CN109298162A - Different phase carbon dioxide fracturing shale device and experimental method - Google Patents
Different phase carbon dioxide fracturing shale device and experimental method Download PDFInfo
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- CN109298162A CN109298162A CN201811467133.4A CN201811467133A CN109298162A CN 109298162 A CN109298162 A CN 109298162A CN 201811467133 A CN201811467133 A CN 201811467133A CN 109298162 A CN109298162 A CN 109298162A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 63
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 55
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 29
- 238000002474 experimental method Methods 0.000 title claims abstract description 11
- 238000012360 testing method Methods 0.000 claims abstract description 89
- 238000000034 method Methods 0.000 claims abstract description 18
- 238000012544 monitoring process Methods 0.000 claims abstract description 15
- 230000006378 damage Effects 0.000 claims abstract description 11
- 230000035699 permeability Effects 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000005336 cracking Methods 0.000 claims abstract description 8
- 239000007788 liquid Substances 0.000 claims abstract description 5
- 239000000203 mixture Substances 0.000 claims abstract description 4
- 230000000694 effects Effects 0.000 claims description 8
- 238000002591 computed tomography Methods 0.000 claims description 6
- 238000012545 processing Methods 0.000 claims description 6
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 239000011435 rock Substances 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000001066 destructive effect Effects 0.000 claims description 2
- 239000002828 fuel tank Substances 0.000 claims description 2
- 238000002347 injection Methods 0.000 claims description 2
- 239000007924 injection Substances 0.000 claims description 2
- 238000007711 solidification Methods 0.000 claims description 2
- 230000008023 solidification Effects 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims 1
- 241000790917 Dioxys <bee> Species 0.000 claims 1
- 229910052799 carbon Inorganic materials 0.000 claims 1
- 230000000149 penetrating effect Effects 0.000 claims 1
- 238000011161 development Methods 0.000 abstract description 3
- 230000007246 mechanism Effects 0.000 abstract description 3
- 208000035126 Facies Diseases 0.000 description 2
- 208000037656 Respiratory Sounds Diseases 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 239000002734 clay mineral Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000005065 mining Methods 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 238000013517 stratification Methods 0.000 description 1
- 230000008961 swelling Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/24—Earth materials
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
- G01N3/10—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces generated by pneumatic or hydraulic pressure
- G01N3/12—Pressure testing
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0014—Type of force applied
- G01N2203/0016—Tensile or compressive
- G01N2203/0019—Compressive
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- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/003—Generation of the force
- G01N2203/0042—Pneumatic or hydraulic means
- G01N2203/0048—Hydraulic means
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0058—Kind of property studied
- G01N2203/006—Crack, flaws, fracture or rupture
- G01N2203/0067—Fracture or rupture
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/02—Details not specific for a particular testing method
- G01N2203/06—Indicating or recording means; Sensing means
- G01N2203/0658—Indicating or recording means; Sensing means using acoustic or ultrasonic detectors
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Abstract
The present invention relates to a kind of different phase carbon dioxide fracturing shale device and experimental methods, belong to shale gas exploitation technical field.The device includes constant temperature oil bath, normal triaxial loading system, acoustic emission monitoring system, CO2Frac system, control system, deformation test system and gas flowmeter composition；Constant temperature oil bath is for controlling experimental temperature；Normal triaxial loading system is used to load shale test specimen different axis pressure and confining pressure；Acoustic emission monitoring system monitors the characteristics of Acoustic Emission of different phase carbon dioxide fracturing shale overall process, Three-dimensional damage positioning and the critical initial cracking pressure of shale；CO2Frac system is used to the inside of shale test specimen inject the CO of different phase2；Control system controls the axis pressure and confining pressure of triaxial cell.The device is by adjusting temperature and CO2Pressure, being capable of physical analogy gaseous state, liquid, supercritical CO2Fracturing shale mechanism tests the permeability before and after shale fracturing, is CO2Efficient Development shale gas provides advanced experiment condition.
Description
Technical field
The invention belongs to shale gas exploitation technical field, it is related to a kind of different phase carbon dioxide fracturing shale device and reality
Proved recipe method.
Background technique
China's richness organic shale is widely distributed, and southern area, North China and Tarim Basin In Xinjiang etc. develop marine facies
Shale, North China, the Junggar Basin, Turpan- Hami basin, Ordos Basin, Bohai gulf basin and Song-liao basin etc. develop terrestrial facies
Shale, shale gas mining resources amount are about 25,000,000,000,000 m3, it is more than conventional gas resource.Currently large-scale business development
Shale gas, has had been established the shale gas demonstration area such as Fuling, Changning, Weiyuan, Zhaotong, Yan'an, and annual capacity reaches 10,000,000,000 m3, 2017
Year shale gas yield is up to 6,500,000,000 m3, planning the year two thousand twenty shale gas total output is 30,000,000,000 m3。
For shale gas mainly with ADSORPTION STATE and free state preservation in shale reservoir, adsorbed state accounts for 20%~85%, due to
Shale gas reservoir reservoir has typical low porosity and low permeability feature, and porosity is generally 4%~6%, and permeability is less than 0.001 × 10-3μ
m2, therefore the exploitation of shale gas must carry out reservoir fracturing and anatonosis transformation, mainly use horizontal well, waterpower pressure both at home and abroad at present
It splits, CO2Fracturing technique improves the extraction rate of shale gas.
CO2Fracturing technique Efficient Development shale gas advantage has: being easy to seam (CO2Viscosity is low, and initial cracking pressure is low, is easily formed multiple
Miscellaneous crack), reservoir damage (row of returning is fast, inhibits clay mineral hydration swelling) is reduced, CH is replaced4, it saves water, reduces pollution,
Good economy performance, and CO can be sealed up for safekeeping2, reduce greenhouse effects.
Mechanism study at present both at home and abroad about carbon dioxide fracturing shale is not deep enough, and experimental provision is developed less,
It is badly in need of the research that the corresponding experimental provision of independent research carries out this respect.
Summary of the invention
In view of this, the purpose of the present invention is to provide a kind of different phase carbon dioxide fracturing shale device and experiment sides
Method.
In order to achieve the above objectives, the invention provides the following technical scheme:
A kind of different phase carbon dioxide fracturing shale device, the device include constant temperature oil bath (1), normal triaxial load system
System (2), acoustic emission monitoring system (9), CO2Frac system (10), control system (7), deformation test system (8) and gas flow
It counts (14)；
The constant temperature oil bath (1) is for controlling experimental temperature；
The normal triaxial loading system (2) is used to load not shale test specimen coaxially pressure and confining pressure；
The characteristics of Acoustic Emission of acoustic emission monitoring system (9) the monitoring different phase carbon dioxide fracturing shale overall process,
Three-dimensional damage positioning and the critical initial cracking pressure of shale；
The CO2Frac system (10) is used to the inside of shale test specimen inject the CO of different phase2；
The axis pressure and confining pressure of control system (7) control triaxial cell；
The deformation test system (8) is used for the CO of different phase2When pressure break, the deformation of shale test specimen；
The gas flowmeter (14) is for testing CH4Flow.
Further, the constant temperature oil bath (1) includes fuel tank and temperature controller (6), for controlling experimental temperature.
Further, the normal triaxial loading system includes hydraulic pump (2), triaxial cell (3), rack (15) and vacuum
Pump.
The rack (15) promotes triaxial cell (3) with electronic screw rod, and vacuum pump vacuumizes shale test specimen (5), leads to
It crosses hydraulic pump and coaxially pressure and confining pressure is loaded not to shale test specimen (5).
Further, the acoustic emission monitoring system (9) includes sound emission host, display (12) and acoustic emission sensor
(4), face for monitoring characteristics of Acoustic Emission, Three-dimensional damage positioning and the shale of different phase carbon dioxide fracturing shale overall process
Boundary's initial cracking pressure；The characteristics of Acoustic Emission includes amplitude, energy, event and ring.
Further, the CO2Frac system (10) is by twin columns piston pump, CO2And CH4Gas cylinder composition, is used for shale test specimen
(5) CO of internal injection different phase2Fracturing shale, twin columns piston pump inject CO using constant pressure or constant current mode2；The difference
Phase includes gaseous state, liquid and supercritical CO2。
Further, control system (7) control hydraulic pump (2) is pressed and is enclosed to the stabilization axis that triaxial cell (3) provide
Pressure.
Further, the deformation test system (8) is made of axial deformation sensor (11) and transversely deforming sensor, surveys
Try the CO of different phase2The deformation of test specimen when fracturing shale.
Further, the gas flowmeter (14) is used to test the flow of CH4 before and after shale test specimen pressure break, according to flowmeter
The permeability before and after shale pressure break is calculated, CO is evaluated2Fracturing shale anatonosis effect.
Experimental method based on described device, method includes the following steps:
Step 1: the shale block that scene is fetched test specimen processing: is made as φ 100mm × 200mm circle in rock sample Processing Room
Cylinder, then in the pressure break hole of test specimen centre drill φ 20mm × 150mm；
Step 2: the test specimen processed is subjected to CT scan；
Step 3: pressure break pipe is put into the pressure break hole of test specimen, and 593 curing agent and epoxy resin are then injected into hole,
After solidification, pressure break pipe and pressure break hole tube wall firm pasting are allowed, reach sealing effect.Wherein seal section is 80mm, and fracturing section is
70mm；
Step 4: test specimen is put into triaxial cell, and pressure head is sealed with shale test specimen with heat-shrinkable tube, is being heat-shrinked
Acoustic emission sensor is pasted in pipe surface, and is connected with Acoustic radiating instrument, then sealed pressure room, pressure break pipeline and piston pump
Connection；
Step 5: triaxial cell is put into constant temperature oil bath, and start-up temperature controller is heated to experimental temperature；
Step 6: opening vacuum pump and vacuumize to shale test specimen, and after reaching vacuum degree, starting hydraulic pump adds centainly to test specimen
Axis pressure and confining pressure；
Step 7: high pressure CH is opened4Gas cylinder is filled with the CH of certain pressure to shale test specimen upper end4, to test specimen lower end CH4Stream
After amount is stablized, recording flowmeter reading calculates the original permeability of shale；
Step 8: Acoustic radiating instrument is opened, acoustic emission parameters, the data of required acquisition and figure are set；
Step 9: opening twin columns piston pump, carbon dioxide is injected to the pressure break hole of shale test specimen upper end, using constant pressure or perseverance
Stream mode injects CO2, inject pressurization while, monitoring shale test specimen axially and transversely deform, the sound emission in fracturing process
Feature, Three-dimensional damage location data；
Step 10: shale test specimen crushes split after, repeat the 7th step, test shale test specimen pressure break after CH4Flow, calculate seep
Saturating rate；
Step 11: after experiment pressure break, taking out test specimen, observes destructive characteristics and the direction in pressure break hole, and takes pictures, so
Carry out secondary CT scan again afterwards.
The beneficial effects of the present invention are:
(1) physical analogy gaseous state, liquid, supercritical CO2Fracturing shale mechanism；
(2) permeability before and after fracturing shale can be tested, anatonosis effect is evaluated；
(3) CO can be monitored2Characteristics of Acoustic Emission, Three-dimensional damage positioning and the initial cracking pressure of fracturing shale.
Detailed description of the invention
In order to keep the purpose of the present invention, technical scheme and beneficial effects clearer, the present invention provides following attached drawing and carries out
Illustrate:
Fig. 1 is the front view of device of the present invention；
Fig. 2 is the carbon dioxide pressure break shale acoustic emission sensor arrangement schematic diagram of device of the present invention；
Fig. 3 is carbon dioxide pressure break shale experimental result；
Fig. 4 is carbon dioxide pressure break shale overall process characteristics of Acoustic Emission.
Specific embodiment
Below in conjunction with attached drawing, a preferred embodiment of the present invention will be described in detail.
As shown in Figure 1, the device is by constant temperature oil bath, normal triaxial loading system, acoustic emission monitoring system, CO2Pressure break system
System, control system, deformation test system and gas flowmeter composition.
In the present embodiment, shown in carbon dioxide pressure break shale acoustic emission sensor layout drawing 2, in order to reach good reality
Effect is tested, sensor arranges 8 altogether, is evenly arranged 4 acoustic emission sensors, sound emission in shale test specimen top and bottom respectively
Sensor is pasted onto heat-shrinkable tube surface.Shale test specimen (1), pressure break hole (2), acoustic emission sensor (3) in Fig. 2.Acoustic radiating instrument
Port number is 16,18 A/D, and 1kHz-3MHz frequency range, maximum signal amplitudes 100dB, the threshold value of experimental setup is 35-
40dB, sample rate 1MSPS.
In the present embodiment, shown in carbon dioxide pressure break shale experimental result Fig. 3, it can be seen from the figure that shale test specimen
When non-pressure break, shale inside solid generates some macrocracks without macrocrack inside shale after carbon dioxide pressure break, and
Through test specimen；
In the present embodiment, shown in carbon dioxide pressure break shale overall process characteristics of Acoustic Emission Fig. 4, it can be seen from the figure that
Supercritical CO2In pressure break shale overall process, work as supercritical CO2When Fluid pressure is smaller, shale generate acoustic emission signal (amplitude,
Energy, event) it is less, with the increase of pressure, when theoretical value of the pressure close to shale crackle initial cracking pressure, shale has started
It splits, the acoustic emission signal of generation increases, and continues to increase with pressure, and the slowly growing crack in shale extends, and final crackle passes through
Logical pressure break hole and test specimen end face, shale rupture, the acoustic emission signal of generation sharply increase.
Specific step is as follows for experimental method:
Step 1: the shale block that scene is fetched test specimen processing: is made as φ 100mm × 200mm circle in rock sample Processing Room
Cylinder, then in the pressure break hole of test specimen centre drill φ 20mm × 150mm, it is desirable that shale test specimen end face flatness is less than 0.02mm；
Step 2: before non-pressure break, shale test specimen is subjected to CT scan, observes original bedding, the joints characteristics of test specimen；
Step 3: pressure break pipe is put into the pressure break hole of test specimen, and 593 curing agent and epoxy resin are then injected into hole,
Mass ratio is 1:5.45, places 2 days and solidifies, and allows pressure break pipe and pressure break hole tube wall firm pasting, reaches sealing effect.Wherein seal
Section is 80mm, fracturing section 70mm；
Step 4: test specimen is put into triaxial cell, and pressure head is sealed with shale test specimen with heat-shrinkable tube, and electricity consumption, which is blown, to be added
Heat, which is heat-shrinked, allows it to shrink, and high voltage bearing acoustic emission sensor is pasted on heat-shrinkable tube surface, and connect with Acoustic radiating instrument,
Then sealed pressure room, pressure break pressure duct are connect with piston pump, it is desirable that the pressure that pressure duct is born is greater than 50MPa；
Step 5: triaxial cell is put into constant temperature oil bath, and constant temperature oil bath is heated to testing by start-up temperature controller
Temperature, it is desirable that triaxial cell is totally immersed into oil, determines constant temperature effect；
Step 6: opening vacuum pump and vacuumize to shale test specimen, after vacuum degree reaches 8Pa, then starts hydraulic pump to examination
Part adds dead axle pressure and confining pressure；
Step 7: high pressure CH is opened4Gas cylinder (concentration 99.9%) is filled with the CH of certain pressure to shale test specimen upper end4, CH4
By the stratification of shale, joint and hole seepage flow to lower end, to test specimen lower end CH4After stability of flow, recording flowmeter reading, so
The original permeability of shale is calculated afterwards；
Step 8: Acoustic radiating instrument is opened, acoustic emission parameters, the data of required acquisition and figure are set；
Step 9: open twin columns piston pump, to the pressure break hole of shale test specimen upper end inject carbon dioxide, can adopt constant pressure or
Constant current mode injects CO2, while injecting pressurization, automatic collection shale test specimen is axially and transversely deformed, in fracturing process
Characteristics of Acoustic Emission, Three-dimensional damage location data；
Step 10: shale test specimen crushes split after, close twin columns piston pump, open vacuum pump and second is carried out to shale test specimen
It vacuumizes, then repeatedly the 7th step, tests CH after shale test specimen pressure break4Flow, calculate the post-fracturing permeability of shale；
Step 11: after experiment pressure break, opening triaxial cell, take out test specimen, and the destruction for observing shale test specimen is special
Sign, direction, and take pictures, CT scan is then carried out again, analyzes fracture characteristic.
Finally, it is stated that preferred embodiment above is only used to illustrate the technical scheme of the present invention and not to limit it, although logical
It crosses above preferred embodiment the present invention is described in detail, however, those skilled in the art should understand that, can be
Various changes are made to it in form and in details, without departing from claims of the present invention limited range.
Claims (9)
1. a kind of different phase carbon dioxide fracturing shale device, it is characterised in that: the device includes constant temperature oil bath (1), routine
Three axis loading systems (2), acoustic emission monitoring system (9), CO2Frac system (10), control system (7), deformation test system (8)
With gas flowmeter (14)；
The constant temperature oil bath (1) is for controlling experimental temperature；
The normal triaxial loading system (2) is used to load not shale test specimen coaxially pressure and confining pressure；
Characteristics of Acoustic Emission, the three-dimensional of acoustic emission monitoring system (9) the monitoring different phase carbon dioxide fracturing shale overall process
Damage reason location and the critical initial cracking pressure of shale；
The CO2Frac system (10) is used to the inside of shale test specimen inject the CO of different phase2；
The axis pressure and confining pressure of control system (7) control triaxial cell；
The deformation test system (8) is used for the CO of different phase2When pressure break, the deformation of shale test specimen；
The gas flowmeter (14) is for testing CH4Flow.
2. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the constant temperature
Oil bath (1) includes fuel tank and temperature controller (6), for controlling experimental temperature.
3. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the routine
Three axis loading systems include hydraulic pump (2), triaxial cell (3), rack (15) and vacuum pump；
The rack (15) promotes triaxial cell (3) with electronic screw rod, and vacuum pump vacuumizes shale test specimen (5), passes through liquid
Press pump loads not coaxially pressure and confining pressure to shale test specimen (5).
4. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the sound hair
Penetrating monitoring system (9) includes sound emission host, display (12) and acoustic emission sensor (4), for monitoring different phase dioxy
Change characteristics of Acoustic Emission, Three-dimensional damage positioning and the critical initial cracking pressure of shale of carbon fracturing shale overall process；The characteristics of Acoustic Emission
Including amplitude, energy, event and ring.
5. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the CO2Pressure
System (10) is split by twin columns piston pump, CO2And CH4Gas cylinder composition, for the CO to injection different phase inside shale test specimen (5)2
Fracturing shale, twin columns piston pump inject CO using constant pressure or constant current mode2；The different phase includes gaseous state, liquid and super faces
Boundary CO2。
6. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the control
System (7) controls the stabilization axis pressure and confining pressure that hydraulic pump (2) are provided to triaxial cell (3).
7. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the deformation
Test macro (8) is made of axial deformation sensor (11) and transversely deforming sensor, tests the CO of different phase2Fracturing shale
When test specimen deformation.
8. a kind of different phase carbon dioxide fracturing shale device according to claim 1, it is characterised in that: the gas
Flowmeter (14) is used to test the flow of CH4 before and after shale test specimen pressure break, according to the permeability before and after flow rate calculation shale pressure break,
Evaluate CO2Fracturing shale anatonosis effect.
9. the experimental method based on any one of claim 1~8 described device, it is characterised in that: this method includes following step
It is rapid:
Step 1: test specimen processing: being made as φ 100mm × 200mm cylindrical body in rock sample Processing Room for the shale block that scene is fetched,
Then in the pressure break hole of test specimen centre drill φ 20mm × 150mm；
Step 2: the test specimen processed is subjected to CT scan；
Step 3: pressure break pipe is put into the pressure break hole of test specimen, and 593 curing agent and epoxy resin are then injected into hole, solidification
Afterwards, it allows pressure break pipe and pressure break hole tube wall firm pasting, reaches sealing effect；Wherein seal section is 80mm, fracturing section 70mm；
Step 4: test specimen is put into triaxial cell, pressure head is sealed with shale test specimen with heat-shrinkable tube, in heat-shrinkable tube table
Acoustic emission sensor is pasted on face, and is connected with Acoustic radiating instrument, then sealed pressure room, and pressure break pipeline and piston pump connect
It connects；
Step 5: triaxial cell is put into constant temperature oil bath, and start-up temperature controller is heated to experimental temperature；
Step 6: opening vacuum pump and vacuumize to shale test specimen, after reaching vacuum degree, starts hydraulic pump to test specimen and adds a dead axle pressure
And confining pressure；
Step 7: high pressure CH is opened4Gas cylinder is filled with the CH of certain pressure to shale test specimen upper end4, to test specimen lower end CH4Flow is steady
After fixed, recording flowmeter reading calculates the original permeability of shale；
Step 8: Acoustic radiating instrument is opened, acoustic emission parameters, the data of required acquisition and figure are set；
Step 9: opening twin columns piston pump, carbon dioxide is injected to the pressure break hole of shale test specimen upper end, using constant pressure or constant current mould
Formula injects CO2, inject pressurization while, monitoring shale test specimen axially and transversely deform, the characteristics of Acoustic Emission in fracturing process,
Three-dimensional damage location data；
Step 10: shale test specimen crushes split after, repeat the 7th step, test shale test specimen pressure break after CH4Flow, calculate permeability；
Step 11: after experiment pressure break, taking out test specimen, observes destructive characteristics and the direction in pressure break hole, and takes pictures, then again
Carry out secondary CT scan.
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| CN201811467133.4A CN109298162A (en) | 2018-12-03 | 2018-12-03 | Different phase carbon dioxide fracturing shale device and experimental method |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110057740A (en) * | 2019-04-28 | 2019-07-26 | 太原理工大学 | High temperature and pressure coal petrography supercritical carbon dioxide pressure break-creep-seepage tests method |
| CN111426570A (en) * | 2020-05-06 | 2020-07-17 | 西南石油大学 | Two-channel supercritical carbon dioxide fracturing experimental device |
| CN111734376A (en) * | 2020-06-05 | 2020-10-02 | 西安科技大学 | Downhole high pressure liquid CO2Fracturing permeability-increasing coal rock complete equipment design method |
| CN111948056A (en) * | 2019-05-15 | 2020-11-17 | 中国石油天然气股份有限公司 | Large-scale fracturing experiment system and method under different flow state carbon dioxide injection conditions |
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| CN112525944A (en) * | 2020-11-27 | 2021-03-19 | 中国科学院武汉岩土力学研究所 | Multiphase characterization device and method for carbon dioxide micro-displacement |
| CN112525944B (en) * | 2020-11-27 | 2022-05-03 | 中国科学院武汉岩土力学研究所 | Multiphase characterization device and method for carbon dioxide micro-displacement |
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| CN114965079B (en) * | 2022-06-06 | 2024-05-17 | 西安科技大学 | Fracture parameter determination method of coal rock mass type I under supercritical carbon dioxide effect |
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