CN107167413A - A kind of compact rock core apparent permeability test device and method of testing - Google Patents
A kind of compact rock core apparent permeability test device and method of testing Download PDFInfo
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- CN107167413A CN107167413A CN201710492533.XA CN201710492533A CN107167413A CN 107167413 A CN107167413 A CN 107167413A CN 201710492533 A CN201710492533 A CN 201710492533A CN 107167413 A CN107167413 A CN 107167413A
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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
Abstract
The application provides a kind of compact rock core apparent permeability test device and method of testing, and device includes：Core holding unit, the first high head injection pump, the second high head injection pump, pressure difference meter, the first pressure-resistant piston container, micro-flowmeter, the first valve, the second valve, the 3rd valve, the 4th valve and the 5th valve, wherein, micro-flowmeter includes the first pressure vessel, the second pressure vessel, high pressure micro-flow pump, pressure-resistant capillary, electric resistance measuring apparatus and the 6th valve.After fluid is measured full of pressure-resistant capillary, close the 3rd valve and the 5th valve, open the 4th valve and the 6th valve, start high pressure micro-flow pump, measurement fluid is set to retract pressure-resistant capillary head end, the 4th valve, the 6th valve and high pressure micro-flow pump are closed when electric resistance measuring apparatus institute measuring resistance value is initial resistivity value, the 3rd valve and the 5th valve is opened.The application can realize that unstable micrometeor is continuously measured in real time under high pressure, and then can realize that compact rock core apparent permeability is continuously measured.
Description
Technical field
The application belongs to core experiment analysis field, is related to a kind of compact rock core apparent permeability test device and based on the dress
The method of testing put.
Background technology
Abnormal seepage flow of the fluid in compact rock core causes traditional penetration rate test philosophy and method to be not suitable for fine and close rock
Heart permeability is tested.Therefore, the principle and instrument demand for being suitable for the test of compact rock core permeability are very urgent, it has also become restriction
The bottleneck problem of the compact reservoirs such as tight sand/shale/coal petrography exploitation theory and technology research.
The method of current testing rock core permeability mainly has steady state method, transient pressure pulse attenuation method, pore pressure vibration
Method and unconventional steady state method etc..Its general principle is the Darcy formula of linear seepage flow, and permeability value therein is and pressure ladder
Spend (flow velocity) unrelated constant.But show that compact rock core permeability and barometric gradient (flow velocity) have close according to current research
Correlation.So existing traditional penetration rate test philosophy and method are only applicable to meet the middle and high infiltration rock of Darcy linear seepage flow
The heart, is not suitable for the test of compact rock core apparent permeability curve.
There is the region such as non-current, low-speed non-linear seepage and linear seepage flow in the seepage flow in compact rock core.According to a large amount of realities
Test result to show, seepage flow does not meet traditional classical theory under compact rock core mesohigh environment, and this is accomplished by that fine and close rock can be characterized
The model of seepage characteristic essence and rule, and need to measure under oil reservoir hyperbaric environment in the heart.Compact rock core apparent permeability is tested
The technical bottleneck problem faced is the real-time continuous measurement of micrometeor under the ultra-high voltage environment of stratum.But current existing flow
E measurement technology can not meet compact rock core permeability test request.
The content of the invention
The application provides a kind of compact rock core apparent permeability test device and method of testing, for solving prior art in height
Pressure, it is impossible to the problem of measuring the compact rock core permeability under small pressure difference.
In order to solve the above-mentioned technical problem, the technical scheme of the application one fills to provide a kind of compact rock core apparent permeability test
Put, including：
It is core holding unit, the first high head injection pump, the second high head injection pump, pressure difference meter, the first pressure-resistant piston container, micro-
Flowmeter, the first valve, the second valve, the 3rd valve, the 4th valve and the 5th valve, wherein, the first pressure-resistant piston container leads to
Cross piston and be divided into upper chamber and lower cavity, the first pressure-resistant piston upper vessel portion cavity is equipped with gas, and the second pressure-resistant piston holds
Device lower cavity is equipped with pump pressure transmission liquid；
Core holding unit is used to accommodate core sample；
First high head injection pump connects core holding unit second entrance, for adjusting confined pressure；
Second high head injection pump connects core holding unit first entrance, and the first pressure-resistant piston container is connected by the first valve
Upper chamber, connects the first pressure-resistant piston lower vessel portion cavity, for providing pressure and being noted to core sample by the second valve
Enter Experimental Flowing Object；
Pressure difference meter is connected between core holding unit first entrance and outlet, for measuring pressure difference；
First pressure-resistant piston upper vessel portion cavity also connects core holding unit by the 4th valve and exported；
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and core holding unit outlet, for measurement stream
Amount, including the first pressure vessel, the second pressure vessel, high pressure micro-flow pump, pressure-resistant capillary, electric resistance measuring apparatus and the 6th valve
Door；
Measurement stream body is equipped with first pressure vessel, first pressure vessel one end connects rock core by the 3rd valve and clamped
Device is exported, and the first pressure vessel other end connects pressure-resistant capillary head end；
Gas is equipped with second pressure vessel, second pressure vessel one end connects the first pressure-resistant piston upper vessel portion chamber
Body, the second pressure vessel other end connects pressure-resistant capillary head end by the 6th valve；
Pressure-resistant capillary tail end connects high pressure micro-flow pump, and the first pressure-resistant piston upper vessel portion chamber is connected by the 5th valve
Body；
Electric resistance measuring apparatus is connected to pressure-resistant capillary two ends by signal wire.
Based on above-mentioned compact rock core apparent permeability test device, the application also provides a kind of compact rock core apparent permeability test
Method, including：
Core sample is fitted into core holding unit, confined pressure is adjusted by the first high head injection pump；
The 4th valve and the 5th valve are opened, the second high head injection pump of control applies pressure, so that rock in core holding unit
Heart sample injection experimentses fluid, the second high head injection pump pressure is stopped after pressure difference meter measures pressure difference stabilization；
The first valve and the second valve are opened, the second high head injection pump of control applies pressure, so that pressure is to reality in device
Test pressure；
The first valve, the second valve and the 4th valve are closed, the 3rd valve is opened, the second high head injection pump of control is with ladder
Measurement stream in the mode injection experimentses fluid of boosting, the first pressure vessel is known from experience gradually flows into pressure-resistant capillary under pressure
Pipe, the resistance value that the pressure difference and electric resistance measuring apparatus that record pressure difference meter is measured after boosting is stable every time are measured, according to resistance value
Flow is calculated, according to pressure difference and flow rate calculation apparent permeability；
After fluid is measured full of pressure-resistant capillary, the 3rd valve and the 5th valve are closed, the 4th valve and the 6th is opened
Valve, starts high pressure micro-flow pump, measurement fluid is retracted pressure-resistant capillary head end, treat that electric resistance measuring apparatus institute measuring resistance value is
The 4th valve, the 6th valve and high pressure micro-flow pump are closed during initial resistivity value, the 3rd valve and the 5th valve is opened.
The compact rock core apparent permeability test device and method provided by the application, can be realized unstable micro- under high pressure
The continuous real-time measurement of flow and micro-pressure-difference, and then the continuous measurement of compact rock core apparent permeability can be realized, further,
Realize the curved measurement of compact rock core apparent permeability.
Brief description of the drawings
In order to illustrate more clearly of the technical scheme in the embodiment of the present application, make required in being described below to embodiment
Accompanying drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the present application, for
For those of ordinary skill in the art, without having to pay creative labor, it can also be obtained according to these accompanying drawings
His accompanying drawing.
Fig. 1 is the structure chart of the compact rock core apparent permeability test device of the embodiment of the application one；
Fig. 2 is the structure chart of the compact rock core apparent permeability test device of another embodiment of the application；
Fig. 3 is the flow chart of the compact rock core apparent permeability method of testing of the embodiment of the application one；
Fig. 4 is the data analysis process schematic diagram of the embodiment of the application one；
Fig. 5 is the graph of a relation of the embodiment compact rock core seepage pressure gradient of the application one and flow velocity；
Fig. 6 is the measured curve figure of the embodiment of the application one lower compact rock core apparent permeability different in flow rate.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present application, the technical scheme in the embodiment of the present application is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only some embodiments of the present application, rather than whole embodiments.It is based on
Embodiment in the application, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of the application protection.
As shown in figure 1, structure charts of the Fig. 1 for the compact rock core apparent permeability test device of the embodiment of the present application.This implementation
Example applies also for the measurement of other types rock core in addition to being applicable to compact rock core.Surveyed by the compact rock core apparent permeability
Trial assembly, which is put, can realize the continuous real-time measurement of unstable micrometeor under high pressure, and then can realize compact rock core apparent permeability
Continuous measurement.
Specifically, compact rock core apparent permeability test device includes：Core holding unit 1, the first high head injection pump 2, second
High head injection pump 3, pressure difference meter 4, the first pressure-resistant piston container 5, micro-flowmeter, the first valve 6, the second valve 7, the 3rd valve
8th, the 4th valve 9 and the 5th valve 10, wherein, the first pressure-resistant piston container 5 is divided into upper chamber and lower cavity by piston,
First pressure-resistant piston upper vessel portion cavity is equipped with gas, and the second pressure-resistant piston lower vessel portion cavity is equipped with pump pressure transmission liquid.
Core holding unit 1 is used to accommodate core sample, and core sample is sealed under oil reservoir hyperbaric environment to simulate, detailed
Say, core sample is close to the madial wall of core holding unit, core holding unit 1 there are two entrances (first entrance and second entrance)
And one outlet.
First high head injection pump 2 connects the second entrance of core holding unit 1, for applying confined pressure to core sample.
Second high head injection pump 3 connects the first entrance of core holding unit 1, for providing pressure to core sample injection experimentses
Fluid, and make core holding unit pressure at two ends (experimental pressure can be according to actual compactness rock core oil reservoir pressure to experimental pressure
Power is set).
Second high head injection pump 3 also connects the first pressure-resistant piston upper vessel portion cavity by the first valve 6, passes through the second valve
Door 7 connects the first pressure-resistant piston lower vessel portion cavity.
Pressure difference meter 4 is connected between the first entrance of core holding unit 1 and outlet, is clamped for measuring pressure difference, i.e. rock core
The pressure difference at device two ends.
First pressure-resistant piston upper vessel portion cavity also connects core holding unit 1 by the 4th valve 9 and exported.
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and core holding unit 1 outlet, for measuring
Flow, including the first pressure vessel 11, the second pressure vessel 12, high pressure micro-flow pump 13, pressure-resistant capillary 14, resistance measurement dress
Put 15 and the 6th valve 16.
Measurement stream body is equipped with first pressure vessel 11, first pressure vessel one end connects rock core by the 3rd valve 8
Clamper 1 is exported, and the first pressure vessel other end connects the pressure-resistant head end of capillary 14.
Gas is equipped with second pressure vessel 12, second pressure vessel one end connects the first pressure-resistant piston upper vessel portion chamber
Body, the second pressure vessel other end connects the pressure-resistant head end of capillary 14 by the 6th valve 16.
The pressure-resistant tail end of capillary 14 connection high pressure micro-flow pump 13, the first pressure-resistant piston container is connected by the 5th valve 10
Upper chamber.During implementation, the pressure-resistant tail end of capillary 14 can also pass through the 5th valve and the 4th valve and core holding unit tail end phase
Even.
Electric resistance measuring apparatus 15 is connected to the pressure-resistant two ends of capillary 14 by signal wire, is surveyed for measuring in pressure-resistant capillary
Measure the aggregate resistance value that fluid is constituted with preset non conducting fluid, the aggregate resistance value can anti-Experimental Flowing Object flow through fine and close rock
The flow of heart sample.
In some embodiments, compact rock core apparent permeability test device also includes computer 17, connects the first high pressure injection
Enter pump 2, the second high head injection pump 3, pressure difference meter 4, the first valve 6, the second valve 7, high pressure micro-flow pump 13, resistance measurement dress
The 15, the 3rd valve 8, the 4th valve 9, the 5th valve 10 and the 6th valve 16 are put, for control valve, the unlatching and closing of pump,
The resistance value that the pressure difference and electric resistance measuring apparatus that monitoring pressure difference meter is measured are measured.
Specifically, gas is used to stablize experimental pressure in the first pressure-resistant piston upper vessel portion cavity.Its principle is to pass through
The compressibility of gas keeps the steady of experimental pressure, prevents pipeline switching from causing pressure oscillation excessive.Upper chamber may be used also
As chamber is reclaimed, for recovery experiment liquid and measurement fluid.
The first pressure-resistant piston container 5 is had access to by opening the 4th valve 9, the first pressure-resistant piston container 5 is used as return
Tank, for recovery experiment fluid.It can make the pressure-resistant tail end pressure of capillary 14 and core holding unit 1 by opening the 5th valve 10
It is identical.
It can realize and core holding unit two ends are pressurizeed simultaneously by opening the first valve 6 and the second valve 7, make in device
Pressure is adjusted to experimental pressure.It can terminate to add core holding unit two ends jointly by closing the first valve 6 and the second valve 7
Pressure, is individually pressurizeed to be realized using the second high head injection pump to core holding unit head end.
Micro-flowmeter is had access to by closing the 4th valve 9, opening the 3rd valve 8.
Micro-flowmeter can be closed by closing the 3rd valve 8 and the 5th valve 10.By opening the 4th valve 9 and the 6th
Valve 16 ensure that experiment continues, while can make the measurement fluid in pressure-resistant capillary using high pressure micro-flow pump 13 is opened
Pressure-resistant capillary head end is retracted, the measurement fluid exited from pressure-resistant capillary may enter in the second pressure vessel or stay in pipe
Lu Zhong.When electric resistance measuring apparatus institute measuring resistance value is initial resistivity value, the 4th valve 9, the 6th valve 16 and high pressure are closed micro-
Flow pump 13 can terminate to adjust the liquid in pressure-resistant capillary.It is initial resistivity value to treat electric resistance measuring apparatus institute measuring resistance value
When, micro-flowmeter can be accessed again by opening the 3rd valve 8 and the 5th valve 10.
In some embodiments, Experimental Flowing Object includes but is not limited to oil, water, polymeric liquid, measurement fluid be different from
The conducting liquid of Experimental Flowing Object.Pressure-resistant capillary is the pressure-resistant capillary that insulate, and the diameter of pipe can be selected according to measurement range.
One section of non-conductive preset fluid immiscible with measurement fluid is provided with pressure-resistant capillary.
In some embodiments, the first pressure vessel and the second pressure vessel are vertically arranged.To utilize gravitational differentiation, make
Fluid is measured under, gas is upper, so as to completely cut off gas and measurement fluid.
As shown in Fig. 2 in another embodiment of the application, compact rock core apparent permeability test device also includes the second pressure-resistant work
Container 18 is filled in, it is vertical to place, it is housing structure, upper chamber and lower cavity, the second pressure-resistant piston container is divided into by piston
Upper chamber is built with Experimental Flowing Object, and the second pressure-resistant piston lower vessel portion cavity transmits liquid built with pump pressure.Second pressure-resistant work
The upper chamber of the container 18 connection first entrance of core holding unit 1 is filled in, the second pressure-resistant lower cavity of piston container 18 connection second is high
Injection pump 3 is pressed, the pump pressure transmission liquid of the second high head injection pump 3 injection is received, holds the second pressure-resistant piston by pressure transmission
Experimental Flowing Object in device upper chamber flows into core sample.
First valve 6 be connected to the second pressure-resistant piston upper vessel portion cavity and the first pressure-resistant piston upper vessel portion cavity it
Between, the second valve 7 is connected between the second pressure-resistant piston lower vessel portion cavity and the first pressure-resistant piston lower vessel portion cavity.
Again referring to Fig. 2, compact rock core apparent permeability test device also includes being equipped with rock in insulating box 19, insulating box 19
Heart clamp holder 1, the first pressure vessel 11, the second pressure vessel 12, pressure-resistant capillary 14, for simulated formation temperature.During implementation,
3rd valve 8 and the 6th valve 16 are also disposed in insulating box.
As shown in figure 3, flow charts of the Fig. 3 for the compact rock core apparent permeability method of testing of the embodiment of the present application.The densification
Rock core apparent permeability method of testing is applied to the compact rock core apparent permeability test device described in foregoing any embodiment.In method
Before implementation, each valve is closed, and being turned on and off of each valve can be realized by people's control or by controller.
The compact rock core apparent permeability method of testing of the present embodiment considers low-speed non-linear seepage area flow velocity to fine and close rock
The influence of heart permeability, can realize the continuous real-time measurement of unstable micrometeor under high pressure, and then can realize compact rock core
The continuous measurement of apparent permeability.Specifically, including：
Step 301：Core sample is fitted into core holding unit, confined pressure is adjusted by the first high head injection pump.First is high
Injection pump moment regulation confined pressure is pressed, confined pressure is always held at setting confined pressure.
Step 302：The 4th valve and the 5th valve are opened, the second high head injection pump of control applies pressure, so that rock core is pressed from both sides
Core sample injection experimentses fluid in holder, the second high head injection pump pressure is stopped after pressure difference meter measures pressure difference stabilization.
In this step, the first pressure-resistant piston container is had access to by opening the 4th valve, the first pressure-resistant piston container is made
To return to tank, for recovery experiment fluid.By opening the 5th valve pressure-resistant capillary tail end pressure can be made to be clamped with rock core
Device is identical.
Step 303：The first valve and the second valve are opened, the second high head injection pump of control applies pressure, so that in device
Pressure is to experimental pressure.
In this step, it can realize that core holding unit head and the tail two ends add jointly by opening the first valve and the second valve
Pressure, makes pressure in device adjust to experimental pressure.
Step 304：The first valve, the second valve and the 4th valve are closed, the 3rd valve, control the second high pressure injection is opened
Measurement stream in pump injection experimentses fluid in the way of ladder boosts, the first pressure vessel is known from experience to be gradually flowed under pressure
Pressure-resistant capillary, the resistance value that the pressure difference and electric resistance measuring apparatus that record pressure difference meter is measured after boosting is stable every time are measured, root
Flow is calculated according to resistance value, according to pressure difference and flow rate calculation apparent permeability.
In this step, so-called ladder boosting is kept after certain time at a pressure, and pressure rapidly increases to another
After pressure, continue to rise after the pressure is kept for certain time, keep, rise, keep, continue this process.One pressure is kept
Time surveyed by electric resistance measuring apparatus depending on aggregate resistance value, after surveyed aggregate resistance value smooth transition, rise to next pressure
Power.
It can terminate core holding unit two ends by closing the first valve and the second valve and pressurize jointly, individually to give rock
Heart clamp holder head end pressurizes.Micro-flowmeter, the second high head injection pump are had access to by closing the 4th valve, opening the 3rd valve
The pressure of injection promotes the Experimental Flowing Object in core holding unit to flow, and then the measurement fluid in the first pressure vessel of promotion is gradually
Flow into pressure-resistant capillary.In this step, the first pressure-resistant piston container is as tank is returned, for reclaiming measurement fluid.
Step 305：After fluid is measured full of pressure-resistant capillary, the 3rd valve and the 5th valve are closed, the 4th valve is opened
Door and the 6th valve, start high pressure micro-flow pump, measurement fluid is retracted pressure-resistant capillary head end, non-electrically conductive liquid injection is pressure-resistant
In capillary, the 4th valve of closing, the 6th valve and high pressure are micro- when electric resistance measuring apparatus institute measuring resistance value is initial resistivity value
Flow pump, opens the 3rd valve and the 5th valve.
In this step, micro-flowmeter can be closed by closing the 3rd valve and the 5th valve.By opening the 4th valve
It ensure that experiment continues, by opening the 6th valve the second pressure vessel can be made to reclaim the survey retracted out of pressure-resistant capillary
The air measured in fluid, the second pressure vessel is compressed, because the second pressure vessel is connected with the second pressure-resistant piston container, because
This, will not produce big compression.When electric resistance measuring apparatus institute measuring resistance value is initial resistivity value, the 4th valve, the 6th are closed
Valve and high pressure micro-flow pump can terminate to adjust the liquid in pressure-resistant capillary.Treat that electric resistance measuring apparatus institute measuring resistance value is first
During beginning resistance value, micro-flowmeter can be accessed again by opening the 3rd valve and the 5th valve.
Further, also include adjusting the temperature of insulating box to design temperature before above-mentioned steps 302, to simulate cause
Close rock core formation temperature.During implementation, need to stand a period of time after setting temperature, until each instrument temperature stabilization exists in insulating box
After required measurement temperature, next step is carried out.
Further, the second high head injection pump is controlled to apply pressure in above-mentioned steps 302, so that rock core in core holding unit
Sample injection experimentses fluid further comprises：
The second high head injection pump is controlled to the second pressure-resistant piston lower vessel portion cavity injection pump pressure transmission liquid, through excess pressure
Transmission makes the Experimental Flowing Object in the second pressure-resistant piston upper vessel portion cavity flow into core sample.
Further, in above-mentioned steps 304, flow is calculated by equation below：
Qt=A'(ht-hi0)/(ti-ti0), ht=-aRt+b；
Wherein, QtFor the flow of t；A' is the cross-sectional area of pressure-resistant capillary；hi0For the initial liquid of pressure-resistant capillary
Position；htFor the liquid level of t；tiFor the measurement moment；ti0At the time of for ith initial liquid level correspondence；RtFor electric resistance measuring apparatus t
The resistance value that moment measures；A and b is constant.
Apparent permeability is calculated by equation below：
Wherein, k is apparent permeability；QtFor the flow of t；μ is tested media viscosity；L is rock core length；A is rock core
Overflow section is accumulated；ΔptThe pressure difference measured for pressure difference meter t.
In some embodiments, compact rock core apparent permeability method of testing also includes testing above-mentioned compact rock core apparent permeability
The analysis process of method data measured, as shown in figure 4, including：
Step 401：According to flow rate calculation flow velocity, barometric gradient is calculated according to pressure difference.
Specifically, calculating flow velocity by equation below：
Wherein, vtFor the flow velocity of t；A accumulates for rock core overflow section；QtFor the flow of t.
Barometric gradient is calculated by equation below：
Wherein, GtFor the barometric gradient of t；ΔptThe pressure difference measured for pressure difference meter t；L is rock length.
Step 402：According to flow velocity and the relation of barometric gradient fitting flow velocity and barometric gradient, the pass of flow velocity and barometric gradient
System can be represented with the curve of flow velocity and barometric gradient, as shown in figure 5, empty circles be experimental data (i.e. according to the pressure difference of record
And resistance value calculates obtained data), flow velocity is proportional with barometric gradient.
During implementation, specific approximating method can not limited by least square fitting curve, the application.
Step 403：Corresponding barometric gradient is to start pressure when determining that flow velocity is 0 with the relation of barometric gradient according to flow velocity
Gradient, as shown in figure 5, the corresponding abscissa value of vertical dotted line is free-boundary problem.
Further, again referring to Fig. 4, also including in addition to calculating free-boundary problem：
Step 404：According to the relation of flow velocity and apparent permeability fitting flow velocity and apparent permeability, the pass of flow velocity and apparent permeability
System can be represented with flow velocity with apparent permeability curve, as shown in fig. 6, black circles are experimental data.
During implementation, specific approximating method can not limited by least square fitting curve, the application.
Step 405：Corresponding apparent permeability oozes for startup when determining that flow velocity tends to 0 according to flow velocity and the relation of apparent permeability
Saturating rate (the k in such as Fig. 60), it is limit permeability (in Fig. 6 that flow velocity, which tends to corresponding apparent permeability when infinite (sufficiently large),
k∞)。
Step 406：The attenuation coefficient of apparent permeability is determined according to the relation of flow velocity and apparent permeability.The decay of apparent permeability
Coefficient characterizes the speed that apparent permeability is decayed with the reduction of flow velocity (or barometric gradient).
Step 407：According to rock core penetration theory, the calculation formula for obtaining compact rock core apparent permeability is：
Wherein, k is apparent permeability；k∞For limit permeability；k0To start permeability；C is the attenuation coefficient of apparent permeability；
G is barometric gradient；G0For free-boundary problem.
The compact rock core apparent permeability method of testing that the application is provided can be realized and caused under normal temperature and pressure-high temperature and high pressure environment
The quantification of the seepage characteristic of compact rock core under the influence of the accurate measurement of close rock core gas (or liquid) apparent permeability and various factors
Research.Its pressure limit is 0.1MPa~80MPa, temperature range at 0~200 DEG C, flow measurement range be 10nL/min~
5mL/min。
The embodiment of the present application also provides a kind of storage medium, such as ROM/RAM, magnetic disc, CD etc., is wrapped in the storage medium
The program of storage is included, the compact rock core that equipment where control storage medium is performed described in any of the above-described embodiment when program is run is regarded
The step of permeability method of testing.
The embodiment of the present application also provides a kind of processor, and the processor is used for operation program, and program performs above-mentioned when running
Described in any embodiment the step of compact rock core apparent permeability method of testing.
It should be understood by those skilled in the art that, the application embodiment of the method can be provided as computer program product.This Shen
It please can use the computer-usable storage medium for wherein including computer usable program code one or more (including but not
Be limited to magnetic disk storage, CD-ROM, optical memory etc.) on the form of computer program product implemented.It should be understood that can be by counting
Each flow and/or square frame and flow chart and/or block diagram in calculation machine programmed instruction implementation process figure and/or block diagram
In flow and/or square frame combination.These computer program instructions can be provided to all-purpose computer, special-purpose computer, insertion
Formula processor or the processor of other programmable data processing devices are to produce a machine so that by computer or other can
The instruction of the computing device of programming data processing equipment produce for realizing in one flow of flow chart or multiple flows and/or
The device for the function of being specified in one square frame of block diagram or multiple square frames.
These computer program instructions, which may be alternatively stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that the instruction being stored in the computer-readable memory, which is produced, to be included referring to
Make the manufacture of device, the command device realize in one flow of flow chart or multiple flows and/or one square frame of block diagram or
The function of being specified in multiple square frames.
These computer program instructions can be also loaded into computer or other programmable data processing devices so that in meter
Series of operation steps is performed on calculation machine or other programmable devices to produce computer implemented processing, thus in computer or
The instruction performed on other programmable devices is provided for realizing in one flow of flow chart or multiple flows and/or block diagram one
The step of function of being specified in individual square frame or multiple square frames.
Particular embodiments described above, purpose, technical scheme and beneficial effect to the application have been carried out further in detail
Describe in detail bright, should be understood that the specific embodiment that the foregoing is only the application, be not used to limit the guarantor of the application
Scope, all any modification, equivalent substitution and improvements within spirit herein and principle, done etc. are protected, this is should be included in
Within the protection domain of application.
Claims (14)
1. a kind of compact rock core apparent permeability test device, it is characterised in that including：Core holding unit, the first high head injection pump,
Second high head injection pump, pressure difference meter, the first pressure-resistant piston container, micro-flowmeter, the first valve, the second valve, the 3rd valve,
4th valve and the 5th valve, wherein, the first pressure-resistant piston container is divided into upper chamber and lower cavity by piston, and first is resistance to
Press piston upper vessel portion cavity that gas is housed, the second pressure-resistant piston lower vessel portion cavity is equipped with pump pressure transmission liquid；
Core holding unit is used to accommodate core sample；
First high head injection pump connects core holding unit second entrance, for adjusting confined pressure；
Second high head injection pump connects core holding unit first entrance, and the first pressure-resistant piston upper vessel portion is connected by the first valve
Cavity, the first pressure-resistant piston lower vessel portion cavity is connected by the second valve, for providing pressure and injecting real to core sample
Test fluid；
Pressure difference meter is connected between core holding unit first entrance and outlet, for measuring pressure difference；
First pressure-resistant piston upper vessel portion cavity also connects core holding unit by the 4th valve and exported；
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and core holding unit outlet, for measuring flow,
Including the first pressure vessel, the second pressure vessel, high pressure micro-flow pump, pressure-resistant capillary, electric resistance measuring apparatus and the 6th valve；
Measurement stream body is equipped with first pressure vessel, first pressure vessel one end connects core holding unit by the 3rd valve and gone out
Mouthful, the first pressure vessel other end connects pressure-resistant capillary head end；
Gas is equipped with second pressure vessel, second pressure vessel one end connects the first pressure-resistant piston upper vessel portion cavity, the
The two pressure vessel other ends connect pressure-resistant capillary head end by the 6th valve；
Pressure-resistant capillary tail end connects high pressure micro-flow pump, and the first pressure-resistant piston upper vessel portion cavity is connected by the 5th valve；
Electric resistance measuring apparatus is connected to pressure-resistant capillary two ends by signal wire.
2. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that also including the second pressure-resistant piston
Container, is divided into upper chamber and lower cavity, the second pressure-resistant piston upper vessel portion cavity is built with Experimental Flowing Object, by piston
Two pressure-resistant piston lower vessel portion cavitys transmit liquid built with pump pressure；
Second pressure-resistant piston upper vessel portion cavity connection core holding unit first entrance, the second pressure-resistant piston lower vessel portion cavity connects
Connect the second high head injection pump, receive the pump pressure transmission liquid of the second high head injection pump injection, make by pressure transmission second pressure-resistant
Experimental Flowing Object in piston upper vessel portion cavity flows into core sample；
First valve is connected between the second pressure-resistant piston upper vessel portion cavity and the first pressure-resistant piston upper vessel portion cavity；
Second valve is connected between the second pressure-resistant piston lower vessel portion cavity and the first pressure-resistant piston lower vessel portion cavity.
3. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that also including computer, connection
First high head injection pump, the second high head injection pump, pressure difference meter, the first valve, the second valve, high pressure micro-flow pump, resistance are surveyed
Measure device, the 3rd valve, the 4th valve, the 5th valve and the 6th valve.
4. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that also including insulating box, constant temperature
Core holding unit, the first pressure vessel, the second pressure vessel, pressure-resistant capillary are equipped with case, for providing temperature.
5. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that set in the pressure-resistant capillary
It is equipped with one section of non conducting fluid immiscible with measurement fluid.
6. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that first pressure vessel and
Second pressure vessel is vertically arranged.
7. compact rock core apparent permeability test device as claimed in claim 1, it is characterised in that Experimental Flowing Object include oil, water,
Polymer, measurement fluid is conducting liquid.
8. a kind of compact rock core apparent permeability method of testing, it is characterised in that suitable for described in any one of claim 1 to 7
Compact rock core apparent permeability test device, including：
Core sample is fitted into core holding unit, confined pressure is adjusted by the first high head injection pump；
The 4th valve and the 5th valve are opened, the second high head injection pump of control applies pressure, so that core sample in core holding unit
Product injection experimentses fluid, the second high head injection pump pressure is stopped after pressure difference meter measures pressure difference stabilization；
The first valve and the second valve are opened, the second high head injection pump of control applies pressure, so that pressure is to testing pressure in device
Power；
The first valve, the second valve and the 4th valve are closed, the 3rd valve is opened, the second high head injection pump of control is boosted with ladder
Mode injection experimentses fluid, the measurement fluid in the first pressure vessel gradually flows into pressure-resistant capillary under pressure, often
The resistance value that the pressure difference and electric resistance measuring apparatus that record pressure difference meter is measured after secondary boosting is stable are measured, calculates according to resistance value and flows
Amount, according to pressure difference and flow rate calculation apparent permeability；
After fluid is measured full of pressure-resistant capillary, the 3rd valve and the 5th valve are closed, the 4th valve and the 6th valve is opened,
Start high pressure micro-flow pump, measurement fluid is retracted pressure-resistant capillary head end, treat that electric resistance measuring apparatus institute measuring resistance value is initial
The 4th valve, the 6th valve and high pressure micro-flow pump are closed during resistance value, the 3rd valve and the 5th valve is opened.
9. compact rock core apparent permeability method of testing as claimed in claim 8, it is characterised in that the second high head injection pump of control
Apply pressure, so that core sample injection experimentses fluid further comprises in core holding unit：
The second high head injection pump is controlled to the second pressure-resistant piston lower vessel portion cavity injection pump pressure transmission liquid, by pressure transmission
The Experimental Flowing Object in the second pressure-resistant piston upper vessel portion cavity is set to flow into core sample.
10. compact rock core apparent permeability method of testing as claimed in claim 8, it is characterised in that calculated by equation below
Flow：
Qt=A'(ht-hi0)/(ti-ti0), ht=-aRt+b；
Wherein, QtFor the flow of t；A' is the cross-sectional area of pressure-resistant capillary；hi0For the initial liquid level of pressure-resistant capillary；ht
For the liquid level of t；tiFor the measurement moment；ti0At the time of for ith initial liquid level correspondence；RtFor electric resistance measuring apparatus t
The resistance value measured；A and b is constant.
11. compact rock core apparent permeability method of testing as claimed in claim 8, it is characterised in that calculated by equation below
Apparent permeability：
<mrow>
<mi>k</mi>
<mo>=</mo>
<mfrac>
<msub>
<mi>Q</mi>
<mi>t</mi>
</msub>
<mrow>
<msub>
<mi>A&Delta;p</mi>
<mi>t</mi>
</msub>
</mrow>
</mfrac>
<mi>&mu;</mi>
<mi>L</mi>
<mo>;</mo>
</mrow>
Wherein, k is apparent permeability；QtFor the flow of t；μ is tested media viscosity；L is rock core length；A is that rock core excessively stream is cut
Area；ΔptThe pressure difference measured for pressure difference meter t.
12. compact rock core apparent permeability method of testing as claimed in claim 8, it is characterised in that also include：
According to flow rate calculation flow velocity, barometric gradient is calculated according to pressure difference；
According to flow velocity and the relation of barometric gradient fitting flow velocity and barometric gradient；
Corresponding barometric gradient is free-boundary problem when determining that flow velocity is 0 with the relation of barometric gradient according to flow velocity.
13. compact rock core apparent permeability method of testing as claimed in claim 12, it is characterised in that also include：
According to the relation of flow velocity and apparent permeability fitting flow velocity and apparent permeability；
Corresponding apparent permeability is to start permeability when determining that flow velocity tends to 0 according to flow velocity and the relation of apparent permeability, and flow velocity becomes
To it is infinite when corresponding apparent permeability be limit permeability；
The attenuation coefficient of apparent permeability is determined according to the relation of flow velocity and apparent permeability.
14. compact rock core apparent permeability method of testing as claimed in claim 13, it is characterised in that permeated and managed according to rock core
By the calculation formula for obtaining compact rock core apparent permeability is：
<mrow>
<mfenced open = "{" close = "">
<mtable>
<mtr>
<mtd>
<mrow>
<mi>k</mi>
<mo>=</mo>
<mn>0</mn>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>G</mi>
<mo>&le;</mo>
<msub>
<mi>G</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
<mtr>
<mtd>
<mrow>
<mi>k</mi>
<mo>=</mo>
<msup>
<mrow>
<mo>&lsqb;</mo>
<msup>
<msub>
<mi>k</mi>
<mi>&infin;</mi>
</msub>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>+</mo>
<mrow>
<mo>(</mo>
<msup>
<msub>
<mi>k</mi>
<mn>0</mn>
</msub>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>-</mo>
<msup>
<msub>
<mi>k</mi>
<mi>&infin;</mi>
</msub>
<mrow>
<mn>1</mn>
<mo>/</mo>
<mn>2</mn>
</mrow>
</msup>
<mo>)</mo>
</mrow>
<mi>exp</mi>
<mrow>
<mo>(</mo>
<mi>c</mi>
<mi>G</mi>
<mo>)</mo>
</mrow>
<mo>&rsqb;</mo>
</mrow>
<mn>2</mn>
</msup>
<mo>,</mo>
</mrow>
</mtd>
<mtd>
<mrow>
<mi>G</mi>
<mo>></mo>
<msub>
<mi>G</mi>
<mn>0</mn>
</msub>
</mrow>
</mtd>
</mtr>
</mtable>
</mfenced>
<mo>,</mo>
</mrow>
Wherein, k is apparent permeability；k∞For limit permeability；k0To start permeability；C is the attenuation coefficient of apparent permeability；G is pressure
Power gradient；G0For free-boundary problem.
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| CN201710492533.XA CN107167413B9 (en) | 2017-06-26 | 2017-06-26 | A kind of compact rock core apparent permeability test device and test method |
| US16/016,518 US10801943B2 (en) | 2017-06-26 | 2018-06-22 | Apparatus and method for measuring apparent permeability of tight rock core |
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| CN108896741A (en) * | 2018-08-01 | 2018-11-27 | 中国华能集团有限公司 | A kind of analysis fluid rate and property are to the system and its application method of shale reservoir nocuity |
| CN110146424A (en) * | 2019-05-08 | 2019-08-20 | 中国石油大学(北京) | The simulator and method of stratum cell breath |
| CN110455688A (en) * | 2019-05-28 | 2019-11-15 | 西南石油大学 | A kind of shale nuclear magnetic resonance air water mutually seeps test device and method |
| CN110763732A (en) * | 2019-11-05 | 2020-02-07 | 中国石油大学(华东) | Method for measuring resistivity of shale sample under different temperature, pressure and fluid conditions |
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| CN110763732A (en) * | 2019-11-05 | 2020-02-07 | 中国石油大学(华东) | Method for measuring resistivity of shale sample under different temperature, pressure and fluid conditions |
| CN117607005A (en) * | 2024-01-23 | 2024-02-27 | 中国石油大学(华东) | Method for measuring rock starting pressure gradient |
| CN117607005B (en) * | 2024-01-23 | 2024-04-12 | 中国石油大学(华东) | Method for measuring rock starting pressure gradient |
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| Publication number | Publication date |
|---|---|
| CN107167413B (en) | 2018-04-10 |
| CN107167413B9 (en) | 2018-11-13 |
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