CN109403940A - Liquid nitrogen pressure break is applied to the experimental method and experimental provision of geothermal exploitation - Google Patents
Liquid nitrogen pressure break is applied to the experimental method and experimental provision of geothermal exploitation Download PDFInfo
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- CN109403940A CN109403940A CN201811501970.4A CN201811501970A CN109403940A CN 109403940 A CN109403940 A CN 109403940A CN 201811501970 A CN201811501970 A CN 201811501970A CN 109403940 A CN109403940 A CN 109403940A
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 220
- 229910052757 nitrogen Inorganic materials 0.000 title claims abstract description 110
- 239000007788 liquid Substances 0.000 title claims abstract description 99
- 238000002474 experimental method Methods 0.000 title claims abstract description 31
- 239000011435 rock Substances 0.000 claims abstract description 111
- 238000004088 simulation Methods 0.000 claims abstract description 29
- 239000012530 fluid Substances 0.000 claims abstract description 27
- 230000006378 damage Effects 0.000 claims abstract description 17
- 239000011148 porous material Substances 0.000 claims abstract description 13
- 238000002347 injection Methods 0.000 claims abstract description 5
- 239000007924 injection Substances 0.000 claims abstract description 5
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 230000008676 import Effects 0.000 claims description 9
- 230000001066 destructive effect Effects 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 5
- 239000003292 glue Substances 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000009423 ventilation Methods 0.000 claims 1
- 230000008646 thermal stress Effects 0.000 abstract description 9
- 238000011161 development Methods 0.000 abstract description 5
- 239000004615 ingredient Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
- 230000035882 stress Effects 0.000 description 4
- 230000007613 environmental effect Effects 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000011084 recovery Methods 0.000 description 2
- 208000019901 Anxiety disease Diseases 0.000 description 1
- 239000002028 Biomass Substances 0.000 description 1
- 230000036506 anxiety Effects 0.000 description 1
- 238000003287 bathing Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 239000000686 essence Substances 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000000926 separation method Methods 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
- E21B43/25—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
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
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- 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)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses experimental methods and experimental provision that a kind of liquid nitrogen pressure break is applied to geothermal exploitation, it is related to Development of Geothermal Resources technical field, the experimental method includes: to drill through required rock sample, rock sample is processed into the shape to match with confining pressure device, it is drilled on rock sample to form hole simultaneously, and production forms simulation wellbore hole in hole；Rock sample is heated so that rock sample reaches the preset temperature of simulation underground heat；The rock sample for being up to the preset temperature of simulation underground heat is installed into confining pressure device, applies default confining pressure and default pore pressure to rock sample by confining pressure device；Liquid nitrogen fracturing fluid is injected into the hole of rock sample, when the pressure of liquid nitrogen fracturing fluid reaches preset pressure condition, is terminated injection liquid nitrogen fracturing fluid and is unloaded confining pressure；Deng.The application, which can simulate, uses liquid nitrogen to carry out destruction situation of the pressure break to study thermal stress caused by ultralow temperature to the rock near underground heat to the rock near underground heat.
Description
Technical field
The present invention relates to Development of Geothermal Resources technical field, in particular to a kind of liquid nitrogen pressure break is applied to the reality of geothermal exploitation
Proved recipe method and experimental provision.
Background technique
Underground heat is the heat being stored under earth's surface that earth interior generates, after geothermal energy has become and coal, petroleum
One of important alternative energy source is member important in the new energy fields such as solar energy, wind energy, biomass energy, is a kind of nothing
Pollution or the renewable cleaning green energy resource seldom polluted.China is geothermal energy resources country more abundant, especially warm
The middle low-temperature geothermal resource spent between 25 DEG C to 150 DEG C almost spreads the whole nation.The development and utilization of geothermal energy resources are surging forward, especially
It is that have the very big market demand after the 1990s, is widely used in power generation, temperature is planted, aquatic products is supported
It grows, bathing of recuperating, heating etc. are related to the various aspects of people's lives.China's geothermal energy resources abundant are to alleviate Chinese energy anxiety
Situation and protection environment play an important role.
Liquid nitrogen has the characteristics that colorless and odorless, is to be drilled a kind of working fluid common in well.Geothermal energy resources buried depth is big, temperature
Degree is high, can generate the huge temperature difference after it and liquid nitrogen interaction, and then will generate very big temperature stress.Studies have shown that liquid
Thermal stress caused by nitrogen ultralow temperature can make rock occur to rupture and accelerate the extension of rock fracture, and the water in blowhole is super
Huge frost-heave force can be generated by freezing under low temperature, thus destruction of the aggravation to rock.For now, by ultra-low temperature liquid nitrogen pressure break
Theory for exploitation of geothermal is also seldom, is a lack of corresponding experimental method especially to study liquid nitrogen pressure break for geothermal exploitation
Experimentation.Therefore, the experimental method that a kind of liquid nitrogen pressure break is applied to geothermal exploitation is needed, for can efficiently develop in the future
Geothermal energy resources.
Summary of the invention
In order to overcome the drawbacks described above of the prior art, the technical problem to be solved is that provide one kind for the embodiment of the present invention
Liquid nitrogen pressure break is applied to the experimental method and experimental provision of geothermal exploitation, can simulate using liquid nitrogen to the rock near underground heat
Pressure break is carried out to study thermal stress caused by ultralow temperature to the destruction situation of the rock near underground heat.
The specific technical solution of the embodiment of the present invention is:
A kind of liquid nitrogen pressure break is applied to the experimental method of geothermal exploitation, and the liquid nitrogen pressure break is applied to the experiment of geothermal exploitation
Method includes:
Required rock sample is drilled through, the rock sample is processed into the shape to match with confining pressure device, while
It is drilled on the rock sample to form hole, and production forms simulation wellbore hole in described hole；
After formation simulation wellbore hole to be produced, the rock sample is heated so that the rock sample reaches simulation ground
The preset temperature of heat；
The rock sample for being up to the preset temperature of simulation underground heat is installed into confining pressure device, and the confining pressure device pair is passed through
The rock sample applies default confining pressure and default pore pressure；
Liquid nitrogen fracturing fluid is injected into the described hole of the rock sample, the pressure to liquid nitrogen fracturing fluid reaches default pressure
When power condition, terminates and inject the liquid nitrogen fracturing fluid and unload confining pressure；
After unloading confining pressure, the rock sample is cut and observes the fracturing fracture inside the rock sample
The damage -form of destructive characteristics and fracturing fracture.
Preferably, the preset temperature for simulating underground heat is between 150 degree to 300 degree.
Preferably, the preset pressure condition is that the pressure of liquid nitrogen fracturing fluid declines and stablizes under crustal stress.
Preferably, the cavity inside the confining pressure device is in cylindrical type, and the rock sample is in cylindrical type.
Preferably, the rock sample section is carried out along the axis of described hole to cut intuitively to observe the rock
The destructive characteristics of fracturing fracture inside stone test specimen and the damage -form of fracturing fracture.
Preferably, it drills on the rock sample to form hole, and be coated with ab on the inner wall of described hole
Glue, and conserve the rock sample at dry and ventilated to form simulation wellbore hole.
Preferably, it when the pressure of liquid nitrogen fracturing fluid reaches preset pressure condition, terminates and injects the liquid nitrogen fracturing fluid simultaneously
Confining pressure, pore pressure and the pressure for injecting liquid nitrogen fracturing fluid are unloaded, the rock sample is further taken out.
Preferably, after formation simulation wellbore hole to be produced, the rock sample is put into heated into heater box so that
The rock sample reaches the preset temperature of simulation underground heat.
A kind of liquid nitrogen pressure break used in the experimental method that any of the above-described liquid nitrogen pressure break is applied to geothermal exploitation
Applied to the experimental provision of geothermal exploitation, the experimental provision that the liquid nitrogen pressure break is applied to geothermal exploitation includes:
Nitrogen cylinder；Gas-booster, the import of the gas-booster are connected with the nitrogen cylinder；Liquid nitrogen bottle；Isolation
First import of device, the isolator is connected with the outlet of the gas-booster, the second import of the isolator and institute
Liquid nitrogen bottle is stated to be connected；Confining pressure device, for loading the rock sample, the liquid nitrogen of the confining pressure device enters the confining pressure device
Mouth is connected with the outlet of the isolator.
Preferably, the liquid nitrogen entrance of the confining pressure device is connected with the simulation wellbore hole of the rock sample.
Technical solution of the present invention have it is following significant the utility model has the advantages that
Liquid nitrogen pressure break in the application, which is applied to the experimental method of geothermal exploitation and experimental provision, can simulate using liquid nitrogen
Pressure break is carried out to the rock near underground heat to study thermal stress caused by ultralow temperature to the destruction situation of the rock near underground heat, when
When ultra-low temperature liquid nitrogen injects stratum as fracturing fluid, complicated seam net can be advantageously formed, in addition the effect of nitrogen ultra low temperature,
Pore water frost heave in rock makes rock interior generate new large scale hole, so that crack extends, and then further increases
Add the flow conductivity on stratum, complicated seam net and big flow conductivity can increase in later development underground heat receives geothermal energy
Contact area, to improve underground heat recovery ratio, the application can be by using different confining pressure condition, different in simulated experiment
The rock sample that pore pressure, different preset temperatures, different type rock are processed into is various in exploitation of geothermal to simulate
Environmental condition locating for rock at Different Strata, using different pressures ultralow temperature liquid nitrogen solution to the rock near underground heat into
Row pressure break passes through the destructive characteristics and pressure break of the fracturing fracture inside obtained rock sample centered on rock sample Hole
The damage -form in crack is to study destruction of the thermal stress caused by ultralow temperature to the rock near underground heat under different condition environment
Situation.
Referring to following description and accompanying drawings, only certain exemplary embodiments of this invention is disclosed in detail, specifies original of the invention
Reason can be in a manner of adopted.It should be understood that embodiments of the present invention are not so limited in range.In appended power
In the range of the spirit and terms that benefit requires, embodiments of the present invention include many changes, modifications and are equal.For a kind of reality
The feature that the mode of applying is described and/or shown can be made in one or more other embodiments in a manner of same or similar
With, be combined with the feature in other embodiment, or substitution other embodiment in feature.
Detailed description of the invention
Attached drawing described here is only used for task of explanation, and is not intended to limit model disclosed by the invention in any way
It encloses.In addition, shape and proportional sizes of each component in figure etc. are only schematical, it is used to help the understanding of the present invention, and
It is not the specific shape and proportional sizes for limiting each component of the present invention.Those skilled in the art under the teachings of the present invention, can
Implement the present invention to select various possible shapes and proportional sizes as the case may be.
Fig. 1 is the step flow chart for the experimental method that liquid nitrogen pressure break is applied to geothermal exploitation in the embodiment of the present invention；
Fig. 2 is that liquid nitrogen pressure break is applied to partial system diagram in the experimental provision of geothermal exploitation in the embodiment of the present invention；
Fig. 3 is the structure that liquid nitrogen pressure break is applied to confining pressure device in the experimental provision of geothermal exploitation in the embodiment of the present invention
Figure.
The appended drawing reference of the figures above:
1, nitrogen cylinder；2, liquid nitrogen bottle；3, gas-booster；4, isolator；5, confining pressure device；51, liquid nitrogen entrance；52, it opens
Hole.
Specific embodiment
With reference to the drawings and the description of the specific embodiments of the present invention, details of the invention can clearly be understood.But
It is the specific embodiment of invention described herein, purpose for explaining only the invention, and cannot understand in any way
At being limitation of the present invention.Under the teachings of the present invention, technical staff is contemplated that based on any possible change of the invention
Shape, these are regarded as belonging to the scope of the present invention.It should be noted that when element is referred to as " being set to " another yuan
Part, it can directly on the other element or there may also be elements placed in the middle.When an element is considered as " connection "
Another element, it can be directly to another element or may be simultaneously present centering elements.Term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be mechanical connection or electrical connection, are also possible to inside two elements
Connection, can be directly connected, can also indirectly connected through an intermediary, for the ordinary skill in the art,
The concrete meaning of above-mentioned term can be understood as the case may be.Term as used herein " vertical ", " horizontal ",
"upper", "lower", "left", "right" and similar statement for illustrative purposes only, are not meant to be the only embodiment.
Unless otherwise defined, all technical and scientific terms used herein and the technical field for belonging to the application
The normally understood meaning of technical staff is identical.The term used in the description of the present application is intended merely to description tool herein
The purpose of the embodiment of body, it is not intended that in limitation the application.Term as used herein "and/or" includes one or more
Any and all combinations of relevant listed item.
Liquid nitrogen is used to carry out pressure break to the rock near underground heat to study thermal stress caused by ultralow temperature in order to simulate
To the destruction situation of the rock near underground heat, a kind of liquid nitrogen pressure break is proposed in the embodiment of the present application and is applied to geothermal exploitation
Experimental method, Fig. 1 are the step flow chart for the experimental method that liquid nitrogen pressure break is applied to geothermal exploitation in the embodiment of the present invention, are such as schemed
Shown in 1, the experimental method that liquid nitrogen pressure break is applied to geothermal exploitation be may comprise steps of:
S101: drilling through required rock sample, rock sample is processed into the shape to match with confining pressure device 5, simultaneously
It is drilled on rock sample to form hole, and production forms simulation wellbore hole in hole.
In this step, it can reprocess from outdoor acquirement rock and drill through required rock sample, and light of being polished
Sliding, rock sample can be processed into the shape to match with confining pressure device 5, for example, the specification of Rock Sample Size selection can be with
It is the cylinder that diameter is 50mm, length is 80mm, the type of rock is not defined in this application.Simultaneously along cylinder
It is 4mm that the axis of shape drills through diameter on rock sample, and length is the hole of 40mm, so that adapting to experiment needs certainly can also
The hole of other specifications is chosen, any restrictions are not done to the specification of hole in this application.Then, in the inner wall of hole
On be coated with ab glue, and conserve rock sample at dry and ventilated to form simulation wellbore hole.Rock sample is cylindrical can
In order to which the later period applies confining pressure by confining pressure device 5, to preferably simulate underground three-dimensional stress state.
S102: after formation simulation wellbore hole to be produced, rock sample is heated so that rock sample reaches simulation underground heat
Preset temperature.
In this step, after formation simulation wellbore hole to be produced, rock sample is put into heated into heater box so that
Rock sample reaches the preset temperature of simulation underground heat.Usually reality in actual geotemperature between 150 degree to 300 degree, because
This, the preset temperature for simulating underground heat can be set between 150 degree to 300 degree.In an experiment in order to fully demonstrate ultralow temperature liquid
Nitrogen and effect of the thermal stress to rock caused by rock contact under underground heat that be in, the preset temperature for simulating underground heat can be preferred
300 degree, to keep it larger with the temperature difference of ultra-low temperature liquid nitrogen.
S103: the rock sample for being up to the preset temperature of simulation underground heat is installed into confining pressure device 5, and confining pressure device is passed through
5 pairs of rock samples apply default confining pressure and default pore pressure.
In this step, the rock sample for being up to the preset temperature of simulation underground heat takes out from heater box, then installs
Into confining pressure device 5.During the installation process, the liquid nitrogen entrance 51 of confining pressure device 5 is connected with the simulation wellbore hole of rock sample.
Default confining pressure and default pore pressure are applied to rock sample by confining pressure device 5, to simulate at practical subsurface rock
Environmental condition.Fig. 2 is that liquid nitrogen pressure break is applied to partial system diagram in the experimental provision of geothermal exploitation, figure in the embodiment of the present invention
3 are applied to the structure chart of confining pressure device in the experimental provision of geothermal exploitation for liquid nitrogen pressure break in the embodiment of the present invention, such as Fig. 2 and figure
Shown in 3, it may include: nitrogen cylinder 1 that used liquid nitrogen pressure break, which is applied to the experimental provision of geothermal exploitation, in this application；Gas
The import of supercharger 3, gas-booster 3 is connected with nitrogen cylinder 1；Liquid nitrogen bottle 2；Isolator 4, the first import of isolator 4 with
The outlet of gas-booster 3 is connected, and the second import of isolator 4 is connected with liquid nitrogen bottle 2；Confining pressure device 5, confining pressure device 5
For loading rock sample, the liquid nitrogen entrance 51 of confining pressure device 5 is connected with the outlet of isolator 4.Chamber inside confining pressure device 5
Body can be in cylindrical type, have an aperture 52 on side wall, be used to connect the first supercharging device, thus in confining pressure device 5
Rock sample apply confining pressure.The second supercharging device is connected in the liquid nitrogen entrance 51 of confining pressure device 5, while in confining pressure device 5
Outlet setting pressure reducing valve, by adjusting the opening and closing degree of the second supercharging device and pressure reducing valve to control the big of default pore pressure
It is small.
S104: injecting liquid nitrogen fracturing fluid into the hole of rock sample, and the pressure to liquid nitrogen fracturing fluid reaches preset pressure
When condition, terminates injection liquid nitrogen fracturing fluid and unload confining pressure.
In the present embodiment, the gas-booster 3 being applied to by liquid nitrogen pressure break in the experimental provision of geothermal exploitation is given
The nitrogen that nitrogen cylinder 1 flows out is pressurized, and then nitrogen and liquid nitrogen are connected into respectively in isolator 4, added by 4 nitrogen of isolator
Pressure pushes liquid nitrogen to be input in the liquid nitrogen entrance 51 of confining pressure device 5.In liquid nitrogen injection process, it is recorded in the effect of liquid nitrogen fracturing fluid
Under pressure curve, and pressure data is recorded, when the pressure of liquid nitrogen fracturing fluid reaches preset pressure condition, this is default
The pressure that pressure condition can be liquid nitrogen fracturing fluid declines and stablizes under crustal stress, then terminates injection liquid nitrogen fracturing fluid and unloads
Confining pressure, pore pressure and the pressure for injecting liquid nitrogen fracturing fluid are carried, then takes out rock sample from confining pressure device 5.Above-mentioned liquid nitrogen pressure
The pressure for splitting liquid can be understood as hole to the pressure measured between the outlet of isolator 4.
S105: after unloading confining pressure, rock sample is cut and observes the broken of the fracturing fracture inside rock sample
The damage -form of bad feature and fracturing fracture.
In this step, rock sample section is carried out along the axis of hole to cut intuitively to observe in rock sample
The destructive characteristics of fracturing fracture of the portion centered on rock sample Hole and the damage -form of fracturing fracture, and it is clapped
According to record, to be ready for post analysis.
Liquid nitrogen pressure break in the application, which is applied to the experimental method of geothermal exploitation and experimental provision, can simulate using liquid nitrogen
Pressure break is carried out to the rock near underground heat to study thermal stress caused by ultralow temperature to the destruction situation of the rock near underground heat, when
When ultra-low temperature liquid nitrogen injects stratum as fracturing fluid, complicated seam net can be advantageously formed, in addition the effect of nitrogen ultra low temperature,
Pore water frost heave in rock makes rock interior generate new large scale hole, so that crack extends, and then further increases
Add the flow conductivity on stratum, complicated seam net and big flow conductivity can increase in later development underground heat receives geothermal energy
Contact area, to improve underground heat recovery ratio, the application can be by using different confining pressure condition, different in simulated experiment
The rock sample that pore pressure, different preset temperatures, different type rock are processed into is various in exploitation of geothermal to simulate
Environmental condition locating for rock at Different Strata, using different pressures ultralow temperature liquid nitrogen solution to the rock near underground heat into
Row pressure break passes through the destructive characteristics and pressure break of the fracturing fracture inside obtained rock sample centered on rock sample Hole
The damage -form in crack is to study destruction of the thermal stress caused by ultralow temperature to the rock near underground heat under different condition environment
Situation.
All articles and reference disclosed, including patent application and publication, for various purposes by quoting knot
Together in this.Describing combined term " substantially by ... constitute " should include identified element, ingredient, component or step and reality
Other elements, ingredient, component or the step of the basic novel feature of the combination are not influenced in matter.Using term "comprising" or
" comprising " describes the combination of element here, ingredient, component or step it is also contemplated that substantially by these elements, ingredient, component
Or the embodiment that step is constituted.Here by using term " can with ", it is intended to illustrate that " can with " includes described any
Attribute is all optional.Multiple element, ingredient, component or step can be mentioned by single integrated component, ingredient, component or step
For.Alternatively, single integrated component, ingredient, component or step can be divided into multiple element, ingredient, component or the step of separation
Suddenly.For describe the open "a" or "an" of element, ingredient, component or step do not say in order to exclude other elements, at
Point, component or step.
All the embodiments in this specification are described in a progressive manner, the highlights of each of the examples are with
The difference of other embodiments, the same or similar parts between the embodiments can be referred to each other.Above-described embodiment is only
Illustrate technical concepts and features of the invention, its object is to those skilled in the art can understand the contents of the present invention
And implement accordingly, it is not intended to limit the scope of the present invention.Equivalence changes made by all Spirit Essences according to the present invention
Or modification, it should be covered by the protection scope of the present invention.
Claims (10)
1. the experimental method that a kind of liquid nitrogen pressure break is applied to geothermal exploitation, which is characterized in that the liquid nitrogen pressure break is applied to underground heat
The experimental method of exploitation includes:
Required rock sample is drilled through, the rock sample is processed into the shape to match with confining pressure device, while described
It is drilled on rock sample to form hole, and production forms simulation wellbore hole in described hole；
After formation simulation wellbore hole to be produced, the rock sample is heated so that the rock sample reaches simulation underground heat
Preset temperature；
The rock sample for being up to the preset temperature of simulation underground heat is installed into confining pressure device, by the confining pressure device to described
Rock sample applies default confining pressure and default pore pressure；
Liquid nitrogen fracturing fluid is injected into the described hole of the rock sample, the pressure to liquid nitrogen fracturing fluid reaches preset pressure item
When part, terminates and inject the liquid nitrogen fracturing fluid and unload confining pressure；
After unloading confining pressure, the rock sample is cut and observes the destruction of the fracturing fracture inside the rock sample
The damage -form of feature and fracturing fracture.
2. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that simulation underground heat
Preset temperature be 150 degree to 300 degree between.
3. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that described default
Pressure condition is that the pressure of liquid nitrogen fracturing fluid declines and stablizes under crustal stress.
4. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that the confining pressure
Cavity inside device is in cylindrical type, and the rock sample is in cylindrical type.
5. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that by the rock
Stone test specimen carries out section along the axis of described hole and cuts intuitively to observe the fracturing fracture inside the rock sample
The damage -form of destructive characteristics and fracturing fracture.
6. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that in the rock
It is drilled on stone test specimen to form hole, and is coated with ab glue on the inner wall of described hole, and make the rock sample dry
Dry ventilation is conserved to form simulation wellbore hole.
7. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that liquid nitrogen pressure
When splitting the pressure of liquid and reaching preset pressure condition, terminates and inject the liquid nitrogen fracturing fluid and simultaneously unload confining pressure, pore pressure and injection
The pressure of liquid nitrogen fracturing fluid further takes out the rock sample.
8. the experimental method that liquid nitrogen pressure break according to claim 1 is applied to geothermal exploitation, which is characterized in that shape to be produced
After simulation wellbore hole, the rock sample is put into and is heated into heater box so that the rock sample reaches simulation underground heat
Preset temperature.
What 9. a kind of liquid nitrogen pressure break any in claim 1 to 8 was applied to use in the experimental method of geothermal exploitation
Liquid nitrogen pressure break is applied to the experimental provision of geothermal exploitation, which is characterized in that the liquid nitrogen pressure break is applied to the experiment of geothermal exploitation
Device includes:
Nitrogen cylinder；Gas-booster, the import of the gas-booster are connected with the nitrogen cylinder；Liquid nitrogen bottle；Isolator, institute
The first import for stating isolator is connected with the outlet of the gas-booster, the second import of the isolator and the liquid nitrogen
Bottle is connected；Confining pressure device, the confining pressure device is for loading the rock sample, the liquid nitrogen entrance of the confining pressure device and institute
The outlet for stating isolator is connected.
10. the experimental provision that a kind of liquid nitrogen pressure break according to claim 9 is applied to geothermal exploitation, which is characterized in that institute
The liquid nitrogen entrance for stating confining pressure device is connected with the simulation wellbore hole of the rock sample.
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| CN201811501970.4A CN109403940B (en) | 2018-12-10 | 2018-12-10 | Experimental method and experimental device for applying liquid nitrogen fracturing to geothermal development |
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| CN201811501970.4A CN109403940B (en) | 2018-12-10 | 2018-12-10 | Experimental method and experimental device for applying liquid nitrogen fracturing to geothermal development |
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|---|---|---|---|---|
| CN109882165A (en) * | 2019-04-04 | 2019-06-14 | 成都理工大学 | The geothermal energy resources exploitation simulator and operating method of microwave heating and infrared measurement of temperature |
| CN110320109A (en) * | 2019-07-02 | 2019-10-11 | 中国石油大学(北京) | Monitor the test method and its device of high temperature plate oil shale fracturing process |
| CN111197949A (en) * | 2020-01-15 | 2020-05-26 | 中国一冶集团有限公司 | Superconducting magnetic repulsion rock static blasting device |
| CN111550187A (en) * | 2020-05-08 | 2020-08-18 | 中国石油大学(北京) | Liquid nitrogen jet comprehensive experiment system under confining pressure |
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| CN112377162B (en) * | 2020-10-12 | 2022-10-28 | 重庆交通大学 | Method and spray head for crushing hot dry rock by liquid nitrogen cold impact composite high-pressure water jet |
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