CN107014731B - A kind of drive of hypotonic rock gas-liquid two pressure pulse decaying permeability test method - Google Patents
A kind of drive of hypotonic rock gas-liquid two pressure pulse decaying permeability test method Download PDFInfo
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- CN107014731B CN107014731B CN201710196097.1A CN201710196097A CN107014731B CN 107014731 B CN107014731 B CN 107014731B CN 201710196097 A CN201710196097 A CN 201710196097A CN 107014731 B CN107014731 B CN 107014731B
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- 239000011435 rock Substances 0.000 title claims abstract description 109
- 239000007788 liquid Substances 0.000 title claims abstract description 41
- 230000035699 permeability Effects 0.000 title claims abstract description 33
- 238000010998 test method Methods 0.000 title claims description 8
- 239000012530 fluid Substances 0.000 claims abstract description 41
- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000001764 infiltration Methods 0.000 claims abstract description 20
- 230000008595 infiltration Effects 0.000 claims abstract description 20
- 238000002474 experimental method Methods 0.000 claims abstract description 9
- 230000007613 environmental effect Effects 0.000 claims abstract description 7
- 238000006073 displacement reaction Methods 0.000 claims description 25
- 238000005538 encapsulation Methods 0.000 claims description 6
- 239000011148 porous material Substances 0.000 claims description 6
- 230000001133 acceleration Effects 0.000 claims description 5
- 230000005484 gravity Effects 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 238000009434 installation Methods 0.000 claims description 4
- 230000008602 contraction Effects 0.000 claims description 3
- 229920006395 saturated elastomer Polymers 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 abstract description 9
- 238000005259 measurement Methods 0.000 abstract description 7
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 22
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000011067 equilibration Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 238000009738 saturating Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000012512 characterization method Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 239000003643 water by type Substances 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
Classifications
-
- 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
Abstract
A kind of hypotonic rock gas-liquid two drives pressure pulse decaying infiltration experiment device and method, device includes that gas-liquid two drives formula fluid charging assembly, confining pressure pump, pressure chamber, differential pressure pickup, pressure sensor, several shut-off valves, pressure regulator valve, vacuum pump, auxiliary heater and water bath with thermostatic control, gas-liquid two drives formula fluid charging assembly and had not only been able to satisfy liquid output but also had been able to satisfy gas output, in hypotonic rock permeability test, can biggish pressure difference actively be established in the upstream and downstream of hypotonic rock, mentality of designing based on pressure pulse damped method simultaneously, it is capable of the permeability and infiltration coefficient of rapid survey hypotonic rock；Experimental rig manifold volume established by the present invention is smaller, it is less than 300ml through practical measuring and calculating, the influence that environmental temperature fluctuation will generate manifold volume can be effectively reduced, simultaneously in conjunction with water bath with thermostatic control and auxiliary heater, the accurate control to environment temperature can be realized again, the influence that environmental temperature fluctuation will generate manifold volume is further decreased, measurement accuracy is finally improved.
Description
Technical field
The invention belongs to hypotonic rock permeability test technical fields, drive pressure more particularly to a kind of hypotonic rock gas-liquid two
Impulse attenuation infiltration experiment device and method.
Background technique
Shale gas belongs to one kind of unconventional energy resource, can be free in shale gas with various states preservation in hydrocarbon source rock
Mobile free gas is about 50%, and residual gas mostly exists with adsorbed state and dissolved state.Further, since reservoir matrix has
There is porous hypotonic characteristic, shale gas is caused to migrate difficult in reservoir matrix and be difficult to exploit.The penetrating power of shale is characterization
The important indicator parameter of shale gas migration easy degree, realizes the precise measurement of shale penetrating power, assesses well logging and carry out
Capability forecasting has great influence.
Currently, traditional pressure differential method rock steady-state permeation test is only applicable to the higher rock of permeability, and for as page
For hypotonic rock as rock, it is desirable to measure its permeability, establish darcy steady-flow and at least need even several weeks a couple of days
Time, and the changes in flow rate of upstream and downstream is small, and existing flowmeter accuracy level is extremely difficult to measurement request.Therefore, hypotonic
Rock is that will receive very big limitation carrying out traditional pressure differential method rock steady-state permeation test.
Further more, temperature is also the important ring for influencing measurement accuracy during the permeability survey of the hypotonic rocks such as shale
One of border factor, it is lesser by Boyle's law it is found that under high pressure since the manifold volume of existing experimental rig is big
Environmental temperature fluctuation will produce a very large impact manifold volume, and then influence the control and survey of the parameters such as pressure and flow indirectly
Amount.Therefore, the manifold volume for how reducing measuring device is also a problem to be solved.
Therefore, for time of measuring present in existing hypotonic rock permeability test, long, manifold volume is greatly and measurement is smart
Low problem is spent, needs to research and develop a kind of completely new hypotonic rock infiltration experiment device and method.
Summary of the invention
In view of the problems of the existing technology, the present invention provides a kind of drive of hypotonic rock gas-liquid two pressure pulse decaying infiltration
Experimental rig and method have the characteristics that time of measuring is short, manifold volume is small and measurement accuracy is high.
To achieve the goals above, the present invention adopts the following technical scheme: a kind of hypotonic rock gas-liquid two drives pressure pulse
Decaying infiltration experiment device, including gas-liquid two drive formula fluid charging assembly, confining pressure pump, pressure chamber, differential pressure pickup, pressure sensing
Device, the first shut-off valve, the second shut-off valve, third shut-off valve, the 4th shut-off valve, the 5th shut-off valve, the first pressure regulator valve, the second pressure regulation
Valve and water bath with thermostatic control are respectively equipped with confining pressure entrance, confining pressure outlet, pulse entrance and pulse in the pressure chamber and go out
Mouthful, temperature thermocouple is added in pressure chamber；
The fluid outlet that the gas-liquid two drives formula fluid charging assembly passes sequentially through the first shut-off valve and the second cut-off all the way
Valve is connected with the pulse entrance of pressure chamber, and another way passes sequentially through the first shut-off valve, third shut-off valve, pressure sensor
And the 4th the pulse outlet of shut-off valve and pressure chamber be connected；
The outlet of the confining pressure pump is connected by the 5th shut-off valve with the confining pressure entrance of pressure chamber, and the confining pressure of pressure chamber goes out
Mouth is connected with the first pressure regulator valve；
Described differential pressure pickup one end is connected on the pipeline between pressure sensor and the 4th shut-off valve, differential pressure pickup
The other end is connected on the pipeline between the second shut-off valve and third shut-off valve；
Second pressure regulator valve is connected on the pipeline between pressure sensor and third shut-off valve；
The pressure chamber, differential pressure pickup, pressure sensor, the first shut-off valve, the second shut-off valve, third shut-off valve,
Four shut-off valves, the 5th shut-off valve, the first pressure regulator valve, the second pressure regulator valve and its between connecting line be respectively positioned in water bath with thermostatic control.
It includes gas cylinder, water tank, booster pump, water pump, pressure reducing valve, the 6th cut-off that the gas-liquid two, which drives formula fluid charging assembly,
Valve, the 7th shut-off valve, displacement pump, the 8th shut-off valve, relief valve and auxiliary heater；
The gas cylinder passes sequentially through booster pump, pressure reducing valve and the 6th shut-off valve and is connected with the entrance that displacement pumps, the water
Case passes sequentially through water pump and the 7th shut-off valve is connected with the entrance that displacement pumps, and the outlet of displacement pump passes sequentially through the 8th shut-off valve
And auxiliary heater is connected with the first shut-off valve；
The relief valve is connected on the pipeline between the 8th shut-off valve and auxiliary heater, in the 8th shut-off valve and auxiliary
Pressure gauge is installed on pipeline between heater.
It further includes vacuum pump and the 9th shut-off valve that the gas-liquid two, which drives formula fluid charging assembly, and the 9th shut-off valve is connected to the
On pipeline between eight shut-off valves and auxiliary heater, the air entry of vacuum pump is connected with the 9th shut-off valve.
The first constant volume high-pressure bottle is connected on pipeline between second shut-off valve and third shut-off valve, described
The second constant volume high-pressure bottle is connected on pipeline between pressure sensor and third shut-off valve.
Third constant volume high-pressure bottle is in series on the first constant volume high-pressure bottle, in the first constant volume high-pressure bottle and third
The tenth shut-off valve is provided between constant volume high-pressure bottle；The 4th high pressure-volume of constant volume is in series on the second constant volume high-pressure bottle
Device is provided with the 11st shut-off valve between the second constant volume high-pressure bottle and the 4th constant volume high-pressure bottle.
A kind of drive of hypotonic rock gas-liquid two pressure pulse decaying permeability test method, using the hypotonic rock gas-liquid
Two drive pressure pulse decaying infiltration experiment device, include the following steps:
Step 1: encapsulation rock sample
Rock sample surface is cleaned first, then rock sample is placed between two pressing plates, while the mounting hole between rock sample and pressing plate
Then thermal shrinkable sleeve is sleeved on the outside of rock sample, orifice plate and pressing plate by plate, finally heated thermal shrinkable sleeve makes its contraction, until rock sample, orifice plate
And pressing plate is by thermal shrinkable sleeve environmental sealing；
Step 2: installation rock sample
Rock sample after encapsulation is placed in pressure chamber, while the pulse entrance of pressure chamber is connect by one side plate of rock sample
Enter rock sample, the pulse outlet of pressure chamber accesses rock sample by another side plate, then confining pressure room；
Step 3: it vacuumizes
The 9th shut-off valve is opened, the 8th shut-off valve and relief valve are closed, opens the first shut-off valve, the second shut-off valve, third
Shut-off valve, the 4th shut-off valve, the tenth shut-off valve and the 11st shut-off valve close the 5th shut-off valve, the first pressure regulator valve and the second tune
Then pressure valve starts vacuum pump, carry out vacuumizing operation to pressure chamber and connecting line；
Step 4: confining pressure load
The 5th shut-off valve and the first pressure regulator valve are opened, confining pressure pump is then started, confining pressure load is carried out to the rock sample of pressure chamber；
Step 5: rock sample saturation
The 8th shut-off valve is opened, under initial setup pressure value, liquid or gas is selected to be saturated rock sample；
When select liquid carry out rock sample saturation when, close the 6th shut-off valve, open the 7th shut-off valve, then start water pump and
Displacement pump, the hold-up until completing rock sample；
When selecting gas to carry out rock sample saturation, the 7th shut-off valve is closed, the 6th shut-off valve is opened, is then turned on gas cylinder,
Start booster pump and displacement pump, the gas saturation until completing rock sample；
Step 6: pulse load
The second shut-off valve and third shut-off valve are closed, fluid is continued to output by displacement pump, until completing upstream
Pulse load, and the constant volume high-pressure bottle quantity of access is selected according to actual needs；
Step 7: release pulse
The second shut-off valve is opened, realizes the pulse release of upstream, until the upstream and downstream pressure recovery of rock sample is flat
Weighing apparatus；
Step 8: data acquisition and computing permeability
Data are acquired by differential pressure pickup and pressure sensor, and send data to computer, are given birth in a computer
The logarithmic curve changed over time at pressure difference, while permeability and infiltration coefficient are calculated, and data acquisition time is upstream and downstream
The 10%~50% of pressure recovery equilibration time, time range is in 20s~1.5h；
Step 9: pore pressure unloading
Third shut-off valve is opened, first passes through displacement pump for the discharge degree in pipeline to 50Pa hereinafter, then by second
Pressure regulator valve discharges the fluid in pipeline, completes the unloading of pore pressure；
Step 10: confining pressure unloading
It first passes through confining pressure pump and the indoor confining pressure of pressure is offloaded to 50Pa hereinafter, then passing through the first pressure regulator valve for pressure chamber
Interior fluid release, completes the unloading of confining pressure.
In step 4, the confining pressure of load is determined by calculation, and calculation formula is as follows:
In formula, PcFor confining pressure, μ is Poisson's ratio, and D is depth selection, PgraFor barometric gradient.
In step 8, permeability and infiltration coefficient are calculated by the following formula:
In formula, PuFor upstream pressure, PeFor pressure after upstream and downstream balance, Δ P is pulse, V1For upstream volume,
V2For downstream pipe volume, t is the die-away time of pulse, and θ is upstream pressure versus time curve slope, and K is to seep
Saturating coefficient, A are rock sample sectional area, μfFor fluid coefficient of viscosity, CfFor fluid compressibility, L is rock sample length, and k is permeability, ρ
For fluid density, g is acceleration of gravity.
Beneficial effects of the present invention:
The present invention has fully met the infiltration examination of hypotonic rock compared with traditional pressure differential method rock steady-state permeation test
It tests, actively can establish biggish pressure difference in the upstream and downstream of hypotonic rock, while thinking based on the design of pressure pulse damped method
Road realizes the permeability of hypotonic rock and the rapid survey of infiltration coefficient.
The present invention establishes the fluid output mode that gas-liquid two drives formula, only needs same set of experimental rig, is both able to satisfy and is based on
The hypotonic rock permeability test of liquid, and it is able to satisfy the hypotonic rock permeability test based on gas, effectively extend experimental rig
Use scope.
The manifold volume of experimental rig established by the present invention is smaller, is less than 300ml through practical measuring and calculating, effectively reduces ring
The influence that border temperature fluctuation will generate manifold volume, while in conjunction with water bath with thermostatic control and auxiliary heater, and realize to ring
The accurate control of border temperature further reduces the influence that environmental temperature fluctuation will generate manifold volume, finally improves survey
Accuracy of measurement.
Detailed description of the invention
Fig. 1 is that a kind of hypotonic rock gas-liquid two of the invention drives pressure pulse decaying infiltration experiment device schematic diagram；
Fig. 2 is the scheme of installation of rock sample and pressure chamber；
In figure, 1-confining pressure pump, 2-pressure chambers, 3-differential pressure pickups, 4-pressure sensors, the 5-the first shut-off valve,
6-the second shut-off valve, 7-third shut-off valves, the 8-the four shut-off valve, the 9-the five shut-off valve, the 10-the first pressure regulator valve, 11-the
Two pressure regulator valves, 12-waters bath with thermostatic control, 13-gas cylinders, 14-water tanks, 15-booster pumps, 16-water pumps, 17-pressure reducing valves, 18-the
Six shut-off valves, the 19-the seven shut-off valve, 20-displacements pump, the 21-the eight shut-off valve, 22-relief valves, 23-auxiliary heaters,
24-pressure gauges, 25-vacuum pumps, the 26-the nine shut-off valve, the 27-the first constant volume high-pressure bottle, the high pressure-volume of the 28-the second constant volume
Device, 29-third constant volume high-pressure bottles, the 30-the four constant volume high-pressure bottle, the 31-the ten shut-off valve, the 32-the ten one shut-off valve,
33-rock samples, 34-pressing plates, 35-orifice plates, 36-thermal shrinkable sleeves.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of hypotonic rock gas-liquid two drives pressure pulse decaying infiltration experiment device, including gas-liquid two drives formula
Fluid charging assembly, confining pressure pump 1, pressure chamber 2, differential pressure pickup 3, pressure sensor 4, the first shut-off valve 5, the second shut-off valve 6,
Third shut-off valve 7, the 4th shut-off valve 8, the 5th shut-off valve 9, the first pressure regulator valve 10, the second pressure regulator valve 11 and water bath with thermostatic control 12,
Confining pressure entrance, confining pressure outlet, pulse entrance and pulse outlet are respectively equipped in the pressure chamber 2, in pressure chamber 2
Inside add temperature thermocouple；
The fluid outlet that the gas-liquid two drives formula fluid charging assembly passes sequentially through the first shut-off valve 5 and the second cut-off all the way
Valve 6 is connected with the pulse entrance of pressure chamber 2, and another way passes sequentially through the first shut-off valve 5, third shut-off valve 7, pressure and passes
Sensor 4 and the 4th shut-off valve 8 are connected with the outlet of the pulse of pressure chamber 2；
The outlet of the confining pressure pump 1 is connected by the 5th shut-off valve 9 with the confining pressure entrance of pressure chamber 2, and pressure chamber 2 encloses
Mouth is extruded to be connected with the first pressure regulator valve 10；
Described 3 one end of differential pressure pickup is connected on the pipeline between pressure sensor 4 and the 4th shut-off valve 8, and pressure difference passes
3 other end of sensor is connected on the pipeline between the second shut-off valve 6 and third shut-off valve 7；
Second pressure regulator valve 11 is connected on the pipeline between pressure sensor 4 and third shut-off valve 7；
The pressure chamber 2, differential pressure pickup 3, pressure sensor 4, the first shut-off valve 5, the second shut-off valve 6, third cut-off
Valve 7, the 4th shut-off valve 8, the 5th shut-off valve 9, the first pressure regulator valve 10, the second pressure regulator valve 11 and its between connecting line be respectively positioned on perseverance
In tepidarium 12.
The gas-liquid two drive formula fluid charging assembly include gas cylinder 13, water tank 14, booster pump 15, water pump 16, pressure reducing valve 17,
6th shut-off valve 18, the 7th shut-off valve 19, displacement pump the 20, the 8th shut-off valve 21, relief valve 22 and auxiliary heater 23；
The gas cylinder 13 passes sequentially through booster pump 15, pressure reducing valve 17 and the 6th shut-off valve 18 and is connected with the entrance of displacement pump 20
Logical, the water tank 14 passes sequentially through water pump 16 and the 7th shut-off valve 19 and is connected with the entrance of displacement pump 20, and displacement pump 20 goes out
Mouth passes sequentially through the 8th shut-off valve 21 and auxiliary heater 23 and is connected with the first shut-off valve 5；
The relief valve 22 is connected on the pipeline between the 8th shut-off valve 21 and auxiliary heater 23, in the 8th shut-off valve
Pressure gauge 24 is installed on the pipeline between 21 and auxiliary heater 23.
It further includes vacuum pump 25 and the 9th shut-off valve 26 that the gas-liquid two, which drives formula fluid charging assembly, and the 9th shut-off valve 26 connects
It connects on the pipeline between the 8th shut-off valve 21 and auxiliary heater 23, the air entry of vacuum pump 25 is connected with the 9th shut-off valve 26
It is logical.
The first constant volume high-pressure bottle 27 is connected on pipeline between second shut-off valve 6 and third shut-off valve 7,
The second constant volume high-pressure bottle 28 is connected on pipeline between the pressure sensor 4 and third shut-off valve 7.In the present embodiment,
The capacity of first constant volume high-pressure bottle 27 and the second constant volume high-pressure bottle 28 is 100ml；
It is in series with third constant volume high-pressure bottle 29 on the first constant volume high-pressure bottle 27, in the first constant volume high-pressure bottle 27
The tenth shut-off valve 31 is provided between third constant volume high-pressure bottle 29；The 4th is in series on the second constant volume high-pressure bottle 28
Constant volume high-pressure bottle 30 is provided with the 11st shut-off valve between the second constant volume high-pressure bottle 28 and the 4th constant volume high-pressure bottle 30
32.In the present embodiment, the capacity of third constant volume high-pressure bottle 29 and the 4th constant volume high-pressure bottle 30 is 1000ml；
A kind of drive of hypotonic rock gas-liquid two pressure pulse decaying permeability test method, using the hypotonic rock gas-liquid
Two drive pressure pulse decaying infiltration experiment device, include the following steps:
Step 1: encapsulation rock sample
33 surface of rock sample is cleaned first, then rock sample 33 is placed between two pressing plates 34, while in rock sample 33 and pressing plate 34
Between orifice plate 35 is installed, thermal shrinkable sleeve 36 is then sleeved on rock sample 33, orifice plate 35 and the outside of pressing plate 34, finally heated thermal shrinkable sleeve
36 make its contraction, until rock sample 33, orifice plate 35 and pressing plate 34 are by 36 environmental sealing of thermal shrinkable sleeve；In the present embodiment, rock sample 33 is column
Shape rock sample, diameter areLength is 25mm；
Step 2: installation rock sample
As shown in Fig. 2, the rock sample 33 after encapsulation is placed in pressure chamber 2, while the pulse entrance of pressure chamber 2 passes through
33 1 side plate 34 of rock sample accesses rock sample 33, and the pulse outlet of pressure chamber 2 accesses rock sample 33 by another side plate 34, so
Rear enclosed pressure chamber 2；
Step 3: it vacuumizes
The 9th shut-off valve 26 is opened, the 8th shut-off valve 21 and relief valve 22 are closed, opens the cut-off of the first shut-off valve 5, second
Valve 6, third shut-off valve 7, the 4th shut-off valve 8, the tenth shut-off valve 31 and the 11st shut-off valve 32 close the 5th shut-off valve 9, first
Then pressure regulator valve 10 and the second pressure regulator valve 11 start vacuum pump 25, carry out vacuumizing operation to pressure chamber 2 and connecting line；This
In embodiment, pumpdown time 10min, ultimate vacuum pressure reaches 50Pa~100Pa；
Step 4: confining pressure load
The 5th shut-off valve 9 and the first pressure regulator valve 10 are opened, then starts confining pressure pump 1, the rock sample 33 of pressure chamber 2 is enclosed
Pressure load；Wherein, the confining pressure of load is determined by calculation, and calculation formula is as follows:
In formula, PcFor confining pressure, μ is Poisson's ratio, and D is depth selection, PgraFor barometric gradient；In the present embodiment, Poisson's ratio μ
It is 0.2~0.22, depth selection D is 2500m, barometric gradient PgraFor 22.6MPa/km, the confining pressure P being calculatedcFor 25MPa
~30MPa；
Step 5: rock sample saturation
The 8th shut-off valve 21 is opened, under initial setup pressure value, liquid or gas is selected to be saturated rock sample 33；
When selecting liquid to carry out the saturation of rock sample 33, the 6th shut-off valve 18 is closed, the 7th shut-off valve 19 is opened, then starts
Water pump 16 and displacement pump 20, the hold-up until completing rock sample 33；In the present embodiment, liquid is water, initial setup pressure value
For 10MPa, saturation time is 3 days, saturation pressure 10MPa；
When selecting gas to carry out the saturation of rock sample 33, the 7th shut-off valve 19 is closed, the 6th shut-off valve 18 is opened, is then turned on
Gas cylinder 13 starts booster pump 15 and displacement pump 20, the gas saturation until completing rock sample 33；In the present embodiment, gas is nitrogen,
Initial setup pressure value is 8MPa, and saturation time is 8 hours, saturation pressure 10MPa；
Step 6: pulse load
The second shut-off valve 6 and third shut-off valve 7 are closed, fluid is continued to output by displacement pump 20, until completing upstream tube
The pulse on road loads, and selects the constant volume high-pressure bottle quantity of access according to actual needs；In the present embodiment, the tenth is closed
Shut-off valve 31 and the 11st shut-off valve 32 only access the first constant volume high-pressure bottle 27 and the second constant volume high-pressure bottle 28；
Step 7: release pulse
The second shut-off valve 6 is opened, the pulse release of upstream is realized, until the upstream and downstream pressure recovery of rock sample 33
Balance；
Step 8: data acquisition and computing permeability
Data are acquired by differential pressure pickup 3 and pressure sensor 4, and send data to computer, in a computer
The logarithmic curve that pressure difference changes over time is generated, while calculating permeability and infiltration coefficient, and data acquisition time is upper and lower
The 10%~50% of pressure recovery equilibration time is swum, time range is in 20s~1.5h；Wherein, permeability and infiltration coefficient pass through
Following formula is calculated:
In formula, PuFor upstream pressure, PeFor pressure after upstream and downstream balance, Δ P is pulse, V1For upstream volume,
V2For downstream pipe volume, t is the die-away time of pulse, and θ is upstream pressure versus time curve slope, and K is to seep
Saturating coefficient, A are rock sample sectional area, μfFor fluid coefficient of viscosity, CfFor fluid compressibility, L is rock sample length, and k is permeability, ρ
For fluid density, g is acceleration of gravity；
When selecting liquid to carry out the saturation of rock sample 33, in the present embodiment, upstream pressure PuFor 10.2MPa, upstream and downstream balance
Pressure P afterwardseIt is 0.2MPa, upstream volume V for 10.1MPa, pulse Δ P1It is 2 × 10-6m3, downstream pipe volume V2
It is 2 × 10-6m3, the die-away time t of pulse is 2.4 × 102S, upstream pressure versus time curve slope θ are 38 °,
Coefficient of permeability K is 9.8 × 10-10M/s, rock sample sectional area A are 4.909 × 10-4m2, fluid coefficient of viscosity μfIt is 1 × 10-3pa·
S, fluid compressibility CfIt is 4.2 × 10-10Pa-1, rock sample length L is 25mm, and permeability k is 1 × 10-16m2, fluid density ρ is
1×103kg/m3, gravity acceleration g 9.8m/s2；
When selecting gas to carry out the saturation of rock sample 33, in the present embodiment, upstream pressure PuFor 10.2MPa, upstream and downstream balance
Pressure P afterwardseIt is 0.2MPa, upstream volume V for 10.1MPa, pulse Δ P1It is 2 × 10-6m3, downstream pipe volume V2
It is 2 × 10-6m3, the die-away time t of pulse is 5.3 × 103S, upstream pressure versus time curve slope θ are 32 °,
Coefficient of permeability K is 1.244 × 10-11M/s, rock sample sectional area A are 4.909 × 10-4m2, fluid coefficient of viscosity μfIt is 1.78 × 10- 5Pas, fluid compressibility CfIt is 9.8 × 10-7Pa-1, rock sample length L is 25mm, and permeability k is 2 × 10-17m2, fluid is close
Degree ρ is 1.13kg/m3, gravity acceleration g 9.8m/s2；
Step 9: pore pressure unloading
Third shut-off valve 7 is opened, first passes through displacement pump 20 for the discharge degree in pipeline to 50Pa hereinafter, then by the
Two pressure regulator valves 11 discharge the fluid in pipeline, complete the unloading of pore pressure；
Step 10: confining pressure unloading
It first passes through confining pressure pump 1 and the confining pressure in pressure chamber 2 is offloaded to 50Pa hereinafter, then will pressure by the first pressure regulator valve 10
The indoor fluid release of power, completes the unloading of confining pressure.
The scope of patent protection that scheme in embodiment is not intended to limit the invention, it is all without departing from carried out by the present invention etc.
Effect implements or change, is both contained in the scope of the patents of this case.
Claims (3)
1. a kind of hypotonic rock gas-liquid two drives pressure pulse decaying permeability test method, uses hypotonic rock gas-liquid two and drive pressure
Impulse attenuation infiltration experiment device, experimental rig include that gas-liquid two drives formula fluid charging assembly, confining pressure pump, pressure chamber, pressure difference biography
Sensor, pressure sensor, the first shut-off valve, the second shut-off valve, third shut-off valve, the 4th shut-off valve, the 5th shut-off valve, first are adjusted
Pressure valve, the second pressure regulator valve and water bath with thermostatic control are respectively equipped with confining pressure entrance in the pressure chamber, confining pressure exports, pulse enters
Mouth and pulse outlet, add temperature thermocouple in pressure chamber；The gas-liquid two drives the fluid of formula fluid charging assembly
Outlet passes sequentially through the first shut-off valve and the second shut-off valve all the way and is connected with the pulse entrance of pressure chamber, and another way is successively
It is connected by the first shut-off valve, third shut-off valve, pressure sensor and the 4th shut-off valve with the outlet of the pulse of pressure chamber；
The outlet of the confining pressure pump is connected by the 5th shut-off valve with the confining pressure entrance of pressure chamber, the confining pressure outlet and first of pressure chamber
Pressure regulator valve is connected；Described differential pressure pickup one end is connected on the pipeline between pressure sensor and the 4th shut-off valve, pressure difference
The sensor other end is connected on the pipeline between the second shut-off valve and third shut-off valve；Second pressure regulator valve is connected to pressure
On pipeline between sensor and third shut-off valve；The pressure chamber, differential pressure pickup, pressure sensor, the first shut-off valve,
Two shut-off valves, third shut-off valve, the 4th shut-off valve, the 5th shut-off valve, the first pressure regulator valve, the second pressure regulator valve and its between connecting tube
Road is respectively positioned in water bath with thermostatic control；It includes gas cylinder, water tank, booster pump, water pump, decompression that the gas-liquid two, which drives formula fluid charging assembly,
Valve, the 6th shut-off valve, the 7th shut-off valve, displacement pump, the 8th shut-off valve, relief valve and auxiliary heater；The gas cylinder successively leads to
It crosses booster pump, pressure reducing valve and the 6th shut-off valve to be connected with the entrance that displacement pumps, the water tank passes sequentially through water pump and the 7th section
Only valve is connected with the entrance that displacement pumps, and the outlet of displacement pump passes sequentially through the 8th shut-off valve and auxiliary heater and the first cut-off
Valve is connected；The relief valve is connected on the pipeline between the 8th shut-off valve and auxiliary heater, the 8th shut-off valve with it is auxiliary
It helps on the pipeline between heater and pressure gauge is installed；It further includes vacuum pump and the 9th that the gas-liquid two, which drives formula fluid charging assembly,
Shut-off valve, the 9th shut-off valve are connected on the pipeline between the 8th shut-off valve and auxiliary heater, the air entry of vacuum pump and
Nine shut-off valves are connected；The high pressure-volume of the first constant volume is connected on pipeline between second shut-off valve and third shut-off valve
Device is connected with the second constant volume high-pressure bottle on the pipeline between the pressure sensor and third shut-off valve；Described first is fixed
Hold and be in series with third constant volume high-pressure bottle on high-pressure bottle, is set between the first constant volume high-pressure bottle and third constant volume high-pressure bottle
It is equipped with the tenth shut-off valve；It is in series with the 4th constant volume high-pressure bottle on the second constant volume high-pressure bottle, in the high pressure-volume of the second constant volume
The 11st shut-off valve is provided between device and the 4th constant volume high-pressure bottle；It is characterized by: test method includes the following steps:
Step 1: encapsulation rock sample
Rock sample surface is cleaned first, then rock sample is placed between two pressing plates, while orifice plate being installed between rock sample and pressing plate, so
Thermal shrinkable sleeve is sleeved on the outside of rock sample, orifice plate and pressing plate afterwards, finally heated thermal shrinkable sleeve makes its contraction, until rock sample, orifice plate and pressure
Plate is by thermal shrinkable sleeve environmental sealing；
Step 2: installation rock sample
Rock sample after encapsulation is placed in pressure chamber, while the pulse entrance of pressure chamber accesses rock by one side plate of rock sample
The pulse outlet of sample, pressure chamber accesses rock sample by another side plate, then confining pressure room；
Step 3: it vacuumizes
The 9th shut-off valve is opened, the 8th shut-off valve and relief valve are closed, opens the first shut-off valve, the second shut-off valve, third cut-off
Valve, the 4th shut-off valve, the tenth shut-off valve and the 11st shut-off valve close the 5th shut-off valve, the first pressure regulator valve and the second pressure regulator valve,
Then start vacuum pump, pressure chamber and connecting line are carried out vacuumizing operation；
Step 4: confining pressure load
The 5th shut-off valve and the first pressure regulator valve are opened, confining pressure pump is then started, confining pressure load is carried out to the rock sample of pressure chamber；
Step 5: rock sample saturation
The 8th shut-off valve is opened, under initial setup pressure value, liquid or gas is selected to be saturated rock sample；
When selecting liquid to carry out rock sample saturation, the 6th shut-off valve is closed, opens the 7th shut-off valve, then starts water pump and displacement
Pump, the hold-up until completing rock sample；
When selecting gas to carry out rock sample saturation, the 7th shut-off valve is closed, the 6th shut-off valve is opened, is then turned on gas cylinder, is started
Booster pump and displacement pump, the gas saturation until completing rock sample；
Step 6: pulse load
The second shut-off valve and third shut-off valve are closed, fluid is continued to output by displacement pump, until completing the pulse of upstream
Pressure-loaded, and the constant volume high-pressure bottle quantity of access is selected according to actual needs；
Step 7: release pulse
The second shut-off valve is opened, realizes the pulse release of upstream, until the upstream and downstream pressure recovery of rock sample balances；
Step 8: data acquisition and computing permeability
Data are acquired by differential pressure pickup and pressure sensor, and send data to computer, generate pressure in a computer
The logarithmic curve that difference changes over time, while permeability and infiltration coefficient are calculated, and data acquisition time is upstream and downstream pressure
Restore balance the 10%~50% of the time, time range is in 20s~1.5h；
Step 9: pore pressure unloading
Third shut-off valve is opened, first passes through displacement pump for the discharge degree in pipeline to 50Pa hereinafter, then by the second pressure regulation
Valve discharges the fluid in pipeline, completes the unloading of pore pressure；
Step 10: confining pressure unloading
It first passes through confining pressure pump and the indoor confining pressure of pressure is offloaded to 50Pa hereinafter, then by the first pressure regulator valve that pressure is indoor
Fluid release, completes the unloading of confining pressure.
2. a kind of hypotonic rock gas-liquid two according to claim 1 drives pressure pulse decaying permeability test method, feature
Be: in step 4, the confining pressure of load is determined by calculation, and calculation formula is as follows:
In formula, PcFor confining pressure, μ is Poisson's ratio, and D is depth selection, PgraFor barometric gradient.
3. a kind of hypotonic rock gas-liquid two according to claim 1 drives pressure pulse decaying permeability test method, feature
Be: in step 8, permeability and infiltration coefficient are calculated by the following formula:
In formula, PuFor upstream pressure, PeFor pressure after upstream and downstream balance, Δ P is pulse, V1For upstream volume, V2For
Downstream pipe volume, t are the die-away time of pulse, and θ is upstream pressure versus time curve slope, and K is infiltration system
Number, A are rock sample sectional area, μfFor fluid coefficient of viscosity, CfFor fluid compressibility, L is rock sample length, and k is permeability, and ρ is stream
Volume density, g are acceleration of gravity.
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