CN107762473A - A kind of liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability - Google Patents
A kind of liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability Download PDFInfo
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- CN107762473A CN107762473A CN201710896255.4A CN201710896255A CN107762473A CN 107762473 A CN107762473 A CN 107762473A CN 201710896255 A CN201710896255 A CN 201710896255A CN 107762473 A CN107762473 A CN 107762473A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 532
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 265
- 239000007788 liquid Substances 0.000 title claims abstract description 126
- 239000003245 coal Substances 0.000 title claims abstract description 89
- 239000007789 gas Substances 0.000 title claims abstract description 79
- 230000035699 permeability Effects 0.000 title claims abstract description 26
- 238000000034 method Methods 0.000 title claims abstract description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 47
- 238000005553 drilling Methods 0.000 claims abstract description 44
- 238000005086 pumping Methods 0.000 claims abstract description 44
- 230000001174 ascending effect Effects 0.000 claims abstract description 28
- 230000000694 effects Effects 0.000 claims abstract description 21
- 230000008014 freezing Effects 0.000 claims abstract description 20
- 238000007710 freezing Methods 0.000 claims abstract description 20
- 238000010438 heat treatment Methods 0.000 claims abstract description 15
- 238000002347 injection Methods 0.000 claims abstract description 11
- 239000007924 injection Substances 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 7
- 238000010992 reflux Methods 0.000 claims description 51
- 238000007789 sealing Methods 0.000 claims description 37
- 238000002309 gasification Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 claims description 4
- 238000004891 communication Methods 0.000 claims description 3
- 230000008676 import Effects 0.000 claims description 3
- 239000000155 melt Substances 0.000 claims description 3
- 238000009738 saturating Methods 0.000 claims description 3
- 238000010257 thawing Methods 0.000 abstract 1
- 238000000605 extraction Methods 0.000 description 6
- 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
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 229910001873 dinitrogen Inorganic materials 0.000 description 1
- 235000013399 edible fruits Nutrition 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 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
- 239000000243 solution Substances 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- 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)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- Physics & Mathematics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention discloses a kind of liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability, 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；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 thawing fracturing to the coal body freezed；Finally repeat the step of above-mentioned coal body freezes to melt with coal body.The present invention first makes coal body freeze and then make to freeze coal body to contact to form altitude temperature difference effect with high temperature nitrogen, progress coal body fracturing process, can effectively improve 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, specifically a kind of liquid nitrogen freezes with high temperature nitrogen
Melt the method for circulation increase 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 provides a kind of liquid nitrogen and high temperature nitrogen Frozen-thawed cycled increase coal
The method of body gas permeability, coal body is freezed and then is made to freeze coal body to contact to form altitude temperature difference effect with high temperature nitrogen, carry out coal body
Fracturing process, so as to not only greatly shorten the thermal storage time of nitrogen and reduce gas injection time, while effectively improve the increasing to coal body
Saturating scope.
To achieve these goals, the technical solution adopted by the present invention is：A kind of liquid nitrogen increases with high temperature nitrogen Frozen-thawed cycled
The method of coal body gas permeability, the nitrogen permeability improvement device of use include liquid nitrogen container, amount of liquid nitrogen visualizer, the conveying thermal insulation of the first liquid nitrogen
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
Gas heater, the 3rd control valve, the second nitrogen reflux pipe, high temperature nitrogen ascending pipe, the 4th control valve, triple valve, refluxing opening
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
One liquid nitrogen conveys the inlet communication of heat-insulated pipe and liquid nitrogen surge tank, the refluxing opening of liquid nitrogen surge tank by the first nitrogen reflux pipe with
The refluxing opening connection of liquid nitrogen surge tank, the outlet of liquid nitrogen surge tank convey heat-insulated pipe and sealing of hole pipe connection by the second liquid nitrogen
It is connected with the import of hole sealing tube, the hole sealing tube is fixed in mash gas pumping drilling by sealing of hole sections, is opened on the tube wall of hole sealing tube
Provided with nitrogen reflux mouth and magnetized water inlet, magnetized water inlet connects with one end of magnetized water ascending pipe, nitrogen reflux mouth
Connected by refluxing opening connecting tube with the one of port of triple valve, two other port of triple valve is returned by the second nitrogen respectively
Flow tube and high temperature nitrogen ascending pipe and the refluxing opening of nitrogen heating tank and the outlet of nitrogen heating tank；The conveying of first liquid nitrogen is exhausted
Heat pipe is provided with the first control valve, and the second liquid nitrogen conveying heat-insulated pipe is provided with the second control valve, and the second nitrogen reflux pipe is provided with
3rd control valve, high temperature nitrogen ascending pipe are provided with the 4th control valve, and magnetized water filling line is provided with the 5th control valve；Its work
Concretely comprising the following steps when making：
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；
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；
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, 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 coal body after making high temperature nitrogen and freezing forms altitude temperature difference effect after contacting, and completes the fracturing mistake of a coal body
Journey；
H, repeat step D~G, multiple liquid nitrogen freezing is implemented to mash gas pumping drilling and melts the temperature difference to be formed with high temperature nitrogen
Effect, so as to complete multiple fracturing process to coal body, it is finally reached the gas permeability of increase coal body.
Further, the liquid nitrogen freezing of the step H and high temperature nitrogen thaw cycle number are 3~7 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, then the present invention carries out multiple liquid nitrogen freezing and high temperature nitrogen using magnetized water is first injected
Melt and fracturing is carried out to coal body using alternate stress caused by altitude temperature difference effect；The model spread due to the more conventional water of magnetized water in coal
Enclose greatly, therefore injecting magnetized water makes the water absorption rate of coal body high, and the freezing range for being subsequently implanted into liquid nitrogen, and coal body is greatly improved
After water suction glaciation, make its expansion rate bigger, be favorably improved the fracturing effect melted again after coal body freezes；Coal seam cloth
Put it is lower to mash gas pumping drilling, liquid nitrogen by self gravitation flow into drilling in, it is ensured that liquid nitrogen can fill up whole mash gas pumping drilling,
And as the gasification of liquid nitrogen, nitrogen move to outside mash gas pumping drilling, it is easy to the collection of nitrogen.Then due to magnetized water heat release into
Ice, now liquid nitrogen endothermic gasification be changed into nitrogen, 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；Then high temperature nitrogen is injected to the coal body after freezing, the maximum temperature difference that now coal body is subjected to is up to 250
More than DEG C, liquid nitrogen freezes to coal body, and high temperature nitrogen is melted for coal body provides thermal source, unit interval coal temperature amplitude of variation
Greatly, therefore in the presence of coal body is by altitude temperature difference effect, promotes the development of coal body macroscopic view crack to link up and open development with micro-pore,
And then the fracturing effect to coal body is improved, increase the gas permeability of coal body；Then liquid nitrogen freezing and high temperature nitrogen pair are repeatedly being implemented
After coal body melts, body is acted on by the multiple alternate stress of altitude temperature difference effect, and so as to which fracturing is with strong points, coal body fracturing effect is good,
Gas permeability increasing degree is big, can effectively improve coal bed gas extraction effect；Other high temperature nitrogen can also provide heat for gasresolution
Source, accelerate the parsing speed of gas, be easy to gas high concentration, big flow extraction.The nitrogen of collection is changed into high temperature through heating device
Nitrogen, recycling for liquid nitrogen is realized, it is simple and convenient without being additionally provided source nitrogen again.This method not only efficiently solves
The problem that lower permeability seam is anti-reflection, and scope is small, antireflective effect is poor, moreover it is possible to improve gas extraction concentration and accelerate low air permeability coal seam
Gas pumping 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, a kind of liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability, the nitrogen of use increase
Saturating 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 buffering
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 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,
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 passes through
One liquid nitrogen conveys the inlet communication of heat-insulated pipe 3 and liquid nitrogen surge tank 8, and the refluxing opening of liquid nitrogen surge tank 8 passes through the first nitrogen reflux
Pipe 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 hole sealing tube by the second liquid nitrogen
Attachment means 11 are connected with the import of hole sealing tube 24, and the hole sealing tube 24 is fixed on mash gas pumping drilling 26 by sealing of hole sections 25
It is interior, nitrogen reflux mouth 19 and magnetized water inlet are offered on the tube wall of hole sealing tube 24, magnetized water inlet injects with magnetized water
One end connection of pipe 22, nitrogen reflux mouth 19 are connected by refluxing opening connecting tube 21 with 20 one of port of triple valve, threeway
Two other port of valve 20 passes through time of the second nitrogen reflux pipe 15 and high temperature nitrogen ascending pipe 16 and nitrogen heating tank 12 respectively
The outlet of head piece and nitrogen heating tank 12；First liquid nitrogen conveying heat-insulated pipe 3 is provided with the first control valve 4, and the second liquid nitrogen is defeated
Heat-insulated pipe 9 is sent to be provided with the second control valve 10, 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, 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, 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, and the coal body 27 after making high temperature nitrogen and freezing forms altitude temperature difference effect after contacting, and completes one
The fracturing process of secondary coal body 27；
H, repeat step D~G, implement multiple liquid nitrogen freezing to mash gas pumping drilling 26 and melt the temperature to be formed with high temperature nitrogen
Poor effect, so as to complete multiple fracturing process to coal body 27, it is finally reached the gas permeability of increase coal body 27.As liquid nitrogen is being followed
Used up during ring, then supplement liquid nitrogen by way of changing liquid nitrogen container 1.
Further, the liquid nitrogen freezing of the step H and high temperature nitrogen thaw cycle number are 3~7 times.Using this scope
Cycle-index, will not both increase excessive liquid nitrogen freezing and high temperature nitrogen thaw cycle time, and can produce enough
Altitude temperature difference effect, so that coal body 27 is carried out fracturing by multiple alternate stress, finally make the fracturing effect of coal body 27 good, coal body 27
Gas permeability increasing degree it is big.
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 each pipeline, improve the injection effect of liquid nitrogen or nitrogen
Fruit.
Claims (3)
1. a kind of liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability, it is characterised in that the nitrogen of use increases
Saturating device include 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 add
Thermal (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), liquid nitrogen discharge observation
Instrument (2) is fixed on liquid nitrogen container (1), and 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；
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, 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 coal body after making high temperature nitrogen and freezing forms altitude temperature difference effect after contacting,
Complete the fracturing process of a coal body；
H, repeat step D~G, multiple liquid nitrogen freezing is implemented to mash gas pumping drilling (26) and melts the temperature difference to be formed with high temperature nitrogen
Effect, so as to complete multiple fracturing process to coal body, it is finally reached the gas permeability of increase coal body (27).
2. liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability according to claim 1, it is characterised in that
The liquid nitrogen freezing of the step H is 3~7 times with high temperature nitrogen thaw cycle number.
3. liquid nitrogen and the method for high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability according to claim 1, it is characterised in that
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 |
|---|---|---|---|
| CN201710896255.4A CN107762473B (en) | 2017-09-28 | 2017-09-28 | A kind of method of liquid nitrogen and high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710896255.4A CN107762473B (en) | 2017-09-28 | 2017-09-28 | A kind of method of liquid nitrogen and high temperature nitrogen Frozen-thawed cycled increase coal body gas permeability |
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| Publication Number | Publication Date |
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| CN107762473A true CN107762473A (en) | 2018-03-06 |
| CN107762473B CN107762473B (en) | 2019-07-02 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108915648A (en) * | 2018-06-29 | 2018-11-30 | 徐州工程学院 | A kind of encapsulating method suitable for high temperature nitrogen injection coal bed drilling |
| CN109578059A (en) * | 2019-01-18 | 2019-04-05 | 中国矿业大学 | A kind of down-hole coal bed gas pumping method and its liquid nitrogen flow bursting by freezing device used |
| CN109577939A (en) * | 2018-12-25 | 2019-04-05 | 徐州工程学院 | A kind of method that big temperature difference Frozen-thawed cycled strengthens shale gas exploitation |
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| CN109611069A (en) * | 2018-12-25 | 2019-04-12 | 徐州工程学院 | A kind of big temperature difference Frozen-thawed cycled system improving ground drilling gas pumping effect |
| CN109577939A (en) * | 2018-12-25 | 2019-04-05 | 徐州工程学院 | A kind of method that big temperature difference Frozen-thawed cycled strengthens shale gas exploitation |
| CN109779590A (en) * | 2018-12-25 | 2019-05-21 | 徐州工程学院 | A kind of big temperature difference Frozen-thawed cycled method for ground drilling volume increase |
| CN109577939B (en) * | 2018-12-25 | 2020-09-01 | 徐州工程学院 | Method for strengthening shale gas exploitation through large-temperature-difference freeze-thaw cycle |
| CN109578059B (en) * | 2019-01-18 | 2020-10-09 | 中国矿业大学 | Underground coal bed gas extraction method and liquid nitrogen flowing frost cracking device used by same |
| CN109578059A (en) * | 2019-01-18 | 2019-04-05 | 中国矿业大学 | A kind of down-hole coal bed gas pumping method and its liquid nitrogen flow bursting by freezing device used |
| CN109723488A (en) * | 2019-03-05 | 2019-05-07 | 重庆大学 | Utilize the gas pumping method and extraction system of phase-change material auxiliary liquid nitrogen fracturing |
| 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 |
| CN112412416A (en) * | 2020-11-05 | 2021-02-26 | 河南理工大学 | Freezing fracturing and heat injection stimulation combined fracturing coal body permeability increasing and pumping promoting method |
| 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 |
| CN113445980A (en) * | 2021-07-08 | 2021-09-28 | 徐州工程学院 | Method for enhancing anti-reflection effect of hydraulic fracturing of ground drilling |
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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: 20180306 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 through freeze-thaw cycles of liquid nitrogen and high-temperature nitrogen gas Granted publication date: 20190702 License type: Common License Record date: 20230731 |