Testing method and device for anisotropic permeability

Abstract

An anisotropic permeability testing method and a device relates to seal the upper and lower end surfaces of a column full-diameter core and then drills along a central axis to form a round hole eye, arranges the core vertically and injects a liquid into a central hole of the end surface; the liquid enters the core body through a hole at a shaft center, forms a radiation plane flow vertical to the axis of the core in the core body, and then flows out from the side surfaces surrounding the core; the flow rate or flow speed of different directions of the external surface of the core is measured and simultaneously the difference between the injection pressure of the central hole and the pressure of the external surface of the core is recorded; the direction of the highest flow speed is the main direction of the biggest penetrance and the direction of the smallest flow rate is the main direction of a smallest penetrance; the main value of the penetrance is calculated and obtained according to the difference of the internal and external pressures of the core and the main direction of the penetrance. Based on the analysis of the anisotropic permeability, the invention provides a method and a device for testing two-dimension anisotropic permeability, gives out a test data processing and anisotropic permeability calculating formula and builds a perfect anisotropic permeability testing calculating method.

Description

technical field [0001] The invention relates to a method and a corresponding device for measuring rock permeability in a laboratory in the field of oil and gas field development. In particular, it refers to a technique for measuring the anisotropic permeability in the formation plane by using the non-uniform radial flow of the whole core for sedimentary anisotropic reservoirs; it is also applicable to general anisotropic media. Background technique [0002] The determination of formation permeability is the basis of oil and gas field development, and laboratory core test analysis is the most direct and reliable method among various permeability determination methods. There are two types of anisotropic permeability, one is formed by sedimentation, and the other is caused by fracture. The anisotropic permeability of reservoir fractures can only be tested in the oil field, and the laboratory core test is mainly aimed at the anisotropic permeability of sediments. [0003] As e...

AI Technical Summary

Problems solved by technology

However, due to the lack of anisotropic seepage analysis inside the core, the method for calculating the main value of the anisotropic permeability cannot be given; the data processing simply uses the isotropic core radial flow formula, which will inevitably lead to incorrect results

At the same time, it is difficult to accurately measure the flow distribution on the outer wall of the core when gas is used as a fluid medium

[0005] (2) R.A.Grenkorn and C.R.Johnson proposed a similar test method in 1964, but still did not solve the above problems

[0006] (3) Subsequent researchers changed their thinking and tried to measure with methods similar to conventional core testing, and then obtained the anisotropic permeability parameters of the core through special mathematical processing, but the reliability and practicability of these methods are not enough powerful

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