen reflux pipe 15, high temperature nitrogen ascending pipe 16, the 4th control valve 17, triple valve 20, refluxing opening connecting tube
21st, the control valve 23 of magnetized water ascending pipe 22 and the 5th, amount of liquid nitrogen visualizer 2 are fixed on liquid nitrogen container 1, and the outlet of liquid nitrogen container 1 leads to
The inlet communication of the first liquid nitrogen conveying heat-insulated pipe 3 and liquid nitrogen surge tank 8 is crossed, the refluxing opening of liquid nitrogen surge tank 8 passes through the first nitrogen
Return duct 6 connects with the refluxing opening of liquid nitrogen surge tank 8, and the outlet of liquid nitrogen surge tank 8 conveys heat-insulated pipe 9 and envelope by the second liquid nitrogen
Hole pipe connection 11 is connected with the import of hole sealing tube 24, and the hole sealing tube 24 is fixed on mash gas pumping drilling by sealing of hole sections 25
In 26, nitrogen reflux mouth 19 and magnetized water inlet are offered on the tube wall of hole sealing tube 24, magnetized water inlet is noted with magnetized water
Entering one end connection of pipe 22, nitrogen reflux mouth 19 is connected by refluxing opening connecting tube 21 with 20 one of port of triple valve, and three
Two other port of port valve 20 passes through the second nitrogen reflux pipe 15 and high temperature nitrogen ascending pipe 16 and nitrogen heating tank 12 respectively
The outlet of refluxing opening and nitrogen heating tank 12；First liquid nitrogen conveying heat-insulated pipe 3 is provided with the first control valve 4, the second liquid nitrogen
Conveying heat-insulated pipe 9 is provided with the second control valve 10, and the second nitrogen reflux pipe 15 is provided with the 3rd control valve 13, high temperature nitrogen injection
Pipe 16 is provided with the 4th control valve 17, and magnetized water ascending pipe 22 is provided with the 5th control valve 23；Concretely comprising the following steps during its work：
A, according to the mash gas pumping drilling 26 that coal body tendency construction is downward in roadway workface；
B, mash gas pumping drilling 26 is sealed using High-Pressure Grouting Method and hole sealing tube 24 is set, the hole sealing tube 24 is
Liquid nitrogen conveys dedicated pipe；
C, the 5th control valve 23 is opened, is injected by magnetized water ascending pipe 22 and hole sealing tube 24 into mash gas pumping drilling 26
Magnetized water, the injection pressure of magnetized water is 2~4MPa, and the duration is 1~2h, and then magnetized water was to mash gas pumping drilling 26 weeks
Seepage flow in the coal body enclosed；Percolation flow velocity of the magnetized water compared to conventional water in coal body 27 is fast, and penetration range is wide；
D, the 5th control valve 23 is closed, 6~8h is stood, then opens the first control valve 4 and the second control valve 10, liquid nitrogen container
Liquid nitrogen in 1 conveys heat-insulated pipe 3, liquid nitrogen surge tank 8, the second liquid nitrogen through the first liquid nitrogen and conveys heat-insulated pipe 9, sealing of hole pipe connection
11 and hole sealing tube 24 inject liquid nitrogen into mash gas pumping drilling 26, until fill；The nitrogen of gasification is through the in the liquid nitrogen surge tank 8
One nitrogen reflux pipe 6 and the second non-return valve 7 pass back into liquid nitrogen container 1, so as to balance the air pressure of liquid nitrogen container 1 and liquid nitrogen surge tank 8,
Be advantageous to accelerate liquid nitrogen injection rate；
E, the first control valve 4 and the second control valve 10 are closed, stands 2~3h, makes to be formed relatively in mash gas pumping drilling 26
The space of closing, the magnetized water that liquid nitrogen freezing is penetrated into coal body 27, and a part of liquid nitrogen is changed into nitrogen through gasification, makes gas
Pressure rise in extraction borehole 26；So as to accelerate seepage flow of the liquid nitrogen in coal body 27, and increase the freezing range of coal body 27；
F, the 3rd control valve 13 is opened, the nitrogen for making to have gasified in mash gas pumping drilling 26 is through nitrogen reflux mouth 19, backflow
Mouth connecting tube 21, the nitrogen reflux pipe 15 of triple valve 20 and second enter in nitrogen heating tank 12, until in mash gas pumping drilling 26
Liquid nitrogen be gasified totally after close the 3rd control valve 13；
G, repeat step D~F, multiple liquid nitrogen gasification circulation is implemented to mash gas pumping drilling 26, so that coal body 27 is formed
Weakening region；As liquid nitrogen is used up during being circulated, then liquid nitrogen is supplemented by way of changing liquid nitrogen container 1；
H, nitrogen heating tank 12 heats to the nitrogen of its internal gathering, the heating-up temperature of nitrogen is reached 60~100
DEG C high temperature nitrogen, then open the 4th control valve 17, make high temperature nitrogen through high temperature nitrogen ascending pipe 16, triple valve 20 and sealing of hole
Pipe 24 is injected in mash gas pumping drilling 26, the weakening region that high temperature nitrogen is formed to coal body 27 is carried out fracturing, is finally reached increase
The gas permeability of coal body 27.
Further, the liquid nitrogen gasification cycle-index of the step G is 4~8 times.Using the cycle-index of this scope, both
The excessive Frozen-thawed cycled time will not be increased, and coal body 27 produces preferable weakening region after can ensureing Frozen-thawed cycled, so as to just
Fracturing in subsequent high temperature nitrogen to weakening region, finally make the fracturing effect of coal body 27 good, the gas permeability increasing degree of coal body 27
Greatly.
Further, the first liquid nitrogen conveying heat-insulated pipe 3 is provided with the first non-return valve 5, and the first nitrogen reflux pipe 6 is provided with second
Non-return valve 7, the second nitrogen reflux pipe 15 are provided with the 3rd non-return valve 14, and high temperature nitrogen ascending pipe 16 is provided with the 4th non-return valve
18.Set multiple non-return valves to prevent the backflow of liquid nitrogen or nitrogen in above-mentioned pipeline, improve the injection effect of liquid nitrogen or nitrogen.
Claims (3)
1. the method for high temperature nitrogen increase coal body gas permeability is noted after a kind of liquid nitrogen gasification circulation, it is characterised in that the nitrogen of use
Permeability improvement device includes liquid nitrogen container (1), amount of liquid nitrogen visualizer (2), the first liquid nitrogen conveying heat-insulated pipe (3), the first nitrogen reflux pipe
(6), liquid nitrogen surge tank (8), the second liquid nitrogen conveying heat-insulated pipe (9), the second control valve (10), sealing of hole pipe connection (11), nitrogen
Gas heater (12), the 3rd control valve (13), the second nitrogen reflux pipe (15), high temperature nitrogen ascending pipe (16), the 4th control
Valve (17), triple valve (20), refluxing opening connecting tube (21), magnetized water ascending pipe (22) and the 5th control valve (23), amount of liquid nitrogen are seen
Survey instrument (2) to be fixed on liquid nitrogen container (1), the outlet of liquid nitrogen container (1) conveys heat-insulated pipe (3) and liquid nitrogen surge tank by the first liquid nitrogen
(8) inlet communication, the refluxing opening of liquid nitrogen surge tank (8) pass through the backflow of the first nitrogen reflux pipe (6) and liquid nitrogen surge tank (8)
Mouth connection, the outlet of liquid nitrogen surge tank (8) pass through the second liquid nitrogen and convey heat-insulated pipe (9) and sealing of hole pipe connection (11) and sealing of hole
The import connection of (24) is managed, the hole sealing tube (24) is fixed in mash gas pumping drilling (26) by sealing of hole sections (25), hole sealing tube
(24) nitrogen reflux mouth (19) and magnetized water inlet, magnetized water inlet and magnetized water ascending pipe (22) are offered on tube wall
One end connection, nitrogen reflux mouth (19) connected by refluxing opening connecting tube (21) with triple valve (20) one of port, three
Heated respectively by the second nitrogen reflux pipe (15) and high temperature nitrogen ascending pipe (16) with nitrogen port valve (20) two other port
The refluxing opening of tank (12) and the outlet of nitrogen heating tank (12)；First liquid nitrogen conveying heat-insulated pipe (3) is provided with the first control
Valve (4), the second liquid nitrogen conveying heat-insulated pipe (9) are provided with the second control valve (10), and the second nitrogen reflux pipe (15) is provided with the 3rd
Control valve (13), high temperature nitrogen ascending pipe (16) are provided with the 4th control valve (17), and magnetized water ascending pipe (22) is provided with the 5th
Control valve (23)；Concretely comprising the following steps during its work：
A, according to the mash gas pumping drilling (26) that coal body tendency construction is downward in roadway workface；
B, mash gas pumping drilling (26) is sealed using High-Pressure Grouting Method and hole sealing tube (24) is set；
C, the 5th control valve (23) is opened, by magnetized water ascending pipe (22) and hole sealing tube (24) into mash gas pumping drilling (26)
Magnetized water is injected, the injection pressure of magnetized water is 2~4MPa, and the duration is 1~2h, and then magnetized water is to mash gas pumping drilling
(26) seepage flow in the coal body around；
D, the 5th control valve (23) is closed, 6~8h is stood, then opens the first control valve (4) and the second control valve (10), liquid nitrogen
Liquid nitrogen in tank (1) conveys heat-insulated pipe (3), liquid nitrogen surge tank (8), the second liquid nitrogen through the first liquid nitrogen and conveys heat-insulated pipe (9), sealing of hole
Pipe connection (11) and hole sealing tube (24) the injection liquid nitrogen into mash gas pumping drilling (26), until filling；
E, the first control valve (4) and the second control valve (10) are closed, stands 2~3h, makes to form phase in mash gas pumping drilling (26)
The magnetized water penetrated into the space of closing, liquid nitrogen freezing in coal body (27), and a part of liquid nitrogen is changed into nitrogen through gasification, makes
Mash gas pumping drilling (26) interior pressure rise；
F, the 3rd control valve (13) is opened, makes the interior nitrogen to have gasified of mash gas pumping drilling (26) through nitrogen reflux mouth (19), return
Head piece connecting tube (21), triple valve (20) and the second nitrogen reflux pipe (15) enter in nitrogen heating tank (12), until gas is taken out
Liquid nitrogen in borehole (26) closes the 3rd control valve (13) after being gasified totally；
G, repeat step D~F, multiple liquid nitrogen gasification is implemented to mash gas pumping drilling (26) and circulated, so that coal body (27) is formed
Weakening region；
H, nitrogen heating tank (12) heats to the nitrogen of its internal gathering, the heating-up temperature of nitrogen is reached 60~100 DEG C
High temperature nitrogen, then open the 4th control valve (17), make high temperature nitrogen through high temperature nitrogen ascending pipe (16), triple valve (20) and
In hole sealing tube (24) injection mash gas pumping drilling (26), the weakening region that high temperature nitrogen is formed to coal body (27) is set to carry out fracturing, most
Reach the gas permeability of increase coal body (27) eventually.
2. noting the method for high temperature nitrogen increase coal body gas permeability after liquid nitrogen gasification circulation according to claim 1, its feature exists
In the liquid nitrogen gasification cycle-index of the step G is 4~8 times.
3. noting the method for high temperature nitrogen increase coal body gas permeability after liquid nitrogen gasification circulation according to claim 1, its feature exists
In the first liquid nitrogen conveying heat-insulated pipe (3) is provided with the first non-return valve (5), and the first nitrogen reflux pipe (6) is provided with the second non-return valve
(7), the second nitrogen reflux pipe (15) is provided with the 3rd non-return valve (14), and high temperature nitrogen ascending pipe (16) is provided with the 4th non-return valve
(18)。
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896755.8A CN107476794B (en) | 2017-09-28 | 2017-09-28 | Note high temperature nitrogen increases the method for coal body gas permeability after a kind of liquid nitrogen gasification circulation |
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|---|---|---|---|
| CN201710896755.8A CN107476794B (en) | 2017-09-28 | 2017-09-28 | Note high temperature nitrogen increases the method for coal body gas permeability after a kind of liquid nitrogen gasification circulation |
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| CN107476794B CN107476794B (en) | 2019-05-07 |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108590740A (en) * | 2018-04-25 | 2018-09-28 | 中国矿业大学(北京) | A kind of magnetized water changes the gas drainage method of gas adsorption structure |
| CN108756836A (en) * | 2018-05-29 | 2018-11-06 | 西安科技大学 | A kind of underground coal mine fluid injection nitrogen permeability-increasing gas pumping system |
| CN109779597A (en) * | 2019-03-06 | 2019-05-21 | 绍兴文理学院 | The method and system of rock blast hazard prevention and control is realized using liquid nitrogen reduction coal body |
| CN109854210A (en) * | 2019-03-05 | 2019-06-07 | 重庆大学 | Using the gas pumping method and extraction system of liquid nitrogen and steam fracturing coal seam |
| CN110984941A (en) * | 2019-11-08 | 2020-04-10 | 中国石油大学(华东) | Method for liquid carbon dioxide fracturing modification of natural gas hydrate reservoir |
| CN111119829A (en) * | 2019-12-20 | 2020-05-08 | 中国矿业大学 | Coal bed permeability increasing method utilizing liquid nitrogen cold impact and phase change gas circulation damage |
| CN112031858A (en) * | 2020-10-12 | 2020-12-04 | 黑龙江科技大学 | Synthesis device for forming gas hydrate in coal bed |
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| 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 |
| CN112412415A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Hydraulic punching, freezing fracturing and heat injection stimulation synergistic permeability-increasing pumping-promoting method |
| CN112412421A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Method for strengthening pumping promotion by heat injection of cross-layer drilling and hydraulic punching |
| 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 |
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Address after: 221018 Jiangsu Province, Xuzhou City Yunlong District No. 2 Lishui Road Patentee after: Xuzhou University of Technology Address before: 221000 Jiangsu province Xuzhou Quanshan District South 3rd Ring Rd No. 18 Xuzhou Institute of Technology University of science and Technology Park (Xuzhou City, 2.5 Industrial Park) Patentee before: Xuzhou University of Technology |
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Application publication date: 20171215 Assignee: Xuzhou Runyue Network Technology Co.,Ltd. Assignor: XUZHOU University OF TECHNOLOGY Contract record no.: X2023320000181 Denomination of invention: A method for increasing coal permeability by injecting high-temperature nitrogen gas after liquid nitrogen gasification cycle Granted publication date: 20190507 License type: Common License Record date: 20230731 |