CN106814018A - A kind of tight rock gas phase relative permeability measurement apparatus and method - Google Patents
A kind of tight rock gas phase relative permeability measurement apparatus and method Download PDFInfo
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- 239000011435 rock Substances 0.000 title claims abstract description 84
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 62
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- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
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- 238000002474 experimental method Methods 0.000 claims description 7
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- 239000011148 porous material Substances 0.000 claims description 6
- 230000006641 stabilisation Effects 0.000 claims description 6
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- 238000006073 displacement reaction Methods 0.000 claims description 5
- 238000013461 design Methods 0.000 claims description 3
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- 238000005481 NMR spectroscopy Methods 0.000 description 9
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- 239000012530 fluid Substances 0.000 description 4
- 239000000243 solution Substances 0.000 description 4
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- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
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- 238000009738 saturating Methods 0.000 description 2
- 230000009182 swimming Effects 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 210000001367 artery Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
- 210000004209 hair Anatomy 0.000 description 1
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- 230000008595 infiltration Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
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- 238000009533 lab test Methods 0.000 description 1
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- 239000003345 natural gas Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
- 230000005514 two-phase flow Effects 0.000 description 1
- 210000003462 vein Anatomy 0.000 description 1
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- 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
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N15/082—Investigating permeability by forcing a fluid through a sample
- G01N15/0826—Investigating permeability by forcing a fluid through a sample and measuring fluid flow rate, i.e. permeation rate or pressure change
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Abstract
The invention discloses a kind of tight rock gas phase relative permeability measurement apparatus, it includes：Core holding unit, confined pressure pump, variable-volume upstream pressure room, variable-volume downstream pressure room, high-pressure air source, console and NMR；The gas outlet of the high-pressure air source passes sequentially through valve a, first pressure controller and valve b and is connected with the import of variable-volume upstream pressure room, and the outlet of variable-volume upstream pressure room is connected by valve c with core holding unit；Core holding unit is connected by valve d with the import of variable-volume downstream pressure room, and the outlet of variable-volume downstream pressure room is connected by valve f with pressure relief opening；Core holding unit is arranged on inside the measurement chamber of NMR.The present invention provides a set of measuring method based on this measurement apparatus simultaneously.The present invention has the beneficial effect of the gas relative permeability that can quickly and efficiently measure tight rock.
Description
Technical field
The present invention relates to a kind of tight rock gas phase relative permeability measurement apparatus and measuring method, belong to gas phase to oozing
Saturating rate fields of measurement.
Background technology
The natural gas resources of hypotonic compact reservoir occupy very big ratio in China's geological resource reserves.Accurate Determining
Calculating, dynamic analysis, numerical value of the physical property (such as gas phase relative permeability) of such reservoir rock to reservoir gas well yield
Simulation etc. is extremely important, but is difficult Accurate Determining tight rock gas water relative permeability at present.
The test of existing gas water relative permeability laboratory experiment is both referred to GB/T 28912-2012 (two phase flows in rock
Body phase is to permeability determination method), i.e., gas water relative permeability is determined with two methods of steady state method and cold store enclosure.Stable state
Method is that gas water is at the uniform velocity injected into rock sample in certain flow ratio, until rock sample imports and exports pressure at two ends and the gas water for passing through rock sample
Flow reaches stabilization, and the water saturation of rock sample is when also no longer changing, and effectively infiltration is directly calculated by Darcy formula
Rate and relative permeability；The method is adapted to the rock (easily reaching stabilization) of good penetrability, for tight rock due to stabilization
Time is oversize and invalid.
But, the measure of the gas water relative permeability of hypotonic tight rock is typically using in standard GB/T28912-2012
Cold store enclosure, be first to use water saturation test sample, with certain pressure or flow velocity injection gas displacement saturation water rock sample, note
Record displacement pressure, aquifer yield and gas production change with time relation, wherein paying special attention to observation and the note of water breakthrough time node
Record, and then calculate gas water relative permeability with J.B.N methods；Although the method shortens the testing time, improves test effect
Rate, however but have ignored capillary pressure influence (in compact reservoir capillarity very protrusion (refers to：capillary
Pressure and permeability relationships in tight gas sands [Wells etc., 1985]), and
Influence to gas water relative permeability is notable), the determination of water breakthrough time node in addition often exists delayed, and these all make to bring about the desired sensation/
Effective measure of water relative permeability can not be guaranteed.
The content of the invention
Regarding to the issue above and not enough, the technical problems to be solved by the invention are：How to provide a kind of in consideration hollow billet
Gas relative permeability can be quickly measured in the case of the effect of pressure, typical measuring arrangements and its measuring method can be reduced again
The gas phase relative permeability measurement apparatus of human error are easily caused due to complex steps.
The present invention provides a set of measuring method based on this measurement apparatus simultaneously.
In order to solve the above problems, present invention employs following technical scheme.
A kind of tight rock gas phase relative permeability measurement apparatus, it includes：Core holding unit, confined pressure pump, variable-volume
Upstream pressure room, variable-volume downstream pressure room, high-pressure air source, console and NMR；The core holding unit is built-in
Rock core is loaded with, core holding unit is provided with thermometer；
The gas outlet of the high-pressure air source passes sequentially through valve a, first pressure controller and valve b and variable-volume upstream
The import of balancing gate pit is connected, and the outlet of the variable-volume upstream pressure room passes through the front end phase of valve c and core holding unit
Connection；The rear end of core holding unit is connected by valve d with the import of variable-volume downstream pressure room, under the variable-volume
The outlet for swimming balancing gate pit is connected by valve f with pressure relief opening；The rear end of core holding unit is connected by valve e with discharge outlet
Connect；The gas outlet of confined pressure pump passes sequentially through valve g and second pressure controller is connected with the front end of core holding unit；
Valve h is provided between the import of the front end of the core holding unit and the variable-volume downstream pressure room；
Upstream pressure sensor P1 for monitoring variable-volume upstream pressure chamber pressure force value is electrically connected with console；For
The downstream pressure sensor P2 for monitoring variable-volume downstream pressure chamber pressure force value is electrically connected with console；The variable-volume upstream
Differential pressure pickup, the differential pressure pickup are provided between the outlet and the import of the variable-volume downstream pressure room of balancing gate pit
Electrically connected with console；The thermometer is electrically connected with console.
Further, the core holding unit is arranged on inside the measurement chamber of NMR.
A kind of tight rock gas phase relative permeability measuring method, it is comprised the following steps：
S1, the rock core of drying is put into core holding unit, opens valve g, apply the confined pressure of setting to rock core with confined pressure pump
Afterwards, the volume of variable-volume upstream pressure room and variable-volume downstream pressure room is adjusted to match with rock sample pore volume
Value, opens valve h, valve d, valve c, valve a and valve b, closes valve e and valve f, and pressure in system is applied into design
Value Pm, after after system stabilization, valve b, valve a, valve c and valve h are closed, stay open valve d；
S2, opening valve a and valve b, a pulse is applied to variable-volume upstream pressure room, when variable-volume upstream pressure
When power chamber pressure rises and reaches the pressure for setting, valve a and valve b is closed, treat that variable-volume upstream pressure chamber pressure is steady
Regularly, valve c is opened, until variable-volume upstream pressure chamber pressure and variable-volume downstream pressure chamber pressure tend towards stability
When, stop experiment；
Computer on S3, console collects variable-volume upstream pressure chamber pressure force value P by data collecting card1、
Variable-volume downstream pressure chamber pressure force value P2, upstream and downstream pressure differential △ P and temperature t, draw upstream and downstream pressure differential △ P and time
Relation curve, and calculate slope1；
Calculated according to formula 1：Before saturation water, internal pressure PmUnder absolute permeability kab：
Wherein, α1Dimension be s-1；μ is the viscosity of gas, dimension mPas；L is rock sample length, dimension cm；fzBe with
The related coefficient of nitrogen property, dimensionless；A is the sectional area of rock sample, dimension cm2；PmIt is pore pressure, dimension MPa；V1It is rock
The upstream water tank and pipeline of sample upstream, the cumulative volume of valve, dimension cm3；V2Be the water tank and pipeline in rock sample downstream, valve it is total
Volume, dimension cm3；kabIt is absolute permeability；
S4, from core holding unit will rock core take out and saturation water after rock core is put back in core holding unit again, open nuclear-magnetism
Resonance instrument checks that rock core includes the water saturation whether water volume reaches saturation requirement and real-time monitored rock core, close valve d,
Valve f and valve h, corresponding displacement pressure difference is chosen with reference to the rock core air water capillary pressure curve, opens valve valve e, valve
C, valve b and valve a, with nitrogen flooding for the water in rock core, when observing that water saturation reaches preset value from NMR
During β %, close valve e, open valve d, valve f and valve h, repeat step S1-S3, draw upstream and downstream pressure differential △ P and when
Between relation curve, and calculate slope2；
Calculated according to formula 2：When water saturation is β % in rock core, internal pressure PmUnder permeability kap：
Wherein, α2Dimension be s-1；kapIt is apparent permeability；
Gas relative permeability k is drawn according to formula 3r：
S5, continuation nitrogen flooding repeat S4, and can obtain difference according to formula 1, formula 2 and formula 3 for the water in rock core
Gas phase permeability under water saturation.
The present invention has the advantages that：(1) the stable flow velocity of flow in low permeability core is measured without devoting a tremendous amount of time；
(2) gas phase permeability under multiple saturation degrees can in a short time be obtained；(3) stability of real-time monitoring and decision-making system, and
Help adjusts testing scheme and test process, and the presence of system and human error is avoided as far as possible.(4) hollow billet is considered in measurement process
The effect of pressure so that effective measure of gas water relative permeability is guaranteed.
In sum, the present invention is with the beneficial of the gas relative permeability that can quickly and efficiently measure tight rock
Effect.
Brief description of the drawings
Fig. 1 is structural representation of the invention.
In figure, 1- valves a, 2- valve b, 3- valve c, 4- valve d, 5- valve e, 6- valve f, 7- valve g, 8- valve h,
9- confined pressure pumps, 10- pressure controllers 1,11- pressure controllers 2,12- differential pressure pickups, 13- upstream pressure sensors, under 14-
Trip pressure sensor, 15- thermometers, 16- discharge outlet, 17- pressure relief openings, 18- core holding units, 19- NMRs, 20- can
Variable volume upstream pressure room, 21- variable-volume downstream pressures room, 22- consoles, 23- high-pressure air sources.
Specific embodiment
As shown in Figure 1：The present invention is the device that a kind of cold store enclosure surveys gas relative permeability, and apparatus structure feature is such as
Under：It is main by core holding unit 18, confined pressure pump 9, variable-volume upstream pressure room 20, variable-volume downstream pressure room 21, height
Pressurized air source 23, console 22 and NMR 19 are constituted；
The present invention can be used to measure gas phase relative permeability and gas phase phase in gas water two phase fluid flow in oil/gas two phase fluid flow
To permeability, illustrated by gas phase relative permeability in gas water two phase fluid flow below.
The rock core for testing is mounted with core holding unit 18, core holding unit is provided with thermometer.On variable-volume
Trip balancing gate pit 20 and the equal adjustable volume size in variable-volume downstream pressure room 21, and the volume of variable-volume upstream pressure room 20
More than variable-volume downstream pressure room 21, because the combination of upstream and downstream volume is different, can make total time that pressure pulse is propagated and
The overall presure drop that can be produced is had any different, therefore uses adjustable balancing gate pit, according to the different volume ratio in upstream and downstream balancing gate pit, with reference to
Actual conditions can more accurately measure the gas permeability under this saturation degree.
The gas outlet of high-pressure air source 23 is connected by valve a1 with the entrance of first pressure controller 10, first pressure control
The outlet of device processed 10 is connected by valve b2 with the import of variable-volume upstream pressure room 20, variable-volume upstream pressure room 20
Outlet be connected with the front end of core holding unit 18 by valve c3, the rear end of core holding unit 18 by valve d4 with it is variable
The import of volume downstream pressure room 21 is connected, and the outlet of variable-volume downstream pressure room 21 passes through valve f6 and the phase of pressure relief opening 17
Connection；The rear end of core holding unit 18 is connected by valve e5 with discharge outlet 16；The gas outlet of confined pressure pump 9 passes sequentially through valve
G7 and second pressure controller 11 are connected with the front end of core holding unit 18；Under the front end of core holding unit 18 and variable-volume
Valve h8 is provided between the import for swimming balancing gate pit 21；Upstream pressure for monitoring variable-volume upstream pressure chamber pressure force value is passed
Sensor P113 is electrically connected with console 22；Downstream pressure sensor P214 for monitoring variable-volume downstream pressure chamber pressure force value
Electrically connected with console 22；The import of the outlet of variable-volume upstream pressure room 20 and the variable-volume downstream pressure room 21 it
Between be provided with differential pressure pickup 12, differential pressure pickup 12 is electrically connected with console 22；Thermometer 15 is electrically connected with console 22.
The present invention realizes measurement with pressure pulse method, and its measuring principle is as follows：Gas phase is determined to oozing with pressure pulse method
Saturating rate, first applies a certain amount of pulse to rock upstream, makes gas in rock interior one dimensional fluid flow, and upstream pressure reduces, downstream
Pressure increases, can with pressure differential to rock upstream and downstream and time relation curve and data.Based on Darcy's law and gas
The continuity equation of body, can obtain the numerical solution of the diffusion equation of gas；Transient state arteries and veins is explained with the numerical solution of diffusion equation
The experimental data that the method for punching is obtained, obtains the absolute permeability of the permeability of rock, i.e. rock.Rock will be put into after rock saturation water again
In heart clamp holder, nitrogen driven water-replacing is monitored with nuclear magnetic resonance device, now form the water saturation of β %, it is assumed that water is in an experiment
Will not move, a certain amount of pulse, the pressure differential of the rock upstream and downstream under available this water saturation and time are applied to upstream
Relation curve and data, and then the gas phase permeability of the permeability under this gas saturation, i.e. rock can be obtained, gas phase
It is as follows to computing permeability formula：
Wherein：α is the slope for being fitted pressure differential and time relationship respectively twice, dimension s-1.μ is the viscosity of gas, dimension
mPa·s.L is rock sample length, dimension cm.fzIt is the coefficient related to nitrogen property, dimensionless.A is the sectional area of rock sample, amount
Guiding principle cm2。pmIt is pore pressure, dimension mPa.V1It is upstream water tank and pipeline, the cumulative volume of valve of rock sample upstream, dimension cm3。V2
It is water tank and pipeline, the cumulative volume of valve in rock sample downstream, dimension cm3。kabIt is absolute permeability.kapIt is gas phase permeability.kr
It is gas relative permeability.
The foundation of water saturation：The air water capillary pressure curve of the rock sample is measured, different hairs are chosen according to this from small to large
Pipe pressure, each capillary pressure one water saturation β % of correspondence, gas phase under each saturation degree that just measurement is chosen in an experiment
Permeability.Each saturation degree one capillary pressure of correspondence, then the size of pulse is that the selection of △ P just has on one in an experiment
Limit, the pressure difference △ p and upper, variable-volume come in contrived experiment by the pressure chosen in the size and capillary pressure curve of porosity
The volume of downstream pressure room.
Core holding unit is placed in the instrument of nuclear magnetic resonance, state of the whole core holding unit all in hydrogen-free.
Cumulative volume V in determination upstream before test1With downstream cumulative volume V2。
The specific method that pressure pulse surveys gas relative permeability is divided into following steps：
S1, the rock core of drying is put into core holding unit, opens valve g7, applying setting to rock core with confined pressure pump 9 encloses
After pressure, by variable-volume upstream pressure room 20 and variable-volume downstream pressure room 21 be adjusted to most suitable volume size (namely
It is the value matched with rock sample pore volume), open valve h8, valve d4, valve c3, valve a1, valve b2, closing valve
E5, valve f6, design load P is applied to by pressure in systemm, after after system stabilization (about two hours), close valve b2, valve
A1, valve c3 and valve h8, stay open valve d4；
S2, opening valve a1 and valve b2, apply a pulse, when on variable-volume to variable-volume upstream pressure room 20
When trip pressure chamber pressure rises and reaches the pressure for setting, valve a1 and valve b2 is closed, treat variable-volume upstream pressure room
During pressure stability, valve c3 is opened, until variable-volume upstream pressure chamber pressure and variable-volume downstream pressure chamber pressure become
When stablizing, stop experiment；
Computer on S3, console collects variable-volume upstream pressure chamber pressure force value P by data collecting card1、
Variable-volume downstream pressure chamber pressure force value P2, upstream and downstream pressure differential △ P and temperature t, draw upstream and downstream pressure differential △ P and time
Relation curve, and calculate slope1；
Calculated according to formula 1：Before saturation water, internal pressure PmUnder absolute permeability kab：
Wherein, α1Dimension be s-1；μ is the viscosity of gas, dimension mPas；L is rock sample length, dimension cm；fzBe with
The related coefficient of nitrogen property, dimensionless；A is the sectional area of rock sample, dimension cm2；PmIt is pore pressure, dimension MPa；V1It is rock
The upstream water tank and pipeline of sample upstream, the cumulative volume of valve, dimension cm3；V2Be the water tank and pipeline in rock sample downstream, valve it is total
Volume, dimension cm3；kabIt is absolute permeability；
S4, from core holding unit by rock core take out and saturation water (with reference to GB/T 28912-2012) afterwards again put back to rock core press from both sides
In holder 18, open NMR 19 and check that rock core includes whether water volume reaches saturation requirement and real-time monitored rock core contains
Water saturation, closes valve d4, valve f6 and valve h8, and corresponding displacement pressure is chosen with reference to the rock core air water capillary pressure curve
Difference, opens valve e5, valve c3, valve b2 and valve a1, with nitrogen flooding for the water in rock core, when the observation from NMR
When reaching preset value β % to water saturation, valve e5 is closed, opens valve d4, valve f6 and valve h8, repeat step S1-S3,
The relation curve of upstream and downstream pressure differential △ P and time is drawn, and calculates slope2；
Calculated according to formula 2：When water saturation is β % in rock core, internal pressure PmUnder permeability kap：
Wherein, α2Dimension be s-1；kapIt is apparent permeability；
Gas relative permeability k is drawn according to formula 3r：
S5, continuation nitrogen flooding repeat S4, and can obtain difference according to formula 1, formula 2 and formula 3 for the water in rock core
Gas phase permeability under water saturation.
Finally illustrate, the above embodiments are merely illustrative of the technical solutions of the present invention and it is unrestricted, although with reference to compared with
Good embodiment has been described in detail to the present invention, it will be understood by those within the art that, can be to skill of the invention
Art scheme is modified or equivalent, and without deviating from the objective and scope of technical solution of the present invention, it all should cover at this
In the middle of the right of invention.
Claims (3)
1. a kind of tight rock gas phase relative permeability measurement apparatus, it is characterised in that including：Core holding unit (18), confined pressure
Pump (9), variable-volume upstream pressure room (20), variable-volume downstream pressure room (21), high-pressure air source (23) and console (22)；
Rock core is mounted with the core holding unit (18), core holding unit (18) is provided with thermometer (15)；
The gas outlet of the high-pressure air source (23) pass sequentially through valve a (1), first pressure controller (10) and valve b (2) with can
The import of variable volume upstream pressure room (20) is connected, and the outlet of the variable-volume upstream pressure room (20) passes through valve c (3)
Front end with core holding unit (18) is connected；Pressed with variable-volume downstream by valve d (4) rear end of core holding unit (18)
The import of power room (21) is connected, and the outlet of the variable-volume downstream pressure room (21) is by valve f (6) and pressure relief opening (17)
It is connected；The rear end of core holding unit (18) is connected by valve e (5) with discharge outlet (16)；The outlet of confined pressure pump (9) is successively
It is connected with the front end of core holding unit (18) by valve g (7) and second pressure controller (11)；
Valve h is provided between the front end of the core holding unit (18) and the import of the variable-volume downstream pressure room (21)
(8)；
Upstream pressure sensor P1 (13) for monitoring variable-volume upstream pressure chamber pressure force value is electrically connected with console (22)；
Downstream pressure sensor P2 (14) for monitoring variable-volume downstream pressure chamber pressure force value is electrically connected with console (22)；It is described
Pressure difference is provided between the outlet of variable-volume upstream pressure room (20) and the import of the variable-volume downstream pressure room (21)
Sensor (12), the differential pressure pickup (12) electrically connects with console (22)；The thermometer (15) and console (22) electricity
Connection.
2. gas phase relative permeability measurement apparatus in a kind of tight rock according to claim 1, it is characterised in that described
Core holding unit (18) is arranged on inside the measurement chamber of NMR (19).
3. a kind of tight rock gas phase relative permeability measuring method, it is characterised in that it is comprised the following steps：
S1, the rock core of drying is put into core holding unit, opens valve g (7), applying setting to rock core with confined pressure pump (9) encloses
After pressure, the volume of variable-volume upstream pressure room (20) and variable-volume downstream pressure room (21) is adjusted to and rock sample pore-body
The value that matches of product, opens valve h (8), valve d (4), valve c (3), valve a (1) and valve b (2), closing valve e (5) and
Valve f (6), design load P is applied to by pressure in systemm, after after system stabilization, close valve b (2), valve a (1), valve c
(3) and valve h (8), valve d (4) is stayed open；
S2, opening valve a (1) and valve b (2), a pulse is applied to variable-volume upstream pressure room (20), works as variable-volume
When upstream pressure chamber pressure rises and reaches the pressure for setting, valve a (1) and valve b (2) are closed, treat variable-volume upstream
During balancing gate pit's pressure stability, valve c (3) is opened, until variable-volume upstream pressure chamber pressure and variable-volume downstream pressure room
When pressure tends towards stability, stop experiment；
Computer on S3, console collects variable-volume upstream pressure chamber pressure force value P by data collecting card1, can variant
Product downstream pressure chamber pressure force value P2, upstream and downstream pressure differential △ P and temperature t, show that the relation of upstream and downstream pressure differential △ P and time is bent
Line, and calculate slope1；
Calculated according to formula 1：Before saturation water, internal pressure PmUnder absolute permeability kab：
Wherein, α1Dimension be s-1；μ is the viscosity of gas, dimension mPas；L is rock sample length, dimension cm；fzIt is and nitrogen
The coefficient of qualitative correlation, dimensionless；A is the sectional area of rock sample, dimension cm2；PmIt is pore pressure, dimension MPa；V1It is rock sample upstream
Upstream water tank and pipeline, the cumulative volume of valve, dimension cm3；V2It is water tank and pipeline, the cumulative volume of valve in rock sample downstream, amount
Guiding principle cm3；kabIt is absolute permeability；
S4, rock core is taken out and again puts back in core holding unit (18) rock core after saturation water from core holding unit, open nuclear-magnetism
Resonance instrument (19) checks that rock core includes the water saturation whether water volume reaches saturation requirement and real-time monitored rock core, shutoff valve
Door d (4), valve f (6) and valve h (8), corresponding displacement pressure difference is chosen with reference to the rock core air water capillary pressure curve, opens valve
Gate valve door e (5), valve c (3), valve b (2) and valve a (1), with nitrogen flooding for the water in rock core, when from NMR
It was observed that when water saturation reaches preset value β %, closing valve e (5), valve d (4), valve f (6) and valve h (8), weight are opened
Multiple step S1-S3, draws the relation curve of upstream and downstream pressure differential △ P and time, and calculate slope2；
Calculated according to formula 2：When water saturation is β % in rock core, internal pressure PmUnder permeability kap：
Wherein, α2Dimension be s-1；kapIt is apparent permeability；
Gas relative permeability k is drawn according to formula 3r：
S5, continuation nitrogen flooding repeat S4 for the water in rock core, and it is full to can obtain different water according to formula 1, formula 2 and formula 3
With the gas phase permeability under degree.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710039784.2A CN106814018B (en) | 2017-01-18 | 2017-01-18 | Device and method for measuring gas-phase relative permeability of tight rock |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710039784.2A CN106814018B (en) | 2017-01-18 | 2017-01-18 | Device and method for measuring gas-phase relative permeability of tight rock |
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| Publication Number | Publication Date |
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| CN106814018A true CN106814018A (en) | 2017-06-09 |
| CN106814018B CN106814018B (en) | 2023-04-28 |
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| CN (1) | CN106814018B (en) |
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| CN109916799B (en) * | 2019-03-22 | 2021-04-20 | 西南石油大学 | Experimental method for measuring unconventional dense gas reservoir spontaneous imbibition relative permeability |
| CN113825996A (en) * | 2019-05-17 | 2021-12-21 | 沙特阿拉伯石油公司 | Method and system for determining core permeability in pulse attenuation experiments |
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| CN110672487A (en) * | 2019-09-30 | 2020-01-10 | 苏州冠德能源科技有限公司 | Method for predicting absolute permeability of compact rock |
| CN110672487B (en) * | 2019-09-30 | 2022-05-24 | 苏州冠德能源科技有限公司 | Method for predicting absolute permeability of compact rock |
| CN110702586A (en) * | 2019-11-05 | 2020-01-17 | 清华大学 | Method and device for measuring permeability of rock core |
| CN111307685A (en) * | 2020-01-16 | 2020-06-19 | 中国石油大学(华东) | Device and method for testing displacement, steady state and transient permeability of low-permeability rock |
| CN111929223B (en) * | 2020-09-24 | 2022-11-18 | 山东科技大学 | Device and method for quickly and accurately measuring seepage rule of gas in compact rock core |
| CN111929223A (en) * | 2020-09-24 | 2020-11-13 | 山东科技大学 | Device and method for quickly and accurately measuring seepage rule of gas in compact rock core |
| CN112630118A (en) * | 2020-11-16 | 2021-04-09 | 苏州开洛泰克科学仪器科技有限公司 | Gas permeability measuring device and measuring method for compact material |
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