CN110469313A - A kind of liquid nitrogen fracturing reform device and method for gas hydrates reservoir - Google Patents
A kind of liquid nitrogen fracturing reform device and method for gas hydrates reservoir Download PDFInfo
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- CN110469313A CN110469313A CN201910727734.2A CN201910727734A CN110469313A CN 110469313 A CN110469313 A CN 110469313A CN 201910727734 A CN201910727734 A CN 201910727734A CN 110469313 A CN110469313 A CN 110469313A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 196
- 239000007788 liquid Substances 0.000 title claims abstract description 100
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 98
- 239000007789 gas Substances 0.000 title claims abstract description 50
- 150000004677 hydrates Chemical class 0.000 title claims abstract description 46
- 238000000034 method Methods 0.000 title claims abstract description 35
- 230000008569 process Effects 0.000 claims abstract description 9
- 230000000977 initiatory effect Effects 0.000 claims abstract description 8
- 238000002347 injection Methods 0.000 claims abstract description 8
- 239000007924 injection Substances 0.000 claims abstract description 8
- 238000007710 freezing Methods 0.000 claims abstract description 5
- 230000008014 freezing Effects 0.000 claims abstract description 5
- 238000009413 insulation Methods 0.000 claims description 38
- 239000011435 rock Substances 0.000 claims description 20
- 230000015572 biosynthetic process Effects 0.000 claims description 10
- 239000004568 cement Substances 0.000 claims description 7
- 238000003825 pressing Methods 0.000 claims description 4
- 230000015556 catabolic process Effects 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- NMJORVOYSJLJGU-UHFFFAOYSA-N methane clathrate Chemical compound C.C.C.C.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O.O NMJORVOYSJLJGU-UHFFFAOYSA-N 0.000 claims description 2
- 238000007781 pre-processing Methods 0.000 claims description 2
- 230000035699 permeability Effects 0.000 abstract description 10
- 230000009466 transformation Effects 0.000 abstract description 6
- 239000012530 fluid Substances 0.000 abstract description 4
- 238000004891 communication Methods 0.000 abstract description 3
- 230000000704 physical effect Effects 0.000 abstract description 3
- 230000000694 effects Effects 0.000 description 10
- 206010017076 Fracture Diseases 0.000 description 7
- 238000001816 cooling Methods 0.000 description 7
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 206010010149 Complicated fracture Diseases 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005336 cracking Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 239000003345 natural gas Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000003112 inhibitor Substances 0.000 description 2
- 238000005065 mining Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 238000005979 thermal decomposition reaction Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000002178 crystalline material Substances 0.000 description 1
- 230000001351 cycling effect Effects 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011549 displacement method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 239000002803 fossil fuel Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000003252 repetitive effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- E21B43/01—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells specially adapted for obtaining from underwater installations
-
- 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
- E21B43/255—Methods for stimulating production including the injection of a gaseous medium as treatment fluid into the formation
-
- 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
- E21B43/267—Methods for stimulating production by forming crevices or fractures reinforcing fractures by propping
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The present invention relates to exploitation of gas hydrates technical fields, provide a kind of liquid nitrogen fracturing reform device and method for gas hydrates reservoir, method includes the following steps: 1) liquid nitrogen pre-processes；2) liquid nitrogen pressure break；3) liquid nitrogen freezing stratum；4) injection liquid nitrogen continues pressure break；Finally repeat step 3), 4) until the fracturing reform of the remaining gas hydrates reservoir of completion, reaches estimated pressure break scale.The present invention is compared with conventional hydraulic pressure break mode, using liquid nitrogen as fracturing fluid, pressure break is carried out to China's South China Sea gas hydrates reservoir using its special physical property, the problems such as reservoir is difficult to crack initiation caused by avoiding due to the features such as South China Sea gas hydrates reservoir diagenetic is poor, weak cementing, permeability is low, it can be improved in-place permeability after liquid nitrogen transformation pressure break, increase the communication capability on stratum and pit shaft, is provided safeguard for subsequent exploitation duration, high efficiency.
Description
Technical field
The present invention relates to exploitation of gas hydrates technical fields, and in particular to a kind of for gas hydrates reservoir
Liquid nitrogen fracturing reform device and method.
Background technique
Gas hydrates are commonly called as " combustible ice ", it is the class formed under the conditions of high pressure low temperature by natural gas and hydrone
The crystalline material of ice-like.Gas hydrates are mostly present in epeiric deep water sea area and high latitude permafrost band.Mesh
Before, the whole world has found gas hydrates in multiple exploration points.Gas hydrates have stock number is big, have a very wide distribution,
The features such as buried depth is shallow, cleanliness without any pollution.The natural gas resources contained in global gas hydrates have been converted to
Machine carbon content, magnitude are about twice of existing earth fossil fuel (petroleum, natural gas and coal) phosphorus content summation, are led in oil gas
Domain is considered as most having the new energy with development prospect.From the point of view of energy strategy, gas hydrates are opened
Hair is gradually paid attention to by many countries and regions.
China's South China Sea contains a large amount of gas hydrates, and the research of China's oil bound pair gas hydrates is also put on
Schedule.Studying the hydrate recovery method having proposed at present has decompression decomposition method, thermal decomposition method, injecting inhibitor method, CO2It sets
Change the unitized production method between method and these methods.When being depressured the throughput rate of gas hydrates in decomposition method, continuing
Between determined by the permeability on stratum；Since the fluid of direction of heat flow and output shares same seepage channel, energy in thermal decomposition method
Amount efficiency is lower；Injecting inhibitor method and CO2Displacement method is biggish since hydrate reservoir poor permeability does not provide for reaction
Contact area seriously constrains production efficiency.Need to propose new reservoir reconstruction method, the ditch on the stratum Lai Zengjia and pit shaft thus
Logical ability makes subsequent recovery method have sustainability and greatly improves single well productivity.
Hydraulic fracturing technology is used widely in fields such as low permeability reservoirs, shale gas exploitations, is one and is applied to oil
The important measures of oil/gas well stimulation.Fracturing technique is combined with exploitation of gas hydrates mode, it on the one hand can be in its pressure break
Fracture network is formed afterwards and increases in-place permeability, improves production efficiency；On the other hand, sand control can be played in nearly near wellbore
Effect solves the problems, such as occur sand plug in recovery process.But since China's South China Sea gas hydrates reservoir is mainly shale
Siltstone reservoir, have the characteristics that diagenesis it is poor, it is weak it is cementing, permeability is low.Traditional hydraulic fracturing is difficult to crack initiation in such reservoir,
Or crack rapid closing after crack initiation, expected fracturing effect is not achieved, therefore, it is necessary to one kind can satisfy China South China Sea day
The fracturing technique of right gas hydrate volume increase.
Summary of the invention
In view of the above-mentioned problems in the prior art, the present invention provides a kind of liquid nitrogen pressure breaks for gas hydrates reservoir to change
Device is made, additionally, it is provided a kind of liquid nitrogen fracturing reform method for gas hydrates reservoir.
The following technical solution is employed by the present invention:
A kind of liquid nitrogen fracturing reform device for gas hydrates reservoir, including pit shaft, pressure break pump group and pressure pass
Sensor, pit shaft reach the gas hydrates being located under reservoir overlying rock and reservoir rock stratum across reservoir overlying rock
Reservoir, pit shaft include insulation fracturing string, casing and cement sheath, and insulation fracturing string is arranged in casing, and cement sheath setting exists
Outside casing；Pressure break pump group is connected with one end of insulation fracturing string, and pressure sensor setting is on insulation fracturing string.
Further, the insulation fracturing string selects vacuum heat-insulation oil pipe.
In above-mentioned technical proposal, in order to reduce liquid nitrogen in pit shaft from well head into target reservoir flow process stratum and well
Heat exchange between cylinder.Insulation pressure break pipeline in the wellbore uses vacuum heat-insulation oil pipe, due to its good heat insulation,
The heat exchange of liquid nitrogen and external environment in pipeline is reduced, to ensure that liquid nitrogen reaches the temperature of target reservoir in effective range
It is interior, it is conducive to the cooling stratum of subsequent liquid nitrogen and fracturing stratum.
Wellbore pressure by well head pressure sensor real-time monitoring.
A kind of liquid nitrogen fracturing reform method for gas hydrates reservoir, comprising the following steps:
(1) liquid nitrogen pre-processes: injecting liquid nitrogen into insulation fracturing string, closes pit shaft after applying pressure to the liquid nitrogen of injection
Carry out stewing well or by insulation fracturing string circulating liquid nitrogen in pit shaft；
In above-mentioned technical proposal step (1), the main function of two kinds of preprocess methods is the liquid nitrogen and ground enable in stratum
Layer comes into full contact with cooling formation temperature, and frozen ground pore water is to increase the brittleness of gas hydrates reservoir, after being conducive to
Continuous fracturing work is gone on smoothly.
Liquid nitrogen is injected into insulation fracturing string, and is applied and is closed pit shaft after certain pressure and carry out stewing well；Or in pit shaft
Circulating liquid nitrogen.Liquid nitrogen temperature is -196 DEG C, is much smaller than formation temperature.Liquid nitrogen under the effect of the pressure with gas hydrates reservoir
Its cooling temperature is come into full contact with, makes that the formation rock pore water of nearly near wellbore freezes, rock matrix is by cold events, to increase
The brittleness of reservoir reduces the tensile strength and initial cracking pressure of reservoir rock, so that subsequent fracturing work is gone on smoothly；On the other hand
The rock acted on by liquid nitrogen cold shock will form a large amount of microcracks inside it, be conducive to during subsequent fracturing work major fracture with
Microcrack interaction, forms complicated fracture network.Wherein, insulation fracturing string is arranged in pit shaft.
(2) liquid nitrogen pressure break: taking step-by-step movement fracturing process, further injects into insulation fracturing string containing a certain concentration
The liquid nitrogen of proppant implements fracturing reform to crisp stratum is increased after pre-processing by liquid nitrogen；
In above-mentioned technical proposal step (2), which is mainly to pass through the physical property of liquid nitrogen to stratum progress pressure break.Liquid
Nitrogen has the characteristics that low viscosity, low-density, is able to enter earth formation deep to increase fracturing control area.
(3) liquid nitrogen freezing stratum: continuing to inject liquid nitrogen after step (2), keeps wellbore pressure and stewing well；
In above-mentioned technical proposal step (3), continue to inject liquid nitrogen after upper primary step, keeps wellbore pressure and boil in a covered pot over a slow fire
Well.The liquid nitrogen for injecting target reservoir out of pit shaft at this time can reach crack forward position by the crack that previous step pressure break is formed,
Then the stratum of deeper inside is cooled down, it is identical with pretreatment to the effect on stratum；Liquid nitrogen can gasify and make institute during stewing well simultaneously
It states stratum and generates second of rupture, propagation of cracks length increases fracture network complexity.
(4) injection liquid nitrogen continues pressure break: continuing to inject the liquid nitrogen containing a certain concentration proppant and apply pressure to make mesh
Reservoir crack initiation is marked, to be transformed to deeper inside formation breakdown；
In above-mentioned technical proposal step (4), contain one after further the freezing of previous step liquid nitrogen, continuing injection
Determine the liquid nitrogen of the special proppant of concentration and apply pressure to enable target reservoir crack initiation, to change to deeper inside formation breakdown
It makes.
(5) step (3), (4) are repeated, until completing the fracturing reform of remaining gas hydrates reservoir, reach estimated pressure
Split scale.
Further, in step (2) and step (4), the proppant is density and the extremely-low density branch that liquid nitrogen is adapted
Support agent, density range 0.82-1.08g/cm3。
The invention has the advantages that:
1, the present invention can efficiently use cooling effect of the liquid nitrogen to stratum, increase the brittleness of gas hydrates reservoir,
The initial cracking pressure for reducing stratum, solves that China's South China Sea gas hydrates reservoir rock matrix is loose, diagenesis is poor, weak glue
Knot, permeability are low etc. the problem of being unfavorable for pressing crack construction, conducive to the fracturing reform to target reservoir.
2, when carrying out pressure break to the pretreated stratum of liquid nitrogen, the induced stress that crack generates can promote the present invention
Major fracture and microcrack interact to form fracture network raising crack complexity.In subsequent mining operations, complicated splits
Seam network can play the role of sand control, guarantee gas hydrates yield.
3, during stewing well, liquid nitrogen sufficiently gasifies the present invention after heat exchange occurs with stratum in stratum, leads to pressure
It increases, stratum generates secondary fracturing, increases the transformation volume of pressure break, improves fracture network complexity, improves gas water
Close the fracturing transformation effect of object reservoir.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of the liquid nitrogen fracturing reform device for gas hydrates reservoir；
Fig. 2 is liquid nitrogen fracturing process shaft structure schematic diagram；
Fig. 3 is the flow diagram of liquid nitrogen fracturing reform method.
Wherein, 1, reservoir overlying rock；2, gas hydrates reservoir；3, rock stratum under reservoir；4, pit shaft；4-1, insulation
Fracturing string；4-2, casing；4-3, cement sheath；5, pressure break pump group；6, pressure sensor.
Specific embodiment
The present invention is specifically described with reference to the accompanying drawing:
Refering to fig. 1, a kind of liquid nitrogen fracturing reform device for gas hydrates reservoir, including pit shaft 4, pressure break pump group
5 and pressure sensor 6, pit shaft 4 is reached across reservoir overlying rock 1 to be located under reservoir overlying rock 1 and reservoir rock stratum 3
Gas hydrates reservoir 2, pit shaft 4 includes insulation fracturing string 4-1, casing 4-2 and cement sheath 4-3, is insulated fracturing string
4-1 is arranged in casing 4-2, and cement sheath 4-3 is arranged outside casing 4-2；One end of pressure break pump group 5 and insulation fracturing string 4-1
It is connected, the setting of pressure sensor 6 is on insulation fracturing string 4-1.
As one of embodiment, further, the insulation fracturing string 4-1 selects vacuum heat-insulation oil pipe, energy
Enough guarantee liquid nitrogen from well head be flowed into purpose reservoir after its temperature in effective range.
Refering to Fig. 3, a kind of liquid nitrogen fracturing reform method for gas hydrates reservoir, comprising the following steps:
The pretreatment of step 1. liquid nitrogen: liquid nitrogen is injected into insulation fracturing string 4-1, and is closed after applying certain pressure to it
Pit shaft 4 carries out stewing well or by insulation fracturing string 4-1 circulating liquid nitrogen in pit shaft 4；
Liquid nitrogen temperature be -196 DEG C, be much smaller than formation temperature, liquid nitrogen under the effect of the pressure with the gas hydrates
Reservoir 2 comes into full contact with its cooling temperature, freezes the formation rock pore water near nearly pit shaft 4, rock matrix is by cold events, from
And increase the brittleness of reservoir 2, the tensile strength and initial cracking pressure of reservoir rock are reduced, so that subsequent fracturing work is gone on smoothly；
On the other hand the rock acted on by liquid nitrogen cold shock will form a large amount of microcracks inside it, be conducive to during subsequent fracturing work
Major fracture and microcrack interact, and form complicated fracture network.Wherein, the insulation fracturing string 4-1 is arranged in pit shaft 4
It is interior, as shown in Figure 2.
In order to reduce liquid nitrogen in the heat in pit shaft 4 from well head into target reservoir flow process stratum and pit shaft 4
Exchange.Insulation fracturing string 4-1 in pit shaft 4 uses vacuum heat-insulation oil pipe, due to its good heat insulation, reduces absolutely
The heat exchange of liquid nitrogen and external environment in hot fracturing string 4-1, to ensure that liquid nitrogen reaches the temperature of target reservoir effective
In range, it is conducive to the cooling stratum of subsequent liquid nitrogen and fracturing stratum.
Step 2. liquid nitrogen pressure break: after the pretreatment of step 1 liquid nitrogen, taking step-by-step movement fracturing process, to insulation fracturing string
The liquid nitrogen containing certain density special proppant is further injected into 4-1, carries out fracturing work, after stratum ruptures,
Continue to inject liquid nitrogen, so that the crack that pressure break is formed can continue to extend forward.
Termination of pumping after the completion of construction, does not tear fracturing unit and pipeline open, so as to going on smoothly for subsequent job；
Wherein, it is insulated on fracturing string 4-1 and is provided with pressure sensor 6, injecting liquid nitrogen into insulation fracturing string 4-1
And during applying pressure to it, the current pressure of liquid nitrogen is obtained by pressure sensor 6；When bust occurs for pressure, table
Bright stratum occurs to rupture for the first time.When the moment that stratum ruptures, liquid nitrogen is flowed into stratum, so that the pressure of liquid nitrogen is sent out
Raw bust.Therefore it can know whether stratum ruptures by the variation of liquid nitrogen current pressure.
Wherein, the density of special proppant and liquid nitrogen are adapted, so that proppant can be migrated to target reservoir by liquid nitrogen,
Specially extremely-low density fracturing propping agents, density range is in 0.82-1.08g/cm3；
Step 3. continues to inject liquid nitrogen after the previous step and stewing well, the liquid nitrogen injected at this time can be pressed by upper one
The crack for splitting stage formation reaches crack leading edge, the stratum of higher depth is then cooled down, to cooling effect and step 1 phase on stratum
Together；
During stewing well, the liquid nitrogen in stratum, which can sufficiently gasify to increase pressure stratum is made to occur second, to be ruptured.At this
During one, nitrogen can be flowed into crack, pressure reduction.The current pressure in pit shaft 4 is monitored by pressure sensor 6, when
When pressure is less than scheduled value, into insulation fracturing string 4-1, injection liquid nitrogen is pressurized to improve the effect of second of rupture.This is pre-
Fixed value is the pressure that can make stratum that second of rupture occur.Second of rupture that stratum occurs can be connected to be ruptured for the first time
It is formed by micro-crack and hole, rupture is formed by crack for the first time for effective communication, so as to be formed in stratum more complicated
Fracture network improves fracturing transformation effect.
Liquid nitrogen of step 4. injection containing special proppant continues pressure break, is passing through previous step liquid nitrogen to deeper stratum
It after further freezing, injects liquid nitrogen and applies pressure and enable the crack initiation of deeper inside stratum, continue seam transformation；
Step 5. repetitive cycling step 3,4 are sequentially completed remaining gas hydrates reservoir fracturing improvement.
The present invention, using liquid nitrogen as fracturing fluid, utilizes its special physical property compared with conventional hydraulic pressure break mode
Pressure break is carried out to China's South China Sea gas hydrates reservoir.It avoids due to South China Sea gas hydrates reservoir diagenetic
The problems such as reservoir is difficult to crack initiation caused by the features such as poor, weak cementing, permeability is low.It can be improved after liquid nitrogen transformation pressure break
In-place permeability increases the communication capability on stratum and pit shaft, provides safeguard for subsequent exploitation duration, high efficiency.Liquid nitrogen conduct
A kind of special fracturing fluid has stronger environment friendly, low to reservoir pollution degree, is conducive to subsequent mining operations.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (4)
1. a kind of liquid nitrogen fracturing reform device for gas hydrates reservoir, which is characterized in that including pit shaft, pressure break pump group
And pressure sensor, pit shaft reach natural positioned at rock stratum under reservoir overlying rock and reservoir across reservoir overlying rock
Gas hydrate reservoir, pit shaft include insulation fracturing string, casing and cement sheath, and insulation fracturing string is arranged in casing, cement
Ring is arranged outside casing；Pressure break pump group is connected with one end of insulation fracturing string, and pressure sensor setting is in insulation fracturing string
On.
2. a kind of liquid nitrogen fracturing reform device for gas hydrates reservoir according to claim 1, feature exist
In the insulation fracturing string selects vacuum heat-insulation oil pipe.
3. a kind of liquid nitrogen fracturing reform method for gas hydrates reservoir, which is characterized in that based on such as claim 1 or
Implement described in 2 for the liquid nitrogen fracturing reform device of gas hydrates reservoir, comprising the following steps:
(1) liquid nitrogen pre-processes: injecting liquid nitrogen into insulation fracturing string, closes pit shaft progress after applying pressure to the liquid nitrogen of injection
Stewing well passes through insulation fracturing string circulating liquid nitrogen in pit shaft；
(2) liquid nitrogen pressure break: taking step-by-step movement fracturing process, further injects into insulation fracturing string and supports containing a certain concentration
The liquid nitrogen of agent implements fracturing reform to crisp stratum is increased after pre-processing by liquid nitrogen；
(3) liquid nitrogen freezing stratum: continuing to inject liquid nitrogen after step (2), keeps wellbore pressure and stewing well；
(4) injection liquid nitrogen continues pressure break: continuing to inject the liquid nitrogen containing a certain concentration proppant and apply pressure that target is stored up
Layer crack initiation, to be transformed to deeper inside formation breakdown；
(5) step (3), (4) are repeated, until completing the fracturing reform of remaining gas hydrates reservoir, reach estimated pressure break rule
Mould.
4. a kind of liquid nitrogen fracturing reform method for gas hydrates reservoir according to claim 3, feature exist
In in step (2) and step (4), the proppant is density and the super-low-density proppant that liquid nitrogen is adapted, density range
For 0.82-1.08g/cm3。
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111271036A (en) * | 2020-02-03 | 2020-06-12 | 中国石油大学(北京) | Liquid nitrogen fracturing process method |
| CN111535743A (en) * | 2020-05-13 | 2020-08-14 | 中国地质科学院勘探技术研究所 | Marine natural gas hydrate reservoir transformation appliance and use method thereof |
| JP2021139269A (en) * | 2020-02-28 | 2021-09-16 | インスティチュート オブ ジオロジー アンド ジオフィジックス, チャイニーズ アカデミー オブ サイエンシズInstitute of Geology and Geophysics, Chinese Academy of Sciences | Mining structure of natural gas hydrate reservoir and method of mining natural gas hydrate by injecting hydraulic lime by gas fracturing |
| CN113586022A (en) * | 2021-06-04 | 2021-11-02 | 广州海洋地质调查局 | Method and device for increasing production and improving natural gas hydrate reservoir by freezing and fracturing |
| CN114278263A (en) * | 2021-12-23 | 2022-04-05 | 中国石油大学(北京) | Method for efficiently developing deep geothermal reservoir through liquid nitrogen circulating fracturing |
| CN115247554A (en) * | 2021-04-27 | 2022-10-28 | 中国石油天然气股份有限公司 | Multi-step fracturing method for reducing temperature and increasing brittleness |
| CN115306366A (en) * | 2022-09-13 | 2022-11-08 | 中国石油大学(华东) | Efficient yield-increasing exploitation method for natural gas hydrate |
| CN115450598A (en) * | 2021-12-07 | 2022-12-09 | 中国矿业大学 | Sea area natural gas hydrate solid-state fluidization green mining system and method |
| CN118030005A (en) * | 2024-04-11 | 2024-05-14 | 四川泓腾能源集团有限公司 | Liquid nitrogen fracturing device and use method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605441A (en) * | 2017-08-16 | 2018-01-19 | 西安石油大学 | A kind of apparatus and method that liquid nitrogen is introduced to open hole well |
| CN109441418A (en) * | 2018-10-11 | 2019-03-08 | 中国石油大学(北京) | Low order coal seam freezes the method and device of control critical eigenvalue extension |
| CN109488274A (en) * | 2018-11-29 | 2019-03-19 | 重庆科技学院 | The fracturing yield increasing method of deep layer shale gas |
| CN109707360A (en) * | 2018-12-06 | 2019-05-03 | 中国矿业大学 | A kind of compound fracturing method of high pressure nitrogen-low temperature liquid nitrogen for frscturing |
| CN110080764A (en) * | 2019-05-29 | 2019-08-02 | 河南理工大学 | Liquid nitrogen supercharging device, anti-reflection experimental system and experimental method using the device |
-
2019
- 2019-08-08 CN CN201910727734.2A patent/CN110469313A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107605441A (en) * | 2017-08-16 | 2018-01-19 | 西安石油大学 | A kind of apparatus and method that liquid nitrogen is introduced to open hole well |
| CN109441418A (en) * | 2018-10-11 | 2019-03-08 | 中国石油大学(北京) | Low order coal seam freezes the method and device of control critical eigenvalue extension |
| CN109488274A (en) * | 2018-11-29 | 2019-03-19 | 重庆科技学院 | The fracturing yield increasing method of deep layer shale gas |
| CN109707360A (en) * | 2018-12-06 | 2019-05-03 | 中国矿业大学 | A kind of compound fracturing method of high pressure nitrogen-low temperature liquid nitrogen for frscturing |
| CN110080764A (en) * | 2019-05-29 | 2019-08-02 | 河南理工大学 | Liquid nitrogen supercharging device, anti-reflection experimental system and experimental method using the device |
Non-Patent Citations (1)
| Title |
|---|
| 杨良泽等: "液氮压裂技术及其前景分析", 《科技创新与生产力》 * |
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