CN107290259B - The calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs - Google Patents

The calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs Download PDF

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CN107290259B
CN107290259B CN201610191329.XA CN201610191329A CN107290259B CN 107290259 B CN107290259 B CN 107290259B CN 201610191329 A CN201610191329 A CN 201610191329A CN 107290259 B CN107290259 B CN 107290259B
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pore throat
radius
throat radius
effective
seepage flow
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CN107290259A (en
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殷艳玲
孙志刚
王军
房会春
荣毅
孙强
李培伦
李新
罗惠平
杨伟宇
陈亚宁
张玉利
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Henan Oilfield Branch Co
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China Petroleum and Chemical Corp
Exploration and Development Research Institute of Sinopec Henan Oilfield Branch Co
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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

Abstract

The present invention provides a kind of calculation method of effective seepage flow pore throat radius of low permeability sandstone reservoirs, and the calculation method of the effective seepage flow pore throat radius of the low permeability sandstone reservoirs includes: step 1, and the capillary pressure curve of testing rock core obtains reservoir micropore structure distributed data；Step 2, single pore throat is calculated to the contribution rate of permeability according to the distributed data of pore structure；Step 3, each pore throat radius is subtracted into pore throat radius lower limit value, obtains the distributed data of effective radius；Step 4, according to the distribution of effective pore throat data, effective seepage flow pore throat radius is calculated.The calculation method of the effective seepage flow pore throat radius of the low permeability sandstone reservoirs can quantitatively calculate the effective radius of the practical seepage flow of low permeability reservoir, and for the percolation ability of rationally assessment LOW PERMEABILITY RESERVOIR, effective exploitation lays the foundation.

Description

The calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs
Technical field
The present invention relates to porous media features to the theoretical research technology neck of the underground fluids seepage effect such as petroleum, natural gas Domain especially relates to a kind of calculation method of effective seepage flow pore throat radius of low permeability sandstone reservoirs.
Background technique
When flowing of the Study of Fluid in porous media, it is necessary to consider the influence of porous media.In porous media spy In sign, it is most important that its pore structure characteristic, the i.e. shape, size of pore throat, distribution and its interconnected relationship.Wherein pore throat Size is the most common characterization parameter of pore structure.Since the pore structure of low permeability reservoir belongs to the thin larynx type of aperture, permeability Contribution margin is mainly provided by larger pore throat, and therefore, in low permeability reservoir there are a part of pore throats does not contribute permeability.Cause This, mean radius the problem of cannot sufficiently reflecting reservoir fluid flow radius of currently used characterization Pore throat size.For this purpose, I From low permeability reservoir pore structure characteristic, consider that liquid acts on admittedly, invented a kind of meter of low permeability sandstone reservoirs effective radius Calculation method solves the above technical problem.
Summary of the invention
The object of the present invention is to provide a kind of effective radiuses that can quantitatively calculate the practical seepage flow of low permeability reservoir, rationally to comment Estimate the percolation ability of LOW PERMEABILITY RESERVOIR, the calculating side of the effective seepage flow pore throat radius of the low permeability sandstone reservoirs that effective exploitation lays the foundation Method.
The purpose of the present invention can be achieved by the following technical measures: the meter of the effective seepage flow pore throat radius of low permeability sandstone reservoirs Calculation method, the calculation method of the effective seepage flow pore throat radius of the low permeability sandstone reservoirs include: step 1, the capillary pressure of testing rock core Curve obtains reservoir micropore structure distributed data；Step 2, single pore throat pair is calculated according to the distributed data of pore structure The contribution rate of permeability；Step 3, each pore throat radius is subtracted into pore throat radius lower limit value, obtains the distributed data of effective radius； Step 4, according to the distribution of effective pore throat data, effective seepage flow pore throat radius is calculated.
The purpose of the present invention can be also achieved by the following technical measures:
In step 1, formula is utilizedCalculate pore throat radius, in formula, riFor rock core pore throat radius, μm；PciFor Into mercury pressure, MPa；Utilize formulaCalculate throat distribution frequency, in formula, fiFor distribution frequency, decimal；ΔsiFor phase The difference of adjacent mercury saturation degree, percentage；smaxIt is maximum into mercury saturation degree, percentage.
In step 2, by formulaSingle pore throat is calculated to the contribution rate of permeability, in formula, KJIt is a certain The permeability contribution that pore throat radius can be provided, decimal；riFor rock core pore throat radius, μm；fiFor distribution frequency, decimal.
It in step 2, adds up to all pore throat contribution rates, pore throat radius is done into figure with corresponding accumulation contribution rate, is used in combination Binomial relationship is fitted, and obtains the relational expression K of accumulation contribution rate and pore throat radiusJ=ar2+ br+c, in formula, KJFor The permeability contribution that a certain pore throat radius can be provided, decimal；R is rock core pore throat radius, μm；A, b, c are constant, utilize this Relational expression seeks corresponding pore throat radius lower limit value r when permeability accumulation contribution rate is 98%98。
In step 4, formula R is utilizedy=∑ ryi·fiCalculate effective seepage flow pore throat radius, in formula, RyFor effective seepage flow pore throat Radius, μm；ryiFor rock core pore throat effective radius, μm；fiFor distribution frequency, decimal.
The calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs in the present invention is related to microscopic seepage experiment point Analysis is the important method for studying underground fluids percolation laws in porous media such as petroleum gas.With Exploitation Level of Oilfield Continuous improvement, further increase the recovery percent of reserves of low permeability reservoir, be guarantee oil field sustainable and stable development important directions.The party Method considers that liquid acts on admittedly from low permeability reservoir pore structure characteristic, not for currently used mainstream radius and mean radius The problem of capable of sufficiently reflecting reservoir Test Liquid Permeability of Core, establishes the calculation method for being suitable for the effective seepage flow pore throat radius of LOW PERMEABILITY RESERVOIR, Preferably to characterize the effective percolation ability of low permeability reservoir.The effective seepage flow pore throat radius calculation method of the low permeability sandstone reservoirs can determine Scale sign environmental liquids enter actual effective percolation ability after reservoir, lay the foundation for the effective exploitation of LOW PERMEABILITY RESERVOIR.
Detailed description of the invention
Fig. 1 is the stream of a specific embodiment of the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs of the invention Cheng Tu；
Fig. 2 is the relational graph of cumulative contribution rate and pore throat radius in a specific embodiment of the invention.
Specific embodiment
To enable above and other objects, features and advantages of the invention to be clearer and more comprehensible, preferably implementation is cited below particularly out Example, and cooperate shown in attached drawing, it is described in detail below.
As shown in FIG. 1, FIG. 1 is the processes of the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs of the invention Figure.
Step 101, the capillary pressure curve of testing rock core obtains reservoir micropore structure distributed data, utilizes formulaCalculate pore throat radius, in formula, riFor rock core pore throat radius, μm；PciFor into mercury pressure, MPa；Utilize formulaCalculate throat distribution frequency, in formula, fiFor distribution frequency, decimal；ΔsiFor the difference of adjacent mercury saturation degree, percentage Number；smaxIt is maximum into mercury saturation degree, percentage.
Step 102, formula is pressed according to the distributed data of pore structureSingle pore throat is calculated to permeability Contribution rate, in formula, KJFor the permeability contribution that a certain pore throat radius can be provided, decimal；riFor rock core pore throat radius, μm；fi For distribution frequency, decimal.It adds up to all pore throat contribution rates, pore throat radius is done into figure with corresponding accumulation contribution rate, is used in combination Binomial relationship is fitted, and obtains the relational expression K of accumulation contribution rate and pore throat radiusJ=ar2+ br+c, in formula, KJFor The permeability contribution that a certain pore throat radius can be provided, decimal；R is rock core pore throat radius, μm；A, b, c are constant.Utilize this Relational expression seeks corresponding pore throat radius lower limit value r when permeability accumulation contribution rate is 98%98；
Step 103, by each pore throat radius riSubtract pore throat radius lower limit value r98, obtain effective radius ryiDistribution number According to；
Step 104, according to the distribution of effective pore throat data, formula R is utilizedy=∑ ryi·fiCalculate effective seepage flow pore throat half Diameter, in formula, RyFor effective seepage flow pore throat radius, μm；ryiFor rock core pore throat effective radius, μm；fiFor distribution frequency, decimal.
Illustrate the specific technical solution of the invention by taking the calculating of Shengli Oil Field somewhere block rock sample effective radius as an example:
Step 1, the capillary pressure curve of testing rock core obtains micropore structure distributed data (as shown in table 1)；Pore throat The calculation formula of radius are as follows:
Wherein: riFor rock core pore throat radius, μm；PciFor into mercury pressure, MPa.
The calculation formula of distribution frequency are as follows:
Wherein: fiFor distribution frequency, decimal；ΔsiFor the difference of adjacent mercury saturation degree, percentage；smaxIt is full into mercury for maximum And degree, percentage.
1 capillary pressure test data of table
Step 2, single pore throat is calculated to the contribution rate of permeability and right by formula (3) according to the distributed data of pore structure All pore throat contribution rates add up, and calculating process is as shown in table 2；
In formula: KJFor the permeability contribution that a certain pore throat radius can be provided, decimal.
Contribution rate calculating process of 2 pore throat of table to permeability
Cumulative contribution rate and pore throat radius are done into figure, such as Fig. 2, obtain the relation formula (4) of the two, is obtained by formula (4) KJCorresponding pore throat radius lower limit value is 0.369 μm when=0.98；
KJ=-0.5239r2+0.1562·r+0.992 (4)
Step 3, pore throat radius each in rock core micropore structure is subtracted to the contributive pore throat radius of permeability 0.369 μm of lower limit value, the distributed data for obtaining effective pore throat is as shown in table 3；
The effective throat distribution of table 3
Step 4, according to the distribution of effective pore throat data, effective seepage flow pore throat radius is calculated.
Ry=0.3691 × 0.3980+0.1247 × 0.1354=0.164 μm.

Claims (5)

1. the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs, which is characterized in that the low permeability sandstone reservoirs are effectively seeped Stream pore throat radius calculation method include:
Step 1, the capillary pressure curve of testing rock core obtains reservoir micropore structure distributed data；
Step 2, single pore throat is calculated to the contribution rate of permeability according to the distributed data of pore structure；
Step 3, each pore throat radius is subtracted into pore throat radius lower limit value, obtains the distributed data of effective radius；
Step 4, according to the distribution of effective pore throat data, effective seepage flow pore throat radius is calculated.
2. the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs according to claim 1, which is characterized in that Step 1, formula is utilizedCalculate pore throat radius, in formula, riFor rock core pore throat radius, μm；PciFor into mercury pressure, MPa；Utilize formulaCalculate throat distribution frequency, in formula, fiFor distribution frequency, decimal；ΔsiFor adjacent mercury saturation degree Difference, percentage；smaxIt is maximum into mercury saturation degree, percentage.
3. the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs according to claim 1, which is characterized in that Step 2, by formulaSingle pore throat is calculated to the contribution rate of permeability, in formula, KJFor a certain pore throat radius institute The permeability contribution that can be provided, decimal；riFor rock core pore throat radius, μm；fiFor distribution frequency, decimal.
4. the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs according to claim 3, which is characterized in that Step 2, it adds up to all pore throat contribution rates, pore throat radius and corresponding accumulation contribution rate is done into figure, and with binomial relationship It is fitted, obtains the relational expression K of accumulation contribution rate and pore throat radiusJ=ar2+ br+c, in formula, KJFor a certain pore throat half The permeability contribution that diameter can be provided, decimal；R is rock core pore throat radius, μm；A, b, c are constant, are sought using this relational expression Permeability accumulates corresponding pore throat radius lower limit value r when contribution rate is 98%98。
5. the calculation method of the effective seepage flow pore throat radius of low permeability sandstone reservoirs according to claim 1, which is characterized in that Step 4, formula R is utilizedy=∑ ryi·fiCalculate effective seepage flow pore throat radius, in formula, RyFor effective seepage flow pore throat radius, μm； ryiFor rock core pore throat effective radius, μm；fiFor distribution frequency, decimal.
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CN108959723B (en) * 2018-06-11 2023-05-30 东北石油大学 Method for discussing permeability main control factors of tight sandstone reservoir
CN109100278B (en) * 2018-07-18 2020-02-14 西南石油大学 Apparent permeability calculation method considering shale pore size distribution characteristics
CN110186843B (en) * 2019-04-24 2020-03-20 中国矿业大学 Device and method for measuring effective influence radius of high-pressure medium injected into drill hole
CN112326523A (en) * 2020-09-18 2021-02-05 中国石油天然气股份有限公司 Method and device for acquiring pore throat characteristic parameters, computer equipment and storage medium
CN112966365B (en) * 2021-02-04 2023-09-12 中海石油(中国)有限公司 Method for evaluating reverse condensation injury of ultralow condensation gas reservoir

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