CN107167413B9 - A kind of compact rock core apparent permeability test device and test method - Google Patents
A kind of compact rock core apparent permeability test device and test method Download PDFInfo
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- 230000035699 permeability Effects 0.000 title claims abstract description 97
- 239000011435 rock Substances 0.000 title claims abstract description 88
- 238000012360 testing method Methods 0.000 title claims abstract description 35
- 238000010998 test method Methods 0.000 title claims abstract description 22
- 238000002347 injection Methods 0.000 claims abstract description 61
- 239000007924 injection Substances 0.000 claims abstract description 61
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 238000005259 measurement Methods 0.000 claims abstract description 28
- 239000007788 liquid Substances 0.000 claims description 23
- 238000002474 experimental method Methods 0.000 claims description 16
- 238000004364 calculation method Methods 0.000 claims description 8
- 230000035515 penetration Effects 0.000 claims description 4
- 210000005239 tubule Anatomy 0.000 claims description 3
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- 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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Abstract
A kind of compact rock core apparent permeability test device of the application offer and test method, device include：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, third 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 measuring fluid full of pressure-resistant capillary, close third 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, open third valve and the 5th valve.The application can realize that unstable micrometeor continuously measures in real time under high pressure, and then can realize that compact rock core apparent permeability continuously measures.
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 is based on the dress
The test method set.
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 causing
Close core permeability test.Therefore, principle and the instrument demand for being suitable for the test of compact rock core permeability are very urgent
It cuts, it has also become the bottleneck for restricting the exploitation theory and technology research of the compact reservoirs such as tight sand/shale/coal petrography is asked
Topic.
The method of testing rock core permeability mainly has steady state method, transient pressure pulse attenuation method, pore pressure at present
Succusion and unconventional steady state method etc..Its basic principle is the Darcy formula of linear seepage flow, permeability therein
Value is the constant unrelated with barometric gradient (flow velocity).But according to it is current research shows that compact rock core permeability with
Barometric gradient (flow velocity) has close correlation.So existing traditional penetration rate test philosophy and method are only fitted
Middle and high infiltration rock core for meeting Darcy linear seepage flow is not suitable for the test of compact rock core apparent permeability curve.
There are the regions such as non-current, low-speed non-linear seepage and linear seepage flow for seepage flow in compact rock core.According to big
Amount the experimental results showed that, under compact rock core mesohigh environment seepage flow do not meet traditional classical theory, this just needs energy
The model of seepage characteristic essence and rule in compact rock core is enough characterized, and needs to measure under oil reservoir hyperbaric environment.
Compact rock core apparent permeability tests the reality that faced technical bottleneck problem is micrometeor under the ultra-high voltage environment of stratum
Shi Lianxu is measured.But current existing flow measurement technology cannot meet the test of compact rock core permeability and want
It asks.
Invention content
A kind of compact rock core apparent permeability test device of the application offer and test method, for solving the prior art in height
The problem of pressure, the compact rock core permeability being unable to measure under small pressure difference.
In order to solve the above-mentioned technical problem, one technical solution of the application is to provide a kind of compact rock core apparent permeability test dress
It sets, including：
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, third valve, the 4th valve and the 5th valve, wherein
First pressure-resistant piston container is divided into upper chamber and lower cavity, the first pressure-resistant piston upper vessel portion chamber by piston
Body is equipped with gas, and the first pressure-resistant piston lower vessel portion cavity transmits liquid equipped with pump pressure；
Core holding unit is for accommodating core sample；
First high head injection pump connects core holding unit second entrance, for adjusting confining pressure；
Second high head injection pump connects core holding unit first entrance, passes through the first pressure-resistant piston of the first valve connection
Upper vessel portion cavity, by the first pressure-resistant piston lower vessel portion cavity of the second valve connection, for providing pressure simultaneously
To core sample injection experiments 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 outlet by the 4th valve；
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and core holding unit outlet, for surveying
Measure flow, including the first pressure vessel, the second pressure vessel, high pressure micro-flow pump, pressure-resistant capillary, resistance
Measuring device and the 6th valve；
Measurement fluid is equipped in first pressure vessel, first pressure vessel one end connects rock core by third valve
Clamper exports, first pressure vessel other end connection pressure resistance capillary head end；
Gas, the first pressure-resistant piston upper vessel portion of second pressure vessel one end connection are equipped in second pressure vessel
Cavity, the second pressure vessel other end connect pressure-resistant capillary head end by the 6th valve；
Pressure-resistant capillary tail end connection high pressure micro-flow pump, by the first pressure-resistant piston container of the 5th valve connection
Portion's cavity；
Electric resistance measuring apparatus is connected to pressure-resistant capillary both 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, confining 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 experiments fluid measures after pressure difference meter and stops the second high head injection pump pressure after pressure difference is stablized；
Open the first valve and the second valve, 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, opens third valve, the second high head injection pump of control is with rank
The mode injection experiments fluid of ladder boosting, the measurement fluid in the first pressure vessel can gradually flow into resistance under pressure
Dabbing tubule, the resistance value that the pressure difference and electric resistance measuring apparatus that record pressure difference meter measures after boosting is stablized every time measure,
Flow is calculated according to resistance value, according to pressure difference and flow rate calculation apparent permeability；
After measuring fluid full of pressure-resistant capillary, third valve and the 5th valve are closed, opens the 4th valve and the 6th
Valve starts high pressure micro-flow pump, so that measurement fluid is retracted pressure-resistant capillary head end, wait for the surveyed electricity of electric resistance measuring apparatus
The 4th valve, the 6th valve and high pressure micro-flow pump are closed when resistance value is initial resistivity value, open third valve and the 5th
Valve.
By compact rock core apparent permeability test device provided by the present application and method, can realize unstable micro- under high pressure
The continuous real-time measurement of flow and micro-pressure-difference, and then can realize the continuous measurement of compact rock core apparent permeability, more into one
Step, realize the curved measurement of compact rock core apparent permeability.
Description of the drawings
In order to more clearly explain the technical solutions in the embodiments of the present application, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present application,
It for those of ordinary skill in the art, without having to pay creative labor, can also be attached according to these
Figure obtains other attached drawings.
Fig. 1 is the structure chart of the compact rock core apparent permeability test device of one embodiment of the application；
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 test method of one embodiment of the application；
Fig. 4 is the data analysis process schematic diagram of one embodiment of the application；
Fig. 5 is the relational graph of the application one embodiment compact rock core seepage pressure gradient and flow velocity；
Fig. 6 is the measured curve figure of one embodiment of the application lower compact rock core apparent permeability different in flow rate.
Specific implementation mode
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.
Based on the embodiment in the application, those of ordinary skill in the art are obtained without creative efforts
Every other embodiment, shall fall in the protection scope of this application.
As shown in FIG. 1, FIG. 1 is the structure charts of the compact rock core apparent permeability test device of the embodiment of the present application.This reality
Example is applied other than being applicable to compact rock core, applies also for the measurement of other types rock core.By the compact rock core depending on oozing
Saturating rate test device 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, 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, first are pressure-resistant piston container 5, micro-flowmeter, the first valve 6,
Second valve 7, third valve 8, the 4th valve 9 and the 5th valve 10, wherein the first pressure-resistant piston container
5 are divided into upper chamber and lower cavity by piston, and the first pressure-resistant piston upper vessel portion cavity is equipped with gas, the
One pressure-resistant piston lower vessel portion cavity transmits liquid equipped with pump pressure.
Core holding unit 1 is used to accommodate core sample, and core sample is sealed under oil reservoir hyperbaric environment to simulate,
Specifically, core sample is close to the madial wall of core holding unit, and there are two entrances (for core holding unit 1
One entrance and second entrance) and one outlet.
First high head injection pump 2 connects 1 second entrance of core holding unit, for applying confining pressure to core sample.
Second high head injection pump 3 connects 1 first entrance of core holding unit, is noted to core sample for providing pressure
Enter Experimental Flowing Object, and makes core holding unit pressure at two ends (experimental pressure can be according to actual cause to experimental pressure
Close property rock core reservoir pressure setting).
Second high head injection pump 3 also by the first pressure-resistant piston upper vessel portion cavity of the first valve 6 connection, passes through
The first pressure-resistant piston lower vessel portion cavity of second valve 7 connection.
Pressure difference meter 4 is connected between 1 first entrance of core holding unit and outlet, for measuring pressure difference, i.e. rock
The pressure difference at heart clamp holder both ends.
First pressure-resistant piston upper vessel portion cavity also connects core holding unit 1 by the 4th valve 9 and exports.
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and the outlet of core holding unit 1, is used for
Measure flow, including the first pressure vessel 11, the second pressure vessel 12, high pressure micro-flow pump 13, resistance to dabbing
Tubule 14, electric resistance measuring apparatus 15 and the 6th valve 16.
Measurement fluid is equipped in first pressure vessel 11, first pressure vessel one end is connected by third valve 8
Connect the outlet of core holding unit 1, first pressure vessel other end connection, 14 head end of pressure-resistant capillary.
Gas, the first pressure-resistant piston container of second pressure vessel one end connection are equipped in second pressure vessel 12
Upper chamber, the second pressure vessel other end connect 14 head end of pressure-resistant capillary by the 6th valve 16.
14 tail end of pressure-resistant capillary connects high pressure micro-flow pump 13, living by the first pressure resistance of the 5th valve 10 connection
Fill in upper vessel portion cavity.When implementation, 14 tail end of pressure-resistant capillary can also by the 5th valve and the 4th valve with
Core holding unit tail end is connected.
Electric resistance measuring apparatus 15 is connected to 14 both ends of pressure-resistant capillary by signal wire, for measuring pressure-resistant capillary
The aggregate resistance value that fluid is formed with preset non conducting fluid is measured in pipe, which counter can test
Fluid flows through the flow of compact rock core sample.
In some embodiments, compact rock core apparent permeability test device further includes computer 17, connects the first high pressure
Injection 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, electric resistance measuring apparatus 15, third valve 8, the 4th valve 9, the 5th valve 10 and the 6th valve 16, are used for
Control valve, pump unlatch and close, resistance value that the pressure difference that measures of monitoring pressure difference meter and electric resistance measuring apparatus measure.
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 the pressure oscillation excessive.Upper chamber
Reclaiming chamber is also acted as, for recovery experiment liquid and measures fluid.
The first pressure-resistant piston container 5, the first pressure-resistant 5 conduct of piston container are had access to by opening the 4th valve 9
Tank is returned, recovery experiment fluid is used for.By open the 5th valve 10 can make 14 tail end pressure of pressure-resistant capillary with
Core holding unit 1 is identical.
It can realize to core holding unit both ends while pressurize by the first valve 6 of unlatching and the second valve 7, make
Pressure is adjusted to experimental pressure in device.It can be terminated to rock core by closing the first valve 6 and the second valve 7
Clamper both ends are pressurizeed jointly, individually to be added to core holding unit head end using the realization of the second high head injection pump
Pressure.
Micro-flowmeter is had access to by closing the 4th valve 9, opening third valve 8.
Micro-flowmeter can be closed by closing third valve 8 and the 5th valve 10.By open the 4th valve 9 and
6th valve 16 can ensure that experiment continues, while unlatching high pressure micro-flow pump 13 can be utilized to make in pressure-resistant capillary
Measurement fluid retract pressure-resistant capillary head end, the measurement fluid exited from pressure-resistant capillary may enter second pressure resistance
In container or stay in pipeline.When electric resistance measuring apparatus institute measuring resistance value is initial resistivity value, the 4th valve 9 of closing,
6th valve 16 and high pressure micro-flow pump 13 can terminate to adjust the liquid in pressure-resistant capillary.Wait for electric resistance measuring apparatus
When institute's measuring resistance value is initial resistivity value, micro-flowmeter can be accessed again by opening third valve 8 and the 5th valve 10.
In some embodiments, Experimental Flowing Object includes but not limited to oil, water, polymeric liquid, measures fluid and is
Different from the conducting liquid of Experimental Flowing Object.Pressure-resistant capillary is the pressure-resistant capillary of insulation, and the diameter of pipe can be according to measurement
Range is selected.One section of non-conductive preset fluid immiscible with fluid is measured is provided in pressure-resistant capillary.
In some embodiments, the first pressure vessel and the second pressure vessel are vertically arranged.To utilize gravitational differentiation,
Make measurement fluid under, gas is upper, to completely cut off gas and measure fluid.
As shown in Fig. 2, in another embodiment of the application, compact rock core apparent permeability test device further includes second
Pressure-resistant piston container 18, it is vertical to place, it is housing structure, upper chamber and lower cavity is divided by piston, the
Experimental Flowing Object is housed in two pressure-resistant piston upper vessel portion cavitys, is passed equipped with pump pressure in the second pressure-resistant piston lower vessel portion cavity
Pass liquid.Second pressure-resistant 18 upper chamber of piston container connects 1 first entrance of core holding unit, the second pressure-resistant piston
18 lower cavity of container connects the second high head injection pump 3, and the pump pressure for receiving the injection of the second high head injection pump 3 transmits liquid
Body makes the Experimental Flowing Object in the second pressure-resistant piston upper vessel portion cavity flow into core sample by pressure transmission.
First valve 6 be connected to the second pressure-resistant piston upper vessel portion cavity and the first pressure resistance piston upper vessel portion cavity it
Between, the second valve 7 be connected to the second pressure-resistant piston lower vessel portion cavity and the first pressure resistance piston lower vessel portion cavity it
Between.
Again referring to Fig. 2, compact rock core apparent permeability test device further includes insulating box 19, housed in insulating box 19
There are core holding unit 1, the first pressure vessel 11, the second pressure vessel 12, pressure-resistant capillary 14, is used for mould
Quasi- formation temperature.When implementation, third valve 8 and the 6th valve 16 are also disposed in insulating box.
As shown in figure 3, Fig. 3 is the flow chart of the compact rock core apparent permeability test method of the embodiment of the present application.
The compact rock core apparent permeability test method is suitable for the compact rock core apparent permeability described in aforementioned any embodiment and surveys
Trial assembly is set.Method implementation before, each valve is closed, each valve be turned on and off can by people control or
It is realized by controller.
The compact rock core apparent permeability test method of the present embodiment considers low-speed non-linear seepage area flow velocity to densification
The influence of core permeability, can realize the continuous real-time measurement of unstable micrometeor under high pressure, and then can realize
The continuous measurement of compact rock core apparent permeability.Specifically, including：
Step 301：Core sample is fitted into core holding unit, confining pressure is adjusted by the first high head injection pump.First
The high head injection pump moment adjusts confining pressure, and confining pressure is made to be always held at setting confining 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
Core sample injection experiments fluid in clamper measures after pressure difference is stablized after pressure difference meter and stops the second high head injection pump and apply
Pressure.
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, it to be used for recovery experiment fluid.It can make pressure-resistant capillary tail end pressure and rock core by opening the 5th valve
Clamper 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 device
Interior pressure is to experimental pressure.
In this step, it can realize that core holding unit head and the tail both 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, third valve is opened, controls the second high pressure
Injection pump injection experiments fluid in such a way that ladder boosts, the measurement fluid in the first pressure vessel can be under pressure
Pressure-resistant capillary is gradually flowed into, the pressure difference and electric resistance measuring apparatus that record pressure difference meter measures after boosting is stablized every time measure
Resistance value, according to resistance value calculate flow, according to pressure difference and flow rate calculation apparent permeability.
In this step, so-called ladder boosting is kept after a certain period of time at a pressure, and pressure rapidly increases to another
After pressure, continues to rise after a certain period of time in pressure holding, keep, rise, keep, continue this process.One
Depending on the time that pressure is kept is by the surveyed aggregate resistance value of electric resistance measuring apparatus, when surveyed aggregate resistance value smooth transition
Afterwards, next pressure is risen to.
It can terminate core holding unit both 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 pressure are had access to by closing the 4th valve, opening third valve
The pressure of injection pump injection promotes the Experimental Flowing Object in core holding unit to flow, and then pushes the survey in the first pressure vessel
Amount fluid gradually flows into pressure-resistant capillary.In this step, the first pressure-resistant piston container is as tank is returned, for recycling
Measure fluid.
Step 305：After measuring fluid full of pressure-resistant capillary, third valve and the 5th valve are closed, opens the 4th
Valve and the 6th valve start high pressure micro-flow pump, measurement fluid are made to retract pressure-resistant capillary head end, non-electrically conductive liquid
In injection pressure resistance capillary, the 4th valve, the 6th are closed when electric resistance measuring apparatus institute measuring resistance value is initial resistivity value
Valve and high pressure micro-flow pump, open third valve and the 5th valve.
In this step, micro-flowmeter can be closed by closing third valve and the 5th valve.By opening the 4th valve
It can ensure that experiment continues, the recycling of the second pressure vessel can be made to be retracted out of pressure-resistant capillary by opening the 6th valve
Measurement fluid, the air in the second pressure vessel is compressed, due to the second pressure vessel and the second pressure-resistant piston container
It is connected, therefore, does not will produce big compression.When electric resistance measuring apparatus institute measuring resistance value is initial resistivity value, close
4th valve, the 6th valve and high pressure micro-flow pump can terminate to adjust the liquid in pressure-resistant capillary.Wait for resistance measurement
When device institute measuring resistance value is initial resistivity value, micro-flowmeter can be accessed again by opening third valve and the 5th valve.
Further, further include adjusting the temperature of insulating box to design temperature before above-mentioned steps 302, to simulate
Compact rock core formation temperature.When implementation, need to stand a period of time after temperature is arranged, until each instrument in insulating box
Temperature is stablized after required measuring temperature, and next step is carried out.
Further, the second high head injection pump is controlled in above-mentioned steps 302 and applies pressure, so that rock in core holding unit
Heart sample injection experiments fluid further comprises：
It controls the second high head injection pump and transmits liquid to the second pressure-resistant piston lower vessel portion cavity injection pump pressure, through excess pressure
Transmitting 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 following formula：
Qt=A'(ht-hi0)/(ti-ti0), ht=-aRt+b；
Wherein, QtFor the flow of t moment；A' is the cross-sectional area of pressure-resistant capillary；hi0For the first of pressure-resistant capillary
Beginning liquid level；htFor the liquid level of t moment；tiFor measurement time；ti0At the time of correspondence for ith initial liquid level；RtFor
The resistance value that electric resistance measuring apparatus t moment measures；A and b is constant.
Apparent permeability is calculated by following formula：
Wherein, k is apparent permeability；QtFor the flow of t moment；μ is tested media viscosity；L is rock core length；
A accumulates for rock core overflow section；ΔptThe pressure difference measured for pressure difference meter t moment.
In some embodiments, compact rock core apparent permeability test method further includes testing above-mentioned compact rock core apparent permeability
The analytic 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 following formula：
Wherein, vtFor the flow velocity of t moment；A accumulates for rock core overflow section；QtFor the flow of t moment.
Barometric gradient is calculated by following formula：
Wherein, GtFor the barometric gradient of t moment；ΔptThe pressure difference measured for pressure difference meter t moment；L is that rock is long
Degree.
Step 402：It is fitted the relationship of flow velocity and barometric gradient according to flow velocity and barometric gradient, flow velocity and barometric gradient
Relationship can indicate with the curve of flow velocity and barometric gradient, as shown in figure 5, empty circles are experimental data (i.e. according to note
The data that the pressure difference and resistance value of record are calculated), flow velocity is proportional with barometric gradient.
When implementation, specific approximating method can not be 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 relationship of barometric gradient according to flow velocity
Force gradient, as shown in figure 5, the corresponding abscissa value of vertical dotted line is starting pressure gradient.
Further, multiple referring to Fig. 4, further including other than calculating starting pressure gradient：
Step 404：It is fitted the relationship of flow velocity and apparent permeability according to flow velocity and apparent permeability, flow velocity and apparent permeability
Relationship can be indicated with flow velocity and apparent permeability curve, as shown in fig. 6, black circles are experimental data.
When implementation, specific approximating method can not be limited by least square fitting curve, the application.
Step 405：Corresponding apparent permeability is to start when determining that flow velocity tends to 0 with the relationship of apparent permeability according to flow velocity
Permeability (the k in such as Fig. 60), corresponding apparent permeability is the limit permeability when flow velocity tends to infinite (sufficiently large)
(the k in such as Fig. 6∞)。
Step 406：The attenuation coefficient of apparent permeability is determined according to the relationship of flow velocity and apparent permeability.Apparent permeability declines
Subtract the speed that coefficient characterization 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 declining for apparent permeability
Subtract coefficient；G is barometric gradient；G0For starting pressure gradient.
Compact rock core apparent permeability test method provided by the present application can be realized under normal temperature and pressure-high temperature and high pressure environment
The accurate of compact rock core gas (or liquid) apparent permeability measures and the seepage flow of the compact rock core under the influence of various factors spy
The Quantitative study of property.Its pressure limit is 0.1MPa~80MPa, and temperature range at 0~200 DEG C, survey by flow
Measure ranging from 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., which is situated between
Matter includes the program of storage, and equipment where control storage medium executes described in any of the above-described embodiment when program is run
The step of compact rock core apparent permeability test method.
The embodiment of the present application also provides a kind of processor, which executes above-mentioned for running program, program when running
Described in any embodiment the step of compact rock core apparent permeability test method.
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
Please can be used one or more wherein include computer usable program code computer-usable storage medium (including
But be not limited to magnetic disk storage, CD-ROM, optical memory etc.) on the form of computer program product implemented.
It should be understood that each flow and/or block in flowchart and/or the block diagram, Yi Jiliu can be realized by computer program instructions
The combination of flow and/or box in journey figure and/or block diagram.These computer program instructions can be provided to general-purpose computations
Machine, special purpose computer, Embedded Processor or other programmable data processing devices processor to generate a machine,
So that being generated by the instruction that computer or the processor of other programmable data processing devices execute for realizing flowing
The device for the function of being specified in one flow of journey figure or multiple flows and/or one box of block diagram or multiple boxes.
These computer program instructions, which may also be stored in, can guide computer or other programmable data processing devices with spy
Determine in the computer-readable memory that mode works so that instruction stored in the computer readable memory generates packet
The manufacture of command device is included, which realizes in one flow of flow chart or multiple flows and/or block diagram one
The function of being specified in a box or multiple boxes.
These computer program instructions also can be loaded onto a computer or other programmable data processing device so that count
Series of operation steps are executed on calculation machine or other programmable devices to generate computer implemented processing, to calculate
The instruction that is executed on machine or other programmable devices provide for realizing in one flow of flow chart or multiple flows and/or
The step of function of being specified in one box of block diagram or multiple boxes.
Particular embodiments described above has carried out further in detail the purpose, technical solution and advantageous effect of the application
It describes in detail bright, it should be understood that the foregoing is merely the specific embodiment of the application, is not used to limit this Shen
Protection domain please, within the spirit and principles of this application, any modification, equivalent substitution, improvement and etc. done,
It should be included within the protection domain of the application.
Claims (14)
1. a kind of compact rock core apparent permeability test device, which is characterized in that including：It is core holding unit, first high
Press injection pump, the second high head injection pump, pressure difference meter, the first pressure-resistant piston container, micro-flowmeter, the first valve
Door, the second valve, third valve, the 4th valve and the 5th valve, wherein the first pressure-resistant piston container passes through
Piston is divided into upper chamber and lower cavity, and the first pressure-resistant piston upper vessel portion cavity is equipped with gas, the first pressure resistance
Piston lower vessel portion cavity transmits liquid equipped with pump pressure；
Core holding unit is for accommodating core sample；
First high head injection pump connects core holding unit second entrance, for adjusting confining pressure；
Second high head injection pump connects core holding unit first entrance, passes through the first pressure-resistant piston of the first valve connection
Upper vessel portion cavity, by the first pressure-resistant piston lower vessel portion cavity of the second valve connection, for providing pressure simultaneously
To core sample injection experiments 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 outlet by the 4th valve；
Micro-flowmeter is connected between the first pressure-resistant piston upper vessel portion cavity and core holding unit outlet, for surveying
Measure flow, including the first pressure vessel, the second pressure vessel, high pressure micro-flow pump, pressure-resistant capillary, resistance
Measuring device and the 6th valve；
Measurement fluid is equipped in first pressure vessel, first pressure vessel one end connects rock core by third valve
Clamper exports, first pressure vessel other end connection pressure resistance capillary head end；
Gas, the first pressure-resistant piston upper vessel portion of second pressure vessel one end connection are equipped in second pressure vessel
Cavity, the second pressure vessel other end connect pressure-resistant capillary head end by the 6th valve；
Pressure-resistant capillary tail end connection high pressure micro-flow pump, by the first pressure-resistant piston container of the 5th valve connection
Portion's cavity；
Electric resistance measuring apparatus is connected to pressure-resistant capillary both ends by signal wire.
2. compact rock core apparent permeability test device as described in claim 1, which is characterized in that further include second
Pressure-resistant piston container is divided into upper chamber and lower cavity by piston, and the second pressure-resistant piston upper vessel portion cavity is built-in
There is Experimental Flowing Object, pump pressure, which is housed, in the second pressure-resistant piston lower vessel portion cavity transmits liquid；
Second pressure-resistant piston upper vessel portion cavity connects core holding unit first entrance, the second pressure-resistant piston lower vessel portion chamber
Body connects the second high head injection pump, and the pump pressure for receiving the injection of the second high head injection pump transmits liquid, makes by pressure transmission
Experimental Flowing Object in second pressure-resistant 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 described in claim 1, which is characterized in that further include calculating
Machine, the first high head injection pump of connection, the second high head injection pump, pressure difference meter, the first valve, the second valve, high pressure
Micro-flow pump, electric resistance measuring apparatus, third valve, the 4th valve, the 5th valve and the 6th valve.
4. compact rock core apparent permeability test device as described in claim 1, which is characterized in that further include constant temperature
Case is equipped with core holding unit, the first pressure vessel, the second pressure vessel, pressure-resistant capillary in insulating box,
For providing temperature.
5. compact rock core apparent permeability test device as described in claim 1, which is characterized in that the resistance to dabbing
One section of non conducting fluid immiscible with fluid is measured is provided in tubule.
6. compact rock core apparent permeability test device as described in claim 1, which is characterized in that described first is resistance to
Pressure vessel and the second pressure vessel are vertically arranged.
7. compact rock core apparent permeability test device as described in claim 1, which is characterized in that Experimental Flowing Object packet
Oil, water, polymer are included, measurement fluid is conducting liquid.
8. a kind of compact rock core apparent permeability test method, which is characterized in that it is any to be suitable for claim 1 to 7
Compact rock core apparent permeability test device described in, including：
Core sample is fitted into core holding unit, confining 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 experiments fluid measures after pressure difference meter and stops the second high head injection pump pressure after pressure difference is stablized；
Open the first valve and the second valve, 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, opens third valve, the second high head injection pump of control is with rank
The mode injection experiments fluid of ladder boosting, the measurement fluid in the first pressure vessel gradually flow into pressure resistance under pressure
Capillary, the resistance value that the pressure difference and electric resistance measuring apparatus that record pressure difference meter measures after boosting is stablized every time measure, root
Flow is calculated according to resistance value, according to pressure difference and flow rate calculation apparent permeability；
After measuring fluid full of pressure-resistant capillary, third valve and the 5th valve are closed, opens the 4th valve and the 6th
Valve starts high pressure micro-flow pump, so that measurement fluid is retracted pressure-resistant capillary head end, wait for the surveyed electricity of electric resistance measuring apparatus
The 4th valve, the 6th valve and high pressure micro-flow pump are closed when resistance value is initial resistivity value, open third valve and the 5th
Valve.
9. compact rock core apparent permeability test method as claimed in claim 8, which is characterized in that control second is high
Injection pump is pressed to apply pressure, so that core sample injection experiments fluid further comprises in core holding unit：
It controls the second high head injection pump and transmits liquid to the second pressure-resistant piston lower vessel portion cavity injection pump pressure, through excess pressure
Transmitting makes the Experimental Flowing Object in the second pressure-resistant piston upper vessel portion cavity flow into core sample.
10. compact rock core apparent permeability test method as claimed in claim 8, which is characterized in that by following public
Formula calculates flow：
Qt=A'(ht-hi0)/(ti-ti0), ht=-aRt+b；
Wherein, QtFor the flow of t moment；A' is the cross-sectional area of pressure-resistant capillary；hi0For the first of pressure-resistant capillary
Beginning liquid level；htFor the liquid level of t moment；tiFor measurement time；ti0At the time of correspondence for ith initial liquid level；RtFor
The resistance value that electric resistance measuring apparatus t moment measures；A and b is constant.
11. compact rock core apparent permeability test method as claimed in claim 8, which is characterized in that by following public
Formula calculates apparent permeability：
Wherein, k is apparent permeability；QtFor the flow of t moment；μ is tested media viscosity；L is rock core length；
A accumulates for rock core overflow section；ΔptThe pressure difference measured for pressure difference meter t moment.
12. compact rock core apparent permeability test method as claimed in claim 8, which is characterized in that further include：
According to flow rate calculation flow velocity, barometric gradient is calculated according to pressure difference；
The relationship of flow velocity and barometric gradient is fitted according to flow velocity and barometric gradient；
Corresponding barometric gradient is starting pressure gradient when determining that flow velocity is 0 with the relationship of barometric gradient according to flow velocity.
13. compact rock core apparent permeability test method as claimed in claim 12, which is characterized in that further include：
The relationship of flow velocity and apparent permeability is fitted according to flow velocity and apparent permeability；
Corresponding apparent permeability is to start permeability when determining that flow velocity tends to 0 with the relationship of apparent permeability according to flow velocity, stream
Corresponding apparent permeability is the limit permeability when speed tends to infinite；
The attenuation coefficient of apparent permeability is determined according to the relationship of flow velocity and apparent permeability.
14. compact rock core apparent permeability test method as claimed in claim 13, which is characterized in that according to rock core
Penetration theory, the calculation formula for obtaining compact rock core apparent permeability are：
Wherein, k is apparent permeability；k∞For limit permeability；k0To start permeability；C is declining for apparent permeability
Subtract coefficient；G is barometric gradient；G0For starting pressure gradient.
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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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| CN201710492533.XA CN107167413B9 (en) | 2017-06-26 | 2017-06-26 | A kind of compact rock core apparent permeability test device and test method |
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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 |
| CN111044427B (en) * | 2018-10-15 | 2022-08-30 | 中国石油天然气股份有限公司 | Core sulfur analysis system |
| CN111044412B (en) * | 2018-10-15 | 2022-08-05 | 中国石油天然气股份有限公司 | Deposited sulfur source distinguishing system |
| CN110146424B (en) * | 2019-05-08 | 2021-02-02 | 中国石油大学(北京) | Device and method for simulating stratum respiration effect |
| 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 |
| 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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| EP2006702A2 (en) * | 2007-06-08 | 2008-12-24 | University of New Brunswick | Methods suitable for measuring capillary pressure and relative permeability curves of porous rocks |
| CN104237107A (en) * | 2014-10-20 | 2014-12-24 | 中国科学技术大学 | Method and system for interpreting apparent permeability of low-permeability reservoir in formation |
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| CN104237107A (en) * | 2014-10-20 | 2014-12-24 | 中国科学技术大学 | Method and system for interpreting apparent permeability of low-permeability reservoir in formation |
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