CN110487697A - Infuse supercritical carbon dioxide coal petrography mechanical property testing and fracturing experiments device - Google Patents
Infuse supercritical carbon dioxide coal petrography mechanical property testing and fracturing experiments device Download PDFInfo
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- CN110487697A CN110487697A CN201910690960.8A CN201910690960A CN110487697A CN 110487697 A CN110487697 A CN 110487697A CN 201910690960 A CN201910690960 A CN 201910690960A CN 110487697 A CN110487697 A CN 110487697A
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- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 title claims abstract description 43
- 238000002474 experimental method Methods 0.000 title claims abstract description 32
- 238000012360 testing method Methods 0.000 title claims abstract description 27
- 239000003245 coal Substances 0.000 title claims abstract description 26
- 229910002092 carbon dioxide Inorganic materials 0.000 title claims abstract description 24
- 239000001569 carbon dioxide Substances 0.000 title claims abstract description 21
- 239000011148 porous material Substances 0.000 claims abstract description 49
- 239000006101 laboratory sample Substances 0.000 claims abstract description 38
- 239000011435 rock Substances 0.000 claims abstract description 35
- 238000012545 processing Methods 0.000 claims abstract description 11
- 238000012544 monitoring process Methods 0.000 claims abstract description 8
- 238000007789 sealing Methods 0.000 claims description 64
- 239000000523 sample Substances 0.000 claims description 43
- 238000011144 upstream manufacturing Methods 0.000 claims description 25
- 238000000034 method Methods 0.000 claims description 24
- 238000006073 displacement reaction Methods 0.000 claims description 20
- 230000035699 permeability Effects 0.000 claims description 19
- 239000007788 liquid Substances 0.000 claims description 18
- 230000035882 stress Effects 0.000 claims description 10
- 238000002347 injection Methods 0.000 claims description 9
- 239000007924 injection Substances 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 8
- 230000001052 transient effect Effects 0.000 claims description 8
- 239000000969 carrier Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 238000005086 pumping Methods 0.000 claims description 4
- 238000001125 extrusion Methods 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- 230000002123 temporal effect Effects 0.000 claims description 3
- 230000001550 time effect Effects 0.000 claims description 3
- 230000007704 transition Effects 0.000 claims description 3
- 230000006355 external stress Effects 0.000 claims description 2
- 238000007689 inspection Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 3
- 230000001360 synchronised effect Effects 0.000 abstract description 3
- 239000007789 gas Substances 0.000 description 20
- 229960004424 carbon dioxide Drugs 0.000 description 19
- 239000012530 fluid Substances 0.000 description 13
- 238000013461 design Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 230000001808 coupling effect Effects 0.000 description 3
- 238000011160 research Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000003208 petroleum Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 229910002090 carbon oxide Inorganic materials 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 230000010534 mechanism of action Effects 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 210000002569 neuron Anatomy 0.000 description 1
- 230000009919 sequestration Effects 0.000 description 1
- 230000000638 stimulation Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
Classifications
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- 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
- 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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- Chemical & Material Sciences (AREA)
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- Analytical Chemistry (AREA)
- Dispersion Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Fluid Mechanics (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The present invention relates to multiple physical fields to couple rock mechanics the field of test technology under environment, a kind of note supercritical carbon dioxide coal petrography mechanical property testing and fracturing experiments device are provided, including confining pressure system, axis press system, Pore Pressure system, temperature control system, data collecting and processing system；Confining pressure system, axis pressure system and Pore Pressure system can provide confining pressure, axis pressure and Pore Pressure simultaneously for laboratory sample respectively；Temperature control system provides temperature control for laboratory sample；Data collecting and processing system is acquired and handles to confining pressure system, axis pressure system, the real time data of Pore Pressure system.The present invention has showed under heat flow piercement environment, and axis presses system, confining pressure system, the organic assembling of Pore Pressure system and temperature control system, implements to realize the synchronous of the various loading capacities of experimentation, the real-time synchronization monitoring of monitoring quantity；It is structurally reasonable, there is broad prospect of application.
Description
Technical field
The present invention relates to multiple physical fields to couple rock mechanics the field of test technology under environment, in particular to a kind of note is super
Critical carbon dioxide coal petrography mechanical property testing and fracturing experiments device.
Background technique
In coal bed gas, shale gas, tight gas and petroleum reservoir fracturing yield increasing development process and carbon dioxide geologic sequestration
Coal petrography mechanical response problem under temperature field, fluid neuron network field and stress field coupling is all referred in engineering.In recent years, international
The research institutions of upper many country and scholar start using supercritical carbon dioxide as pressure break medium progress petroleum, natural gas and non-
The fracture stimulation operations of conventional gas.Further investigate the phase under heat flow piercement environment between coal petrography and supercritical carbon dioxide
Interaction, research note supercritical carbon dioxide process coal petrography resultant stress-strain-permeability-acoustic emission response curve, to further
Understand coal petrography and the supercritical carbon dioxide mechanism of action and pushes China in the technology in supercritical carbon dioxide pressure break coal petrography field
Progress has important scientific meaning.However, existing triaxial tests machine can only meet permeability test or heat under the conditions of flowing admittedly
Stress-strain test under the conditions of fluid structurecoupling, not yet by temperature control system, confining pressure system, axis pressure system and Pore Pressure
System is organically combined, it is difficult to meet resultant stress-strain-permeability-sound emission under the heat flow piercement environment of laboratory
The needs of conditional curve research.
Summary of the invention
The object of the invention is to overcome the deficiencies of the prior art and provide a kind of note supercritical carbon dioxide coal petrography mechanics
Characteristic test and fracturing experiments device press system and Pore Pressure system by control temperature control system, confining pressure system, axis,
It is in coal petrography (experiment sample) in the heat flow piercement environment of setting；Then, upstream and downstream in the test of Transient Method permeability is utilized
The permeability test based on Transient Method is realized in two air pump pressure settings；And it is acquired by displacement sensor (LVDT) and sound emission
Device real-time synchronization monitors the deformation and acoustie emission event of coal petrography in experimentation；To further investigation and understand heat flow piercement
The multi-field coupling effects and interaction mechanism of effect bet supercritical carbon dioxide coal petrography.
The present invention adopts the following technical scheme:
A kind of note supercritical carbon dioxide coal petrography mechanical property testing and fracturing experiments device, including confining pressure system, axis pressure
System, Pore Pressure system, temperature control system, data collecting and processing system；
The confining pressure system, axis pressure system and Pore Pressure system can simultaneously for laboratory sample provide respectively confining pressure, axis pressure and
Pore Pressure；The temperature control system provides temperature control for laboratory sample；The data collecting and processing system to confining pressure system,
Axis pressure system, the real time data of Pore Pressure system are acquired and handle.
Further, the confining pressure system includes outer tube, interior flexible pipe, confining pressure control pressure pump and confined pressure control valve door；
The interior flexible pipe is fixed in outer lumen body, and the outer tube cavity is full of the first liquid；The confining pressure control
Pressing pressure pump is connect by the confined pressure control valve door with the cavity of the outer tube；Laboratory sample is placed in the interior flexible pipe
Portion；The confining pressure control pressure pump controls the pressure of the first liquid in the outer lumen body, and the pressure of first liquid passes through
The interior flexible pipe passes to laboratory sample, forms the confining pressure of laboratory sample.
Further, the fixed form of the outer tube and interior flexible pipe are as follows: the both ends of the outer tube are respectively provided with counter-force pedestal,
The counter-force whorl of base is connected to the end of the outer tube, and clamper is threadedly connected to the counter-force pedestal, the interior flexibility
2 ends of pipe are socketed on 2 clampers respectively.
Further, the axis pressure system includes the first sealing clamp, the second sealing clamp, axial compressive force control pump, axis
To pressure control valve；
First sealing clamp, the second sealing clamp are all set in the interior flexible pipe, first sealing clamp,
The confined space that second sealing clamp and interior flexible pipe are collectively formed is for placing laboratory sample；First sealing clamp and folder
Holder is fixedly connected, and second sealing clamp can slide in the interior flexible pipe；
Confined space between second sealing clamp, interior flexible pipe and clamper forms axis and presses chamber, and the axis pressure is intracavitary to fill
Full second liquid, the axial compressive force control pump press chamber to connect by the axial compressive force control valve with the axis；The axis
The pressure that the axis presses intracavitary second liquid is controlled to pressure control pump, second sealing clamp is in the second liquid pressure
It under driving, is slided in the interior flexible pipe, extrusion experiment sample, provides axis pressure for laboratory sample.
Further, the Pore Pressure system includes gas source, upstream pressure pump, downstream pressure pump, pore pressure control pump；
Through-hole is provided on first sealing clamp, the second sealing clamp；The upstream pressure pump is by being set to
Through-hole on first sealing clamp applies upstream pressure to laboratory sample, and the downstream pressure pump is by being set to the second sealing pressure
Through-hole applies downstream pressure to laboratory sample on plate；
The gas source and pore pressure control pump connection, and the pore pressure control pump pumps respectively with upstream pressure and downstream
Pressure pump connection.
Further, the temperature control system includes temperature-controlled cabinet, heating device, temperature sensor, support carriers；
The outer tube, interior flexible pipe and laboratory sample are arranged in the temperature-controlled cabinet, the temperature-controlled cabinet
Heating device is set on inner wall and temperature sensor, the support carriers are used to support the outer tube.
Further, the data collecting and processing system includes the temperature sensor, displacement sensor, sound emission acquisition
Device, computer；
The displacement on second sealing clamp, for measurement experiment sample is arranged in institute's displacement sensors；
The sound emission acquisition device includes acoustic emission probe and sound emission Acquisition Instrument；Acoustic emission probe setting is the
On one sealing clamp and/or the second sealing clamp, the acoustic emission probe is connected to sound emission Acquisition Instrument by data line；
The computer is connect with the temperature sensor, displacement sensor, sound emission Acquisition Instrument respectively；
The computer acquires the confining pressure of laboratory sample, axis pressure and Pore Pressure simultaneously.
Further, first sealing clamp, the second sealing clamp are O-shaped or double O-shaped.O-shaped sealing clamp structure
Design designed primarily directed to the biggish fracturing fluid of the viscositys such as water, fracturing fluid can be effectively prevented and overflowed etc.；It is double O-shaped
The design of sealing clamp structure is designed primarily directed to the lesser fracturing fluid of the viscositys such as carbon dioxide and supercritical carbon dioxide,
Realize the sealing function of fracturing process fracturing fluid.
Further, the experimental provision further includes vacuum evacuation device, and the vacuum means are set to laboratory sample and provide very
Altitude.
The present invention also provides a kind of methods tested using above-mentioned experimental provision, comprising:
The first step connects each pipeline of experimental provision, carries out air tightness test；Using vacuum evacuation device to experimental provision
Carry out vacuum pumping；
The temperature of temperature-controlled cabinet is set as 40 DEG C using temperature control system, guaranteed as injection CO by second step2Pressure
When greater than 7.38MPa, CO2Undergoing phase transition becomes supercriticality；
Third step applies the confining pressure of 1MPa first with confining pressure system confining pressure control pressure pump, it is ensured that rock to rock sample
Sample is in a stable confining pressure state；Pass sequentially through the axis pressure that axial compressive force control pump applies 1MPa to Rock experiment sample
And 1MPa Pore Pressure is applied to Rock experiment sample by upstream pressure pump, downstream pressure pump and pore pressure control pump, and
Check again for the whole air-tightness of system；
4th step increases confining pressure, axis pressure and hole using confining pressure system, axis pressure system and hole pressure control system step by step
Pressure, and carry out Transient Method permeability using the pressure difference of upstream pressure pump and downstream pressure pump in different stress levels and test.
Meanwhile using the deformation of coal petrography in displacement sensor monitoring loading procedure, Rock experiment sample is monitored using sound emission acquisition system
Product acoustic emission information；Consider gas injection process, the time effect that gas is spread in Rock experiment sample, in each confining pressure, axis pressure
With hole voltage levels, permeability 48h is continued to monitor, so that gas is spread balance in Rock experiment sample, obtains different stress water
Permeability Temporal Evolution curve under flat；
5th step keeps confining pressure control pressure pump pressure 15MPa and axial compressive force control pump pressure 15MPa constant, passes through
Pore pressure control pump increases gas injection pressure step by step, controls temperature using temperature sensor, it is axial that displacement sensor monitors sample
Deformation, sound emission acquisition system monitor acoustie emission event；It tests different aperture pressure and acts on lower Permeability Oe Coal And Porous Rock And Fractured Rock numerical value, obtain outside
Under stress permanence condition, resultant stress-strain-permeability-sound emission curve.
The invention has the benefit that
1. realizing under heat flow piercement environment, axis presses system, confining pressure system, Pore Pressure system and temperature control system
Organic assembling.
2. utilizing temperature control system and fluid pressure control system, the phase that can accurately control carbon dioxide becomes
Change, to realize note supercritical carbon dioxide coal petrography multi-field coupling effects mechanical property testing.
3. realizing rock sample upstream and downstream pressure using the upstream and downstream secondary pressure pump being arranged in fluid pressure control system
Difference carries out the Transient Method permeability test of Oil in Super-low Permeability rock.
4. designing O-shaped and double O-shaped pressing plate for sealing devices, the fracturing experiments of indoor small-size coal petrography, Simultaneous Monitoring pressure are realized
The acoustic emission signal of process is split, coal petrography crack initiation and failure mechanism under heat flow piercement environment are deeply grasped.
5. temperature control system, Surrounding Rock System, axis pressure system, Pore Pressure system and information acquisition system are integrated in calculating
Machine software control system, and uniformly manipulated；Implement to realize the synchronous of the various loading capacities of experimentation, monitoring quantity
Real-time synchronization monitoring.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of experimental provision in the embodiment of the present invention.
Fig. 2 show the structural schematic diagram of temperature control system.
Fig. 3 show O-shaped sealing clamp structural schematic diagram.
Fig. 4 show double O-shaped sealing clamp structural schematic diagrams.
In figure: 1-counter-force pedestal；2-outer tubes；3-interior flexible pipes；41-the first sealing clamp；42-the second sealing pressure
Plate；5-clampers；6-temperature sensors；7-temperature-controlled cabinets；8-support carriers；9-displacement sensors (LVDT)；10—
Heating device；11-computers；12-sound emission acquisition devices；13-confining pressures control pressure pump；14-confined pressure control valve doors
(V1)；15-axial compressive force control valves (V2)；16-upstream pressures pump；17-downstream pressures pump；18-vacuum evacuation devices；
19-axial compressive forces control pump；20-pressure sensors；21-connecting interfaces；22-gas sources；23-pore pressures control pump.
Specific embodiment
Below in conjunction with specific attached drawing the present invention is described in detail specific embodiment.It should be noted that in following embodiments
The combination of the technical characteristic or technical characteristic of description is not construed as isolated, they can be combined with each other to reaching
To superior technique effect.In the drawings of the following embodiments, the identical label that each attached drawing occurs represent identical feature or
Person's component, can be apply to different embodiments.
As shown in Figure 1, a kind of note supercritical carbon dioxide coal petrography multi-field coupling effects mechanical characteristic of the embodiment of the present invention is surveyed
Examination and fracturing experiments device, including confining pressure system, axis press system, Pore Pressure system, temperature control system, Information Collecting & Processing system
System；
The confining pressure system, axis pressure system and Pore Pressure system can simultaneously for laboratory sample provide respectively confining pressure, axis pressure and
Pore Pressure；The temperature control system provides temperature control for laboratory sample；The data collecting and processing system to confining pressure system,
Axis pressure system, the real time data of Pore Pressure system are acquired and handle.
The confining pressure system provides different size of circumference stress during the experiment for rock sample sample；As one kind
Specific implementation, the confining pressure system include outer tube 2, interior flexible pipe 3, confining pressure control pressure pump 13 and confined pressure control valve door
14；The interior flexible pipe 3 is fixed in 2 cavity of outer tube, and 2 cavity of outer tube is full of the first liquid；The confining pressure control
Pressure pump 13 is connect by the confined pressure control valve door 14 with the cavity of the outer tube 2；Laboratory sample is placed in the interior flexibility
Inside pipe 3；The confining pressure control pressure pump 13 controls the pressure of the first liquid in 2 cavity of outer tube, first liquid
Pressure passes to laboratory sample by the interior flexible pipe 3, forms the confining pressure of laboratory sample.
Various ways can be used in fixation between outer tube 2 and interior flexible pipe 3, it is preferred that the outer tube 2 and interior flexible pipe 3
Fixed form are as follows: the both ends of the outer tube 2 are respectively provided with counter-force pedestal 1, and the counter-force pedestal 1 is threadedly connected to the outer tube 2
End, clamper 5 is threadedly connected to the counter-force pedestal 1, and 2 ends of the interior flexible pipe 3 are socketed on 2 clampings respectively
Device 5.
Axis pressure system provides different size of axial stress for experiment sample, it is preferred that the axis presses the system to include
First sealing clamp 41, the second sealing clamp 42, axial compressive force control pump 19, axial compressive force control valve 15；Described first is close
Envelope pressing plate 41, the second sealing clamp 42 are all set in interior flexible 3 pipe, the sealing of the first sealing clamp 41, second pressure
The confined space that plate 42 and interior flexible pipe 3 are collectively formed is for placing laboratory sample；First sealing clamp 41 and clamper 5
It is fixedly connected, second sealing clamp 42 can slide in the interior flexible pipe 3；Second sealing clamp 42, interior flexible pipe 3 and
Confined space between clamper 5 forms axis and presses chamber, and the axis pressure is intracavitary to be full of second liquid, the axial compressive force control pump 19
Chamber is pressed to connect with the axis by the axial compressive force control valve 15；The 19 control axis of axial compressive force control pump presses chamber
The pressure of interior second liquid, second sealing clamp 42 is under the second liquid pressure-driven, in the interior flexible pipe 3
Sliding, extrusion experiment sample provide axis pressure for laboratory sample.Preferably, first sealing clamp 41, the second sealing clamp 42
Can be used it is O-shaped or double O-shaped, as shown in Figure 3, Figure 4.The design of O-shaped sealing clamp structure is biggish primarily directed to viscositys such as water
Fracturing fluid design can be effectively prevented fracturing fluid spilling etc.；The design of double O-shaped sealing clamp structures is primarily directed to two
The lesser fracturing fluid design of the viscositys such as carbonoxide and supercritical carbon dioxide, realizes the sealing function of fracturing process fracturing fluid.
Hole pressure control system is to realize Rock experiment sample internal void, crack pressurization and Transient Method permeability
Test；The Pore Pressure system includes gas source 22, upstream pressure pump 16, downstream pressure pump 17, pore pressure control pump 23；It is described
Through-hole is provided on first sealing clamp 41, the second sealing clamp 42；The upstream pressure pump 16 is close by being set to first
The through-hole sealed on pressing plate 41 applies upstream pressure to laboratory sample, and the downstream pressure pump 17 is by being set to the second sealing clamp
Through-hole applies downstream pressure to laboratory sample on 42；The gas source 22 is connect with pore pressure control pump 23, the pore pressure
Control pump 23 is connect with upstream pressure pump 16 and downstream pressure pump 17 respectively.In use, gas source 22 pumps 23 to pore pressure control
The gas of certain pressure is provided；At this point, pore pressure control pump 23 can carry out secondary pressurized to gas in pumping, it is loaded onto experiment
Required pressure value；Pore pressure control pump 23 is connected with upstream pressure pump 16 and downstream pressure pump 17 respectively, upstream
Pressure pump 16 and downstream pressure pump 17 provide certain pressure；Upstream pressure pump 16 and downstream pressure pump 17 pressurizations by itself
Device, pressure difference needed for making respective pressure reach experiment, to realize that the Transient Method of laboratory sample surveys permeability.
As shown in Fig. 2, the temperature control system is to be in the fluid in experiment sample (rock sample) and loading system to set
Fixed temperature constant state ensures that carbon dioxide can mutually become supercriticality in experimentation, and the temperature control system includes
Temperature-controlled cabinet 7, heating device 10, temperature sensor 6, support carriers 8；The outer tube 2, interior flexible pipe 3 and laboratory sample are equal
It is arranged in the temperature-controlled cabinet 7, heating device 10 and temperature sensor 6, institute is set on the inner wall of the temperature-controlled cabinet 7
It states support carriers 8 and is used to support the outer tube 2.It is additionally provided with connecting interface 21 on the temperature-controlled cabinet 7, is entered for pipeline
Temperature-controlled cabinet 7.Connecting interface 21 has certain sealing function, and the mainly temperature in guarantee temperature-controlled cabinet 7 is constant, even
Connection interface 21 is embedded in temperature-controlled cabinet 7, and there is screw thread at both ends, the device that can be separately connected inside and outside temperature-controlled cabinet 7.
Information acquisition system is to realize that the real-time, synchronous of each physical quantity is received in entire experimental provision load and test process
Collection；The data collecting and processing system includes the temperature sensor 6, displacement sensor 9, sound emission acquisition device 12, calculates
Machine 11；The displacement on second sealing clamp 42, for measurement experiment sample is arranged in institute's displacement sensors 9；The meter
Calculation machine 11 is connect with the temperature sensor 6, displacement sensor 9, sound emission acquisition device 12 respectively；The computer also acquires
Confining pressure, axis pressure and the Pore Pressure of laboratory sample, realize pressure measurement by pressure sensor 20.
The workflow of experimental provision of the present invention is as follows:
The first step connects each pipeline of experimental provision, carries out air tightness test.Then, vacuum evacuation device 18 is utilized
Vacuum pumping is carried out to experimental provision.
The temperature of temperature-controlled cabinet 7 is set as 40 DEG C using temperature control system, guaranteed as injection CO by second step2Pressure
When power is greater than 7.38MPa, CO2It will undergo phase transition as supercriticality.
Third step applies the confining pressure of 1MPa first with confining pressure system confining pressure control pressure pump 13 etc. to rock sample, it is ensured that
Rock sample is in a stable confining pressure state.Axis pressure system axial pressure control pump 19 etc. is passed sequentially through to apply rock sample
The axis of 1MPa is added to press and by Pore Pressure system upstream pressure pump 16, downstream pressure pump 17 and pore pressure control 23 pairs of rocks of pump
Stone sample applies 1MPa Pore Pressure, and checks again for the whole air-tightness of system.
4th step increases confining pressure, axis pressure and hole using above-mentioned confining pressure system, axis pressure system and hole pressure control system step by step
Gap pressure, and carry out Transient Method permeability using the pressure difference of upstream pressure pump 16 and downstream pressure pump 17 in different stress levels
Test.Meanwhile the deformation of coal petrography in loading procedure is monitored using displacement sensor (LVDT) 9, utilize sound emission acquisition system 12
Monitor the information such as rock sample sound emission.Consider gas injection process, the time effect that gas is spread in rock sample is enclosed each
Pressure, axis pressure and hole voltage levels, continue to monitor permeability 48h (gas spreads balance in rock sample), obtain different stress
Permeability Temporal Evolution curve under horizontal.
5th step keeps confining pressure control 13 pressure 15MPa of pressure pump and (19) axial compressive force control pump pressure 15MPa not
Become, gas injection pressure (Pore Pressure) increased by hole pressure control pump 23 step by step, is stablized using 6 control system of temperature sensor,
Displacement sensor (LVDT) 9 monitors axial deformation, and sound emission acquisition system 12 monitors acoustie emission event, and test different aperture
Pressure acts on lower Permeability Oe Coal And Porous Rock And Fractured Rock numerical value, obtains under external stress permanence condition, resultant stress-strain-permeability-sound emission curve.
Although several embodiments of the present invention are had been presented for herein, it will be appreciated by those of skill in the art that In
Without departing from the spirit of the invention, the embodiments herein can be changed.Above-described embodiment is only exemplary, no
It should be using the embodiments herein as the restriction of interest field of the present invention.
Claims (10)
1. a kind of note supercritical carbon dioxide coal petrography mechanical property testing and fracturing experiments device, which is characterized in that including confining pressure
System, axis press system, Pore Pressure system, temperature control system, data collecting and processing system；
The confining pressure system, axis pressure system and Pore Pressure system can provide confining pressure, axis pressure and hole simultaneously for laboratory sample respectively
Pressure；The temperature control system provides temperature control for laboratory sample；The data collecting and processing system is to confining pressure system, axis pressure
System, the real time data of Pore Pressure system are acquired and handle.
2. experimental provision as described in claim 1, which is characterized in that the confining pressure system includes outer tube, interior flexible pipe, confining pressure
Control pressure pump and confined pressure control valve door；
The interior flexible pipe is fixed in outer lumen body, and the outer tube cavity is full of the first liquid；The confining pressure control pressure
Power pump is connect by the confined pressure control valve door with the cavity of the outer tube；Laboratory sample is placed in the interior flexible tube；
The confining pressure control pressure pump controls the pressure of the first liquid in the outer lumen body, and the pressure of first liquid passes through described
Interior flexible pipe passes to laboratory sample, forms the confining pressure of laboratory sample.
3. experimental provision as claimed in claim 2, which is characterized in that the fixed form of the outer tube and interior flexible pipe are as follows: institute
The both ends for stating outer tube are respectively provided with counter-force pedestal, and the counter-force whorl of base is connected to the end of the outer tube, and clamper screw thread connects
It is connected to the counter-force pedestal, 2 ends of the interior flexible pipe are socketed on 2 clampers respectively.
4. experimental provision as claimed in claim 3, which is characterized in that the axis pressure system includes the first sealing clamp, second
Sealing clamp, axial compressive force control pump, axial compressive force control valve；
First sealing clamp, the second sealing clamp are all set in the interior flexible pipe, first sealing clamp, second
The confined space that sealing clamp and interior flexible pipe are collectively formed is for placing laboratory sample；First sealing clamp and clamper
It is fixedly connected, second sealing clamp can slide in the interior flexible pipe；
Confined space between second sealing clamp, interior flexible pipe and clamper forms axis and presses chamber, and the axis pressure is intracavitary to fill
Full second liquid, the axial compressive force control pump press chamber to connect by the axial compressive force control valve with the axis；The axis
The pressure that the axis presses intracavitary second liquid is controlled to pressure control pump, second sealing clamp is in the second liquid pressure
It under driving, is slided in the interior flexible pipe, extrusion experiment sample, provides axis pressure for laboratory sample.
5. experimental provision as claimed in claim 4, which is characterized in that the Pore Pressure system include gas source, upstream pressure pump,
Downstream pressure pump, pore pressure control pump；
Through-hole is provided on first sealing clamp, the second sealing clamp；The upstream pressure pump is by being set to first
Through-hole on sealing clamp applies upstream pressure to laboratory sample, and the downstream pressure pump is by being set on the second sealing clamp
Through-hole applies downstream pressure to laboratory sample；
The gas source and pore pressure control pump connection, and the pore pressure control pump pumps respectively with upstream pressure and downstream pressure
Pump connection.
6. such as the described in any item experimental provisions of claim 2-5, which is characterized in that the temperature control system includes temperature control
Case processed, heating device, temperature sensor, support carriers；
The outer tube, interior flexible pipe and laboratory sample are arranged in the temperature-controlled cabinet, the inner wall of the temperature-controlled cabinet
Upper setting heating device and temperature sensor, the support carriers are used to support the outer tube.
7. experimental provision as claimed in claim 6, which is characterized in that the data collecting and processing system includes that the temperature passes
Sensor, displacement sensor, sound emission acquisition device, computer；
The displacement on second sealing clamp, for measurement experiment sample is arranged in institute's displacement sensors；
The sound emission acquisition device includes acoustic emission probe and sound emission Acquisition Instrument；The acoustic emission probe setting is close first
It seals on pressing plate and/or the second sealing clamp, the acoustic emission probe is connected to sound emission Acquisition Instrument by data line；
The computer is connect with the temperature sensor, displacement sensor, sound emission Acquisition Instrument respectively；
The computer acquires the confining pressure of laboratory sample, axis pressure and Pore Pressure simultaneously.
8. experimental provision as claimed in claim 4, which is characterized in that first sealing clamp, the second sealing clamp are O
Type is double O-shaped.
9. experimental provision as claimed in claim 6, which is characterized in that the experimental provision further includes vacuum evacuation device, described
Vacuum means are set to laboratory sample and provide vacuum environment.
10. the method tested using the experimental provision as described in claim any one of 1-9 characterized by comprising
The first step connects each pipeline of experimental provision, carries out air tightness test；Experimental provision is carried out using vacuum evacuation device
Vacuum pumping；
The temperature of temperature-controlled cabinet is set as 40 DEG C using temperature control system, guaranteed as injection CO by second step2Pressure is greater than
When 7.38MPa, CO2Undergoing phase transition becomes supercriticality；
Third step applies the confining pressure of 1MPa first with confining pressure system confining pressure control pressure pump, it is ensured that rock sample to rock sample
The confining pressure state stable in one；Pass sequentially through axial compressive force control pump to Rock experiment sample apply 1MPa axis pressure and
1MPa Pore Pressure is applied to Rock experiment sample by upstream pressure pump, downstream pressure pump and pore pressure control pump, and again
The whole air-tightness of inspection system；
4th step increases confining pressure, axis pressure and Pore Pressure using confining pressure system, axis pressure system and hole pressure control system step by step, and
Carry out Transient Method permeability using the pressure difference of upstream pressure pump and downstream pressure pump in different stress levels to test.Meanwhile
Using the deformation of coal petrography in displacement sensor monitoring loading procedure, sent out using sound emission acquisition system monitoring Rock experiment sample sound
Penetrate information；Consider gas injection process, the time effect that gas is spread in Rock experiment sample, in each confining pressure, axis pressure and hole
Voltage levels continue to monitor permeability 48h, so that gas is spread balance in Rock experiment sample, obtain under different stress levels
Permeability Temporal Evolution curve；
5th step keeps confining pressure control pressure pump pressure 15MPa and axial compressive force control pump pressure 15MPa constant, passes through hole
Pressure control pump increases gas injection pressure step by step, controls temperature using temperature sensor, and displacement sensor monitors sample axial deformation,
Sound emission acquisition system monitors acoustie emission event；It tests different aperture pressure and acts on lower Permeability Oe Coal And Porous Rock And Fractured Rock numerical value, obtain external stress
Under permanence condition, resultant stress-strain-permeability-sound emission curve.
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