CN106353197A - High-pressure multiphase-flow coupling rock true-triaxial test system and method - Google Patents
High-pressure multiphase-flow coupling rock true-triaxial test system and method Download PDFInfo
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- CN106353197A CN106353197A CN201610700040.6A CN201610700040A CN106353197A CN 106353197 A CN106353197 A CN 106353197A CN 201610700040 A CN201610700040 A CN 201610700040A CN 106353197 A CN106353197 A CN 106353197A
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- 239000011435 rock Substances 0.000 title claims abstract description 95
- 238000012360 testing method Methods 0.000 title claims abstract description 32
- 230000008878 coupling Effects 0.000 title claims abstract description 16
- 238000010168 coupling process Methods 0.000 title claims abstract description 16
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title abstract description 16
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 74
- 239000012530 fluid Substances 0.000 claims abstract description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 238000006073 displacement reaction Methods 0.000 claims abstract description 42
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 37
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 36
- 239000011148 porous material Substances 0.000 claims abstract description 34
- 238000007789 sealing Methods 0.000 claims abstract description 23
- 238000012545 processing Methods 0.000 claims abstract description 3
- 239000007789 gas Substances 0.000 claims description 18
- 230000004888 barrier function Effects 0.000 claims description 13
- 239000003643 water by type Substances 0.000 claims description 11
- 230000008859 change Effects 0.000 claims description 8
- 238000012544 monitoring process Methods 0.000 claims description 4
- 239000000565 sealant Substances 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 238000007596 consolidation process Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 238000004140 cleaning Methods 0.000 claims description 2
- 230000007423 decrease Effects 0.000 claims description 2
- 238000011067 equilibration Methods 0.000 claims description 2
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- 238000010998 test method Methods 0.000 claims description 2
- 229910052573 porcelain Inorganic materials 0.000 claims 1
- 230000007246 mechanism Effects 0.000 abstract description 5
- VUZPPFZMUPKLLV-UHFFFAOYSA-N methane;hydrate Chemical compound C.O VUZPPFZMUPKLLV-UHFFFAOYSA-N 0.000 abstract description 4
- 238000005086 pumping Methods 0.000 abstract description 2
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- 235000012431 wafers Nutrition 0.000 description 11
- 238000005259 measurement Methods 0.000 description 8
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- 239000003921 oil Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
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- 230000005514 two-phase flow Effects 0.000 description 2
- 102000010637 Aquaporins Human genes 0.000 description 1
- 108010063290 Aquaporins Proteins 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 241000790917 Dioxys <bee> Species 0.000 description 1
- 238000003556 assay Methods 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- HPNSNYBUADCFDR-UHFFFAOYSA-N chromafenozide Chemical compound CC1=CC(C)=CC(C(=O)N(NC(=O)C=2C(=C3CCCOC3=CC=2)C)C(C)(C)C)=C1 HPNSNYBUADCFDR-UHFFFAOYSA-N 0.000 description 1
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Classifications
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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
-
- G—PHYSICS
- G01—MEASURING; TESTING
- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/14—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object using acoustic emission techniques
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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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- 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
- G01N2203/003—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
- G01N2203/0069—Fatigue, creep, strain-stress relations or elastic constants
- G01N2203/0075—Strain-stress relations or elastic constants
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- Analytical Chemistry (AREA)
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- Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Acoustics & Sound (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a high-pressure multiphase-flow coupling rock true-triaxial test system and method and relates to a rock mechanic test technique. The system is established by arranging a rock sample in a center of a pressure confining chamber, arranging load cushion blocks around the rock sample, enabling a pressing shaft in an X direction to tightly press left and right load cushion blocks, and enabling a pressing shaft in a Y direction to tightly press front and rear load cushion blocks; respectively connecting a pore carbon dioxide metering pump and a pore water metering pump to a computer through controllers to realize fluid control; respectively connecting an acoustic emission sensor and an LVDT displacement sensor to the computer to acquire acoustic emission signals and displacement signals. The method comprises the following steps of: 1) rock sampling processing; 2)rock sample sealing; 3) pipeline connection; 4) system airtightness check; 5) vacuum pumping; 6) prestress loading; 7) pore fluid loading; 8) testing; 9) equipment tidying; 10) test data organization. The system can acquire mechanical and deformation parameters of rock under a high-pressure carbon dioxide and water coupled condition, so as to carry out studies on mechanical properties, deformation mechanisms and the like of rock under the high-pressure carbon dioxide and water coupled condition.
Description
Technical field
The present invention relates to rock mechanics experiment technology, more particularly, to a kind of high pressure multiphase flow coupling rock true triaxial test system
System and method.
Background technology
A large amount of discharges of greenhouse gases are one of principal elements of impact global warming.co2Trap, seal up for safekeeping and utilize
Technology has become as and reduces one of key technology of CO2 emissions in the world.Underground deep salt water layer, petroleum resources are opened
Adopt the places such as discarded field with "nine squares", deep-sea and unconventionaloil pool reservoir (the unconventional resource such as shale oil gas, coal bed gas and densification oil)
As carbon dioxide sequestration main place.In co2It is must not to place mechanical stability A+E in geological storage project
The link that can lack.co2Geological storage (ccs), unconventional petroleum resources exploitation and the underground engineering such as carbon dioxide drilling well and pressure break
All refer to the interaction of rock, water and carbon dioxide.In recent years, multiple two phase flow Coupling with Mechanics analysis softwares are arisen at the historic moment,
But due to lacking experiment basis and the constitutive model of the lower rock mechanics of the two-phase fluid of water containing co2- effect, numerical simulation result
Still engineering demand can not be met.In order to improve numerical analysis with computational accuracy it is necessary to simulate stress and the sky of deep reservoir
Gap fluid state, carries out carbon dioxide and the consolidation draining true triaxial mechanical test of the lower sandstone of water two phase flow effect, tests and divide
The mechanical characteristic of rock under analysis different fluid component and pressure, and probe into the mechanical characteristic of rock under high pressure multiphase flow coupling
The assay method of relevant parameter, is the foundation of numerical simulation mechanic constitutive model and the mensure of related mechanics parameter lays the foundation.
Additionally, being directed to co2Test deficient, co relative with theoretical research with the relevant rudimentary of rock mechanics under the conditions of water two phase flow2With
The criterion of strength of the lower rock of water coincidence effect, micromechanism of damage and constitutive equation are that have key scientific problems to be solved.
Content of the invention
It is an object of the invention to realizing rock mechanics experiment test under high-pressure fluid multiphase porous flow coupling, fully examine
Consider the impact to rock mechanics for the high-pressure fluid, provide a kind of high pressure multiphase porous flow coupling rock true triaxial test system and its
Method, can study the criterion of strength of the lower rock of the high pressure fluid coupling such as co2, n2, methane and water effect, cracks can spread is damaged and drilled
Change mechanism and constitutive relation etc., be scale co2 geological storage mechanical stability risk assessment set up effective theoretical model and
Method for numerical simulation lays the foundation.
The object of the present invention is achieved like this:
First, high pressure multiphase flow coupling rock true triaxial test system (abbreviation system)
Including pressure indoor, x direction last item, y direction last item, load cushion block, porous barrier, pcmax ceramic wafer, o type sealing ring, rock
Sample, acoustic emission sensor, computer, temperature adjustment waters, filter, hole carbon dioxide metering pump, pore water dosing pump, true
Empty pump, controller, displacement support and lvdt displacement transducer；
Its position and annexation are:
Be provided centrally with rock sample in pressure indoor, the surrounding of rock sample be provided with loading cushion block, x direction last item compression left and right plus
Carry cushion block, y direction last item compresses forward and backward loading cushion block；Left, front loading cushion block is provided with displacement support, loads right, rear
Lvdt displacement transducer is provided with cushion block；Left and right loading cushion block is provided with fluid passage；It is provided with left loading cushion block
Pcmax ceramic wafer, and sealed by type sealing ring；Left and right loading cushion block is embedded with porous barrier；In rear loading pad
Acoustic emission sensor is provided with block；
Upper and lower surface daub sealing by rock sample；Left and right loading cushion block is connected with filter by gas piping；
Filter measures pump with hole carbon dioxide respectively and pore water dosing pump is connected, and hole carbon dioxide measures pump and hole
Water dosing pump is commonly connected to vacuum pump, by rock sample evacuation；Hole carbon dioxide metering pump and pore water dosing pump lead to respectively
Cross controller and computer connects, realize fluid control；
Acoustic emission sensor and lvdt displacement transducer are connected with computer respectively, gather acoustic emission acoustical signal and displacement signal.
2nd, high pressure multiphase flow coupling rock true triaxial test method (abbreviation method)
This method mainly comprises the steps that
1. rock sample processing
Rock to be tested is processed as length × width × height=100mm × 50mm × 50mm or 80mm × 40mm × 40mm surfacing
Cube rock sample；
2. rock sample sealing
Rock sample is placed on left and right, front and rear loading cushion block center and clamps, equably smear in rock sample upper and lower surface and edges and corners
One layer of fluid sealant, so that fluid sealant and the fully wrapped around firmly rock sample of loading cushion block, forms molectron；Glue to be sealed air-dries, and just can enter
Row test；
3. pipeline connects
Molectron containing rock sample is put into pressure indoor centre position, and x direction last item and y direction last item are compressed loading pad
Block；Then the carbon dioxide loading on cushion block and hole water lines are measured pump and pore water metering respectively with hole carbon dioxide
Pump connects, and pipeline needs approach temperature adjustment waters；
4. system airtight test
In pore-fluid control unit, the rock sample to sealing is filled with high-pressure gas, after pressure is constant, closes valve, sees
Examine pressure change, such as do not decline after interior for a long time, then air-tightness is good；Otherwise repeat to seal sample and step 3. 4., until
Till this unit sealing is good；
5. evacuation
Open vacuum pump, evacuation 12 hours, after the completion of first close gas circuit valve and turn off vacuum pump, keep inside sealing rock sample
Vacuum state；
6. prestressing force loads
Start triaxial pressure machine loading system, according to pre-trial scheme, predetermined triaxial stress is applied to rock sample；
7. pore-fluid loads
Start hole anchracometer amount pump and pore water dosing pump, temperature adjustment waters, first inject high pressure pore water, and keep
Predetermined pressure；After consolidation balance, inject high pressure hole carbon dioxide, and keep predetermined pressure, consolidate equilibration time
Keep 24 hours；
8. experimental test
Start acoustic emission monitor and displacement monitoring unit first, further according to pre-set stress path, control and adjust
Section triaxial pressure machine and pore fluid pressure, carry out the multiphase flow coupling true three kinds of dynamic characteristic tests of rock；
9. collator
After test to be done, first gases at high pressure are released, then unload stress, the rock sample being destroyed after taking out test, cleaning is dry
Net pressure indoor, closes triaxial pressure machine, acoustic emission monitor and pore-fluid control unit；
10. test data arranges
The experimental test data preserving in a computer is arranged and is analyzed.
The present invention has following advantages and a good effect:
1. being precisely controlled of stress and displacement can be realized using SERVO CONTROL true triaxial stress system；
2. using fluid metering pump enabled under complex stress condition the precise control of fluid pressure and rock sample saturation and
Measurement, and the parameters such as the transient state quality of fluid, flow can be accurately measured；
3. the loading cushion block based on axial translation technology particular design can apply multiple fluid to rock sample, realizes heterogeneous fluid coupling
Simulated environment, and it can be deployed in the high breathable membrane that fine and close homogenizing rock makes can form more than 10mpa obtains matric suction；
4. can be simulated true residing for deep reservoir rock mass using true triaxial Stress Control system and pore-fluid control system
Real stress and pore-fluid state；
5. the deformation of sample can be accurately measured using the lvdt displacement transducer loading on cushion block；
6. acoustic emission sensor can receive the destruction signal of pore media cranny development and extension generation in adding uninstall process,
Realize multiphase porous media stress, damage and seepage flow close coupling research；
7. the system can obtain mechanical characteristic under the conditions of high-pressure carbon dioxide and water coincidence for the rock and deformation mechanism research.
In a word, the present invention can study deep mining and the multiphase coupled rock mass of high pressure of buried Geological Engineering institute facing
Deformation fracture mechanism and the fracture geological disaster mechanism such as slip Tectonic earthquake, and be Optimum design of engineering structure and safe operation carries
For crucial experiment and theory support.
Brief description
Fig. 1 is the structural representation (overlooking, cut open) of the system；
Fig. 2 is loading cushion block generalized section on the system x direction；
Fig. 3 .1 is left (right) front view loading cushion block,
Fig. 3 .2 is left (right) top view loading cushion block,
Fig. 3 .3 is left (right) left view loading cushion block；
Fig. 4 .1 is the front view of porous barrier,
Fig. 4 .2 is the top view of porous barrier,
Fig. 4 .3 is the left view of porous barrier.
In figure:
1 pressure indoor；
2 x direction last items；
3 y direction last items；
4 loading cushion blocks,
4-1 left loading cushion block, 4-2 right loading cushion block, load cushion block before 4-3, after 4-4, load cushion block；
5 porous barriers；
6 pcmax ceramic wafers；
7 o type sealing rings；
8 rock samples；
9 acoustic emission sensors；
10 computers；
11 temperature adjustment waters；
12 filters；
13 hole carbon dioxide metering pumps；
14 pore water dosing pumps；
15 vacuum pumps；
16 controllers；
17 displacement supports；
18 lvdt displacement transducers.
Specific embodiment
Describe in detail with reference to the accompanying drawings and examples:
First, system
1st, overall
As Fig. 1,2, the system include pressure indoor 1, x direction last item 2, y direction last item 3, load cushion block 4, porous barrier 5, pcmax
Ceramic wafer 6, o type sealing ring 7, rock sample 8, acoustic emission sensor 9, computer 10, temperature adjustment waters 11, filter 12, hole
Carbon dioxide metering pump 13, pore water dosing pump 14, vacuum pump 15, controller 16, displacement support 17 and lvdt displacement transducer
18；
Its position and annexation are:
Be provided centrally with rock sample 8 in pressure indoor 1, the surrounding of rock sample 8 be provided with loading cushion block 4, x direction last item 2 compress a left side,
Right loading cushion block 4-1,4-2, y direction last item 3 compresses forward and backward loading cushion block 4-3,4-4；Load on cushion block 4-1,4-3 left, front
It is provided with displacement support 17, be provided with lvdt displacement transducer 18 in right, rear loading on cushion block 4-2,4-4；Left and right loading cushion block
4-1,4-2 are provided with fluid passage；It is provided with pcmax ceramic wafer 6 in left loading cushion block 4-1, and pass through o type sealing ring 7
Sealed；It is embedded with porous barrier 5 in left and right loading on cushion block 4-1,4-2；Rear loading cushion block 4-4 arranges sound
Penetrate sensor 9；
Upper and lower surface daub sealing by rock sample 8；Left and right loading cushion block (4-1,4-2) passes through gas piping and filter 12 phase
Even；
Filter 12 measures pump 13 with hole carbon dioxide respectively and pore water dosing pump 14 is connected, and hole carbon dioxide measures pump
13 and pore water dosing pump 14 be commonly connected to vacuum pump 15, by rock sample 8 evacuation；Hole carbon dioxide metering pump 13 and hole
Water dosing pump 14 passes through controller 16 respectively and computer 10 connects, and realizes fluid control；
Acoustic emission sensor 9 and lvdt displacement transducer 18 are connected with computer 10 respectively, gather acoustic emission acoustical signal and displacement
Signal.
2nd, functional part
1) pressure indoor 1
Pressure indoor 1 is a kind of airtight circular cylindrical chamber of lid on stainless steel band；
Its function is: indoor uniform the answering that can produce the maximum confined pressure of 100mpa full of hydraulic oil, be rock sample 8 applying z direction
Power, and gas is set and electric wiring wears a layer passage.
2) x direction last item 2
X direction last item 2 is a kind of stainless steel cylinder；
Its function is: the x directional pressure that transmission triaxial pressure machine produces, triaxial pressure machine is in x direction maximum load ability 500t.
3) y direction last item 3
Y direction last item 3 is a kind of stainless steel cylinder；
Its function is: the y directional pressure that transmission triaxial pressure machine produces, triaxial pressure machine is in y direction maximum load ability 250t.
4) load cushion block 4
Loading cushion block 4 is a kind of stainless steel rectangular blocks, loads cushion block 4-1,4-2,4-3,4-4 including left, right, front and rear；
Its left and right cushion block 4-1,4-2 of loading respectively is provided with fluid passage, and the fluid passage of left loading cushion block 4-1 needs to fill
, as aquaporin, the fluid passage of right loading cushion block 4-2 is as gas passage for pcmax ceramic wafer 6.
5) porous barrier 5
Porous barrier 5 is a kind of corrosion resistant plate with porous, and its shape and loading cushion block 4 are adapted to；
Its function is: in embedded loading cushion block 4, transmission stress simultaneously can enable flow through.
6) pcmax ceramic wafer 6
Pcmax ceramic wafer 6 is the ceramic wafer (or fine and close homogenizing rock) of a kind of high-gas resistance value and high pressure；
Its function is can be with permeable trapping, and maximum can stop and reaches 10mpa gases at high pressure, can effectively adjustment apertures water and hole dioxy
Change the component pressure of the gases such as carbon.
7) o type sealing ring 7
O type sealing ring is a kind of o type rubber ring；
Its function is: the junction of different parts is sealed.
8) rock sample 8
Rock sample 8 is object to be tested.
9) acoustic emission sensor 9
Acoustic emission sensor 9 is a kind of sensor of collection acoustical signal；
Its function is: the acoustie emission event number in collection rock failure process.
10) computer 10
Computer 10 is a kind of general computer；
Its function is: flow pump is controlled and carries out data acquisition to acoustic emission sensor, displacement transducer.
11) temperature adjustment waters 11
Temperature adjustment waters 11 is a kind of general constant temperature water bath；
Its function is: makes the fluid of inflow rock sample be maintained at predetermined temperature, realizes the thermostatic control of fluid.
12) filter 12
Filter 12 be a kind of general can be with the device of the solid particle of particle diameter certain in filtered fluid；
Its function is: impurity in filtered fluid, prevents pipeline to be blocked.
13) hole carbon dioxide metering pump 13
Hole carbon dioxide measures the d series 100dx dosing pump that pump 13 adopts teledyne isco company；
Its function is: the pressure of precise control carbon dioxide, and the parameter such as the transient state quality of accurate measurement carbon dioxide and flow,
And there are constant voltage and two kinds of mode of operations of constant current, constant voltage mode of operation scalable pressure limit is 0.06895～68.95mpa, pressure
Power display resolution is 6.895kpa.
14) pore water dosing pump 14
Pore water dosing pump 14 adopts the d series 100dx dosing pump of teledyne isco company；
Its function is: the pressure of precise control water, and the parameter such as the transient state quality of measure water and flow, and have constant voltage and
Two kinds of mode of operations of constant current, constant voltage mode of operation scalable pressure limit is 0.06895～68.95mpa, pressure display resolution
For 6.895kpa.
15) vacuum pump 15
Vacuum pump 15 is a kind of general vaccum-pumping equipment；
Its function is: can extract the gas in rock sample out, and be allowed to be in high negative pressure state.
16) controller 16
Controller 16 is a kind of supporting controller of series 100dx dosing pump of the d with teledyne isco company, can complete
Computer to dosing pump real-time control order and by information real-time Transmission to computer electronic equipment；
Its function is: hole carbon dioxide is measured pump 13 and pore water dosing pump 14 flow parameter Real-time Feedback to computer 10
And the order of execution computer 10 is controlled to hole anchracometer amount pump 13 and pore water dosing pump 14.
17) displacement support 17
Displacement support 17 is that a kind of stainless steel is fixed on the foot rest loading on cushion block 4；
Its function is: fixing lvdt displacement transducer 18, and can by the change in size of rock sample 8 be converted between displacement support 17 away from
From change.
18) lvdt displacement transducer 18.
Lvdt displacement transducer 18 is a kind of conventional high accuracy displacement sensor；
Its function is: the distance between displacement support 17 can be converted into the signal of telecommunication, process through computer 10 and be reduced into displacement, can
Size distortion with real-time monitoring rock sample 8.
3rd, the operation principle of the system
The system is by triaxial stress control unit, pore-fluid control unit, deformation measurement unit harmony emission measurement unit 4
Divide and constitute；The system can independent precise control three-dimensional axial stress, co2 fluid pore pressure, pore water pressure, and accurate measurement
The parameter such as the transient state quality of co2 and water and flow.
1) triaxial stress control unit
The triaxial stress control unit being made up of pressure indoor 1, x direction last item 2, y direction last item 3 and triaxial pressure machine, is system
There is provided stress to support, complete the mechanical characteristic sample of rock sample 8；
Triaxial stress control unit produces, by triaxial pressure machine, last item and the loading that huge stress passes through two horizontal directions of x, y
Cushion block applies to rock sample 8, and oil pressure pump passes through to inject, to pressure indoor, the stress that hydraulic oil applies z direction to rock sample 8；Three directions
Stress with independent loads and SERVO CONTROL (displacement control mode and force control mode), y directional pressure maximum load ability can be
250t, x direction maximum load ability 500t, z direction maximum load ability is 100mpa；Can to length × width × height=100mm ×
The square rock sample 8 of two kinds of 50mm × 50mm or 80mm × 40mm × 40mm is loaded.
2) pore-fluid control unit
By loading cushion block 4, porous barrier 5, pcmax ceramic wafer 6, o type sealing ring 7, temperature adjustment waters 11, filter 12, hole
Gap carbon dioxide measures pump 13, the pore-fluid control unit of pore water dosing pump 14, vacuum pump 15 and controller 16 composition, is
Rock sample 8 provides the simulated environment of high pressure heterogeneous fluid, and multiple fluid parameters can be controlled and measure；
Pore-fluid control unit measures pump 13 by hole carbon dioxide and pore water dosing pump 14 passes through to load the fluid of cushion block 4
Passage, to rock sample 8 injecting carbon dioxide and water or other fluid, realizes the simulated environment of the high-pressure fluid of rock sample 8；Hole carbon dioxide
Dosing pump 13 and pore water dosing pump 14, and can be accurately all using the d series 100dx dosing pump of teledyne isco company
Control Fluid pressure and flow；The pcmax dividing plate embedding in left loading cushion block 4-1 be high-gas resistance value and high pressure ceramic wafer or
Tight rock (has stable breakthrough pressure), translates suction control technique by axle and can effectively adjust and control co2 and water
Pore pressure, can prevent from sealing in pore water dosing pump 14 far above the carbon dioxide of interstitial hydraulic pressure value and realize different pressures
The fluid injection of force value.
3) deformation measurement unit
Deformation measurement unit is formed by displacement support 17, lvdt displacement transducer 18 and computer 10, rock sample 8 can be monitored in examination
The deformation in x, y direction during testing；
Deformation measurement unit is monitored the distance change of the displacement support 17 of two relative positions by lvdt displacement transducer 18, indirectly
The change in size situation of ground monitoring rock sample 8；Lvdt displacement transducer 18 range 0-5mm, pressure 120mpa, can meet high confining pressure
The working condition of environment.
4) acoustic emission measuring unit
The sound in rock failure process can be monitored by the acoustic emission measuring unit that acoustic emission sensor 9 and computer 10 form to send out
Penetrate event number, the relation of research characteristic stress and strain.
Acoustic emission measuring unit by the acoustie emission event number in acoustic emission monitor(ing) rock failure process, by 10 points of computer
Analysis acoustic emission time number can obtain feature stresses and the relation of strain.
Claims (2)
1. a kind of high pressure multiphase flow coupling rock true triaxial test system it is characterised in that:
Including pressure indoor (1), x direction last item (2), y direction last item (3), load cushion block (4), porous barrier (5), pcmax pottery
Plate (6), o type sealing ring (7), rock sample (8), acoustic emission sensor (9), computer (10), temperature adjustment waters (11), filter
(12), hole carbon dioxide metering pump (13), pore water dosing pump (14), vacuum pump (15), controller (16), displacement support
And lvdt displacement transducer (18) (17)；
Its position and annexation are:
It is provided centrally with rock sample (8) in pressure indoor (1), the surrounding of rock sample (8) is provided with loading cushion block (4), x direction last item
(2) compression left and right loading cushion block (4-1,4-2), y direction last item (3) compression forward and backward loading cushion block (4-3,4-4)；Left, front
Load and displacement support (17) is provided with cushion block (4-1,4-3) and in the right side, the afterwards upper lvdt displacement sensing of loading cushion block (4-2,4-4)
Device 18；Left and right loading cushion block (4-1,4-2) is provided with fluid passage；It is provided with pcmax pottery in left loading cushion block (4-1)
Porcelain plate (6), and sealed by o type sealing ring (7)；Left and right loading cushion block (4-1,4-2) is embedded with porous barrier
(5)；Rear loading cushion block (4-4) is provided with acoustic emission sensor (9)；
Upper and lower surface daub sealing by rock sample (8)；Left and right loading cushion block (4-1,4-2) passes through gas piping and filter
(12) it is connected；
Filter (12) is connected with hole carbon dioxide metering pump (13) and pore water dosing pump (14) respectively, hole carbon dioxide
Dosing pump (13) and pore water dosing pump (14) are commonly connected to vacuum pump (15), by rock sample 8 evacuation；Hole anchracometer
Amount pump (13) and pore water dosing pump (14) pass through controller (16) and computer (10) connection respectively, realize the control of convection cell
System；
Acoustic emission sensor (9) and lvdt displacement transducer (18) are connected with computer (10) respectively, gather acoustic emission acoustical signal
And displacement signal.
2. based on described in claim 1 high pressure multiphase flow couple rock true triaxial test system test method it is characterised in that
Comprise the following steps:
1. rock sample processing
Rock to be tested is processed as length × width × height=100mm × 50mm × 50mm or 80mm × 40mm × 40mm surfacing
Cube rock sample；
2. rock sample sealing
Rock sample is placed on left and right, front and rear loading cushion block center and clamps, equably smear in rock sample upper and lower surface and edges and corners
One layer of fluid sealant, so that fluid sealant and the fully wrapped around firmly rock sample of loading cushion block, forms molectron；Glue to be sealed air-dries, and just can enter
Row test；
3. pipeline connects
Molectron containing rock sample is put into pressure indoor centre position, and x direction last item and y direction last item are compressed loading pad
Block；Then the carbon dioxide loading on cushion block and hole water lines are measured pump and pore water metering respectively with hole carbon dioxide
Pump connects, and pipeline needs approach temperature adjustment waters；
4. system airtight test
In pore-fluid control unit, the rock sample to sealing is filled with high-pressure gas, after pressure is constant, closes valve, sees
Examine pressure change, such as do not decline after interior for a long time, then air-tightness is good；Otherwise repeat to seal sample and step 3. 4., until
Till this unit sealing is good；
5. evacuation
Open vacuum pump, evacuation 12 hours, after the completion of first close gas circuit valve and turn off vacuum pump, keep inside sealing rock sample
Vacuum state；
6. prestressing force loads
Start triaxial pressure machine loading system, according to pre-trial scheme, predetermined triaxial stress is applied to rock sample；
7. pore-fluid loads
Start hole anchracometer amount pump and pore water dosing pump, temperature adjustment waters, first inject high pressure pore water, and keep
Predetermined pressure；After consolidation balance, inject high pressure hole carbon dioxide, and keep predetermined pressure, consolidate equilibration time
Keep 24 hours；
8. experimental test
Start acoustic emission monitor and displacement monitoring unit first, further according to pre-set stress path, control and adjust
Section triaxial pressure machine and pore fluid pressure, carry out the multiphase flow coupling true three kinds of dynamic characteristic tests of rock；
9. collator
After test to be done, first gases at high pressure are released, then unload stress, the rock sample being destroyed after taking out test, cleaning is dry
Net pressure indoor, closes triaxial pressure machine, acoustic emission monitor and pore-fluid control unit；
10. test data arranges
The experimental test data preserving in a computer is arranged and is analyzed.
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