CN109387467A - The method for rapidly testing of the comprehensive starting pressure gradient of grease - Google Patents
The method for rapidly testing of the comprehensive starting pressure gradient of grease Download PDFInfo
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- CN109387467A CN109387467A CN201710665029.5A CN201710665029A CN109387467A CN 109387467 A CN109387467 A CN 109387467A CN 201710665029 A CN201710665029 A CN 201710665029A CN 109387467 A CN109387467 A CN 109387467A
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- 239000004519 grease Substances 0.000 title claims abstract description 111
- 238000012360 testing method Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title claims abstract description 32
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 140
- 239000012071 phase Substances 0.000 claims abstract description 125
- 239000011435 rock Substances 0.000 claims abstract description 116
- 238000002347 injection Methods 0.000 claims abstract description 110
- 239000007924 injection Substances 0.000 claims abstract description 110
- 230000035699 permeability Effects 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- 239000008346 aqueous phase Substances 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 7
- 239000012530 fluid Substances 0.000 claims description 8
- 238000005325 percolation Methods 0.000 claims description 7
- 238000005481 NMR spectroscopy Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000015572 biosynthetic process Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000003786 synthesis reaction Methods 0.000 description 2
- 238000010998 test method Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000009795 derivation Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000005311 nuclear magnetism Effects 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000009738 saturating Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000005303 weighing Methods 0.000 description 1
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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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- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L13/00—Devices or apparatus for measuring differences of two or more fluid pressure values
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- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
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Abstract
The present invention provides a kind of method for rapidly testing of comprehensive starting pressure gradient of grease, by being randomly provided one group of oil under the conditions of any grease injects velocity ratio, mutually injection flow velocity and water phase injection flow velocity carry out rock core displacement test to this method, when outlet end Oil phase flow rate and aqueous phase flow rate and outlet end grease velocity ratio no longer change, read injection end pressure, outlet pressures and outlet end water phase flow, and combine rock core length, perpendicular to the area of the rock core cross section of rock core length direction, rock core absolute permeability, aqueous viscosity and water phase relative permeability calculate the comprehensive starting pressure gradient of grease under the conditions of grease injection velocity ratio.One group of oil is arranged in this method, and mutually injection flow velocity and water phase injection flow velocity can be obtained the comprehensive starting pressure gradient of grease, effectively reduce experimental work amount under the premise of guaranteeing experimental precision, improve work efficiency.
Description
Technical field
The invention belongs to oil field development field more particularly to a kind of quick test sides of the comprehensive starting pressure gradient of grease
Method.
Background technique
There are starting pressure gradients to have become industry common recognition for low-permeability oil deposit.During waterflooding extraction, water-oil phase is handed over
Interaction causes starting pressure gradient more complicated, and oil is mutually and water phase has starting pressure gradient, and fluid flow influences greatly,
Starting pressure gradient becomes important input parameter during flow simulating.
Starting pressure gradient test is the important content of low-permeability oil deposit core analysis, but the starting under the conditions of water-oil phase
Monophasic fluid starting pressure gradient test thinking and method are still used for reference in barometric gradient test at present: being kept fixed grease injection and flowed
Under conditions of speed ratio, adjustment oil, water phase inject flow velocity, monitor rock core entrance end pressure, respectively obtain oily mutually injection flow velocity and
Water phase injects the relationship of flow velocity and pressure, obtains oily phase and water phase starting pressure gradient by regression curve, then total with nuclear-magnetism
The method of vibration obtains rock core water containing saturability, establishes oil phase and water phase starting pressure gradient pass corresponding with rock core water containing saturability
System.Grease velocity ratio is finally adjusted, above procedure is repeated, it is aqueous to obtain a series of oily phases, water phase starting pressure gradient and rock core
The relationship of saturation degree establishes oil phase and water phase starting pressure gradient-rock core water containing saturability relation curve.Fig. 1 show existing
Oily phase starting pressure gradient test curve in technology adjusts oil and mutually injects under conditions of being kept fixed grease injection velocity ratio
Flow velocity obtains a series of oily scatterplot data for mutually injecting flow velocity and barometric gradient, is fitted to obtain oily mutually injection flow velocity using scatterplot
With the regression curve of barometric gradient relationship, the extended line of straightway and the intersection point of barometric gradient reference axis are to consolidate on the curve
Oily phase starting pressure gradient under conditions of fixed grease injection velocity ratio, as shown in phantom in Figure 1.It can obtain in the same way
Obtain water phase starting pressure gradient.Respectively obtain the oily phase starting pressure gradient and water phase starting pressure under a certain rock core water containing saturability
After force gradient, then the grease under the rock core water containing saturability calculated by oily phase starting pressure gradient and water phase starting pressure gradient
Comprehensive starting pressure gradient.It follows that the oil under conditions of obtaining fixed grease injection velocity ratio in the prior art mutually opens
Dynamic pressure force gradient and water phase starting pressure gradient need the adjustment injection flow velocity under the conditions of fixation grease injects velocity ratio, to set
Setting multiple groups oil, mutually injection flow velocity and water phase injection flow velocity carry out multiple rock core displacement test, thus expend time.
Although conventional method can obtain individually oil phase and water phase starting pressure gradient, and calculate obtain grease therefrom
Comprehensive starting pressure gradient, but the testing time is too long, generally requires that test could be completed within one month or so.However actually exist
Individually oil phase or water phase starting pressure gradient are not needed during being calculated, as long as obtaining the comprehensive starting pressure of grease
Gradient.Therefore, it is very necessary to invent a kind of test method for capableing of the comprehensive starting pressure gradient of quick obtaining water-oil phase.
Summary of the invention
Mutually grease synthesis is calculated in turn and is opened with water phase starting pressure gradient to solve above-mentioned acquisition oil independent in the prior art
The long technical problem of experiment testing time needed for dynamic pressure force gradient, the present invention provide a kind of the fast of the comprehensive starting pressure gradient of grease
Fast test method, concrete scheme are as follows:
A kind of method for rapidly testing of the comprehensive starting pressure gradient of grease, any grease are set at random under the conditions of injecting velocity ratio
Setting one group of oil, mutually injection flow velocity and water phase injection flow velocity carry out rock core displacement test, when outlet end Oil phase flow rate and aqueous phase flow rate with
And outlet end grease velocity ratio reads injection end pressure, outlet pressures and outlet end water phase flow, and tie when no longer changing
Close rock core length, perpendicular to rock core length direction rock core cross section area, rock core absolute permeability, aqueous viscosity and water phase
Relative permeability calculates the comprehensive starting pressure gradient of grease under the conditions of grease injection velocity ratio.
Preferably, water phase phase percolation curve is obtained；
Obtain the rock core water containing saturability under the conditions of any grease injection velocity ratio, by the rock core water containing saturability and
Water phase phase percolation curve obtains water phase relative permeability.
Preferably, the rock core water containing saturability under the conditions of any grease injection velocity ratio is obtained using nuclear magnetic resonance.
Preferably, multiple greases injection velocity ratios are set, the grease injection velocity ratio include: pure oil injection velocity ratio and
Pure water injects velocity ratio.
Preferably, the grease injection velocity ratio includes: 10:0,9:1,8:2,7:3,6:4,5:5,4:6,3:7,2:8,1:
9 and 0:10, the pure oil injection velocity ratio is 10:0, and the pure water injection velocity ratio is 0:10.
Preferably, in the corresponding oil of inflection point of rock core water containing saturability and the relation curve of the comprehensive starting pressure gradient of grease
Water injection velocity ratio is nearby once again set up multiple grease injection velocity ratios.
Preferably, rock core is soaked in water, later removal of core, displacement is carried out to rock core using pure oil as displacing fluid,
Until outlet end is flowed out without water phase to establish rock core irreducible water.
Preferably, the calculation formula of the comprehensive starting pressure gradient of the grease are as follows:
In formula: λIt is comprehensiveFor the comprehensive starting pressure gradient of grease, pinTo inject end pressure, poutFor outlet pressures, L is rock core
Length, qwFor outlet end water phase flow, μwFor aqueous viscosity, K is rock core absolute permeability, and Krw is water phase relative permeability, and A is
Perpendicular to the area of the rock core cross section of rock core length direction.
Preferably, the oil mutually injection flow velocity and water phase injection flow velocity respectively by corresponding high-pressure pump independent control, with
Obtain different grease injection velocity ratios.
Preferably, it is mutually mixed into displacing fluid with water phase by oily using six-way valve and injects rock core.
With need constantly to adjust under the conditions of the injection velocity ratio of same grease in the prior art setting multiple groups oil mutually injection flow velocity and
Water phase injection flow velocity carries out rock core displacement test individually to obtain oily phase starting pressure gradient and water phase starting pressure gradient, and by
This calculates the comprehensive starting pressure gradient of grease and compares, and the present invention provides a kind of quick test side of comprehensive starting pressure gradient of grease
Method, by being randomly provided one group of oil under the conditions of any grease injects velocity ratio, mutually injection flow velocity and water phase inject flow velocity to this method
Rock core displacement test is carried out, when outlet end Oil phase flow rate and aqueous phase flow rate and the no longer variation of outlet end grease velocity ratio,
Injection end pressure, outlet pressures and outlet end water phase flow are read, and combines rock core length, perpendicular to rock core length direction
Area, rock core absolute permeability, aqueous viscosity and the water phase relative permeability of rock core cross section calculate grease injection velocity ratio
Under the conditions of the comprehensive starting pressure gradient of grease.This method does not need to obtain individually oily phase starting pressure gradient and water phase starting
Barometric gradient, only by being randomly provided one group of oil, mutually injection flow velocity and water phase injection flow velocity can be obtained the comprehensive starting pressure of grease
Gradient effectively reduces experimental work amount under the premise of guaranteeing experimental precision, improves work efficiency.
Detailed description of the invention
The invention will be described in more detail below based on embodiments and refering to the accompanying drawings.Wherein:
Fig. 1 is oily phase starting pressure gradient test curve in the prior art；
Fig. 2 is the method flow diagram of the embodiment of the present invention；
Fig. 3 is the comprehensive starting pressure gradient of grease of the embodiment of the present invention with the variation of rock core water containing saturability；
Fig. 4 is that the device of the embodiment of the present invention connects schematic diagram.
In the accompanying drawings, identical component uses identical appended drawing reference, and attached drawing is not drawn to scale.
Specific embodiment
The present invention will be further explained below with reference to the accompanying drawings.
The oil that grease injection velocity ratio is each meant in the present embodiment mutually injects flow velocity: water phase injects flow velocity.
The present embodiment provides a kind of method for rapidly testing of the comprehensive starting pressure gradient of grease, this method passes through in any oil
It is randomly provided one group of oily mutually injection flow velocity under the conditions of water injection velocity ratio and water phase injection flow velocity carries out rock core displacement test, when out
When mouth end Oil phase flow rate and aqueous phase flow rate and outlet end grease velocity ratio no longer change, injection end pressure, outlet end are read
Pressure and outlet end water phase flow, and combine rock core length, perpendicular to rock core length direction rock core cross section area, rock core
Absolute permeability, aqueous viscosity and water phase relative permeability calculate the comprehensive starting pressure of grease under the conditions of grease injection velocity ratio
Force gradient.This method does not need to obtain individually oily phase starting pressure gradient and water phase starting pressure gradient, only by setting at random
Setting one group of oil, mutually injection flow velocity and water phase injection flow velocity can be obtained the comprehensive starting pressure gradient of grease, guarantee experimental precision
Under the premise of effectively reduce experimental work amount, improve work efficiency.
By taking certain oil field as an example, permeability 4.5mD, viscosity of crude 1.49mPa.s, aqueous viscosity 0.3mPa.s,
Rock core length is 5cm, cross-sectional diameter 2.5cm, and by test discovery, rock core displacement test is oily to outlet end since every time
The time that phase flow velocity and aqueous phase flow rate and outlet end grease velocity ratio no longer change is 5h.If 10 grease injections of setting
Velocity ratio, corresponding 10 groups of oil mutually injects flow velocitys and water phase injection flow velocity under the conditions of each grease injects velocity ratio, then using normal
The comprehensive starting pressure gradient of rule method test grease needs the time to reach 500 hours, that is to say, that each grease in conventional method
10 groups of oil under the conditions of injection velocity ratio mutually inject in flow velocity by injection flow velocitys and water phase, and each group requires once to be tested,
The oily phase starting pressure gradient and water phase starting pressure gradient under the conditions of grease injection velocity ratio could be obtained, and then calculates oil
Water integrates starting pressure gradient.And in the present embodiment, it is only necessary to corresponding 10 groups of oil phases under the conditions of each grease injection velocity ratio
Injection flow velocity and water phase injection flow velocity in randomly select one group carry out experiment can be obtained the grease injection velocity ratio under the conditions of
Grease integrates starting pressure gradient, so the rock core displacement test under the conditions of 10 greases injection velocity ratios of the present embodiment completion is only
50 hours are only needed, is greatly improved work efficiency.
Fig. 2 shows the method flow diagrams of the present embodiment, it is preferred that measures and obtain core parameters, the length including rock core
Spend L, the area A of the rock core cross section vertical with rock core length direction, rock core absolute permeability K, aqueous viscosity μwAnd water phase
Phase percolation curve Krw-Sw, the water phase relative permeability that wherein Krw refers to, SwThe rock core water containing saturability referred to, the parameter or curve
It is that those skilled in the art are i.e. retrievable by conventional technical means.The rock core for being used to test is soaked in water, Zhi Houqu
Rock core out carries out displacement to rock core using pure oil as displacing fluid, until outlet end is flowed out without water phase to establish rock core irreducible water.It builds
The purpose of vertical rock core irreducible water is to simulate the reset condition of renwing stratum.Multiple grease injection velocity ratios are set, will be had been established
The rock core of irreducible water is placed in core holding unit, chooses any grease injection velocity ratio, and any grease injects velocity ratio condition
Under be only randomly provided one group of oil mutually injection flow velocity and water phase injection flow velocity carry out rock core displacement test, when outlet end Oil phase flow rate and
When aqueous phase flow rate and outlet end grease velocity ratio no longer change, the injection end pressure p of rock core is readin, outlet pressures pout
And outlet end water phase flow qw.Velocity ratio is injected with grease, that is to say oily mutually injection flow velocity: for water phase injection flow velocity is 8:2,
Being randomly provided oily mutually injection flow velocity is constant M, then water phase injection flow velocity is M/4, injects flow velocity with oily mutually injection flow velocity M and water phase
M/4 carries out rock core displacement test, when outlet end Oil phase flow rate and aqueous phase flow rate and outlet end grease velocity ratio are (i.e. oily mutually to flow
Speed: aqueous phase flow rate) no longer change when, read the injection end pressure p of rock corein, outlet pressures poutAnd outlet end water phase flow
qw.After the completion of displacement test, rock core is taken out from core holding unit, carry out nuclear magnetic resonance test, obtains rock core containing water saturation
Degree.The water phase phase percolation curve of above-mentioned acquisition has given expression to rock core water containing saturability SwCorresponding with water phase relative permeability Krw is closed
System, according to the water phase phase percolation curve Krw-S of rock core water containing saturability and above-mentioned acquisitionwWater phase relative permeability Krw can be obtained.
After obtaining relevant parameter through the above steps, the grease that is calculated by the following formula under the conditions of selected any grease injection velocity ratio
Comprehensive starting pressure gradient:
In formula (1): λIt is comprehensiveFor the comprehensive starting pressure gradient of grease, pinTo inject end pressure, poutFor outlet pressures, L is
Rock core length, qwFor outlet end water phase flow, μwFor aqueous viscosity, K is rock core absolute permeability, and Krw, which is that water phase is opposite, to permeate
Rate, A are the area perpendicular to the rock core cross section of rock core length direction.
By formula (1) it is found that selected any grease injects the comprehensive starting pressure gradient λ of grease under the conditions of velocity ratioIt is comprehensive
It is unrelated with oily mutually injection flow velocity or water phase injection flow velocity, thus under the conditions of selected any grease injects velocity ratio by with
One group of oil is arranged in machine, and mutually injection flow velocity and water phase injection flow velocity carry out rock core displacement test and obtain injection end pressure pin, export side pressure
Power poutAnd outlet end water phase flow qw, in conjunction with rock core length L, aqueous viscosity μw, rock core absolute permeability K, water phase is opposite seeps
The saturating rate Krw and area A of the rock core cross section perpendicular to rock core length direction, and institute can be calculated using formula (1)
Select for a post the comprehensive starting pressure gradient λ of grease under the conditions of grease injection velocity ratioIt is comprehensive。
The specific derivation process of formula (1) is as follows:
Mutually have for oil:
In formula (2), qoFor outlet end oil phase flow rate；Variable K and A and formula (1) are same；Kro is oil relative permeability；μoFor
Oil phase viscosity；For barometric gradient differential；Dp is the Pressure differential of rock core length direction；Dx is rock core length differential；λoFor oil
Phase starting pressure gradient.
Have for water phase:
In formula (3), qwFor outlet end water phase flow；Variable K and A and formula (1) are same；Krw is water phase relative permeability；μwFor
Aqueous viscosity；For barometric gradient differential；Dp is the Pressure differential of rock core length direction；Dx is rock core length differential；λwFor water
Phase starting pressure gradient.
Due to:
Q (t)=qo+qw (4)
In formula (4), q (t) is outlet end total flow.
Formula (2) and formula (3) are substituted into formula (4), available:
To the integration variable x in formula (5) rock core length of interval [0, L] upper integral, it is available:
It enables:
And:
In formula (8), fwFor outlet end moisture content, i.e.,
Formula (7) and formula (8) are substituted into formula (6), obtained after transformation:
The comprehensive starting pressure under the conditions of preset each grease injects velocity ratio can be calculated by the above method
Gradient, different greases have corresponded to different rock core water containing saturabilities under the conditions of injecting velocity ratio, it is aqueous finally just to obtain rock core
Relation curve between saturation degree and the comprehensive starting pressure gradient of grease.
Preferably, pure oil injection velocity ratio, pure is included at least in the preset multiple greases injection velocity ratios of above-described embodiment
Water injects velocity ratio, the rock core under the conditions of rock core water containing saturability and pure water injection velocity ratio under the conditions of pure oil injection velocity ratio
Water saturation is two end values of rock core water containing saturability, and the water saturation under the conditions of remaining grease injection velocity ratio is with oil
Water injects the difference of velocity ratio and different, but is respectively positioned between two end values of above-mentioned rock core water containing saturability.It is preset multiple
Grease inject velocity ratio in include at least it is pure oil injection velocity ratio, pure water inject velocity ratio, ensure that rock core water containing saturability and
The integrality of relation curve between the comprehensive starting pressure gradient of grease.Grease injection velocity ratio can be even variation, example
Such as, preset multiple grease injection velocity ratios include: 10:0,9:1,8:2,7:3,6:4,5:5,4:6,3:7,2:8,1:9 and 0:
10, wherein pure oil injection velocity ratio is 10:0, it is 0:10 that pure water, which injects velocity ratio, in preset multiple grease injection velocity ratios,
Oily mutually injection flow velocity and water phase injection flow velocity all even variations, aqueous phase flow rate accounting while uniformly successively decreasing such as Oil phase flow rate accounting
Uniform increments, thus can more truly from pure oil to be injected into the corresponding different rock cores of pure water injection aqueous full for reflection comprehensively
It is less to avoid grease injection velocity ratio data setting in a certain range for relationship between degree and the comprehensive starting pressure gradient of grease
And the relationship caused between rock core water containing saturability and the comprehensive starting pressure gradient of grease is distorted.To preset multiple grease injection streams
Speed ratio 10:0,9:1,8:2,7:3,6:4,5:5,4:6,3:7,2:8,1:9 and 0:10 carry out what rock core displacement test obtained respectively
Experimental data is as shown in table 1.
Influence experimental result of 1 rock core water containing saturability of table to the comprehensive starting pressure gradient of grease
The undesirable experimental data of experimental result is eliminated in table 1.
The relation curve of the comprehensive starting pressure gradient of the rock core water containing saturability and grease drawn according to experimental result data
As shown in Figure 3.
In above-described embodiment, preset multiple grease injection velocity ratios can also further be refined, as shown in figure 3,
Grease note corresponding to the inflection point A1, A2 of the relation curve of the comprehensive starting pressure gradient of the rock core water containing saturability and grease of acquisition
Enter velocity ratio and be nearby once again set up multiple grease injection velocity ratios, and obtain the comprehensive starting pressure gradient of corresponding grease, with right
Rock core water containing saturability and the relation curve further progress local fine of the comprehensive starting pressure gradient of grease are portrayed at inflection point, are made
The relation curve of the comprehensive starting pressure gradient of obtained rock core water containing saturability and grease is closer to actual conditions.
It is illustrated in figure 4 the experimental provision connection schematic diagram of the present embodiment, which is used for rock core displacement test part, utilizes
Computer controls two independent high-pressure pumps and adjusts separately oily mutually injection flow velocity and water phase injection flow velocity to form different greases
Velocity ratio is injected, and is mutually mixed into displacing fluid with water phase by oily by six-way valve and injects rock core, while ring pressure control device controls
Ring pressure in core holding unit to complete to test, wherein metering device for measure when outlet end Oil phase flow rate and aqueous phase flow rate with
And outlet end grease velocity ratio no longer change when rock core injection end pressure pin, outlet pressures poutAnd outlet end water
Phase flow rate qwDeng parameter needed for calculating, weighing device is used to measure the gross weight of rock core, and nuclear magnetic resonance equipment passes through nuclear magnetic resonance and surveys
Measure the water saturation of rock core.Each parameter of gained uploads to computer and calculating is further processed to obtain grease synthesis
Starting pressure gradient, and draw the relation curve of rock core water containing saturability and the comprehensive starting pressure gradient of grease.
Although by reference to preferred embodiment, invention has been described, the case where not departing from the scope of the present invention
Under, it can be carried out it is various improvement and can be with equivalent substitution of some or all of the technical features.Especially,
As long as logic or structural conflict is not present, items technical characteristic mentioned in the various embodiments can combine in any way
Come.The invention is not limited to specific embodiments disclosed herein, but all skills including falling within the scope of the appended claims
Art scheme.
Claims (10)
1. a kind of method for rapidly testing of the comprehensive starting pressure gradient of grease, which is characterized in that any grease injects velocity ratio item
One group of oil is randomly provided under part, and mutually injection flow velocity and water phase injection flow velocity carry out rock core displacement test, when outlet end Oil phase flow rate and
When aqueous phase flow rate and outlet end grease velocity ratio no longer change, injection end pressure, outlet pressures and outlet end water are read
Phase flow rate, and combine rock core length, the area of rock core cross section perpendicular to rock core length direction, rock core absolute permeability, water
Phase viscosity and water phase relative permeability calculate the comprehensive starting pressure gradient of grease under the conditions of grease injection velocity ratio.
2. the method according to claim 1, wherein obtaining water phase phase percolation curve；
The rock core water containing saturability under the conditions of any grease injection velocity ratio is obtained, the rock core water containing saturability and water phase are passed through
Phase percolation curve obtains water phase relative permeability.
3. according to the method described in claim 2, it is characterized in that, obtaining any grease using nuclear magnetic resonance injects velocity ratio item
Rock core water containing saturability under part.
4. the grease injects the method according to claim 1, wherein multiple grease injection velocity ratios are arranged
Velocity ratio includes: pure oil injection velocity ratio and pure water injection velocity ratio.
5. according to the method described in claim 4, it is characterized in that, the grease injection velocity ratio include: 10:0,9:1,8:2,
7:3,6:4,5:5,4:6,3:7,2:8,1:9 and 0:10, the pure oil injection velocity ratio is 10:0, and the pure water injects velocity ratio
For 0:10.
6. according to the method described in claim 5, it is characterized in that, in rock core water containing saturability and the comprehensive starting pressure ladder of grease
The corresponding grease injection velocity ratio of the inflection point of the relation curve of degree is nearby once again set up multiple grease injection velocity ratios.
7. the method according to claim 1, wherein rock core is soaked in water, removal of core later, with pure oil
Displacement is carried out to rock core as displacing fluid, until outlet end is flowed out without water phase to establish rock core irreducible water.
8. the method according to claim 1, wherein the calculation formula of the comprehensive starting pressure gradient of the grease
Are as follows:
In formula: λIt is comprehensiveFor the comprehensive starting pressure gradient of grease, pinTo inject end pressure, poutFor outlet pressures, L is that rock core is long
Degree, qwFor outlet end water phase flow, μwFor aqueous viscosity, K is rock core absolute permeability, and Krw is water phase relative permeability, and A is vertical
Directly in the area of the rock core cross section of rock core length direction.
9. the method according to claim 1, wherein mutually injection flow velocity and water phase injection flow velocity lead to the oil respectively
Corresponding high-pressure pump independent control is crossed, injects velocity ratio to obtain different greases.
10. the method according to claim 1, wherein being mutually mixed into displacing fluid with water phase for oily using six-way valve
Inject rock core.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110160932A (en) * | 2019-06-03 | 2019-08-23 | 西南石油大学 | A kind of oil-water relative permeability curve test device and test method |
| CN117607005A (en) * | 2024-01-23 | 2024-02-27 | 中国石油大学(华东) | Method for measuring rock starting pressure gradient |
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