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Two-dimensional anisotropic permeability tensor testing method and device

A technology of anisotropy and test method, applied in measurement devices, permeability/surface area analysis, suspension and porous material analysis, etc., can solve problems such as unrepeatable experiments, unsatisfactory reliability and practicability, and complicated experimental operations.

Pending Publication Date: 2022-07-01
CHINA UNIV OF PETROLEUM (BEIJING)
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Problems solved by technology

In 1948, W.E.Johnson and R.V.Hughes proposed a method specially used to measure the anisotropic permeability tensor of the formation plane, which was in line with the characteristics of anisotropic cores. Calculation Method of Main Value of Anisotropic Permeability
In 2005, Liu Yuetian and others drilled the full-diameter core along the axis, injected fluid into the core from the central hole, formed a radial plane flow perpendicular to the core axis in the core body, and measured the flow and pressure on the outer surface in different directions. This method is consistent with the anisotropic characteristics of the core, but the experimental operation is more complicated, and it is difficult to obtain a complete full-diameter core and drill holes, which limits the promotion of this method
In 2000, Mahmoud.Asadi and others proposed to determine a main direction of the core and its main value of permeability by repeatedly cutting the core and changing the orientation of the core until the flow distribution on the end face of the core is uniform. In theory, this method can indeed accurately find the three-dimensional permeability of the core. Rate tensor, but the operation is too complicated to repeat the experiment, and it is difficult to apply in practice
[0004] In addition, many researchers tried to take plunger samples in different directions from the full-diameter core, measure their permeability respectively, and then obtain the anisotropic permeability parameters of the core through special mathematical processing, but the reliability and practicability of these methods Neither is ideal, and it is difficult to avoid the problem of heterogeneity

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Embodiment Construction

[0043] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0044] The invention provides a two-dimensional anisotropic permeability tensor testing method, such as figure 1 shown, including the following steps:

[0045] S101. Perform one-dimensional displacement of the square layered rock sample along two mutually perpendicular directions to obtain the passive pressure difference ratio and the test flow rate;

[0046] It should be understood that in the traditional one-dimensional core displa...

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Abstract

The invention relates to the field of oil and gas field development, and discloses a two-dimensional anisotropic permeability tensor testing method and device.The method comprises the steps that one-dimensional displacement is conducted on a square layered rock sample in the two directions perpendicular to each other, and the passive differential pressure ratio and the testing flow are obtained; fitting by utilizing a pre-established two-dimensional full-tensor permeability standard chart and the obtained passive differential pressure ratio to obtain a proportional relation between a permeability principal axis direction and a principal value; assuming a group of permeability tensors based on the fitted permeability principal axis direction and principal value proportional relation, and solving the flow by using an experimental pressure difference condition; and obtaining the real permeability tensor of the square layered rock sample according to the ratio of the obtained flow to the test flow and the assumed permeability tensor. Therefore, the accurate rock sample permeability tensor can be obtained by testing indoors, the reliability is high, and the applicability is high.

Description

technical field [0001] The invention relates to the field of oil and gas field development, in particular to a two-dimensional anisotropic permeability tensor testing method and device. Background technique [0002] During the process of sedimentary compaction, the arrangement of particles is directional, and the long axis of the particles is mainly parallel to the direction of water flow, so the rock will show anisotropy, and the permeability anisotropy has a very significant impact on the development effect of oil and gas fields. 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 ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/08
CPCG01N15/0806G01N15/0826G01N2015/0034
Inventor 裴雪皓刘月田王靖茹
Owner CHINA UNIV OF PETROLEUM (BEIJING)
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