CN110296921A - The test device and test method of steady state method shale gas permeability under reservoir conditions - Google Patents
The test device and test method of steady state method shale gas permeability under reservoir conditions Download PDFInfo
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- CN110296921A CN110296921A CN201810235954.9A CN201810235954A CN110296921A CN 110296921 A CN110296921 A CN 110296921A CN 201810235954 A CN201810235954 A CN 201810235954A CN 110296921 A CN110296921 A CN 110296921A
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- 238000012360 testing method Methods 0.000 title claims abstract description 90
- 230000035699 permeability Effects 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000010998 test method Methods 0.000 title claims abstract description 23
- 238000002347 injection Methods 0.000 claims abstract description 44
- 239000007924 injection Substances 0.000 claims abstract description 44
- 239000011435 rock Substances 0.000 claims description 38
- 238000004891 communication Methods 0.000 claims description 8
- 238000005086 pumping Methods 0.000 claims description 2
- 239000004575 stone Substances 0.000 abstract description 7
- 230000008901 benefit Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 47
- 238000002474 experimental method Methods 0.000 description 10
- 239000012530 fluid Substances 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 230000010355 oscillation Effects 0.000 description 6
- 238000009738 saturating Methods 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 4
- 238000011160 research Methods 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 3
- 230000008595 infiltration Effects 0.000 description 3
- 238000001764 infiltration Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000011144 upstream manufacturing Methods 0.000 description 3
- 238000011161 development Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000001788 irregular Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000009514 concussion Effects 0.000 description 1
- 238000007418 data mining Methods 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012067 mathematical method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 238000007789 sealing Methods 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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- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
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- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
Abstract
The invention discloses the test devices and test method of steady state method shale gas permeability under a kind of reservoir conditions.The test device includes: insulating box；Main body module includes that core holding unit, the differential pressure pickup connecting with core holding unit both ends, the first intermediate receptacle and the second intermediate receptacle, main body module are set in insulating box；Injection module is connected to the entrance of core holding unit；One end of adjustment module is connect with the first intermediate receptacle, and the other end of adjustment module is connect with the second intermediate receptacle；Confining pressure automatically tracks pump and is connected with core holding unit, and tracking adjusts the confining pressure of core holding unit；Back-pressure valve is set to the outlet of core holding unit；Flowmeter is connected by pipeline with the outlet of back-pressure valve and core holding unit；Data acquisition module is used for the test data of collecting test device.The advantage is that: carrying out the test of high permeability and low-permeability simultaneously, equipment investment has been saved, and has guaranteed hypertonic and permeability of low-leakage stone measuring accuracy.
Description
Technical field
The present invention relates to the experimental facilities of oil-gas field development experiment and method fields, more particularly, to a kind of reservoir item
The test device and test method of steady state method shale gas permeability under part.
Background technique
In recent years, shale gas reservoir because its is resourceful, have a high potential due to have become a hot topic of research.Permeability size is for grinding
Study carefully the shale gas development phase and feature is of great significance.For matrix shale, on the one hand, since nano-pore is developed, hole
Porosity and permeability are extremely low, and traditional test methods are difficult to its permeability of Accurate Determining；On the other hand, shale intrinsic fracture is developed,
Seam net system caused by artificial fracturing significantly increases the fluid ability of near wellbore zone gas, and rock permeability significantly increases
Add, therefore shale permeability overall performance is Analysis On Multi-scale Features.
Shale permeability test method can be divided into steady state method and cold store enclosure.Steady state method uses darcy flow law, works as stream
The pressure difference, flow and combination other parameters that dynamic state reaches steady Timing measurement rock core both ends calculate permeability, this method principle letter
Single, experiment flow is easy to set up, and gas or liquid can be used as flow media, steady state method can be used as other permeability test sides
The scaling method of method.Steady state method has the applicating history in more than 50 years, has played in terms of middle and high infiltration core permeability test important
Effect, however carry out tight rock permeability test when, micrometeor measuring difficulties, stablize the time it is long the problems such as constrain the party
The application of method.
Cold store enclosure compensates for the deficiency of steady state method, can test pole low-permeability, do not need direct measuring flow and reality
It is relatively short to test the time.Cold store enclosure mainly includes pulse attenuation method, pressure-decay method, pressure oscillations method and live degassing method
Etc., various methods have its scope of application, wherein pulse attenuation method and pressure-decay method using relatively broad.Impulse attenuation
Method is based on one-dimensional and unsteady state seepage theory, tests the attenuation data of pore pressure at any time during rock sample unsteady seepage, so
Calculating analysis is carried out to pressure data using the mathematical methods combination relevant parameter such as parsing, numerical value afterwards, to obtain the infiltration of sample
Saturating rate, this method do not need the exit velocity of record rock sample, and testing efficiency with higher is disadvantageous in that device to sealing
Property, temperature and pressure controling precision it is more demanding, the effect of intrinsic fracture and matrix is difficult to differentiate between in Mathematical treatment at present, it is right
Test error is larger when permeability is lower than 50nD；Irregular bulk sample or graininess sample can be used in pressure-decay method, real
Experiment device is similar with gas method porosity test device, its advantage is that speed is fast, eliminates the influence in crack, for being difficult to be made
The sample of regular shape is more practical, and shortcoming is that reproducibility of results is poor, big by particle size influences and can not load confining pressure.
It can be seen that the multiple dimensioned permeability of shale by above-mentioned analysis to be difficult to be tested with a kind of method, conventional stationarity method
Be typically only capable to measurement higher permeability, when permeability as low as to a certain degree when steady state method flow measurement it is not accurate enough, and unstable state
For fado for testing compared with low-permeability, cold store enclosure is generally difficult to the higher permeabilities such as Accurate Determining Fractured shale, therefore right
It needs to test using different experimental provisions in the sample of different permeabilities.
Based on these understanding, people have had carried out some research the test of shale ultralow permeability at present, test method
It mainly include the unsteady methods such as pressure oscillations method, pulse attenuation method, pressure-decay method.Pressure oscillations method is in the upstream of rock core
End applies specific oscillation pressure (usually pure oscillation), and due to the permeability of sample, the downstream of sample will appear pressure
Response, which is usually expressed as phase delay and amplitude reduces, and measures and is calculated after demarcating some parameters according to respective formula
Permeability, CN106290118A use pressure oscillations method, can carry out rock ultralow permeability under triaxial stress and test.Pulse declines
Subtraction is to apply a pressure pulse suddenly in sample upstream end, and upstream and downstream end moment is caused pressure difference occur, the pressure difference with
Fluid flows and decays, and measurement pressure difference changes with time, and then calculates permeability.CN103163057A is to seep with inert gas
Saturating medium tests tight rock gas permeability using pulse attenuation method, and irregular landwaste can be used in pulse attenuation method
Or particulate samples are tested, device is mainly made of reference chamber and sample room, open valve after gas under differential pressure action from
Reference chamber flows to sample room, and record pressure changes over time data, can acquire the permeability of sample；CN103226089A is used
Particulate samples establish shale matrix permeability test device and method, and this method makes matrix permeability test not by the shadow in crack
It rings；CN106442251A calculates rock core effective permeability using live air content test process data, in terms of data mining
Beneficial exploration is done.
In conclusion more for shale ultralow permeability research at present, test method mainly includes pulse attenuation method, pressure
The power concussion unsteady methods such as method and particle penetration, and the research for hypotonic and hypertonic while test device and method
It is still rare.
Therefore, it is necessary to develop the test device of steady state method shale gas permeability and test side under a kind of reservoir conditions
Method can carry out hypotonic and hypertonic shale permeability test under reservoir conditions simultaneously, save equipment investment, and can guarantee height
The measuring accuracy of infiltration and permeability of low-leakage stone.
Summary of the invention
The invention proposes the test device and test method of steady state method shale gas permeability under a kind of reservoir conditions,
The test that hypotonic and hypertonic shale permeability under reservoir conditions can be carried out simultaneously has been saved equipment investment, and can have been guaranteed
Hypertonic and permeability of low-leakage stone measuring accuracy.
According to an aspect of the invention, it is proposed that under a kind of reservoir conditions steady state method shale gas permeability test dress
It sets, stating test device includes:
Insulating box；
Main body module, the main body module include core holding unit, the pressure difference connecting with core holding unit both ends biography
Sensor, the first intermediate receptacle being connect with the entrance of the core holding unit and with the outlet connection of the core holding unit the
Two intermediate receptacles, the main body module are set in the insulating box；
Injection module, the injection module are connected to the entrance of the core holding unit；
Adjustment module, one end of the adjustment module are connect with first intermediate receptacle, the adjustment module it is another
End is connect with second intermediate receptacle；
Confining pressure automatically tracks pump, and the confining pressure automatically tracks pump and is connected with the core holding unit, adjusts institute for tracking
State the confining pressure of core holding unit；
Back-pressure valve, the back-pressure valve are set to the outlet of the core holding unit；
Flowmeter, the flowmeter are connected by pipeline with the outlet of the back-pressure valve and the core holding unit；
Data acquisition module, the data acquisition module and the differential pressure pickup and the adjustment module communication connection,
For acquiring the test data of the test device.
Preferably, the test device further include:
One end of first valve, first valve is connected by pipeline with the entrance of the core holding unit, the other end
It is connected with evacuator；
Second valve, second valve are set to the outlet of the entrance and the core holding unit of the core holding unit
Between；
Third valve, the third valve be set to first intermediate receptacle and the core holding unit entrance it
Between；
4th valve, the 4th valve be set to second intermediate receptacle and the core holding unit outlet it
Between；
5th valve, the 5th valve are set between the outlet of the core holding unit and the back-pressure valve；
6th valve, the outlet of the core holding unit successively with the 4th valve, the 6th valve, the back pressure
Valve is connected with the flowmeter.
Preferably, the test device further include:
First pressure sensor, the first pressure sensor are connected with second valve；
Second pressure sensor, the second pressure sensor are set to the confining pressure and automatically track pump and rock core folder
Between holder；
The first pressure sensor and the second pressure sensor respectively with the data acquisition module communication connection.
Preferably, the test device further include:
Booster pump, the booster pump are set between the injection module and the entrance of the core holding unit.
Preferably, the injection module is injection gas cylinder.
Preferably, the adjustment module is twin cylinder pump.
According to another aspect of the invention, it is proposed that under a kind of reservoir conditions steady state method shale gas permeability test side
Method, the test method include:
Rock core to be measured is placed in the core holding unit, pump setting tracking pressure difference is automatically tracked by confining pressure, and set
Determine calorstat temperature；
The core holding unit is vacuumized；
Gas is injected to setting pressure to the core holding unit by injection module；
When the rock core to be measured is low-permeability, the injection pressure and back pressure pressure of adjustment module are set, the survey is obtained
Pressure difference that trial assembly is set, pressure, pump discharge and move back pump volume, record the pump discharge and the pressure difference moved back when pump volume is stablized and
Gas flow；
When the rock core to be measured is high permeability, the injection pressure and back pressure pressure of the adjustment module are set, obtains institute
Pressure difference, pressure and the gas flow for stating test device record pressure difference, pressure and the gas stream when gas flow is stablized
Amount.
Preferably, the test method further include:
When setting pressure is not achieved to core holding unit injection gas in injection module, by booster pump to the test
Device pressurization.
Preferably, the tracking pressure difference is 2.5-3.5MPa.
Preferably, the core holding unit is vacuumized and includes:
The 5th valve and the 6th valve are closed, first valve, second valve, the third are opened
Valve and the 4th valve, vacuumize the test device by first valve.
The test device and test method of steady state method shale gas permeability, advantage under a kind of reservoir conditions of the invention
Be: the main component of the device of the invention is set in insulating box, guarantees the accuracy of test device, and can carry out simultaneously
Equipment investment has been saved in the test of high permeability and low-permeability, and can guarantee hypertonic and permeability of low-leakage stone survey
Try precision.
The device of the invention and method have other characteristics and advantages will be in the attached drawing and subsequent tool being incorporated herein
It is stated in detail in body embodiment, these the drawings and specific embodiments are used together to explain specific principle of the invention.
Detailed description of the invention
Exemplary embodiment of the present is described in more detail in conjunction with the accompanying drawings, of the invention is above-mentioned and other
Purpose, feature and advantage will be apparent, wherein in exemplary embodiments of the present invention, identical appended drawing reference is usual
Represent same parts.
Fig. 1 shows steady state method shale gas under a kind of reservoir conditions of an exemplary embodiment according to the present invention and seeps
The schematic diagram of the test device of saturating rate.
Fig. 2 shows steady state method shale gases under a kind of reservoir conditions of an exemplary embodiment according to the present invention to seep
The step flow chart of the test method of saturating rate.
Description of symbols:
1, injection module；2, the first intermediate receptacle；3, the second intermediate receptacle；4, core holding unit；5, back-pressure valve；6, flow
Meter；7, confining pressure automatically tracks pump；8, adjustment module；9, differential pressure pickup；10, first pressure sensor；11, second pressure senses
Device；12, the first valve；13, the second valve；14, third valve；15, the 4th valve；16, the 5th valve；17, the 6th valve；
18, insulating box；19, booster pump.
Specific embodiment
The present invention will be described in more detail below with reference to accompanying drawings.Although showing the preferred embodiment of the present invention in attached drawing,
However, it is to be appreciated that may be realized in various forms the present invention and should not be limited by the embodiments set forth herein.On the contrary, providing
These embodiments are of the invention more thorough and complete in order to make, and can will fully convey the scope of the invention to ability
The technical staff in domain.
The present invention provides a kind of test device of steady state method shale gas permeability under reservoir conditions, the test device packets
It includes:
Insulating box；
Main body module, main body module include core holding unit, the differential pressure pickup and rock that connect with core holding unit both ends
The first intermediate receptacle that the entrance of heart clamp holder connects and the second intermediate receptacle with the outlet connection of core holding unit, main body mould
Block is set in insulating box；
Injection module, injection module are connected to the entrance of core holding unit；
Adjustment module, one end of adjustment module are connect with the first intermediate receptacle, among the other end of adjustment module and second
Container connection；
Confining pressure automatically tracks pump, and confining pressure automatically tracks pump and is connected with core holding unit, adjusts core holding unit for tracking
Confining pressure；
Back-pressure valve, back-pressure valve are set to the outlet of core holding unit；
Flowmeter, flowmeter are connected by pipeline with the outlet of back-pressure valve and core holding unit；
Data acquisition module, data acquisition module and differential pressure pickup and adjustment module communication connection are used for collecting test
The test data of device.
Wherein, differential pressure pick-up is used to measure the pressure difference at rock core both ends to be measured.
Wherein, injection module is injection gas cylinder, and adjustment module is twin cylinder pump.
Wherein, fluid-filled medium in intermediate receptacle can be in conjunction with adjustment module for generating stable gas pressure
Stable high pressure is provided for test device.
Preferably, fluid media (medium) selects gas.
Preferably, test device further include:
One end of first valve, the first valve is connected by pipeline with the entrance of core holding unit, and the other end and evacuation fill
It sets connected；
Second valve, the second valve are set between the outlet of entrance and core holding unit of core holding unit；
Third valve, third valve are set between the first intermediate receptacle and the entrance of core holding unit；
4th valve, the 4th valve are set between the second intermediate receptacle and the outlet of core holding unit；
5th valve, the 5th valve are set between the outlet of core holding unit and back-pressure valve；
6th valve, the outlet of core holding unit are successively connected with the 4th valve, the 6th valve, back-pressure valve and flowmeter.
Preferably, test device further include:
First pressure sensor, first pressure sensor are connected with the second valve；
Second pressure sensor, second pressure sensor are set to confining pressure and automatically track between pump and core holding unit；
First pressure sensor and second pressure sensor respectively with data acquisition module communication connection.
Preferably, test device further include:
Booster pump, booster pump are set between injection module and the entrance of core holding unit.
Under normal conditions, injection module maximum pressure is no more than 15MPa, and actual production pressure is much higher than this pressure, because
This needs increasing pump to carry out additional mechanical supercharging to rock core to be measured.
The main component of the device of the invention is set in insulating box, guarantees the accuracy of test device, by multiple
The operation of the switch of valve can carry out the test of high permeability and low-permeability simultaneously, save equipment investment.
The present invention also provides a kind of test method of steady state method shale gas permeability under reservoir conditions, the test methods
Include:
Rock core to be measured is placed in core holding unit, pump setting tracking pressure difference is automatically tracked by confining pressure, and set perseverance
Temperature of Warm Case；
Core holding unit is vacuumized；
Gas is injected to setting pressure to core holding unit by injection module；
When rock core to be measured is low-permeability, the injection pressure and back pressure pressure of adjustment module are set, test device is obtained
Pressure difference, pressure, pump discharge and pump volume is moved back, record pump discharge and moves back the pressure difference and gas flow when pump volume is stablized；
When rock core to be measured is high permeability, the injection pressure and back pressure pressure of adjustment module are set, test device is obtained
Pressure difference, pressure and gas flow, pressure difference, pressure and gas flow when record gas flow is stablized.
Wherein, when the permeability of rock core to be measured is lower than 0.01mD, rock core to be measured is determined for Low Permeable Cores, rock core presss from both sides
The outlet of holder is using adjustment module metered flow and provides back pressure；When the permeability of rock core to be measured is not less than 0.01mD, sentence
Fixed rock core to be measured is high permeability rock core, and the metering of flow is carried out by back-pressure valve and flowmeter.
Wherein, when carrying out high permeability experiment, intermediate receptacle and adjustment module are combined into back-pressure valve and provide steady pressure.
Further, vacuumizing to core holding unit includes: to close the 5th valve and the 6th valve, opens the first valve extremely
4th valve vacuumizes core holding unit by the first valve, and the first valve is closed after vacuumizing.
Preferably, test method further include:
When setting pressure is not achieved to core holding unit injection gas in injection module, test device is increased by booster pump
Pressure.
Wherein, setting pressure is not achieved when device is filled with experimental gas, can according to need by booster pump to device into
Row pressurization, to reach setting pressure, pressure closes the valve of injection module after reaching setting pressure, and closes the second valve.
Further, the 4th valve is closed, the 5th valve is opened and the 6th valve carries out high permeability experiment.
After experiment, the pressure of emptying device.
Wherein, tracking pressure difference is 2.5-3.5MPa, and the temperature of insulating box is set as experimental temperature, and experimental temperature is according to reservoir item
Depending on part, the experimental temperature of different oil reservoirs is different, and experiment purpose difference also results in the difference of experimental temperature.
Wherein, setting pressure is set generally according to the difference of experiment purpose and reservoir pressure.
The present invention uses set of device, can carry out the permeability test of hypotonic and hypertonic shale simultaneously, high-precision using one
Degree twin cylinder pump realizes the functions such as injection, pressure control and flow measurement simultaneously.When carrying out the test of permeability rock, high-precision is double
Cylinder pump realizes back pressure control and flow measurement function, and can guarantee the measuring accuracy of low discharge；And carry out high permeability rock
When stone is tested, high-precision twin cylinder pump realizes back pressure control function, is measured using flowmeter to larger flow.
Hypertonic and low permeability cores permeability test is realized by above-mentioned setting, has saved equipment investment, and can protect
Demonstrate,prove hypertonic and permeability of low-leakage stone measuring accuracy.
Embodiment 1
Fig. 1 shows steady state method shale gas under a kind of reservoir conditions of an exemplary embodiment according to the present invention and seeps
The schematic diagram of the test device of saturating rate.
As shown in Figure 1, a kind of test device of steady state method shale gas permeability under reservoir conditions is present embodiments provided,
Include:
Insulating box 18；
Main body module, main body module include core holding unit 4, the differential pressure pickup 9 being connect with 4 both ends of core holding unit,
The first intermediate receptacle 2 being connect with the entrance of core holding unit 4 and the second intermediate receptacle with the outlet connection of core holding unit 4
3, main body module is set in insulating box 18；
Injection module 1, injection module 1 are connected to the entrance of core holding unit 4；
Adjustment module 8, one end of adjustment module 8 are connect with the first intermediate receptacle 2, the other end of adjustment module 8 and second
Intermediate receptacle 3 connects；
Confining pressure automatically tracks pump 7, and confining pressure automatically tracks pump 7 and is connected with core holding unit 4, adjusts rock core clamping for tracking
The confining pressure of device 4；
Back-pressure valve 5, back-pressure valve 5 are set to the outlet of core holding unit 4；
Flowmeter 6, flowmeter 6 are connected by pipeline with the outlet of back-pressure valve 5 and core holding unit 4；
Data acquisition module, data acquisition module and 8 communication connection of differential pressure pickup 9 and adjustment module are surveyed for acquiring
The test data that trial assembly is set.
Wherein, injection module 1 is injection gas cylinder, and adjustment module 8 is high-precision twin cylinder pump.
In the present embodiment, the fluid in intermediate receptacle selects high pure nitrogen.
Further, test device further include:
One end of first valve 12, the first valve 12 is connected by pipeline with the entrance of core holding unit 4, the other end and pumping
Empty device is connected；
Second valve 13, the second valve 13 are set between the outlet of entrance and core holding unit 4 of core holding unit 4；
Third valve 14, third valve 14 are set between the first intermediate receptacle 2 and the entrance of core holding unit 4；
4th valve 15, the 4th valve 15 are set between the second intermediate receptacle 3 and the outlet of core holding unit 4；
5th valve 16, the 5th valve 16 are set between the outlet of core holding unit 4 and back-pressure valve 5；
6th valve 17, the outlet of core holding unit 4 successively with the 4th valve 15, the 6th valve 17, back-pressure valve 5 and flow
Meter 6 is connected.
Further, test device further include:
First pressure sensor 10, first pressure sensor 10 are connected with the second valve 13；
Second pressure sensor 11, second pressure sensor 11 be set to confining pressure automatically track pump 7 and core holding unit 4 it
Between；
First pressure sensor 10 and second pressure sensor 11 respectively with data acquisition module communication connection.
Further, test device further include:
Booster pump 19, booster pump 19 are set between injection module 1 and the entrance of core holding unit 4.
Under normal conditions, 1 maximum pressure of injection module is no more than 15MPa, and actual production pressure is much higher than this pressure, because
This needs increasing pump 19 to carry out additional mechanical supercharging to rock core to be measured.
The device main component of the present embodiment is set in insulating box 18, can guarantee the accuracy of test device, simultaneously
The test for carrying out high permeability and low-permeability, has saved equipment investment.
Embodiment 2
Fig. 2 shows steady state method shale gases under a kind of reservoir conditions of an exemplary embodiment according to the present invention to seep
The step flow chart of the test method of saturating rate.
As shown in Fig. 2, a kind of test method of steady state method shale gas permeability under reservoir conditions is present embodiments provided,
Include:
Rock core to be measured is placed in core holding unit 4,7 setting tracking pressure difference of pump is automatically tracked by confining pressure, and set
18 temperature of insulating box；
Core holding unit 4 is vacuumized；
Gas is injected to setting pressure to core holding unit 4 by injection module 1；
When rock core to be measured is low-permeability, the injection pressure and back pressure pressure of adjustment module 8 are set, test device is obtained
Pressure difference, pressure, pump discharge and pump volume is moved back, record pump discharge and moves back the pressure difference and gas flow when pump volume is stablized；
When rock core to be measured is high permeability, the injection pressure and back pressure pressure of adjustment module 8 are set, test device is obtained
Pressure difference, pressure and gas flow, pressure difference, pressure and gas flow when record gas flow is stablized.
In the present embodiment, tracking pressure difference is 3MPa, and the temperature of insulating box 18 is set as 25 DEG C, sets pressure as 0.182MPa.
Vacuumizing to core holding unit 4 includes: to close the 5th valve 16 and the 6th valve 17, opens the first valve 12 to the
Four valves 15 vacuumize core holding unit 4 by the first valve 12, and the first valve 12 is closed after vacuumizing.
Under normal conditions, injection module 1 is to inject the maximum pressure of gas cylinder no more than 15MPa, and actual production pressure is remote
Higher than this pressure, it is therefore desirable to which increasing pump 19 carries out additional mechanical supercharging to rock core to be measured to reach setting pressure.
Wherein, it when carrying out high permeability experiment, needs to close the 4th valve 15, opens the 5th valve 16 and the 6th valve
17。
After experiment, the pressure of emptying device.
The present embodiment tests permeability using steady method, and permeability test device is directly succinct, the accurate journey of test result
Degree depends primarily on the precision of test device entirety pressure-resistant stopping property and measuring device.Use standard sample: permeability for
0.398mD, pressure limit 0.1702-0.2235MPa, are tested by 15-35 DEG C of temperature range.Experimental temperature is set as 25 DEG C,
Pressure is 0.182MPa, and the fluid media (medium) in the present embodiment in intermediate receptacle is high pure nitrogen, measures permeability 0.403mD, accidentally
Difference is 1.25%, meets required precision.
The existing minimum permeability of standard sample is all larger than 0.01mD at present, main lower than the rock core of 0.01mD for permeability
Judged according to device leakproofness and the precision of pressure pump (parallel bars pump).
The test method of the present embodiment enough guarantees hypertonic and permeability of low-leakage stone measuring accuracy.
The embodiment of the present invention is described above, above description is exemplary, and non-exclusive, and also not
It is limited to disclosed embodiment.Without departing from the scope and spirit of embodiment described, for the art
Those of ordinary skill for many modifications and changes are obvious.The selection of term used herein, it is intended to best
Principle, practical application or the improvement to the technology in market of embodiment are explained in ground, or make the other common of the art
Technical staff can understand embodiments disclosed herein.
Claims (10)
1. the test device of steady state method shale gas permeability under a kind of reservoir conditions, which is characterized in that the test device packet
It includes:
Insulating box；
Main body module, the main body module include core holding unit, the differential pressure pickup being connect with the core holding unit both ends,
The first intermediate receptacle for being connect with the entrance of the core holding unit and with the second of the outlet connection of the core holding unit in
Between container, the main body module is set in the insulating box；
Injection module, the injection module are connected to the entrance of the core holding unit；
Adjustment module, one end of the adjustment module are connect with first intermediate receptacle, the other end of the adjustment module with
The second intermediate receptacle connection；
Confining pressure automatically tracks pump, and the confining pressure automatically tracks pump and is connected with the core holding unit, adjusts the rock for tracking
The confining pressure of heart clamp holder；
Back-pressure valve, the back-pressure valve are set to the outlet of the core holding unit；
Flowmeter, the flowmeter are connected by pipeline with the outlet of the back-pressure valve and the core holding unit；
Data acquisition module, the data acquisition module and the differential pressure pickup and the adjustment module communication connection, are used for
Acquire the test data of the test device.
2. the test device of steady state method shale gas permeability under reservoir conditions according to claim 1, wherein the survey
Trial assembly is set further include:
One end of first valve, first valve is connected by pipeline with the entrance of the core holding unit, the other end and pumping
Empty device is connected；
Second valve, second valve be set to the entrance and the core holding unit of the core holding unit outlet it
Between；
Third valve, the third valve are set between first intermediate receptacle and the entrance of the core holding unit；
4th valve, the 4th valve are set between second intermediate receptacle and the outlet of the core holding unit；
5th valve, the 5th valve are set between the outlet of the core holding unit and the back-pressure valve；
6th valve, the outlet of the core holding unit successively with the 4th valve, the 6th valve, the back-pressure valve and
The flowmeter is connected.
3. the test device of steady state method shale gas permeability under reservoir conditions according to claim 2, wherein the survey
Trial assembly is set further include:
First pressure sensor, the first pressure sensor are connected with second valve；
Second pressure sensor, the second pressure sensor are set to the confining pressure and automatically track pump and the core holding unit
Between；
The first pressure sensor and the second pressure sensor respectively with the data acquisition module communication connection.
4. the test device of steady state method shale gas permeability under reservoir conditions according to claim 1, wherein the survey
Trial assembly is set further include:
Booster pump, the booster pump are set between the injection module and the entrance of the core holding unit.
5. the test device of steady state method shale gas permeability under reservoir conditions according to claim 1, wherein the note
Enter module for injection gas cylinder.
6. the test device of steady state method shale gas permeability under reservoir conditions according to claim 1, wherein the tune
Section module is twin cylinder pump.
7. the test method of steady state method shale gas permeability, utilizes any one of claim 1-6 under a kind of reservoir conditions
The test device of steady state method shale gas permeability under the reservoir conditions, comprising:
Rock core to be measured is placed in the core holding unit, pump setting tracking pressure difference is automatically tracked by confining pressure, and set perseverance
Temperature of Warm Case；
The core holding unit is vacuumized；
Gas is injected to setting pressure to the core holding unit by injection module；
When the rock core to be measured is low-permeability, the injection pressure and back pressure pressure of adjustment module are set, obtains the test dress
The pressure difference set, pressure, pump discharge and pump volume is moved back, records the pump discharge and the pressure difference and gas moved back when pump volume is stablized
Flow；
When the rock core to be measured is high permeability, the injection pressure and back pressure pressure of the adjustment module are set, the survey is obtained
Pressure difference, pressure and the gas flow that trial assembly is set record pressure difference, pressure and the gas flow when gas flow is stablized.
8. the test method of steady state method shale gas permeability under reservoir conditions according to claim 7, wherein the survey
Method for testing further include:
When setting pressure is not achieved to core holding unit injection gas in injection module, by booster pump to the test device
Pressurization.
9. the test method of steady state method shale gas permeability under reservoir conditions according to claim 7, wherein it is described with
Track pressure difference is 2.5-3.5MPa.
10. the test method of steady state method shale gas permeability under reservoir conditions according to claim 7, wherein to institute
It states core holding unit and vacuumizes and include:
The 5th valve and the 6th valve are closed, first valve, second valve, the third valve are opened
And the 4th valve, the test device is vacuumized by first valve.
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