CN108680481A - Permeability saturation curve test method and device - Google Patents
Permeability saturation curve test method and device Download PDFInfo
- Publication number
- CN108680481A CN108680481A CN201810459563.5A CN201810459563A CN108680481A CN 108680481 A CN108680481 A CN 108680481A CN 201810459563 A CN201810459563 A CN 201810459563A CN 108680481 A CN108680481 A CN 108680481A
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- measured
- rock core
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- water
- injection
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/0806—Details, e.g. sample holders, mounting samples for testing
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume, or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
Abstract
A kind of permeability saturation curve test method of present invention offer and device, this method coats rock core to be measured by using isolating device, it can achieve the purpose that sealing, therefore, when testing the grease Relative permeability curve of rock core to be measured, core holding unit need not be reused, rock core to be measured is clamped, but directly rock core to be measured can be placed on electronic balance and carry out oil, water injection and mass measurement.Therefore, it can avoid the occurrence of and be put back to because taking out rock core to be measured from core holding unit, in the case where causing the quality of the rock core to be measured measured by electronic balance to be not rock core to be measured actual quality and measurement process the case where fluid loss, and then improve relative permeability, the efficiency of the relative permeability of water phase of the relative permeability of the corresponding oil phase of rock core different water cut saturation degree to be measured, the precision of the relative permeability of water phase oil phase corresponding with rock core different water cut saturation degree to be measured is tested.
Description
Technical field
The present invention relates to Oil Well Detecting technology more particularly to a kind of permeability saturation curve test method and devices.
Background technology
Oil-water relative permeability curve be oil-water two-phase flow feature combined reaction and oil-water two-phase flow during
The basic law that must comply with.After oil field development enters high water-cut stage, the oil and water zonation rule and preservation situation in reservoir are in
Low Water-cut Period is compared to being very different, and remaining oil is discontinuous by being continuously transformed into before in reservoir.This phenomenon can make phase
Larger change is occurred to permeability curve morphological feature, and then influences grease flowing law and production liquid rule in reservoir.Therefore, exist
When working out oilfield development program, analysis and oil reservoir prediction displacement dynamic, oil-water relative permeability curve is indispensable experiment
Data.
Currently, mainly testing oil-water relative permeability curve by following methods.Specifically, by with the rock stratum object in reservoir
The consistent artificial core of property is placed in core holding unit, to seal artificial core by core holding unit.Then, pass through rock core
Oily (such as refined oil), water are injected artificial core by the fluid inflow line of clamper in the ratio constant speed of setting.Often inject one
After kind ratio, artificial core is taken out from core holding unit and is put into the quality for measuring artificial core on electronic balance.Pass through change
Oil-water ratio, and, it is corresponding that artificial core different water cut saturation degree can be obtained in the quality of the corresponding artificial core of each ratio
The relative permeability of oil phase, the relative permeability of water phase.The relative permeability of relative permeability, water phase based on these oil phases,
The oil-water relative permeability curve of artificial core can be drawn.Through the oil-water relative permeability curve, it can reflect reservoir
In rock stratum (consistent with artificial core physical property) grease flowing law and production liquid rule.
However, when artificial core is taken out from core holding unit, be present in inside artificial core fluid (oil and/
Or water) understand some outflow, it is not the actual quality of artificial core to lead to the quality of the artificial core measured by electronic balance,
And then the relative permeability, the relative permeability of water phase of the corresponding oil phase of artificial core different water cut saturation degree obtained by causing
Precision is relatively low.
Invention content
The present invention provides a kind of permeability saturation curve test method and device, for solve to be measured in the prior art
The relative permeability of the corresponding oil phase of artificial core different water cut saturation degree, the lower technology of precision of the relative permeability of water phase
Problem.
First aspect present invention provides a kind of permeability saturation curve test method, and this method includes：
The method is applied to rock core to be measured, and isolating device, the isolating device packet are provided with outside the rock core to be measured
It includes：First separation layer, the second separation layer, first end cover, second end cover, the first filter device, the second filter device, first are led
Pipe, the second conduit, the first end cover are provided with the first through hole being adapted to first catheter shape, and the second end cover is set
It is equipped with the second through-hole being adapted to second catheter shape；
The first separation layer cladding rock core to be measured forms first shell, and the first end cover passes through first mistake
Filter device is covered in the first end of the first shell, and the second end cover is covered in described the by second filter device
The second end of one shell, second separation layer are covered with the first shell of the first end cover and the second end cover,
First conduit is threaded through in the first through hole, and for injecting fluid to the rock core to be measured, second conduit is worn
In second through-hole, the fluid for the rock core outflow to be measured to be discharged；
The method includes：
Obtain the irreducible water saturation of the rock core to be measured；
Obtain oil phase effective permeability of the rock core to be measured under irreducible water saturation；
Obtain test data of the rock core to be measured under the injection of each oil-water ratio；
According to the test number of the parameter information of the rock core to be measured, the rock core to be measured under the injection of each oil-water ratio
According to, oil phase effective permeability of the rock core to be measured under irreducible water saturation, determine the rock core to be measured in each oil
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under the injection of water ratio；
According to the irreducible water saturation of the rock core to be measured, and, the rock core to be measured is noted in each described oil-water ratio
The relative permeability of oil phase under entering, the relative permeability of water phase, water saturation, the grease for drawing the rock core to be measured are opposite
Permeability curve.
In a kind of possible embodiment, the length of the rock core to be measured is greater than or equal to preset length.
In a kind of possible embodiment, the preset length is 30 centimetres.
In a kind of possible embodiment, the test data includes：Oil phase under current oil-water ratio injection it is steady
The both ends of constant flow, the oily viscosity under the injection of current oil-water ratio, the rock core to be measured under the injection of current oil-water ratio
Pressure difference, the regime flow of the lower water phase of current oil-water ratio injection, current oil-water ratio inject under water viscosity, described to be measured
Quality of the rock core under the injection of current oil-water ratio, the density of the oil under the injection of current oil-water ratio, the injection of current oil-water ratio
Under water density.
In a kind of possible embodiment, the parameter information of the rock core to be measured, including：The length of the rock core to be measured
The pore volume of degree, the sectional area of the rock core to be measured, the rock core to be measured.
Second aspect of the present invention provides a kind of permeability saturation curve test device, which includes：
Described device is applied to rock core to be measured, and isolating device, the isolating device packet are provided with outside the rock core to be measured
It includes：First separation layer, the second separation layer, first end cover, second end cover, the first filter device, the second filter device, first are led
Pipe, the second conduit, the first end cover are provided with the first through hole being adapted to first catheter shape, and the second end cover is set
It is equipped with the second through-hole being adapted to second catheter shape；
The first separation layer cladding rock core to be measured forms first shell, and the first end cover passes through first mistake
Filter device is covered in the first end of the first shell, and the second end cover is covered in described the by second filter device
The second end of one shell, second separation layer are covered with the first shell of the first end cover and the second end cover,
First conduit is threaded through in the first through hole, and for injecting fluid to the rock core to be measured, second conduit is worn
In second through-hole, the fluid for the rock core outflow to be measured to be discharged；
Described device includes：
First acquisition module, the irreducible water saturation for obtaining the rock core to be measured；
Second acquisition module, for obtaining oil phase effective permeability of the rock core to be measured under irreducible water saturation；
Third acquisition module, for obtaining test data of the rock core to be measured under the injection of each oil-water ratio；
Computing module, for being noted in each oil-water ratio according to parameter information, the rock core to be measured of the rock core to be measured
The oil phase effective permeability of test data, the rock core to be measured under irreducible water saturation under entering, determines the rock core to be measured
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under each described oil-water ratio injection；
Drafting module, according to the irreducible water saturation of the rock core to be measured, and, the rock core to be measured is in each oil
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under the injection of water ratio, draw the rock core to be measured
Oil-water relative permeability curve.
In a kind of possible embodiment, the length of the rock core to be measured is greater than or equal to preset length.
In a kind of possible embodiment, the preset length is 30 centimetres.
In a kind of possible embodiment, the test data includes：Oil phase under current oil-water ratio injection it is steady
The both ends of constant flow, the oily viscosity under the injection of current oil-water ratio, the rock core to be measured under the injection of current oil-water ratio
Pressure difference, the regime flow of the lower water phase of current oil-water ratio injection, current oil-water ratio inject under water viscosity, described to be measured
Quality of the rock core under the injection of current oil-water ratio, the density of the oil under the injection of current oil-water ratio, the injection of current oil-water ratio
Under water density.
In a kind of possible embodiment, the parameter information of the rock core to be measured, including：The length of the rock core to be measured
The pore volume of degree, the sectional area of the rock core to be measured, the rock core to be measured.
Third aspect present invention provides a kind of permeability saturation curve test device, which includes：At least one processing
Device and memory；
The memory stores computer executed instructions；At least one processor executes the meter of the memory storage
Calculation machine executes instruction, to execute first aspect any one of them method.
Fourth aspect present invention provides a kind of computer readable storage medium, is stored in the computer readable storage medium
Program instruction, described program instruction realize first aspect any one of them method when being executed by processor.
Permeability saturation curve test method provided by the invention and device, by using isolating device to rock core to be measured into
Row cladding, can achieve the purpose that sealing, therefore, need not be again when testing the oil-water relative permeability curve of rock core to be measured
Rock core to be measured is clamped using core holding unit, but directly rock core to be measured can be placed on electronic balance and carry out oil, water note
Enter and mass measurement.It can thus be avoided occurring putting back to because taking out rock core to be measured from core holding unit, lead to electronic balance
Not the case where quality of measured rock core to be measured is not rock core to be measured actual quality, and then improve rock core different water cut to be measured
The relative permeability of the corresponding oil phase of saturation degree, the precision of the relative permeability of water phase.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of structural schematic diagram of isolating device provided by the invention；
Fig. 2 is the structural schematic diagram of the test device of rock core to be measured provided by the invention；
Fig. 3 is the flow diagram of permeability saturation curve test method provided by the invention；
Fig. 4 is the structural schematic diagram of permeability saturation curve test device provided by the invention；
Fig. 5 is the structural schematic diagram of another permeability saturation curve test device provided by the invention.
Reference numeral：
01：Rock core to be measured； 02：First separation layer；
03：Second separation layer； 04：First end cover；
05：Second end cover； 06：First filter device；
07：Second filter device； 08：First conduit；
09：Second conduit； 10：First through hole；
11：Second through-hole； 12：Constant-flux pump；
13：Constant-flux pump； 14：Piston container；
15：Piston container； 16：Six-way valve；
17：Pressure sensor； 18：Electronic balance；
19：Insulating box； 20：Oil water separator.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other without creative efforts
Embodiment shall fall within the protection scope of the present invention.
Currently, mainly testing oil-water relative permeability curve by following methods.Specifically, by with the rock stratum object in reservoir
The consistent artificial core of property is placed in core holding unit, to seal artificial core by core holding unit.Then pass through rock core
Oily (such as refined oil), water are injected artificial core by the fluid inflow line of clamper in the ratio constant speed of setting.Often inject one
After kind oil-water ratio, artificial core is taken out from core holding unit and is put into the quality for measuring artificial core on electronic balance.Pass through
Change oil-water ratio, and, artificial core different water cut saturation degree pair can be obtained in the quality of the corresponding artificial core of each ratio
The relative permeability for the oil phase answered, the relative permeability of water phase.The opposite infiltration of relative permeability, water phase based on these oil phases
Rate can draw the oil-water relative permeability curve of artificial core.Through the oil-water relative permeability curve, it can reflect storage
The grease flowing law and production liquid rule of rock stratum (consistent with artificial core physical property) in layer.
However, when artificial core is taken out from core holding unit, be present in inside artificial core fluid (oil and/
Or water) understand some outflow, it is not the actual quality of artificial core to lead to the quality of the artificial core measured by electronic balance,
And then the relative permeability, the relative permeability of water phase of the corresponding oil phase of artificial core different water cut saturation degree obtained by causing
Precision is relatively low.
In view of the above problem, the present invention provides a kind of permeability saturation curve test method, this method by using
Isolating device coats rock core to be measured, can achieve the purpose that sealing, therefore, is oozed relatively in the grease for testing rock core to be measured
When saturating rate curve, core holding unit need not be reused, rock core to be measured is clamped, but can rock core to be measured be directly placed on electricity
Oil, water injection and mass measurement are carried out on sub- balance.It can thus be avoided occurring because taking rock core to be measured from core holding unit
The case where going out to put back to, the quality of the rock core to be measured measured by electronic balance is caused to be not rock core to be measured actual quality, Jin Erti
High relative permeability, the precision of the relative permeability of water phase of the corresponding oil phase of rock core different water cut saturation degree to be measured.
It is appreciated that above-mentioned described rock core to be measured can be the rock core consistent with the rock stratum physical property in reservoir, for example, people
The lithogenesis heart or the rock core etc. for using the rock stratum of a certain reservoir to make.The present invention is to rock core shape to be measured without restriction, example
Such as, rock core to be measured can be cylinder, cuboid etc..When rock core to be measured is cylinder, the diameter of rock core to be measured for example can be with
It it is 2.5 centimetres or 3.8 centimetres, the length of rock core to be measured can for example be not less than 1.5 times of the diameter of rock core to be measured.When rock to be measured
When the heart is cuboid, the height of rock core to be measured is simultaneously for example, at least the length of rock core to be measured and wide 1.5 times.
Technical scheme of the present invention is described in detail below by specific embodiment.These are specific real below
Applying example can be combined with each other, and same or analogous concept or process may be repeated no more in some embodiments.
Fig. 1 is a kind of structural schematic diagram of isolating device provided by the invention.As shown in Figure 1, being set outside rock core 01 to be measured
The isolating device set includes：First separation layer 02, the second separation layer 03, first end cover 04, second end cover 05, the first filter device
06, the second filter device 07, the first conduit 08, the second conduit 09, first end cover are provided be adapted to the first catheter shape
One through-hole 10, second end cover are provided with the second through-hole 11 being adapted to the second catheter shape.
First separation layer 02 coats rock core 01 to be measured and forms first shell, and first end cover 04 is covered by the first filter device 06
Cover the first end in first shell, second end cover 05 is covered in the second end of first shell by the second filter device 07, and second
Separation layer 03 is covered with the first shell of first end cover 04 and second end cover 05, and it is logical that the first conduit 08 is threaded through described first
In hole 10, for injecting fluid to rock core 01 to be measured, the second conduit 09 is threaded through in the second through-hole 11, for rock core to be measured to be discharged
The fluid of 01 outflow.
First separation layer 02, such as can be by epoxy resin and curing agent (such as epoxy resin by a certain percentage：Curing agent
It is 50:1) it mixes, for wrapping up rock core 01 to be measured, prevents wall flow phenomenon.
First filter device 06 and the second filter device 07 for example can be gauze, stainless steel mesh, root when specific implementation
The suitable filter device of selection is required according to mesh mesh number, the present invention is to this without limiting.First filter device 06 and second
Filter device 07 is for preventing the solid fraction object (particle gone out by fluid scouring in rock core 01 to be measured) in rock core 01 to be measured with stream
Body (such as oil and/or water) outflow.
First end cover 04 and second end cover 05 for example can be the end cap of epoxy resin material.
First conduit 08 is threaded through in first through hole 10, and the second conduit 09 is threaded through in the second through-hole 11.First conduit 08
Is not limited in the present invention with the material of the second conduit 09, requirement when can be according to specific implementation selects, such as steel can be selected
Pipe, plastic tube.Wherein, the first conduit 08 can be fixed in first through hole 10 by way of clip groove, alternatively, first leads
Pipe 08 can be fixed in first through hole 10 by way of being spirally connected.For example, outside the inner wall of first through hole 10 and the first conduit 08
Wall is provided with matched screw thread, and therefore, the first conduit 08 can be fixed in first through hole 10 by way of being spirally connected.About
How two conduits 09, which are fixed on, may refer to the description that the first conduit 08 is fixed in first through hole 10 in the second through-hole 11, herein
It repeats no more.
Second separation layer 03 for example can be by epoxy resin and curing agent (such as epoxy resin by a certain percentage：Curing agent
It is 100:1) it mixes, the first shell for being covered with first end cover 04 and second end cover 05.
Rock core 01 to be measured can be coated by above-mentioned isolating device, achievees the purpose that sealing rock core 01 to be measured.
After being coated to rock core 01 to be measured, following test device can be used to obtain the oil-water relative permeability for drawing rock core 01 to be measured
Data needed for curve.
Fig. 2 is the structural schematic diagram of the test device of rock core to be measured provided by the invention.As shown in Fig. 2, the test device
Including：Constant-flux pump 12, constant-flux pump 13, piston container 14, piston container 15, six-way valve 16, pressure sensor 17, electronic balance
18, insulating box 19, oil water separator 20.Piston container 14 is stored with oil, and piston container 15 is stored with water.
Constant-flux pump 12 is connect with the control terminal of piston container 14, and constant-flux pump 13 is connect with the control terminal of piston container 15, living
The output end of plug container 14 is connect with the first input end of six-way valve 16, the output end of piston container 15 and the second of six-way valve 16
Input terminal connects.The output end in six-way valve 16 is arranged in pressure sensor 17.
19 both sides of insulating box are provided with the through-hole of 09 shape adaptation of the first conduit 08 and the second conduit of isolating device, electronics
Balance 18 is arranged inside insulating box 19, and the rock core to be measured 01 that outside is provided with isolating device is placed on electronic balance 19, every
The first conduit 08 and the second conduit 09 from device are extended to by the through-hole of 19 both sides of insulating box outside insulating box 19, wherein
One end that first conduit 08 extends to outside insulating box 19 is connect with the output end of six-way valve 16, and the second conduit 09 extends to constant temperature
One end outside case 19, the fluid for flowing out rock core 01 to be measured drain into oil water separator 20.
Constant-flux pump 12, for driving the oil in piston container 14 and controlling oily flow.Constant-flux pump 13, for driving piston
Water in container 15 and the flow for controlling water.The oil for driving in piston container 14 enters isolating device by six-way valve 16
First conduit 08, to be flowed into rock core 01 to be measured by the first conduit 08.The water for driving out in piston container 15 is logical by six
Valve 16 enters the first conduit 08 of isolating device, to be flowed into rock core 01 to be measured by the first conduit 08.Although it is above-mentioned Fig. 2 shows
It is six-way valve, but while implementing can also be realized using other valves, such as triple valve, four-way valve, it specifically can be with
It is determined according to the number of, lines of required connection, the present invention is to this without limiting.
Pressure sensor 17, the pressure for measuring the fluid for flowing into rock core 01 to be measured by the output end of six-way valve 16.
Electronic balance 18, the quality for measuring rock core 01 to be measured.When specific implementation, it is isolated rock core 01 to be measured is arranged
Before device, the quality that rock core 01 to be measured is dried and measured to rock core 01 to be measured is needed.It is isolated rock core 01 to be measured is arranged
After device, measure setup has the quality of the rock core to be measured 01 of isolating device again.Two quality are subtracted each other, you can obtain being arranged
The quality of isolating device outside rock core 01 to be measured.The process of the quality of rock core 01 to be measured is measured using electronic balance 18 in the later stage
In, by the quality that isolating device is arranged in electronic balance 18 so that electronic balance 18 has isolating device by measure setup
Rock core to be measured 01, still can obtain the quality of rock core 01 to be measured.That is, electronic balance 18 can will be provided with isolating device
The quality of rock core 01 to be measured subtracts the difference obtained after the quality of isolating device, and the quality as rock core 01 to be measured is shown.
Incubator 19 is for keeping the temperature of rock core 01 to be measured constant.
The fluid that oil water separator 20 is used to flow out in rock core 01 to be measured carries out water-oil separating, and reads grease body respectively
Product.Although being oil water separator shown in above-mentioned Fig. 3, other can also be used to carry volume volume markings when implementing
Container realize that such as measuring cup etc., the present invention is to this without limiting.
Below based on above-mentioned test device, permeability saturation curve test method provided by the invention is illustrated.
Fig. 3 is the flow diagram of permeability saturation curve test method provided by the invention.Side provided by the present invention
The executive agent of method can be the processing equipment for having processing function, such as：Computer, server etc..As shown in figure 3, the party
Method includes：
S101, the irreducible water saturation for obtaining rock core to be measured.
Specifically, the external rock core to be measured 01 that be provided with isolating device first can be placed on electronic balance 18 by tester
On, measure the quality of the external rock core to be measured 01 for being provided with isolating device.Outside is provided with waiting for for isolating device by tester
It surveys rock core 01 and vacuumizes saturation " simulated formation water ", and the outside after saturation simulation water flooding is provided with the to be measured of isolating device
Rock core 01 is placed on again on the electronic balance 18 in test device.
Then, tester can carry out oily drive by test device to the rock core to be measured 01 after saturation simulation water flooding
It replaces.When specific implementation, tester can drive piston container 14 to inject oil to rock core 01 to be measured by constant-flux pump 12, and pass through
Constant-flux pump 12 controls the flow that piston container 14 injects oil to rock core 01 to be measured, to carry out oily expelling water to rock core 01 to be measured.Right
When rock core 01 to be measured carries out oily displacement water outlet, oily flow can gradually increase in piston container 14, until rock core 01 to be measured is not
Outflow water.At this point, tester can close constant-flux pump 12, and the water that rock core 01 to be measured flows out is read by oil water separator 20
Volume (i.e. the volume of the oily displacement water outlet of rock core to be measured 01), and by the volume of 01 oily displacement water outlet of rock core to be measured, and, it is to be measured
The pore volume of rock core 01 is input in processing equipment.
Processing equipment is in the oily displacement of pore volume and rock core to be measured 01 for receiving the rock core to be measured 01 of tester's input
After the volume of water outlet, the irreducible water saturation of rock core 01 to be measured can be obtained by formula (1).The formula (1) is specific as follows：
Wherein, VpFor pore volume, the V of rock core 01 to be measuredwVolume, S for 01 oily displacement water outlet of rock core to be measuredwcIt is to be measured
The irreducible water saturation of rock core 01.Above-mentioned Vp、VwUnit it is identical, but used concrete unit, the present invention is to above-mentioned volume
Unit without limit.
S102, oil phase effective permeability of the rock core under irreducible water saturation is obtained.
Specifically, after the irreducible water saturation for getting rock core to be measured, tester can be right by test device
It establishes irreducible water saturation and the rock core to be measured through over recovery wetability carries out oily displacement.Wherein, about it is above-mentioned how
The wetability for restoring rock core to be measured specifically may refer to the prior art, is not added with repeats herein.
When specific implementation, tester can drive piston container 14 to be injected to rock core 01 to be measured by constant-flux pump 12
Oil, and the flow for controlling by constant-flux pump 12 oil that piston container 14 is injected to rock core 01 to be measured (such as passes through and sets constant-flux pump
12 flow parameter, to make constant-flux pump 12 control the flow of piston container 14).At this point, piston container 14 is to 01 note of rock core to be measured
The flow of the oil entered remains unchanged.
In the oil that piston container 14 is injected to rock core 01 to be measured up to after 10 times of 01 pore volumes of rock core to be measured, tester can
By the flow parameter for reading constant-flux pump 12, to obtain the flow (oil that i.e. piston container 14 is injected to rock core 01 to be measured of oil phase
Flow), by reading the pressure value of pressure sensor 17, the pressure for obtaining the fluid of 01 input terminal of rock core to be measured (flows into
The pressure of the fluid of rock core 01 to be measured).Then, tester can be by the flow of above-mentioned oil phase, the viscosity of oil, rock core to be measured 01
The pressure of the fluid of input terminal, rock core to be measured 01 output end fluid pressure (pressure value is identical as atmospheric pressure value),
The length of rock core 01 to be measured and the sectional area of rock core to be measured 01 are input to processing equipment.
Processing equipment is receiving the flow of oil phase of tester's input, the viscosity of oil, rock core to be measured 01 input terminal
The pressure of fluid, the pressure (pressure value is identical as atmospheric pressure value) of fluid of output end of rock core to be measured 01, rock core to be measured
After the sectional area of 01 length and rock core to be measured 01, rock core to be measured 01 can be obtained in irreducible water saturation by formula (2)
Under oil phase effective permeability.The formula (2) is specific as follows：
Wherein, K (Swc) it is oil phase effective permeability of the rock core 01 to be measured under irreducible water saturation, QoFor the stream of oil phase
Amount, μoFor oil viscosity, L be the length of rock core 01 to be measured, A is the sectional area of rock core 01 to be measured, Δ P is 01 both ends of rock core to be measured
The pressure difference of fluid, that is, the pressure (pressure for flowing into the fluid of rock core 01 to be measured) of the fluid of 01 input terminal of rock core to be measured with wait for
Survey the difference of the pressure (pressure value is identical as atmospheric pressure value) of the fluid of the output end of rock core 01.
Then, tester can continue to carry out oily displacement to rock core 01 to be measured, and current to processing equipment input again
Carry out the flow of oil phase when oily displacement, the viscosity of oil, the pressure of fluid of 01 input terminal of rock core to be measured, rock core to be measured 01 it is defeated
The pressure (pressure value is identical as atmospheric pressure value) of the fluid of outlet, section of the length of rock core to be measured 01 and rock core to be measured 01
Area.Correspondingly, these data that processing equipment can be inputted according to tester obtain the oil phase of rock core 01 to be measured again
Effective permeability.
It is recycled with this, when between the oil phase effective permeability for the rock core to be measured 01 that continuous several times (such as 3 times) are tested
When error is less than or equal to default error threshold, processing equipment determines that the oil phase effective permeability of rock core 01 to be measured is available.At this point,
The oil phase effective permeability for the rock core to be measured 01 that processing equipment can once be tested certain in continuous several times is as rock to be measured
The oil phase effective permeability of the heart 01, the oil phase effective permeability for the rock core to be measured 01 that can also be tested continuous several times are averaged
It is worth the oil phase effective permeability as rock core 01 to be measured.
S103, test data of the rock core to be measured under the injection of each oil-water ratio is obtained.
Specifically, after getting oil phase effective permeability of the rock core 01 to be measured under irreducible water saturation, tester
Member can test test data of the rock core 01 to be measured under the injection of each oil-water ratio by test device.Above-mentioned test data
The flow (flow for the oil that i.e. piston container 14 is injected to rock core 01 to be measured) of quality, oil phase including rock core 01 to be measured, water phase
Flow (flow for the water that i.e. piston container 15 is injected to rock core 01 to be measured), 01 input terminal of rock core to be measured fluid pressure
(pressure for flowing into the fluid of rock core 01 to be measured).
It is constant in the flow velocity of the fluid of 01 input terminal of rock core to be measured by taking one of which oil-water ratio as an example when specific implementation
In the case of, tester can drive piston container 14 to rock core 01 to be measured according to this kind of oil-water ratio by constant-flux pump 12
The oil of injection, and the flow for controlling by constant-flux pump 12 oil that piston container 14 is injected to rock core 01 to be measured (such as passes through setting
The flow parameter of constant-flux pump 12, to make constant-flux pump 12 control the flow of piston container 14).Meanwhile tester can be according to this
Kind oil-water ratio drives the oil that piston container 15 is injected to rock core 01 to be measured by constant-flux pump 13, and is controlled by constant-flux pump 13
Piston container 15 injected to rock core 01 to be measured oil flow (such as by set constant-flux pump 13 flow parameter, to make advection
The flow of 13 control piston container 15 of pump).
When the fluid of this kind of oil-water ratio at least injects the pore volume of 3 times of rock cores 01 to be measured, and rock core to be measured 01
When the pressure difference of the fluid of input terminal and output end is stablized, illustrate the fluid stream dynamic stability inside rock core 01 to be measured.At this point, tester
Member can obtain the stream of oil phase of the rock core 01 to be measured in the case where this kind of oil-water ratio is injected by the flow parameter of reading constant-flux pump 12
Amount (flow for the oil that i.e. piston container 14 is injected to rock core 01 to be measured).By reading the flow parameter of constant-flux pump 13, acquisition waits for
Survey the flow (stream for the water that i.e. piston container 15 is injected to rock core 01 to be measured of water phase of the rock core 01 in the case where this kind of oil-water ratio is injected
Amount).By reading the pressure value of pressure sensor 17, input terminal of the rock core 01 to be measured in the case where this kind of oil-water ratio is injected is obtained
The pressure (pressure for flowing into the fluid of rock core 01 to be measured) of fluid.Rock core 01 to be measured is obtained in this kind of oil by electronic balance 18
Quality under the injection of water ratio.
For each oil, water ratio, rock core 01 to be measured can be obtained through the above steps under the injection of each oil-water ratio
Test data.Wherein, the unlimited location survey of the present invention tries the quantity of used a variety of oil-water ratios when rock core 01 to be measured, and,
The specific ratio of oil, water.For example, oil, water ratio shown in following table 1 may be used：
Table 1
Tester, can be by these after obtaining test data of the rock core 01 to be measured under the injection of each oil-water ratio
Test data is input to processing equipment, so that processing equipment can get rock core 01 to be measured under the injection of each oil-water ratio
Test data.
S104, according to test data under the injection of each oil-water ratio of the parameter information of rock core to be measured, rock core to be measured, wait for
Oil phase effective permeability of the rock core under irreducible water saturation is surveyed, determines oil phase of the rock core to be measured under the injection of each oil-water ratio
Relative permeability, the relative permeability of water phase, water saturation.
Above-mentioned parameter information for example may include the pore volume of rock core 01 to be measured, the length of rock core to be measured 01, rock to be measured
The sectional area of the heart 01.When specific implementation, the parameter information that processing equipment can be inputted by receiving tester obtains above-mentioned ginseng
Number information.
Formula (3) may be used in processing equipment, and it is aqueous full under the injection of each oil-water ratio first to calculate rock core 01 to be measured
And degree.Formula (3) is specific as follows：
Wherein, miIndicate rock core 01 to be measured current oil-water ratio injection under quality, VpIndicate the hole of rock core 01 to be measured
Volume, ρoIndicate density, the ρ of oilwIndicate density, the S of waterwIndicate that rock core 01 to be measured is aqueous full under the injection of current oil-water ratio
And degree.
Processing equipment can be according to the parameter information of rock core 01 to be measured, rock core to be measured 01 under the injection of each oil-water ratio
The oil phase effective permeability of test data, rock core to be measured 01 under irreducible water saturation calculates rock core 01 to be measured using formula (4)
The relative permeability of oil phase under the injection of each oil-water ratio calculates rock core 01 to be measured in each oil-water ratio using formula (5)
The relative permeability of water phase under example injection.Formula (4) and formula (5) are specific as follows：
Wherein, Kro(Sw) it is the effective permeability of oil phase of the rock core 01 to be measured under the injection of current oil-water ratio, Krw(Sw)
The effective permeability of water phase of the rock core 01 to be measured under the injection of current oil-water ratio, K (Swc) indicate rock core to be measured 01 in irreducible water
The effective permeability of oil phase under saturation degree, QoFor flow, the μ of oil phase of the rock core 01 to be measured under the injection of current oil-water ratiooFor
The viscosity of oil of the rock core 01 to be measured under the injection of current oil-water ratio, QwBe rock core 01 to be measured current oil-water ratio injection under
Flow, the μ of water phasewBe rock core 01 to be measured current oil-water ratio injection under the viscosity of water, the length for being rock core 01 to be measured, A
Sectional area, Δ P for rock core 01 to be measured are the pressure difference of rock core 01 to be measured both ends fluid under the injection of current oil-water ratio.It can manage
It solves, the μ under each oil-water ratiooIt may be the same or different.Correspondingly, the μ under each oil-water ratiowCan be identical,
It can be different.
S105, according to the irreducible water saturation of rock core to be measured, and, rock core to be measured each oil-water ratio injection under oil
The relative permeability of phase, the relative permeability of water phase, water saturation, draw the oil-water relative permeability curve of rock core to be measured.
Specifically, the abscissa of oil-water relative permeability curve coordinate system is water saturation, ordinate is opposite infiltration
Rate.Wherein, the starting point of abscissa is the irreducible water saturation of rock core 01 to be measured.
When drawing the oil-water relative permeability curve of rock core 01 to be measured, rock core 01 to be measured is injected in each oil-water ratio
Under the water saturation abscissa point lower as the injection of this kind of oil-water ratio, rock core 01 to be measured is under this kind of oil-water ratio injection
The relative permeability of oil phase, the relative permeability of water phase injected as this kind of oil-water ratio under ordinate point.Pass through these
Abscissa point and ordinate point mark rock core 01 to be measured to be noted in each oil-water ratio in oil-water relative permeability curve coordinate system
The position of the relative permeability of oil phase under entering, the relative permeability of water phase in oil-water relative permeability curve coordinate system.Most
Afterwards, the relative permeability of the oil phase under all oil-water ratios being injected is sequentially connected, and obtains the opposite of the oil phase of rock core 01 to be measured
Permeability curve.The relative permeability of water phase under all oil-water ratios are injected is sequentially connected, and obtains the water of rock core 01 to be measured
The permeability saturation curve of phase.Through the oil-water relative permeability curve, the rock stratum in reservoir can be reflected (with rock core to be measured
Physical property is consistent) grease flowing law and production liquid rule so that oil field development personnel can pass through the oil-water relative permeability
Curve, establishment oilfield development program, analysis and oil reservoir prediction displacement dynamic.
It should be noted that when testing the oil-water relative permeability curve of rock core to be measured, fluid flows in rock core to be measured
Can be by hollow billet force effect when dynamic, but fluid does not just have hollow billet force effect, i.e. hollow billet to lose after the outflow of the end face of rock core to be measured
Continuity.It is injected in the test process of rock core to be measured carrying out different oil-water ratios, since the fluid ability of water is than oily flowing
Ability is strong, and such case can cause oil to be detained in away from rock core outlet end to be measured a distance, cause the oil-containing in this region
Saturation degree is higher, water saturation is relatively low, and then causes the water saturation of rock core to be measured relatively low.
In addition, when rock core to be measured is in high water-cut stage, fluid flow resistance weakens, and especially the fluid ability of water increases
By force, if rock core length to be measured is shorter, the pressure difference at rock core both ends to be measured changes unobvious, leads to the oil of measured rock core to be measured
The relative permeability of phase and the relative permeability of water phase change also unobvious.
When the length of rock core to be measured is greater than or equal to preset length, the water saturation that can improve rock core to be measured is relatively low
The case where, and, the pressure difference that can improve rock core both ends to be measured changes unconspicuous situation.Therefore, the present invention is grown by choosing
Degree carries out above-mentioned calculating more than or equal to the rock core to be measured of preset length, can improve rock core to be measured determined by processing equipment and exist
Relative permeability, the relative permeability of water phase, the accuracy rate of water saturation of oil phase under the injection of each oil-water ratio, in turn
Improve precision of the grease with respect to permeability saturation curve for the rock core to be measured drawn.
It is appreciated that above-mentioned described preset length can specifically be set according to testing requirement, for example, the preset length example
It such as can be 30 centimetres, 24 centimetres, 35 centimetres.
Permeability saturation curve test method provided by the invention wraps rock core to be measured by using isolating device
It covers, can achieve the purpose that sealing, therefore, when testing the oil-water relative permeability curve of rock core to be measured, need not reuse
Rock core to be measured is clamped in core holding unit, but directly rock core to be measured can be placed on electronic balance carry out oil, water injection and
Mass measurement.It can thus be avoided occurring putting back to because taking out rock core to be measured from core holding unit, electronic balance is caused to be surveyed
Not the case where quality of the rock core to be measured of amount is not rock core to be measured actual quality, and then improve rock core different water cut saturation to be measured
Spend the relative permeability of corresponding oil phase, the precision of the relative permeability of water phase.
One of ordinary skill in the art will appreciate that：Realize that all or part of step of above method embodiment can pass through
The relevant hardware of program instruction is completed, and program above-mentioned can be stored in a computer read/write memory medium, the program
When being executed, step including the steps of the foregoing method embodiments is executed；And storage medium above-mentioned includes：ROM, RAM, magnetic disc or light
The various media that can store program code such as disk.
Fig. 4 is the structural schematic diagram of permeability saturation curve test device provided by the invention.The permeability saturation curve
Test device can be implemented in combination with some or all of of processing equipment by software, hardware or both.The device application
Isolating device is provided with outside rock core to be measured, rock core to be measured, isolating device includes：First separation layer, the second separation layer, first
End cap, second end cover, the first filter device, the second filter device, the first conduit, the second conduit, first end cover are provided with and the
The first through hole of one catheter shape adaptation, second end cover are provided with the second through-hole being adapted to the second catheter shape；
First separation layer coats rock core to be measured and forms first shell, and first end cover is covered in first by the first filter device
The first end of shell, second end cover are covered in the second end of first shell by the second filter device, and the second separation layer covers
It is stamped the first shell of first end cover and second end cover, the first conduit is threaded through in first through hole, for being injected to rock core to be measured
Fluid, the second conduit are threaded through in the second through-hole, the fluid for rock core outflow to be measured to be discharged.
As shown in figure 4, the permeability saturation curve test device may include：First acquisition module 21, second obtains mould
Block 22, third acquisition module 23, computing module 24 and drafting module 25.Wherein,
First acquisition module 21, the irreducible water saturation for obtaining the rock core to be measured；
Second acquisition module 22, for obtaining oil phase effective permeability of the rock core to be measured under irreducible water saturation；
Third acquisition module 23, for obtaining test data of the rock core to be measured under the injection of each oil-water ratio；
Computing module 24 is used for the parameter information according to the rock core to be measured, the rock core to be measured in each oil-water ratio
The oil phase effective permeability of test data, the rock core to be measured under irreducible water saturation under injection, determines the rock to be measured
Relative permeability, the relative permeability of water phase, the water saturation of oil phase of the heart under each described oil-water ratio injection；
Drafting module 25, according to the irreducible water saturation of the rock core to be measured, and, the rock core to be measured is described in each
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under oil-water ratio injection, draw the rock core to be measured
Oil-water relative permeability curve.
Optionally, the length of the rock core to be measured is greater than or equal to preset length.
Optionally, the preset length is 30 centimetres.
Optionally, the test data includes：The regime flow of oil phase under current oil-water ratio injection, current oil-water ratio
The pressure difference at both ends of the viscosity, the rock core to be measured of the oil under example injection under the injection of current oil-water ratio, current oil-water ratio
The regime flow of water phase under injection, the viscosity of the water under the injection of current oil-water ratio, the rock core to be measured are in current oil-water ratio
The density of quality under example injection, the oily density under the injection of current oil-water ratio, the water under the injection of current oil-water ratio.
Optionally, the parameter information of the rock core to be measured, including：The length of the rock core to be measured, the rock core to be measured
The pore volume of sectional area, the rock core to be measured.
Permeability saturation curve test device provided by the invention, can execute above method embodiment, realization principle
Similar with technique effect, details are not described herein.
Fig. 5 is the structural schematic diagram of another permeability saturation curve test device provided by the invention.As shown in figure 5,
The permeability saturation curve test device may include：At least one processor 26 and memory 27.Fig. 5 is shown with one
Permeability saturation curve test device for processor, wherein
Memory 27, for storing program.Specifically, program may include program code, and said program code includes meter
Calculation machine operational order.Memory 27 may include high-speed RAM memory, it is also possible to further include nonvolatile memory (non-
Volatile memory), a for example, at least magnetic disk storage.
Processor 26 is used to execute the computer executed instructions of the storage of the memory 27, to realize in above-described embodiment
Oil-water relative permeability curve test method, implementing principle and technical effect are similar, and details are not described herein.
Wherein, processor 26 may be a central processing unit (Central Processing Unit, referred to as CPU),
Either specific integrated circuit (Application Specific Integrated Circuit, referred to as ASIC), either
It is configured to implement one or more integrated circuits of the embodiment of the present application.
Optionally, in specific implementation, if communication interface, memory 27 and the independent realization of processor 26, communication connect
Mouth, memory 27 and processor 26 can be connected with each other by bus and complete mutual communication.The bus can be work
Industry standard architecture (Industry Standard Architecture, referred to as ISA) bus, external equipment interconnection
(Peripheral Component, referred to as PCI) bus or extended industry-standard architecture (Extended Industry
Standard Architecture, referred to as EISA) bus etc..The bus can be divided into address bus, data/address bus, control
Bus processed etc., it is not intended that an only bus or a type of bus.
Optionally, in specific implementation, if communication interface, memory 27 and processor 26 are integrated real on one chip
It is existing, then communication interface, memory 27 and processor 26 can be completed by internal interface it is identical between communication.
The present invention also provides a kind of computer readable storage medium, which may include：U
Disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access
Memory), the various media that can store program code such as disk or CD.Specifically, the computer readable storage medium
In have program stored therein instruction, program instruction is used for the method in above-described embodiment.
Finally it should be noted that：The above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Present invention has been described in detail with reference to the aforementioned embodiments for pipe, it will be understood by those of ordinary skill in the art that：Its according to
So can with technical scheme described in the above embodiments is modified, either to which part or all technical features into
Row equivalent replacement；And these modifications or replacements, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (10)
1. a kind of permeability saturation curve test method, which is characterized in that the method is applied to rock core to be measured, the rock to be measured
Isolating device is provided with outside the heart, the isolating device includes：First separation layer, the second separation layer, first end cover, second end
Lid, the first filter device, the second filter device, the first conduit, the second conduit, the first end cover is provided with to be led with described first
The first through hole of tube shape adaptation, the second end cover are provided with the second through-hole being adapted to second catheter shape；
The first separation layer cladding rock core to be measured forms first shell, and the first end cover is filled by first filtering
The first end for being covered in the first shell is set, the second end cover is covered in the first shell by second filter device
The second end of body, second separation layer is covered with the first shell of the first end cover and the second end cover, described
First conduit is threaded through in the first through hole, and for injecting fluid to the rock core to be measured, second conduit is threaded through institute
It states in the second through-hole, the fluid for the rock core outflow to be measured to be discharged；
The method includes：
Obtain the irreducible water saturation of the rock core to be measured；
Obtain oil phase effective permeability of the rock core to be measured under irreducible water saturation；
Obtain test data of the rock core to be measured under the injection of each oil-water ratio；
According to the parameter information of the rock core to be measured, the rock core to be measured each oil-water ratio injection under test data, institute
Oil phase effective permeability of the rock core to be measured under irreducible water saturation is stated, determines the rock core to be measured in each oil-water ratio
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under injection；
According to the irreducible water saturation of the rock core to be measured, and, the rock core to be measured is under each described oil-water ratio injection
Oil phase relative permeability, the relative permeability of water phase, water saturation, the grease for drawing the rock core to be measured opposite permeates
Rate curve.
2. according to the method described in claim 1, it is characterized in that, the length of the rock core to be measured is greater than or equal to default length
Degree.
3. according to the method described in claim 2, it is characterized in that, the preset length is 30 centimetres.
4. according to the method described in claim 1, it is characterized in that, the test data includes：
It is the regime flow of the lower oil phase of current oil-water ratio injection, the oily viscosity under the injection of current oil-water ratio, described to be measured
The regime flow, current of the pressure difference at both ends of the rock core under the injection of current oil-water ratio, the water phase under the injection of current oil-water ratio
Quality, current oil-water ratio of the viscosity, the rock core to be measured of water under oil-water ratio injection under the injection of current oil-water ratio
The density of the density of oil under injection, the water under the injection of current oil-water ratio.
5. according to the method described in claim 1, it is characterized in that, the parameter information of the rock core to be measured, including：
The pore volume of the length of the rock core to be measured, the sectional area of the rock core to be measured, the rock core to be measured.
6. a kind of permeability saturation curve test device, which is characterized in that described device is applied to rock core to be measured, the rock to be measured
Isolating device is provided with outside the heart, the isolating device includes：First separation layer, the second separation layer, first end cover, second end
Lid, the first filter device, the second filter device, the first conduit, the second conduit, the first end cover is provided with to be led with described first
The first through hole of tube shape adaptation, the second end cover are provided with the second through-hole being adapted to second catheter shape；
The first separation layer cladding rock core to be measured forms first shell, and the first end cover is filled by first filtering
The first end for being covered in the first shell is set, the second end cover is covered in the first shell by second filter device
The second end of body, second separation layer is covered with the first shell of the first end cover and the second end cover, described
First conduit is threaded through in the first through hole, and for injecting fluid to the rock core to be measured, second conduit is threaded through institute
It states in the second through-hole, the fluid for the rock core outflow to be measured to be discharged；
Described device includes：
First acquisition module, the irreducible water saturation for obtaining the rock core to be measured；
Second acquisition module, for obtaining oil phase effective permeability of the rock core to be measured under irreducible water saturation；
Third acquisition module, for obtaining test data of the rock core to be measured under the injection of each oil-water ratio；
Computing module is used for the parameter information according to the rock core to be measured, the rock core to be measured under the injection of each oil-water ratio
Oil phase effective permeability under irreducible water saturation of test data, the rock core to be measured, determine the rock core to be measured every
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under the kind oil-water ratio injection；
Drafting module, according to the irreducible water saturation of the rock core to be measured, and, the rock core to be measured is in each oil-water ratio
Relative permeability, the relative permeability of water phase, the water saturation of oil phase under example injection, draw the grease of the rock core to be measured
Permeability saturation curve.
7. device according to claim 6, which is characterized in that the length of the rock core to be measured is greater than or equal to default length
Degree.
8. device according to claim 7, which is characterized in that the preset length is 30 centimetres.
9. device according to claim 6, which is characterized in that the test data includes：
It is the regime flow of the lower oil phase of current oil-water ratio injection, the oily viscosity under the injection of current oil-water ratio, described to be measured
The regime flow, current of the pressure difference at both ends of the rock core under the injection of current oil-water ratio, the water phase under the injection of current oil-water ratio
Quality, current oil-water ratio of the viscosity, the rock core to be measured of water under oil-water ratio injection under the injection of current oil-water ratio
The density of the density of oil under injection, the water under the injection of current oil-water ratio.
10. device according to claim 6, which is characterized in that the parameter information of the rock core to be measured, including：
The pore volume of the length of the rock core to be measured, the sectional area of the rock core to be measured, the rock core to be measured.
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| CN110243714A (en) * | 2019-06-17 | 2019-09-17 | 中国石油大学(北京) | The method for measuring polymer water aerodynamic size |
| CN111781051A (en) * | 2020-07-09 | 2020-10-16 | 中国石油大学(北京) | Artificial conglomerate core based on lithology and permeability control and preparation method and application thereof |
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