CN110501272A - The method for testing porous rock porosity and permeability simultaneously under the conditions of triaxial stress and pore pressure - Google Patents
The method for testing porous rock porosity and permeability simultaneously under the conditions of triaxial stress and pore pressure Download PDFInfo
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- CN110501272A CN110501272A CN201910676629.0A CN201910676629A CN110501272A CN 110501272 A CN110501272 A CN 110501272A CN 201910676629 A CN201910676629 A CN 201910676629A CN 110501272 A CN110501272 A CN 110501272A
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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
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
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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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- 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
- G01N15/088—Investigating volume, surface area, size or distribution of pores; Porosimetry
Abstract
The method that the invention discloses a kind of to test porous rock porosity and permeability simultaneously under the conditions of triaxial stress and pore pressure belongs to rock storage body engineering research scope.This method applies pore pressure to the reservoir rock sample under triaxial state of stress using the motor servo pump of upstream and downstream, the test of the rock pore volume under the conditions of the pore pressure can be obtained by passing through setting pump fluid pressure and obtaining fluid volume data in pump, the flow under the pressure difference by rock is tested after adjusting permeable pressure head by injection pump and collecting pump simultaneously, to obtain the permeability under the stress state.The present invention is by being arranged different confining pressure conditions, bias condition and the fluid pressure value of rock sample upper end, lower end, porosity and permeability of the reservoir rock under the conditions of different stress and pore pressure can be tested simultaneously, provide technical parameter for the exploitation of fluid substance in the porous rock reservoir of deep and injection process control.
Description
Technical field
The present invention relates to one kind to test porous rock porosity and infiltration simultaneously under the conditions of triaxial stress and pore pressure
The method of rate, the test method belong to rock storage body engineering research scope mainly for reservoir porous rock.It is mainly used for studying
Porous rock stores up body storage space and the coevolution of permeance property rule under different water pressures and reservoir stress environment.It is applicable in
The experimental study of multi- scenarios method problem in science in the exploitation of fluid substance and injection process of deep porous layer storage body.
Background technique
Infiltration coefficient and porosity are evaluation indexes important in porous rock storage body engineering.Carbon dioxide geologic sequestration,
Coal bed gas and underground heat exploitation, geological disposal of nuclear waste, seawater recharge etc. belong to storage body engineering.In the injection of rock stratum storage body and extract
During, the lifting of pore water pressure causes rock deformation that porosity is caused to change.The deformation of hole is embodied in hole
Size changes and the connection situation of hole changes, i.e. the storage space that the deformation of hole not only will affect rock storage body also will affect
The flow channel of underground water and the seepage characteristic of rock stratum.For porous rock, pore structure has certain deformation model
It encloses, the factor for influencing its hole mechanical deformation includes rock external stress condition and pore pressure condition.Different stress items
The porosity and permeability obtained under part has larger difference.Therefore, it is needed in Study In Reservoir rock mass porosity and permeability
In conjunction with its stress condition.Permeability and porosity data are for stress in research porous rock storage body engineering in process of rock deformation
The multi- scenarios methods such as field, seepage field mechanism and the determination of field engineering technical parameter are all extremely important.Therefore how storage is tested simultaneously
Body injection becomes in the urgent need to address with permeability with the porosity under formation pore pressure change condition in extraction process and asks
Topic.
Currently, for the test method of rock porosity and permeability is measured for example, Chinese patent simultaneously under stress condition
Publication number: 103207138 A publication date of CN: 2013.07.17 is entitled, and " simultaneous determination is fine and close under a kind of dynamic confining pressure
The method of rock permeability and porosity ", this method is for tight rock, using gas differential pressure Transient Method, the party
Method is not suitable for that porosity is larger, the higher rock of permeability, and does not consider biasing force to permeability and hole in test process
The influence of gap rate, the also influence of non-analysis of pipeline channel and rock sample sleeve side walls gap to test result.Steady state method is used at present
The equipment and porosity measurement equipment for measuring permeability are mostly mutually independent and do not consider complicated field stress condition and Pore Pressure
Power situation of change.To make up the deficiency, it is proposed that using the motor of the model PMHP50-500 of France TOP industrie production
Servopump.Motor servo pump is not only able to can also to rock sample application pore pressure by setting flow value and pressure value
Fluid volume in the pump is recorded by pumping inner piston station acquisition module, scale is accurate to 10-3mm3.By pumping fluid pressure
Setting and in pumping the monitoring of fluid volume can obtain the test of the rock pore volume under different aperture pressure condition, simultaneously
The flow under the pressure difference by rock is tested after adjusting permeable pressure head by injection pump and collecting pump, to obtain the stress state
Under permeability.
During the test, the fluid of injection pump output, which can be not only filled in rock sample hole, can also be filled to equipment
Gap between seepage flow circuit, including equipment seepage flow pipeline, rock sample and seal pipe and infiltration gasket, this part is filled in equipment
Fluid volume in system is known as consuming fluid volume.The fluid volume V of upstream motor servo pump injectioninIt is watched including downstream motor
The fluid volume V that clothes pump is collectedout, pore-fluid volume VpWith consume fluid volume Vu.When testing porosity, need to this part
Consume fluid volume VuCaused error is eliminated.Since device systems pipeline etc. belongs to rigid structure, and disregard fluid
Compression, it is definite value that volume is consumed in this part, can be obtained by research technique.
Summary of the invention
In view of the above problems, the purpose of the present invention is to provide one kind under the conditions of triaxial stress and pore pressure
The method for testing porous rock porosity and permeability simultaneously.
To achieve the above object, the invention adopts the following technical scheme:
The method for testing porous rock porosity and permeability simultaneously under condition of triaxial stress, the test method include three axis
Reservoir under the conditions of the calibration of consume fluid volume and triaxial stress and pore pressure in seepage flow circuit under the conditions of stress and pore pressure
It is tested while porous rock porosity is with permeability, test method sequentially includes the following steps:
The consume fluid volume calibration in seepage flow circuit under the conditions of triaxial stress and pore pressure
Diameter 50mm, the standard cylindrical steel sample of height 100mm are packed into sealing sleeve pipe by a, standard cylindrical steel sample upper and lower side
Infiltration gasket is placed in face, and sealing sleeve pipe is fixed between triaxial chamber inner ram and pedestal, is installed between pressure head and pedestal
LVDT, among sealing sleeve pipe install transversely deforming meter, respectively acquire standard cylindrical steel sample loading procedure in axial deformation and
Transversely deforming data.
Seepage channel entrance on b triaxial chamber pedestal is pumped respectively with entrance motor servo by the first three-way valve and water storage
Container is connected with stainless steel tube, and entrance motor servo pump is connected with water storage container again, wherein when the first three-way valve is opened, is seeped
Flow channel inlet is connected to entrance motor servo pump, forms upstream seepage flow circuit；When first three-way valve is closed, seepage channel enters
Mouth is connected to water storage container, forms drain outlet loop.
Infiltration lane outlet on c triaxial chamber pressure head by the second three-way valve and valve respectively with Motor Export servo
Pump, air compressor are connected with vacuum pump with stainless steel tube, and Motor Export servopump is connected with water storage container again, wherein second
When three-way valve is opened, infiltration lane outlet is connected to Motor Export servopump, forms downstream seepage flow circuit；Second three-way valve
When closing, infiltration lane outlet is connected to air compressor, forms drain inlet circuit.
D closes the first three-way valve and the second three-way valve, and starting air compressor stops after inner fluid passage drains
Only air compressor opens the first three-way valve and the second three-way valve, opens valve, starts vacuum pump, takes out to seepage flow circuit
Vacuum 10min or more closes valve, stops vacuum pump.
E starts entrance motor servo pump and Motor Export servopump, and is its water-filling, full of after water, stops entrance motor
Servopump and Motor Export servopump terminate water filling process, record two motor servos and pump interior initial fluid volumeWith
F opens confining pressure valve, applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, to confining pressure and deform constant
Afterwards, bias valve is opened, σ is biased3-σ1。
The pressure value of g inlet porting motor servo pump and Motor Export servopump is respectively PinAnd Pout, while starting two
Motor servo pump, when the fluid volume reading of Motor Export servopump starts to significantly increase, stopping motor servo pump, record is at this time
Fluid volume in entrance motor servo pump and Motor Export servopumpWithBy being obtained currently according to mass conservation law
The consume fluid volume V in seepage flow circuit under the conditions of triaxial stress and pore pressureu:
I.e.
Under the conditions of triaxial stress and pore pressure reservoir porous rock porosity with permeability while test
H takes out standard cylindrical steel sample out of sealing sleeve pipe, and change diameter D is 50 ± 1mm, and height H is 100 ± 2mm's
Standard cylinder rock sample, standard cylinder rock sample upper and lower end face place infiltration gasket, sealing sleeve pipe are fixed on three axis
Between indoor pressure head and pedestal, LVDT is installed between pressure head and pedestal, transversely deforming meter is installed among sealing sleeve pipe, respectively
Axial deformation and transversely deforming data in acquisition standard cylinder rock sample loading procedure.
I closes the first three-way valve and the second three-way valve, and starting air compressor stops after inner fluid passage drains
Only air compressor opens the first three-way valve and the second three-way valve, opens valve, starts vacuum pump, takes out to seepage flow circuit
Vacuum 10min or more closes valve, stops vacuum pump.The initial flow of record entry motor servo pump and Motor Export servopump
Body volumeWith
J opens confining pressure valve, applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, to confining pressure and deform constant
Afterwards, bias valve is opened, σ is biased3-σ1。
The pressure value of k inlet porting motor servo pump and Motor Export servopump is respectively PinAnd Pout, while starting two
Motor servo pump, when the fluid volume of Motor Export servopump reading, which starts to stablize, to be increased, seepage stability records the time respectively
t1And t2Fluid volume in the entrance motor servo pump at moment and the pump of Motor Export servopumpWithBy
This is obtained:
Wherein, VpFor pore volume:
VuSeepage flow circuit under the conditions of the triaxial stress and pore pressure for being obtained for above-mentioned consume fluid volume calibration process
Consume fluid volume,
V is the volume of standard cylinder rock sample: V=π D2H/4,
Permeability k=v μ H/ Δ P formula three
Wherein, v is flow velocity:
A is the cross-sectional area of standard cylinder rock sample: A=π D2/ 4,
Δ t is the period: Δ t=t2-t1,
μ is seepage flow fluid viscous coefficient,
Δ P is permeable pressure head: Δ P=Pin-Pout。
The scale of the entrance motor servo pump and Motor Export servopump is accurate to 10-3mm3And stream in pump can be acquired
The motor servo of body volume pumps, it is proposed that using the motor servo of the model PMHP50-500 of France TOP industrie production
Pump.
Due to using above technical scheme, the present invention is had the advantages that:
1, the pore deformation of reservoir porous rock is limited by the collective effect of external pressure and pore pressure, and different three axis are answered
Power and different aperture pressure condition can all have an impact to the test result of its permeability and porosity, therefore, the stress of rock
Condition also contemplates biasing force in addition to confining pressure, and pore pressure not only considers the hole that permeable pressure head also contemplates upstream and downstream
Pressure value.The pore pressure for being controlled upstream and downstream respectively using entrance motor servo pump and Motor Export servopump, is measured not
With the permeability and porosity under the conditions of triaxial stress and pore pressure.
2, interior fluid volume data function is pumped using the automatic collection of PMHP50-500 motor servo pump, in the case where applying upstream
Swim pore pressure while measure upstream injection fluid volume and downstream collection fluid volume, obtain pore volume data with
And the data on flows of the cross-section of river, to calculate porosity and permeability simultaneously.
3, the porosity test under the conditions of different triaxial stresses and pore pressure is eliminated corresponding using rating test
The consume fluid volume in seepage flow circuit is missed to caused by reservoir rock pore volume measurements under the conditions of triaxial stress and pore pressure
Difference.
Detailed description of the invention
Fig. 1 is the schematic diagram of test method of the present invention；
Specific embodiment
Below in conjunction with specific implementation, the present invention will be further described with calculation method.
The method for testing porous rock porosity and permeability simultaneously under the conditions of triaxial stress and pore pressure, test method
It sequentially includes the following steps:
Pore pressure is applied to storage body porous rock upper and lower side as pore-fluid using water.
The consume water volume calibration in seepage flow circuit under the conditions of triaxial stress and pore pressure
Diameter 50mm, the standard cylindrical steel sample of height 100mm are packed into sealing sleeve pipe by a, standard cylindrical steel sample upper and lower side
Infiltration gasket is placed in face, sealing sleeve pipe is fixed between triaxial chamber inner ram 1 and pedestal 2, between pressure head 1 and pedestal 2
LVDT3 is installed, transversely deforming meter 4 is installed among sealing sleeve pipe, acquires the axial direction in standard cylindrical steel sample loading procedure respectively
Deformation and transversely deforming data.
Seepage channel entrance 5 on b triaxial chamber pedestal 2 by the first three-way valve 6 respectively with entrance motor servo pump 7 and
Water storage container 8 is connected with stainless steel tube, and entrance motor servo pump 7 is connected with water storage container 8 again, wherein the first three-way valve 6 is beaten
When opening, seepage channel entrance 5 is connected to entrance motor servo pump 7, forms upstream seepage flow circuit；When first three-way valve 6 is closed,
Seepage channel entrance 5 is connected to water storage container 8, forms drain outlet loop.
Infiltration lane outlet 9 on c triaxial chamber pressure head 1 by the second three-way valve 10 and valve 11 respectively with Motor Export
Servopump 12, air compressor 13 are connected with vacuum pump 14 with stainless steel tube, Motor Export servopump 12 again with 8 phase of water storage container
Even, wherein when the second three-way valve 10 is opened, infiltration lane outlet (9) is connected to Motor Export servopump 12, is formed downstream and is seeped
Flow back to road；When second three-way valve 10 is closed, infiltration lane outlet 9 is connected to air compressor 13, forms drain inlet circuit.
D closes the first three-way valve 6 and the second three-way valve 10, starts air compressor 13, after in-channel water drains,
Stop air compressor 13, open the first three-way valve 6 and the second three-way valve 10, open valve 11, starts vacuum pump 14, it is right
Seepage flow vacuum-pumping loop 10min or more closes valve 11, stops vacuum pump 14.
E starts entrance motor servo pump 7 and Motor Export servopump 12, and is its water-filling, after being full of water, stops entrance electricity
Machine servopump 7 and Motor Export servopump 12 terminate water filling process, record two motor servos and pump interior initial water volumeWith
F opens confining pressure valve 15, applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, permanent to confining pressure and deformation
After fixed, bias valve 16 is opened, σ is biased3-σ1。
The pressure value of g inlet porting motor servo pump 7 and Motor Export servopump 12 is respectively PinAnd Pout, start simultaneously
Two motor servo pumps, when the water volume reading of Motor Export servopump 12 starts to significantly increase, stopping motor servo pump is recorded
Water volume in entrance motor servo pump 7 and Motor Export servopump 12 at this timeWithIt is obtained according to mass conservation law
The consume water volume V in seepage flow circuit under the conditions of current triaxial stress and pore pressureu:
I.e.
It is tested while porous rock porosity is with permeability
H takes out standard cylindrical steel sample out of sealing sleeve pipe, and change diameter D is 50 ± 1mm, and height H is 100 ± 2mm's
Standard cylinder rock sample, standard cylinder rock sample upper and lower end face place infiltration gasket, sealing sleeve pipe are fixed on three axis
Between indoor pressure head 1 and pedestal 2, LVDT3 is installed between pressure head 1 and pedestal 2, transversely deforming meter is installed among sealing sleeve pipe
4, the axial deformation and transversely deforming data in standard cylinder rock sample loading procedure are acquired respectively.
I closes the first three-way valve 6 and the second three-way valve 10, starts air compressor 13, after in-channel water drains,
Stop air compressor 13, open the first three-way valve 6 and the second three-way valve 10, open valve 11, starts vacuum pump 14, it is right
Seepage flow vacuum-pumping loop 10min or more closes valve 11, stops vacuum pump 14.Record entry motor servo pump 7 and Motor Export
The initial water volume of servopump 12With
J opens confining pressure valve 15, applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, permanent to confining pressure and deformation
After fixed, bias valve 16 is opened, σ is biased3-σ1。
The pressure value of k inlet porting motor servo pump 7 and Motor Export servopump 12 is respectively PinAnd Pout, start simultaneously
Two motor servo pumps, when the water volume of Motor Export servopump 12 reading, which starts to stablize, to be increased, seepage stability records respectively
Time t1And t2The pump inner volume of entrance motor servo pump (7) and Motor Export servopump (12) at momentWithThus it obtains
Wherein, VpFor pore volume:
VuSeepage flow circuit under the conditions of the triaxial stress and pore pressure for being obtained for above-mentioned consume water volume calibration process
Water volume is consumed,
V is the volume of standard cylinder rock sample: V=π D2H/4,
Permeability k=v μ H/ Δ P formula three
Wherein, v is flow velocity:
A is the cross-sectional area of standard cylinder rock sample: A=π D2/ 4,
Δ t is the period: Δ t=t2-t1,
μ is the water coefficient of viscosity,
Δ P is permeable pressure head: Δ P=Pin-Pout。
Confining pressure σ is measured in this way3, bias σ3-σ1, entrance and exit pore pressure is respectively PinAnd PoutUnder the conditions of hole
Rate and permeability.
Hole by repeating step j-k, under available difference confining pressure difference bias and different aperture pressure condition
Rate and permeability evolution curve.
Specific embodiment
Below in conjunction with specific implementation case, the present invention will be further described.
Using Red Sandstone as case subjects, Red Sandstone porosity is tested simultaneously under the conditions of triaxial stress and pore pressure
With the method for permeability, test method is sequentially included the following steps:
Implement 10MPa confining pressure and 5MPa bias respectively and Red Sandstone rock sample upper and lower side is applied as pore-fluid using water
Add pore pressure.
The consume water volume calibration in seepage flow circuit under the conditions of triaxial stress and pore pressure
Diameter 50mm, the standard cylindrical steel sample of height 100mm are packed into sealing sleeve pipe by a, standard cylindrical steel sample upper and lower side
Infiltration gasket is placed in face, sealing sleeve pipe is fixed between triaxial chamber inner ram 1 and pedestal 2, between pressure head 1 and pedestal 2
LVDT3 is installed, transversely deforming meter 4 is installed among sealing sleeve pipe, acquires the axial direction in standard cylindrical steel sample loading procedure respectively
Deformation and transversely deforming data.
Seepage channel entrance 5 on b triaxial chamber pedestal 2 by the first three-way valve 6 respectively with entrance motor servo pump 7 and
Water storage container 8 is connected with stainless steel tube, and entrance motor servo pump 7 is connected with water storage container 8 again, wherein the first three-way valve 6 is beaten
When opening, seepage channel entrance 5 is connected to entrance motor servo pump 7, forms upstream seepage flow circuit；When first three-way valve 6 is closed,
Seepage channel entrance 5 is connected to water storage container 8, forms drain outlet loop.
Infiltration lane outlet 9 on c triaxial chamber pressure head 1 by the second three-way valve 10 and valve 11 respectively with Motor Export
Servopump 12, air compressor 13 are connected with vacuum pump 14 with stainless steel tube, Motor Export servopump 12 again with 8 phase of water storage container
Even, wherein when the second three-way valve 10 is opened, infiltration lane outlet (9) is connected to Motor Export servopump 12, is formed downstream and is seeped
Flow back to road；When second three-way valve 10 is closed, infiltration lane outlet 9 is connected to air compressor 13, forms drain inlet circuit.
D closes the first three-way valve 6 and the second three-way valve 10, starts air compressor 13, after in-channel water drains,
Stop air compressor 13, open the first three-way valve 6 and the second three-way valve 10, open valve 11, starts vacuum pump 14, it is right
Seepage flow vacuum-pumping loop 10min or more closes valve 11, stops vacuum pump 14.
E starts entrance motor servo pump 7 and Motor Export servopump 12, and is its water-filling, after being full of water, stops entrance electricity
Machine servopump 7 and Motor Export servopump 12 terminate water filling process, record two motor servos and pump interior initial water volumeWith
F open confining pressure valve 15, to standard cylinder Red Sandstone sample uniform speed slow apply confining pressure arrive 10MPa, to confining pressure with
Deform it is constant after, open bias valve 16, be biased 5MPa.
The pressure value of g inlet porting motor servo pump 7 and Motor Export servopump 12 is respectively 2.5MPa and 1.5MPa, together
Two motor servo pumps of Shi Qidong, start to significantly increase, stop motor servo when the water volume of Motor Export servopump 12 is read
Pump, entrance motor servo pumps the water volume in 7 and Motor Export servopump 12 to record at this timeWithThe consumption in seepage flow circuit under the conditions of current triaxial stress and pore pressure is obtained according to mass conservation law
Damage water volume Vu:
I.e.
It is tested while Red Sandstone porosity is with permeability
H takes out standard cylindrical steel sample out of sealing sleeve pipe, and change diameter D is 49.89mm, and height H is 100.26mm's
Standard cylinder Red Sandstone sample, standard cylinder Red Sandstone sample upper and lower end face place infiltration gasket, sealing sleeve pipe are fixed on
Between triaxial chamber inner ram 1 and pedestal 2, LVDT3 is installed between pressure head 1 and pedestal 2, installs among sealing sleeve pipe and laterally becomes
Shape meter 4 acquires axial deformation and transversely deforming data in standard cylinder Red Sandstone sample loading procedure respectively.
I closes the first three-way valve 6 and the second three-way valve 10, starts air compressor 13, after in-channel water drains,
Stop air compressor 13, open the first three-way valve 6 and the second three-way valve 10, open valve 11, starts vacuum pump 14, it is right
Seepage flow vacuum-pumping loop 10min or more closes valve 11, stops vacuum pump 14.Record entry motor servo pump 7 and Motor Export
The initial water volume of servopump 12 With
J open confining pressure valve 15, to standard cylinder Red Sandstone sample uniform speed slow apply confining pressure arrive 10MPa, to confining pressure with
Deform it is constant after, open bias valve 16, be biased 5MPa.
The pressure value of k inlet porting motor servo pump 7 and Motor Export servopump 12 is respectively 2.5MPa and 1.5MPa, together
Two motor servo pumps of Shi Qidong, when the water volume of Motor Export servopump 12 reading, which starts to stablize, to be increased, seepage stability, point
Not Ji Lu time 0 and 10min entrance motor servo pump (7) and Motor Export servopump (12) pump inner volumeWithThus it obtains:
Consume water volume: Vu=20.8411ml
Pore volume:
The volume of standard cylinder Red Sandstone sample: V=π D2H/4=195.8955ml
Then obtain porosity:
Flow velocity:
Specimen cross sectional area: A=π D2/ 4=19.5387cm2
Period: Δ t=t2-t1=600s
The water coefficient of viscosity, μ=0.0014624pa*s
Permeable pressure head: Δ P=Pin-Pout=1MPa
Then obtain permeability: k=v μ H/ Δ P=3.4662 × 10-12cm2
Confining pressure 10MPa, bias 5MPa are measured in this way, entrance and exit pore pressure is respectively 2.5MPa and 1.5MPa item
Porosity and permeability under part.
Claims (2)
1. the method for testing porous rock porosity and permeability simultaneously under the conditions of triaxial stress and pore pressure, feature exist
In the test method sequentially includes the following steps:
The consume fluid volume calibration in seepage flow circuit under the conditions of triaxial stress and pore pressure
Diameter 50mm, the standard cylindrical steel sample of height 100mm are packed into sealing sleeve pipe by a, and standard cylindrical steel sample upper and lower end face is equal
Infiltration gasket is placed, sealing sleeve pipe is fixed between triaxial chamber inner ram (1) and pedestal (2), in pressure head (1) and pedestal (2)
Between install LVDT (3), among sealing sleeve pipe install transversely deforming meter (4), respectively acquire standard cylindrical steel sample loading procedure
In axial deformation and transversely deforming data；
Seepage channel entrance (5) on b triaxial chamber pedestal (2) is pumped with entrance motor servo respectively by the first three-way valve (6)
(7) it is connected with water storage container (8) with stainless steel tube, entrance motor servo pump (7) is connected with water storage container (8) again, wherein first
When three-way valve (6) is opened, seepage channel entrance (5) is connected to entrance motor servo pump (7), forms upstream seepage flow circuit；The
When one three-way valve (6) is closed, seepage channel entrance (5) is connected to water storage container (8), forms drain outlet loop；
Infiltration lane outlet (9) on c triaxial chamber pressure head (1) by the second three-way valve (10) and valve (11) respectively with outlet
Motor servo pump (12), air compressor (13) are connected with vacuum pump (14) with stainless steel tube, and Motor Export servopump (12) is again
It is connected with water storage container (8), wherein when the second three-way valve (10) is opened, infiltration lane exports (9) and Motor Export servopump
(12) it is connected to, forms downstream seepage flow circuit；When second three-way valve (10) is closed, infiltration lane exports (9) and air compressor
(13) it is connected to, forms drain inlet circuit；
D closes the first three-way valve (6) and the second three-way valve (10), starts air compressor (13), arranges to inner fluid passage
After to the greatest extent, stop air compressor (13), open the first three-way valve (6) and the second three-way valve (10), opens valve (11), open
Dynamic vacuum pump (14) close valve (11) seepage flow vacuum-pumping loop 10min or more, stop vacuum pump (14)；
E starts entrance motor servo pump (7) and Motor Export servopump (12), and is its water-filling, after being full of water, stops entrance electricity
Machine servopump (7) and Motor Export servopump (12) terminate water filling process, record two motor servos and pump interior initial fluid volumeWith
F opens confining pressure valve (15), applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, to confining pressure and deform constant
Afterwards, bias valve (16) are opened, is biased σ3-σ1；
It is respectively P that g inlet porting motor servo, which pumps (7) and the pressure value of Motor Export servopump (12),inAnd Pout, start simultaneously
Two motor servo pumps, when the fluid volume reading of Motor Export servopump (12) starts to significantly increase, stopping motor servo being pumped,
Entrance motor servo pumps the fluid volume in (7) and Motor Export servopump (12) to record at this timeWithThus worked as
The consume fluid volume V in seepage flow circuit under the conditions of preceding triaxial stress and pore pressureu:
I.e.
Under the conditions of triaxial stress and pore pressure reservoir porous rock porosity with permeability while test
H takes out standard cylindrical steel sample out of sealing sleeve pipe, and change diameter D is 50 ± 1mm, and height H is the standard of 100 ± 2mm
Cylinder rock sample, standard cylinder rock sample upper and lower end face place infiltration gasket, sealing sleeve pipe are fixed in triaxial chamber
Between pressure head (1) and pedestal (2), LVDT (3) are installed between pressure head (1) and pedestal (2), are installed laterally among sealing sleeve pipe
Deformation gauge (4) acquires axial deformation and transversely deforming data in standard cylinder rock sample loading procedure respectively；
I closes the first three-way valve (6) and the second three-way valve (10), starts air compressor (13), arranges to inner fluid passage
After to the greatest extent, stop air compressor (13), open the first three-way valve (6) and the second three-way valve (10), opens valve (11), open
Dynamic vacuum pump (14) close valve (11) seepage flow vacuum-pumping loop 10min or more, stop vacuum pump (14), record entry electricity
The initial fluid volume of machine servopump (7) and Motor Export servopump (12)With
J opens confining pressure valve (15), applies confining pressure to σ to standard cylinder rock sample uniform speed slow3, to confining pressure and deform constant
Afterwards, bias valve (16) are opened, is biased σ3-σ1；
It is respectively P that k inlet porting motor servo, which pumps (7) and the pressure value of Motor Export servopump (12),inAnd Pout, start simultaneously
Two motor servo pumps, when the fluid volume of Motor Export servopump (12) reading, which starts to stablize, to be increased, seepage stability, respectively
Record time t1And t2Fluid volume in the entrance motor servo pump (7) at moment and the pump of Motor Export servopump (12)WithThus it obtains:
Porosity
Wherein, VpFor pore volume:
VuThe consume in seepage flow circuit under the conditions of the triaxial stress and pore pressure for being obtained for above-mentioned consume fluid volume calibration process
Fluid volume,
V is the volume of standard cylinder rock sample: V=π D2H/4,
Permeability k=v μ H/ Δ P formula three
Wherein, v is flow velocity:
A is the cross-sectional area of standard cylinder rock sample: A=π D2/ 4,
Δ t is the period: Δ t=t2-t1,
μ is seepage flow fluid viscous coefficient,
Δ P is permeable pressure head: Δ P=Pin-Pout。
2. porous rock porosity and permeability are tested under the conditions of triaxial stress as described in claim 1 and pore pressure simultaneously
Method, it is characterised in that: the scale of the described entrance motor servo pump (7) and Motor Export servopump (12) is accurate to 10- 3mm3And fluid volume data in pump can be acquired.
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