CN110286067A - A kind of method of Equivalent boundary layer thickness in quantitatively characterizing porous media - Google Patents
A kind of method of Equivalent boundary layer thickness in quantitatively characterizing porous media Download PDFInfo
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- 239000011148 porous material Substances 0.000 claims abstract description 158
- 230000035699 permeability Effects 0.000 claims abstract description 147
- 238000004364 calculation method Methods 0.000 claims abstract description 12
- 239000011435 rock Substances 0.000 claims description 28
- 239000012530 fluid Substances 0.000 claims description 20
- 238000005259 measurement Methods 0.000 claims description 18
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- 210000000867 larynx Anatomy 0.000 claims 1
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- 238000005516 engineering process Methods 0.000 description 3
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- 238000005325 percolation 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
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Abstract
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps: step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and porosity calculation theory pore throat radius and flowing pore throat radius, wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream move pore throat radius, water boundary layer thickness and oily boundary layer thickness are calculated by theoretical pore throat radius and flowing pore throat radius, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by theoretical pore throat radius and flowing pore throat radius；Step 3) judges influence of the porous media inner boundary layer to be measured to seepage flow according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness.
Description
Technical field
The invention belongs to reservoir physics core analysis technical fields, and in particular to equivalent in a kind of quantitatively characterizing porous media
The method of boundary layer thickness.
Background technique
The pore radius for being mainly characterized by fluid flowing of low-permeability oil deposit is small, and flow resistance is big, solid liquid interface and liquid liquid
Interaction between interface is affected to seepage flow, causes its percolation law to deviate classical Darcy linear seepage flow, belongs to non-
Darcy flow.The feature of non linear fluid flow through porous medium is mainly characterized with starting pressure gradient at present, but to causing starting pressure gradient
The reason of --- boundary layer research is less.Boundary layer is intermolecular in interface interaction and boundary layer due to solid and liquid
Interaction, blowhole inner surface there are a motionless layer, boundary layer thickness is bigger, more unfavorable to the flowing of fluid.
For high permeable cement, the thickness in boundary layer is smaller compared with pore throat radius, and the influence to seepage flow is little；But for low
For infiltration, extra-low permeability oil reservoirs, boundary layer thickness be can not ignore.
Boundary layer quantitative measuring method includes micro- round tube method and check weighing method at present.Wherein, micro- round tube test usually utilizes one
The annular microchamber of a known internal diameter carries out flowing experiment, according to the practical radius flowed of poiseuille theoretical calculation fluid, with true
The difference of internal diameter and flow radius calculates boundary layer thickness, but since rock porous media is not isodiametric round tube, but one
The various sizes of pore throat composition of series, so, this method is not suitable with the measurement of porous media inner boundary layer thickness.Weight method is pair
Weight than rock core before and after water drive is calculated, and not only error is big for this method, and due to the remaining oil type multiplicity after water drive, and
The non-inner surface for being present in porous media in the form of single oil film causes method to lack certain science, while this method
It cannot achieve the boundary layer quantitatively characterizing of different fluid.
Summary of the invention
It is an object of the invention to overcome above-mentioned the deficiencies in the prior art, provide equivalent in a kind of quantitatively characterizing porous media
The method of boundary layer thickness overcomes in the prior art 1: micro- round tube test is usually opened using the annular microchamber of a known internal diameter
Flowing experiment is opened up, according to the practical radius flowed of poiseuille theoretical calculation fluid, in terms of the difference of true internal diameter and flow radius
Boundary layer thickness is calculated, but since rock porous media is not isodiametric round tube, but a series of various sizes of pore throat compositions,
So this method is not suitable with the measurement of porous media inner boundary layer thickness；2: weight method is the weight of rock core before and after comparing water drive
It is calculated, not only error is big for this method, and due to the remaining oil type multiplicity after water drive, is not deposited in the form of single oil film
It is the inner surface of porous media, causes method to lack certain science, while this method cannot achieve the side of different fluid
Interlayer quantitatively characterizing；3: being unable to characterize porous media inner boundary layer thickness and different types of fluid in the prior art in porous Jie
The characterization of boundary layer thickness in matter, at the same the prior art measurement porous media in Equivalent boundary layer thickness efficiency it is lower, accidentally
The problems such as difference is larger.
In order to solve technical problem, the technical scheme is that Equivalent Boundary thickness in a kind of quantitatively characterizing porous media
The method of degree, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Preferably, theoretical pore throat radius is calculated by gas permeability in the step 2), wherein flowing pore throat radius
Permeability is surveyed by water or oil is surveyed computing permeability and obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius
With the difference of flowing pore throat radius, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness
Or the ratio of oily boundary layer thickness and theoretical pore throat radius.
Preferably, theoretical pore throat radius, flowing pore throat radius, water boundary layer thickness and oily boundary thickness in the step 2)
The calculation formula of degree are as follows:
Theoretical pore throat radius isFlowing pore throat radius isOr
Wherein:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
hw- water boundary layer thickness, um；
Ho-oil boundary layer thickness, um；
φ-porous media porosity, %.
Preferably, in the step 2) zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness calculation formula
Are as follows:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
φ-porous media porosity, %；
εwThe reasonable ratio by pore throat radius of-zero dimension water boundary layer thickness, i.e. water boundary layer thickness, %；
ε0- zero dimension oil boundary layer thickness, the i.e. reasonable ratio by pore throat radius of oily boundary layer thickness, %.
Preferably, when zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are less than 30% in the step 3)
When, porous media inner boundary layer to be measured is rudimentary to the influence degree of seepage flow；When zero dimension water boundary layer thickness or zero dimension oil
Boundary layer thickness be 30%~60% when, porous media inner boundary layer to be measured to the influence degree of seepage flow be in it is rudimentary；When it is no because
When secondary water boundary layer thickness or zero dimension oil boundary layer thickness are 60%~80%, porous media inner boundary layer to be measured is to seepage flow
Influence degree is middle-and-high-ranking；It is to be measured porous when zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are greater than 80%
Medium inner boundary layer is advanced to the influence degree of seepage flow.
Compared with the existing technology, the present invention has the advantages that
(1) present invention is to propose a kind of survey with rock core porous media gas on the basis of analyzing Liquid Flow difference and seep
The difference that the theoretical pore throat radius that saturating rate calculates surveys the flowing pore throat radius that permeability (water phase and oily phase) calculates with liquid quantifies table
The method for levying Equivalent boundary layer thickness in rock core porous media, and according to boundary layer thickness accounting size (the i.e. zero dimension of calculating
Water boundary layer thickness or zero dimension oil boundary layer thickness) boundary layer quickly judges seepage effect degree, work as zero dimension
When water boundary layer thickness or zero dimension oil boundary layer thickness are less than 30%, influence journey of the porous media inner boundary layer to be measured to seepage flow
Degree is rudimentary；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are 30%~60%, porous media to be measured
Inner boundary layer to the influence degree of seepage flow be in it is rudimentary；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are
When 60%~80%, porous media inner boundary layer to be measured is middle-and-high-ranking to the influence degree of seepage flow；When zero dimension water boundaries thickness
When degree or zero dimension oil boundary layer thickness are greater than 80%, porous media inner boundary layer to be measured is advanced to the influence degree of seepage flow；
(2) present invention can Equivalent boundary layer thickness and its accounting in quantitatively characterizing porous media, while can also quantitatively characterizing
The boundary layer thickness and its accounting of different types of fluid can be used for evaluating different permeabilities, different physical property fluids, different wetting
With the Equivalent boundary layer thickness under different pressures；
(3) for the present invention due to the Basic Physical Properties parameter that calculating parameter is rock core porous media, calculating process is simple, can be pair
Difference than studying different type flow through oil reservoir rule provides foundation, while being easy to carry out boundary layer to the fast of seepage effect degree
Speed judgement, and judge that accurately efficiency is higher, and error is smaller.
Specific embodiment
The specific embodiment of the invention is described below with reference to embodiment:
It should be noted that structure, ratio, the size etc. of this specification signal, only to cooperate disclosed in specification
Content, for those skilled in the art understand and read, be not intended to limit the invention enforceable qualifications, it is any
The modification of structure, the change of proportionate relationship or the adjustment of size are not influencing the effect of present invention can be generated and can reach
Purpose under, should all still fall in the range of disclosed technology contents can cover.
Meanwhile cited such as "upper" in this specification, "lower", "left", "right", " centre " and " one " term, also
Only being illustrated convenient for narration, rather than to limit the scope of the invention, relativeness is altered or modified, in nothing
Under essence change technology contents, when being also considered as the enforceable scope of the present invention.
" two-phase fluid is opposite in rock permeates by SY/T5336 " core analysis method " of the present invention, SY/T5345-2007
Rate test method " it is the prior art.
Embodiment 1
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Embodiment 2
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Embodiment 3
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Preferably, theoretical pore throat radius is calculated by gas permeability in the step 2), wherein flowing pore throat radius
Permeability is surveyed by water or oil is surveyed computing permeability and obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius
With the difference of flowing pore throat radius, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness
Or the ratio of oily boundary layer thickness and theoretical pore throat radius.
Embodiment 4
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Preferably, theoretical pore throat radius is calculated by gas permeability in the step 2), wherein flowing pore throat radius
Permeability is surveyed by water or oil is surveyed computing permeability and obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius
With the difference of flowing pore throat radius, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness
Or the ratio of oily boundary layer thickness and theoretical pore throat radius.
Preferably, theoretical pore throat radius, flowing pore throat radius, water boundary layer thickness and oily boundary thickness in the step 2)
The calculation formula of degree are as follows:
Theoretical pore throat radius isFlowing pore throat radius isOr
Wherein:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
hw- water boundary layer thickness, um；
ho- oil boundary layer thickness, um；
φ-porous media porosity, %.
Embodiment 5
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Preferably, theoretical pore throat radius is calculated by gas permeability in the step 2), wherein flowing pore throat radius
Permeability is surveyed by water or oil is surveyed computing permeability and obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius
With the difference of flowing pore throat radius, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness
Or the ratio of oily boundary layer thickness and theoretical pore throat radius.
Preferably, theoretical pore throat radius, flowing pore throat radius, water boundary layer thickness and oily boundary thickness in the step 2)
The calculation formula of degree are as follows:
Theoretical pore throat radius isFlowing pore throat radius isOr
Wherein:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
hw- water boundary layer thickness, um；
ho- oil boundary layer thickness, um；
φ-porous media porosity, %.
Preferably, in the step 2) zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness calculation formula
Are as follows:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
φ-porous media porosity, %；
εwThe reasonable ratio by pore throat radius of-zero dimension water boundary layer thickness, i.e. water boundary layer thickness, %；
ε0- zero dimension oil boundary layer thickness, the i.e. reasonable ratio by pore throat radius of oily boundary layer thickness, %.
Embodiment 6
The invention discloses a kind of methods of Equivalent boundary layer thickness in quantitatively characterizing porous media, comprising the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and hole
Porosity calculates theoretical pore throat radius and flowing pore throat radius, and wherein flowing pore throat radius includes that water flowing pore throat radius and oil stream are dynamic
Pore throat radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through reason
Zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are calculated by pore throat radius and flowing pore throat radius；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness
Influence of the porous media inner boundary layer to be measured to seepage flow is judged with zero dimension oil boundary layer thickness, wherein water boundary layer thickness, oil
Boundary layer thickness, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
Preferably, gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
Preferably, water surveys permeability in the step 1) and oil surveys permeability and passes through SY/T5345-2007 " two-phase in rock
Fluid relative permeability test method " measurement.
Preferably, theoretical pore throat radius is calculated by gas permeability in the step 2), wherein flowing pore throat radius
Permeability is surveyed by water or oil is surveyed computing permeability and obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius
With the difference of flowing pore throat radius, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness
Or the ratio of oily boundary layer thickness and theoretical pore throat radius.
Preferably, theoretical pore throat radius, flowing pore throat radius, water boundary layer thickness and oily boundary thickness in the step 2)
The calculation formula of degree are as follows:
Theoretical pore throat radius isFlowing pore throat radius isOr
Wherein:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
hw- water boundary layer thickness, um；
ho- oil boundary layer thickness, um；
φ-porous media porosity, %.
Preferably, in the step 2) zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness calculation formula
Are as follows:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
φ-porous media porosity, %；
εwThe reasonable ratio by pore throat radius of-zero dimension water boundary layer thickness, i.e. water boundary layer thickness, %；
ε0- zero dimension oil boundary layer thickness, the i.e. reasonable ratio by pore throat radius of oily boundary layer thickness, %.
Preferably, when zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are less than 30% in the step 3)
When, porous media inner boundary layer to be measured is rudimentary to the influence degree of seepage flow；When zero dimension water boundary layer thickness or zero dimension oil
Boundary layer thickness be 30%~60% when, porous media inner boundary layer to be measured to the influence degree of seepage flow be in it is rudimentary；When it is no because
When secondary water boundary layer thickness or zero dimension oil boundary layer thickness are 60%~80%, porous media inner boundary layer to be measured is to seepage flow
Influence degree is middle-and-high-ranking；It is to be measured porous when zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are greater than 80%
Medium inner boundary layer is advanced to the influence degree of seepage flow.
Embodiment 7
Fine and close oil rock heart porous media is selected, wherein core diameter 2.508cm, length 4.309cm, porosity 10.8%,
Gas permeability is 0.143mD, and it is 0.0051mD that water, which surveys permeability, and oil is surveyed permeability 0.0014mD, calculated according to the method described above,
Obtaining theoretical pore throat radius is 0.1029 μm, and it is 0.01943 μm that water flow measurement, which moves pore throat radius, and water boundary layer is with a thickness of 0.08348 μ
M, zero dimension water boundary layer is with a thickness of 81.11%；It is 0.01018 μm that oily flow measurement, which moves pore throat radius, and oily bound thickness is 0.09273
μm, zero dimension oil boundary layer thickness is 90.11%, and the influence according to porous media inner boundary layer to seepage flow obtains fine and close oil rock
Heart porous media water boundary layer thickness and oily boundary layer thickness are advanced, water boundary layer thickness and oil to the influence degree of seepage flow
Boundary layer thickness is high to seepage effect degree.
Embodiment 8
Ultra-low penetration rock core porous media is selected, wherein core diameter 2.492cm, length 5.210cm, porosity
13.67%, gas permeability 0.5705mD, it is 0.1347mD that water, which surveys permeability, and oil surveys permeability 0.1056mD, according to above-mentioned
Method calculates, and obtaining theoretical pore throat radius is 0.1827 μm, and it is 0.08875 μm that water flow measurement, which moves pore throat radius, water boundary layer thickness
It is 0.09397 μm, zero dimension water boundary layer is with a thickness of 51.43%；It is 0.0786 μm that oily flow measurement, which moves pore throat radius, oily bound thickness
It is 0.1041 μm, zero dimension oil boundary layer thickness is 56.98%, and the influence according to porous media inner boundary layer to seepage flow obtains
Ultra-low penetration rock core water boundary layer thickness and oily boundary layer thickness are middle-and-high-ranking, water boundary layer thickness to the influence degree of seepage flow
It is higher to seepage effect with oily boundary layer thickness.
Embodiment 9
Flow in low permeability core porous media is selected, wherein core diameter 2.49cm, length 8.89cm, porosity 13.6%, gas
Survey permeability is 29.49mD, and it is 11.51mD that water, which surveys permeability, and oil surveys permeability 9.46mD, calculates, obtain according to the method described above
Theoretical pore throat radius be 1.3170 μm, water flow measurement move pore throat radius be 0.8228 μm, water boundary layer with a thickness of 0.4992 μm, it is no because
Secondary water boundary layer is with a thickness of 37.53%；It is 0.746 μm that oily flow measurement, which moves pore throat radius, and oily bound thickness is 0.571 μm, zero dimension
Oily boundary layer thickness is 43.36%, and the influence according to porous media inner boundary layer to seepage flow obtains flow in low permeability core water boundary layer
Thickness and oily boundary layer thickness to the influence degree of seepage flow be in it is rudimentary, water boundary layer thickness and oily boundary layer thickness are to seepage flow
Slightly influence.
Embodiment 10
Medium to high permeable rock core porous media is selected, wherein core diameter 2.502cm, length 5.76cm, porosity 14.9%,
Gas permeability is 209.5mD, and it is 118.73mD that water, which surveys permeability, and oil is surveyed permeability 90.98mD, calculated according to the method described above,
Obtain theoretical pore throat radius be 3.3538 μm, water flow measurement move pore throat radius be 2.5249 μm, water boundary layer with a thickness of 0.8289 μm,
Zero dimension water boundary layer is with a thickness of 24.72%；It is 2.4078 μm that oily flow measurement, which moves pore throat radius, and oily bound thickness is 0.9460 μm,
Zero dimension oil boundary layer thickness is 28.21%, and the influence according to porous media inner boundary layer to seepage flow obtains medium to high permeable rock core
Water boundary layer thickness and oily boundary layer thickness are rudimentary, water boundary layer thickness and oily boundary layer thickness to the influence degree of seepage flow
It is negligible to seepage effect.
From embodiment 7~10 as can be seen that influence of the Equivalent boundary layer thickness to seepage flow in different rock core porous medias
Difference, ultra-low penetration rock core water boundary layer thickness and oily boundary layer thickness be to the influence degree of seepage flow it is middle-and-high-ranking, to seepage flow
Influence degree is high；Ultra-low penetration rock core water boundary layer thickness and oily boundary layer thickness be to the influence degree of seepage flow it is middle-and-high-ranking,
It is higher to seepage effect；Flow in low permeability core water boundary layer thickness and oily boundary layer thickness to the influence degree of seepage flow be in it is low
Grade slightly influences seepage flow；Medium to high permeable rock core water boundary layer thickness and oily boundary layer thickness are to the influence degree of seepage flow
It is rudimentary, it is negligible to seepage effect.
The principle of the present invention is as follows:
The present invention is to propose one kind on the basis of analyzing Liquid Flow difference with rock core porous media gas permeability
The theoretical pore throat radius of calculating surveys the difference quantitatively characterizing rock for the flowing pore throat radius that permeability (water phase and oily phase) calculates with liquid
The method of Equivalent boundary layer thickness in heart porous media, and according to boundary layer thickness accounting size (the i.e. zero dimension waterside of calculating
Thickness of boundary layer or zero dimension oil boundary layer thickness) boundary layer quickly judges seepage effect degree, when zero dimension waterside
When thickness of boundary layer or zero dimension oil boundary layer thickness are less than 30%, porous media inner boundary layer to be measured is to the influence degree of seepage flow
It is rudimentary；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are 30%~60%, porous media inner edge to be measured
Interlayer to the influence degree of seepage flow be in it is rudimentary；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness be 60%~
When 80%, porous media inner boundary layer to be measured is middle-and-high-ranking to the influence degree of seepage flow；When zero dimension water boundary layer thickness or nothing
When dimension oil boundary layer thickness is greater than 80%, porous media inner boundary layer to be measured is advanced to the influence degree of seepage flow.
The present invention can Equivalent boundary layer thickness and its accounting in quantitatively characterizing porous media, while can also quantitatively characterizing it is different
The boundary layer thickness and its accounting of type of fluid can be used for evaluating different permeabilities, different physical property fluid, different wetting and not
With the Equivalent boundary layer thickness under pressure.
For the present invention due to the Basic Physical Properties parameter that calculating parameter is rock core porous media, calculating process is simple, can be comparison
The difference for studying different type flow through oil reservoir rule provides foundation, while being easy to carry out boundary layer to the quick of seepage effect degree
Judgement, and judge that accurately efficiency is higher, and error is smaller.
The preferred embodiment for the present invention is explained in detail above, but the present invention is not limited to the above embodiments,
Those of ordinary skill in the art within the scope of knowledge, can also make various without departing from the purpose of the present invention
Variation.
Many other changes and remodeling can be made by not departing from the spirit and scope of the present invention.It should be appreciated that the present invention is not
It is limited to specific embodiment, the scope of the present invention is defined by the following claims.The component that the present embodiment does not describe in detail
With the well-known components and common structure or conventional means of the structure category industry, do not describe one by one here.
Claims (7)
1. a kind of method of Equivalent boundary layer thickness in quantitatively characterizing porous media, which comprises the following steps:
Step 1) measures the gas permeability of porous media to be measured, water surveys permeability, oil surveys permeability and porosity；
The gas permeability for the porous media that step 2) is measured by step 1), water survey permeability, oil surveys permeability and porosity
Theoretical pore throat radius and flowing pore throat radius are calculated, wherein flowing pore throat radius includes water flowing pore throat radius and oily flowing pore throat
Radius calculates water boundary layer thickness and oily boundary layer thickness by theoretical pore throat radius and flowing pore throat radius, passes through theoretical hole
Larynx radius and flowing pore throat radius calculate zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness；
Step 3) is according to the water boundary layer thickness calculated in step 2), oily boundary layer thickness, zero dimension water boundary layer thickness and nothing
Dimension oil boundary layer thickness judges influence of the porous media inner boundary layer to be measured to seepage flow, wherein water boundary layer thickness, oily boundary
Thickness degree, zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are directly proportional to the influence to seepage flow.
2. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 1
In gas permeability and porosity are measured by SY/T5336 " core analysis method " in the step 1).
3. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 1
In " two-phase fluid permeates relatively in rock by SY/T5345-2007 for water survey permeability and oil survey permeability in the step 1)
Rate test method " measurement.
4. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 1
In theoretical pore throat radius is calculated by gas permeability in the step 2), and wherein flowing pore throat radius surveys permeability by water
Or oil is surveyed computing permeability and is obtained, wherein water boundary layer thickness and oily boundary layer thickness are theoretical pore throat radius and flowing pore throat half
The difference of diameter, wherein zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness are water boundary layer thickness or oily boundary thickness
The ratio of degree and theoretical pore throat radius.
5. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 4
In the calculation formula of theoretical pore throat radius, flowing pore throat radius, water boundary layer thickness and oily boundary layer thickness in the step 2)
Are as follows:
Theoretical pore throat radius isFlowing pore throat radius isOr
Wherein:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
hw- water boundary layer thickness, um；
ho- oil boundary layer thickness, um；
φ-porous media porosity, %.
6. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 4
In the calculation formula of zero dimension water boundary layer thickness and zero dimension oil boundary layer thickness in the step 2) are as follows:
Kg-porous media gas permeability, mD；
Kw-porous media water surveys permeability, mD；
Ko-porous media oil surveys permeability, mD；
φ-porous media porosity, %；
εwThe reasonable ratio by pore throat radius of-zero dimension water boundary layer thickness, i.e. water boundary layer thickness, %；
ε0- zero dimension oil boundary layer thickness, the i.e. reasonable ratio by pore throat radius of oily boundary layer thickness, %.
7. the method for Equivalent boundary layer thickness, feature exist in a kind of quantitatively characterizing porous media according to claim 1
In: in the step 3) when zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are less than 30%, porous Jie to be measured
Matter inner boundary layer is rudimentary to the influence degree of seepage flow；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are
When 30%~60%, porous media inner boundary layer to be measured to the influence degree of seepage flow be in it is rudimentary；When zero dimension water boundaries thickness
When degree or zero dimension oil boundary layer thickness are 60%~80%, during porous media inner boundary layer to be measured is to the influence degree of seepage flow
It is advanced；When zero dimension water boundary layer thickness or zero dimension oil boundary layer thickness are greater than 80%, porous media inner boundary layer to be measured
Influence degree to seepage flow is advanced.
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