CN109779590A - A large temperature difference freeze-thaw cycle method for surface drilling stimulation - Google Patents
A large temperature difference freeze-thaw cycle method for surface drilling stimulation Download PDFInfo
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- 238000005553 drilling Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 11
- 230000000638 stimulation Effects 0.000 title claims 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 400
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 197
- 239000007788 liquid Substances 0.000 claims abstract description 79
- 239000003245 coal Substances 0.000 claims abstract description 77
- 239000007789 gas Substances 0.000 claims abstract description 76
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 55
- 230000000694 effects Effects 0.000 claims abstract description 24
- 238000000605 extraction Methods 0.000 claims abstract description 22
- 230000035699 permeability Effects 0.000 claims abstract description 8
- 229910001873 dinitrogen Inorganic materials 0.000 claims abstract description 5
- 230000007774 longterm Effects 0.000 claims abstract 2
- 238000002347 injection Methods 0.000 claims description 11
- 239000007924 injection Substances 0.000 claims description 11
- 230000010349 pulsation Effects 0.000 claims description 11
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 claims description 4
- 239000013589 supplement Substances 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 2
- 238000005336 cracking Methods 0.000 claims 1
- 230000008014 freezing Effects 0.000 abstract description 8
- 238000007710 freezing Methods 0.000 abstract description 8
- 239000000155 melt Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 230000005415 magnetization Effects 0.000 description 19
- 230000036461 convulsion Effects 0.000 description 17
- 238000009530 blood pressure measurement Methods 0.000 description 7
- 230000008676 import Effects 0.000 description 7
- 238000002309 gasification Methods 0.000 description 4
- 238000010257 thawing Methods 0.000 description 4
- 238000011161 development Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007616 round robin method Methods 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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Abstract
本发明公开了一种用于地面钻井增产的大温差冻融循环方法，先向地面钻井的瓦斯抽采管内脉动注磁化水，其次高压氮气驱动磁化水进入煤体内，然后进行多次液氮冻结磁化水与高温氮气融化，利用磁化水的冻结膨胀力与液氮及高温氮气直接的大温差效应共同致裂煤体，通过高温高压氮气、液氮和磁化水相互作用，形成超大温差效应，对煤体进行致裂效果，最终能有效提高煤体的致裂效果及裂隙扩展范围，增大煤体渗透率，从而实现地面钻井对瓦斯大流量、高浓度、长时间的抽采。
The invention discloses a freeze-thaw cycle method with large temperature difference for surface drilling to increase production. First, magnetized water is pulsatingly injected into a gas extraction pipe of surface drilling, and then high-pressure nitrogen gas drives the magnetized water into the coal body, and then liquid nitrogen freezes for multiple times. The magnetized water melts with high-temperature nitrogen, and the coal is cracked by the freezing expansion force of the magnetized water and the direct large temperature difference effect of liquid nitrogen and high-temperature nitrogen. The fracturing effect of the coal body can finally effectively improve the fracturing effect of the coal body and the expansion range of the fissures, and increase the permeability of the coal body, so as to realize the large-flow, high-concentration and long-term gas drainage of the surface drilling.
Description
Technical field
The present invention relates to a kind of ground drilling method for increasing, specifically a kind of big temperature difference freeze thawing for ground drilling volume increase
Round-robin method.
Background technique
It is the main reason for limiting CMM Surface Well Drilling effect that China's coal seam permeability is generally lower.In order to improve coal
Layer permeability, generally using hydraulic fracturing technology carry out the anti-reflection processing in coal seam, but correlative study the result shows that: hydraulic fracture generate
Crack mainly along perpendicular to minimum principal stress Directional Extension, generated crack quantity is few, it is difficult to form longer crack, fail
Coal seam is stored and generates body breaking effect, while the disadvantage high there is also frac fluid pressure.The technology is in big portion, China at present
Divide the application effect in mining area also not satisfactory, relevant technical matters needs further to be studied.In addition application No. is
201410507011.9, the Chinese invention patent of entitled " a kind of hot and cold alternation system for improving coal bed gas extraction amount " proposes
The system that a kind of alternating infuses cold and hot raising drilling well for gas drainage yield, but the lowest temperature that the system is able to achieve is only -50
DEG C, the highest temperature is 200 DEG C, but in this temperature span range, crack propagation is limited in scope, and gas pumping effect is by about
Beam.It would therefore be highly desirable to develop new ground drilling gas method for increasing, the efficient draining coal seam gas of ground drilling in China is enriched
Technical system.
Summary of the invention
In view of the above existing problems in the prior art, the present invention provides a kind of big temperature difference freeze thawing for ground drilling volume increase
Round-robin method can effectively improve the fracturing effect and spreading range of coal body, increase coal body permeability, to realize ground drilling pair
Gas big flow, high concentration, prolonged extraction.
To achieve the goals above, the technical solution adopted by the present invention is that: it is a kind of for ground drilling volume increase the big temperature difference
Frozen-thawed cycled method, specific steps are as follows:
A, when in gas drainage pipe gas flow 8m is greatly reduced to3When, open the first valve and the second valve, starting
Magnetize water generator and jerk pump, magnetized water acts on obtaining surge magnetization water through pulsation pump surging, and surge magnetization water passes through third
Pipeline, the second pipeline and the first pipeline enter gas drainage pipe, and coal seam is cleaned and impacted to gas drainage pipe, splits coal body
Gap development, extension, the ripple frequency of control surge magnetization water are 0.05Hz~0.3Hz, and fluctuation pressure is 12MPa~18MPa, arteries and veins
The dynamic time is 30min~45min；
B, after to the injection of surge magnetization water, magnetization water generator, jerk pump, the first valve and the second valve are successively closed
Door；
C, the 5th valve, the 4th valve, third valve are opened, successively starts nitrogen supercharging device and nitrogen making machine, obtains height
Press nitrogen, the high pressure nitrogen pressure be 2.5MPa~5MPa, high pressure nitrogen through the 6th pipeline, the 5th pipeline, the 4th pipeline with
First pipeline enters gas drainage pipe, when gas pressure measurement device shows that the air pressure in gas drainage pipe is 4MPa, closes
Nitrogen making machine, nitrogen increase device, the 5th valve, the 4th valve and third valve；
D, it waits for a period of time, when gas pressure measurement device shows that the air pressure in gas drainage pipe is less than 3MPa, weight
Multiple step C, it is ensured that gas drainage overpressure maintains 3MPa~4MPa, enters high pressure nitrogen driving magnetized water in coal seam,
When the value for the distance magnetization water level that laser range finder measures is equal to gas drainage length of tube, nitrogen making machine is closed, nitrogen increases
Device, the 5th valve, the 4th valve and third valve stop the injection high pressure nitrogen in drilling well to the ground, then bore ground
Closed 12h~the 48h of well；
E, open the second liquid nitrogen valve and the first liquid nitrogen valve, starting liquid nitrogen jerk pump, liquid nitrogen through the low temperature resistant pipeline of third,
Second low temperature resistant pipeline and the first low temperature resistant pipeline enter gas drainage pipe, and contact with coal seam, have been injected into the magnetization in coal seam
Water is met liquid nitrogen and is freezed, and volume expansion makes the crack of coal body further expand, develop；
F, when the value apart from liquid nitrogen liquid level that laser range finder measures is that gas drainage length of tube subtracts 2 times of coal seam thicknesses
When, liquid nitrogen jerk pump, the second liquid nitrogen valve and the first liquid nitrogen valve are closed, pulsation injection liquid nitrogen in drilling well to the ground is stopped；
G, by the closed 8~16h of ground drilling, liquid nitrogen gasification generates nitrogen, pressure liter in ground drilling during this period of time
Height promotes liquid nitrogen in coal intrastratal flow, further freezes magnetized water, increase the fracturing effect of coal body；
H, after ground drilling is closed, the 8th valve, the 7th valve and third valve are opened, starts nitrogen temperature device
With nitrogen supercharging device, the nitrogen in gas drainage pipe is heated to be high temperature nitrogen after entering nitrogen temperature device from the 11st pipeline
Gas, high temperature nitrogen enters in nitrogen supercharging device by the 8th pipeline and the 12nd pipeline to be pressurized, by pressurized height
Warm high pressure nitrogen injects in ground drilling through the 4th pipeline and the first pipeline, shape after high temperature and pressure nitrogen is contacted with the coal body freezed
At super large altitude temperature difference effect, fracturing is carried out again to coal body；
I, the 5th valve and the 6th valve are opened, starts nitrogen making machine, nitrogen is by the 6th pipeline, the 7th pipeline and the 9th pipe
Road enters nitrogen temperature device, supplements the gas source of high temperature and pressure nitrogen；
J, the opening degree for adjusting the 8th valve is 30%~60%, guarantees the pressure accumulation environment in ground drilling, arranges simultaneously
The nitrogen that part has cooled down out；
K, when the temperature of temperature measuring device measurement is 160 DEG C, the 8th valve, the 7th valve, third valve, the are closed
Five valves, the 6th valve, nitrogen temperature device, nitrogen supercharging device and nitrogen making machine, ground drilling is closed for 24 hours afterwards to carry out gas
Extraction；
L, when the flow of gas drainage pipe is lower than 8m3When, step E~K is repeated, multiple liquid nitrogen freezing and height are carried out to coal seam
Warm high pressure nitrogen melts to form super large altitude temperature difference effect, eventually by the permeability for increasing coal body, it is ensured that the gas of ground drilling is big
Flow, high concentration, long-time extraction.
Further, the high temperature and pressure nitrogen temperature is 160~240 DEG C, and pressure is the nitrogen of 10~16MPa.
Further, the cycle-index for repeating step E~K is 8~12 times.
Compared with prior art, the present invention infuses magnetized water using the interior pulsation of gas drainage pipe of first drilling well to the ground, secondly
High pressure nitrogen driving magnetized water enters in coal body, then carries out multiple liquid nitrogen freezing magnetized water and high temperature nitrogen is melted, utilize magnetic
Change the freezing expansion power and the direct common fracturing coal body of big altitude temperature difference effect of liquid nitrogen and high temperature nitrogen of water.Pulsation injection magnetized water,
It can ensure that the unobstructed of gas drainage pipe, since the more conventional water of magnetized water range of scatter in coal seam is bigger, and surge magnetization water is made
Used in coal body can also fracturing coal body, increase the water absorption rate of coal body, increase substantially the freezing range of subsequent liquid nitrogen, coal body freezes
Cheng Binghou expansion rate is more preferable, helps to improve the freeze-thawing fracturing effect of coal body.After the injection of surge magnetization water, high pressure is injected
Nitrogen helps further to drive diffusion And Movement of the magnetized water in coal body, infiltrates coal body to the greatest extent.Pulsation injection liquid
Nitrogen, energy fracturing coal body, moreover it is possible to which the migration distance for increasing liquid nitrogen makes liquid nitrogen freezing more moisten coal body.With the gasification of liquid nitrogen,
Nitrogen pressure accumulation in ground drilling also contributes to driving liquid nitrogen in the intracorporal flowing of coal, further freezes magnetized water, increases coal body
Fracturing effect.The nitrogen of liquid nitrogen gasification is collected, and supplements source nitrogen with nitrogen making machine, by heating and pressurization, high temperature and pressure
Super large altitude temperature difference effect is formed between nitrogen and the coal body of liquid nitrogen freezing, coal body fracturing effect is good, and high temperature and high pressure gas also can be to coal
Body carries out fracturing.By controlling the opening degree of the 8th valve, the hyperbaric environment in ground drilling both ensure that, moreover it is possible to row in time
Except the nitrogen to have cooled down, it is ensured that the function and effect of the big temperature difference.Repeatedly implement the big temperature difference freeze thawing of liquid nitrogen and high temperature nitrogen to coal body
Circulation, coal body fracturing is with strong points, and coal body fracturing effect is good, and coal body permeability is significantly promoted.In addition, high temperature nitrogen can also be
Gasresolution provide heat source, accelerate the parsing rate of coal gas, convenient for the gas big flow of ground drilling, high concentration, it is long when
Between extraction.The problem of this method ground drilling gas extraction flow sharp fall has wide applicability.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Frozen-thawed cycled system in the present invention.
In figure: 1, coal seam；2, ground drilling；3, gas drainage pipe；4, the first pipeline；5, the first low temperature resistant pipeline；6, swash
Optar；7, drilling well sealing cover；8, the first three-way connection；9, the first valve；10, the second pipeline；11, jerk pump；12, third
Pipeline；13, the second valve；14, magnetize water generator；15, the 4th pipeline；16, third valve；17, nitrogen supercharging device；18,
Second three-way connection；19, the 5th pipeline；20, the 4th valve；21, third three-way connection；22, the 6th pipeline；23, the 5th valve；
24, nitrogen making machine；25, the 7th pipeline；26, the 6th valve；27, the first non-return valve；28, nitrogen temperature device；29, the 8th pipeline；
30, the 7th valve；31, the second non-return valve；32, the 9th pipeline；33, the 4th three-way connection；34, third non-return valve；35, the tenth pipe
Road；36, the 8th valve；37, the 11st pipeline；38, liquid nitrogen three-way connection；39, temperature measuring device；40, the second low temperature resistant pipe
Road；41, the first liquid nitrogen valve；42, gas pressure measurement device；43, liquid nitrogen jerk pump；44, the second liquid nitrogen valve；45, first
Liquid nitrogen non-return valve；46, the low temperature resistant pipeline of third；47, liquid nitrogen container；48, the 12nd pipeline.
Specific embodiment
The present invention will be further described below.
Specific steps of the invention are as follows:
A, when in gas drainage pipe gas flow 8m is greatly reduced to3When, the first valve 9 and the second valve 13 are opened,
Starting magnetization water generator 14 and jerk pump 11, magnetized water obtain surge magnetization water, surge magnetization through 11 panting action of jerk pump
Water enters gas drainage pipe 3 by third pipeline 12, the second pipeline 10 and the first pipeline 4, is cleaned simultaneously to gas drainage pipe 3
Coal seam 1 is impacted, coalmass crevasse development, extension are made, the ripple frequency of control surge magnetization water is 0.05Hz~0.3Hz, pulsating pressure
Power is 12MPa~18MPa, and pulse duration is 30min~45min；
B, after to the injection of surge magnetization water, successively close magnetization water generator 14, jerk pump 11, the first valve 9 with
Second valve 13；
C, the 5th valve 23, the 4th valve 20, third valve 16 are opened, nitrogen supercharging device 17 and nitrogen making machine are successively started
24, high pressure nitrogen is obtained, the high pressure nitrogen pressure is 2.5MPa~5MPa, and high pressure nitrogen is through the 6th pipeline 22, the 5th pipeline
19, the 4th pipeline 15 and the first pipeline 4 enter gas drainage pipe 3, when gas pressure measurement device 42 is shown in gas drainage pipe 3
Air pressure when being 4MPa, close nitrogen making machine 24, nitrogen increases device 17, the 5th valve 23, the 4th valve 20 and third valve 16；
D, it waits for a period of time, when gas pressure measurement device 42 shows that the air pressure in gas drainage pipe 3 is less than 3MPa,
Repeat step C, it is ensured that pressure maintains 3MPa~4MPa in gas drainage pipe 3, facilitates high pressure nitrogen driving magnetized water and enters
In coal seam, (illustrate that ground is bored when the value for the distance magnetization water level that laser range finder 6 measures is equal to gas drainage length of tube
Magnetized water in well 2 has penetrated into coal seam 1), close nitrogen making machine 24, nitrogen increases device 17, the 5th valve 23, the 4th valve
20 with third valve 16, and the injection high pressure nitrogen stopped in drilling well 2 to the ground makes then by the closed 12h~48h of ground drilling
Magnetized water moistens coal body to the greatest extent；
E, the second liquid nitrogen valve 44 and the first liquid nitrogen valve 41 are opened, liquid nitrogen jerk pump 43 is started, liquid nitrogen is resistance to low through third
Warm pipeline 46, the second low temperature resistant pipeline 40 and the first low temperature resistant pipeline 5 enter gas drainage pipe 3, and contact with coal seam 1, have infused
The magnetized water chance liquid nitrogen entered in coal seam 1 freezes, and volume expansion makes the crack of coal body further expand, develop；
F, when the value apart from liquid nitrogen liquid level that laser range finder 6 measures is that 3 length of gas drainage pipe subtracts 2 times of coal seams, 1 thickness
(coal seam thickness that the amount of liquid nitrogen injected in ground drilling is twice is determined) when spending, and closes liquid nitrogen jerk pump 43, the second liquid
Nitrogen valve 44 and the first liquid nitrogen valve 41 stop pulsation injection liquid nitrogen in drilling well 3 to the ground；
G, by the closed 8~16h of ground drilling, liquid nitrogen gasification generates nitrogen, pressure liter in ground drilling 3 during this period of time
Height further helps in liquid nitrogen in coal intrastratal flow, further freezes magnetized water, increases the fracturing effect of coal body；
H, after ground drilling 2 is closed, the 8th valve 36, the 7th valve 30 and third valve 16 is opened, nitrogen is started
Heat riser 28 and nitrogen supercharging device 17, the nitrogen in gas drainage pipe enter nitrogen temperature device 28 from the 11st pipeline 37
After be heated to be high temperature nitrogen, high temperature nitrogen enters in nitrogen supercharging device 17 by the 8th pipeline and the 12nd pipeline to be increased
Pressure is injected in ground drilling 2 by pressurized high temperature and pressure nitrogen through the 4th pipeline 15 and the first pipeline 4, high temperature and pressure nitrogen
Gas forms super large altitude temperature difference effect after contacting with the coal body freezed, further carries out fracturing, and high temperature and high pressure gas to coal body
Fracturing can be carried out to coal body；
I, the 5th valve 23 and the 6th valve 26 are opened, nitrogen making machine 24 is started, nitrogen passes through the 6th pipeline 22, the 7th pipeline
25 and the 9th pipeline 32 enter nitrogen temperature device 28, supplement high temperature and pressure nitrogen gas source；
J, the opening degree for adjusting the 8th valve 36 is 30%~60%, guarantees there is preferable pressure accumulation ring in ground drilling
Border, moreover it is possible to the nitrogen that discharge a part has cooled down in time；
K, when the temperature that temperature measuring device 39 measures is 160 DEG C, the 8th valve 36, the 7th valve 30, third are closed
Valve 16, the 5th valve 23, the 6th valve 26, nitrogen temperature device 28, nitrogen supercharging device 17 and nitrogen making machine 24, ground drilling
2 is closed for 24 hours afterwards to gas progress extraction；
L, when the flow of gas drainage pipe 3 is lower than 8m3When, repeat step E~K, to coal seam 1 carry out multiple liquid nitrogen freezing with
High temperature and pressure nitrogen melts to form super large altitude temperature difference effect, eventually by the permeability for increasing coal body, it is ensured that the gas of ground drilling
Big flow, high concentration, long-time extraction.
Further, the high temperature and pressure nitrogen temperature is 160~240 DEG C, and pressure is the nitrogen of 10~16MPa；It is described heavy
The cycle-index of multiple step E~K is 8~12 times.
As shown in Figure 1, the Frozen-thawed cycled system that the present invention uses includes the first pipeline 4, the first low temperature resistant pipeline 5, laser
Rangefinder 6, drilling well sealing cover 7, the first three-way connection 8, the second pipeline 10, jerk pump 11, third pipeline 12, magnetization water generator
14, the 4th pipeline 15, nitrogen supercharging device 17, the second three-way connection 18, the 5th pipeline 19, third three-way connection the 21, the 6th are managed
Road 22, nitrogen making machine 24, the 7th pipeline 25, nitrogen temperature device 28, the 8th pipeline 29, the 9th pipeline 32, the 4th three-way connection 33,
Tenth pipeline 35, the 11st pipeline 37, liquid nitrogen three-way connection 38, the second low temperature resistant pipeline 40, liquid nitrogen jerk pump 43, third are resistance to low
Warm pipeline 46 and liquid nitrogen container 47, magnetization water generator 14 are connected by third pipeline 12 with the import of jerk pump 11, jerk pump 11
Outlet be connected to one of port of the first three-way connection 8 by the second pipeline 10, the first three-way connection 8 other two
Port is connected to one end of one end of the 4th pipeline 15 and the first pipeline 4 respectively, the other end and nitrogen supercharging of the 4th pipeline 15
The outlet of device 17, the entrance of nitrogen supercharging device 17 pass through the 12nd pipeline 48 and the second three-way connection 18 wherein one
The connection of a port, other two port of the second three-way connection 18 respectively with one end of the 5th pipeline 19 and the 8th pipeline 29 one
End connection, the other end of the 8th pipeline 29 and the outlet of nitrogen temperature device 28, the other end and third of the 5th pipeline 19
One of port of three-way connection 21 is connected to, other two port of third three-way connection 21 respectively with the 6th pipeline 22 one
End is connected to one end of the 7th pipeline 25, the other end of the 6th pipeline 22 and the outlet of nitrogen making machine 24, the 7th pipeline 25
The other end is connected to the Single port therein of the 4th three-way connection 33, other two port of the 4th three-way connection 33 is respectively with the 9th
One end of pipeline 32 is connected to one end of the tenth pipeline 35, and the import of the other end and nitrogen temperature device 28 of the 9th pipeline 32 connects
Logical, the other end of the tenth pipeline 35 is connected to one of port of liquid nitrogen three-way connection 38, and liquid nitrogen three-way connection 38 is in addition
Two ports are connected to one end of one end of the first low temperature resistant pipeline 5 and the second low temperature resistant pipeline 40 respectively, the second low temperature resistant pipe
The outlet of the other end on road 40 and pulsation liquid nitrogen pump 43, the import of pulsation liquid nitrogen pump 43 by the low temperature resistant pipeline 46 of third with
Liquid nitrogen container 47 is connected to；Drilling well sealing cover 7, which seals, is fixed on the port of gas drainage pipe 3, the other end of the first pipeline 4 and first resistance to
The other end of cryogenic pipe 5 passes through drilling well sealing cover 7 and protrudes into gas drainage pipe 3, and it is close that the laser range finder 6 is fixed on drilling well
In capping 7；
Second pipeline 10 is equipped with the first valve 9, and third pipeline 12 is equipped with the second valve 13, on the 4th pipeline 15
Equipped with third valve 16, the 5th pipeline 19 is equipped with the 4th valve 20, and the 6th pipeline 22 is equipped with the 5th valve 23, the 7th pipeline
25 imports for being equipped with the 6th valve 26 and the first non-return valve 27 and the first non-return valve 27 are connected to third three-way connection 21, the
Eight pipelines 29 are equipped with the import of the 7th valve 30 and the second non-return valve 31 and the second non-return valve 31 and nitrogen temperature device 28 connects
Logical, the import that the tenth pipeline 35 is equipped with the 8th valve 36 and third non-return valve 34 and third non-return valve 34 is connected with liquid nitrogen three
First 38 connection, the second low temperature resistant pipeline 40 are equipped with the first liquid nitrogen valve 41, and the low temperature resistant pipeline 46 of third is equipped with the second liquid nitrogen
The import of valve 44 and liquid nitrogen non-return valve 45 and liquid nitrogen non-return valve 45 is connected to liquid nitrogen container 47.
Further, the first low temperature resistant pipeline 5 between the liquid nitrogen three-way connection 38 and drilling well sealing cover 7 is equipped with temperature
Measuring device 39.
Further, gas pressure measurement device 42 is installed on the drilling well sealing cover 7.
Above-mentioned laser range finder 6, jerk pump 11, magnetization water generator 14, nitrogen supercharging device 17, nitrogen making machine 24, nitrogen
Gas heat riser 28, temperature measuring device 39, liquid nitrogen jerk pump 43, liquid nitrogen container 47 and gas pressure measurement device 42 are existing
Equipment.
Claims (3)
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| 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 |
| CN115199243A (en) * | 2022-06-09 | 2022-10-18 | 中国石油大学(华东) | Tight oil reservoir is opened and is adopted aqueous vapor gas injection device in turn |
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| 张志强 等: ""低透性煤层气储层循环冻融增透技术研究"", 《煤炭技术》 * |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115199243A (en) * | 2022-06-09 | 2022-10-18 | 中国石油大学(华东) | Tight oil reservoir is opened and is adopted aqueous vapor gas injection device in turn |
| CN115199243B (en) * | 2022-06-09 | 2023-09-22 | 中国石油大学(华东) | Water-gas alternate gas injection device for dense oil reservoir exploitation |
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