True three-dimensional anisotropic permeability tensor testing device and testing method thereof

Abstract

The invention relates to the field of oil and gas field development, and discloses a true three-dimensional anisotropic permeability tensor testing device and a testing method thereof.The true three-dimensional anisotropic permeability tensor testing device comprises a square core holder used for fixing a to-be-tested cubic core and conducting one-dimensional constant-speed displacement on the to-be-tested cubic core in three different directions through fluid, measuring the injection-production pressure and the central pressure of the closed boundary surface; the confining pressure pump is used for pressurizing the square core holder; the displacement pump is used for adding fluid into the square core holder; and the processor is used for obtaining a passive pressure difference ratio according to the injection-production pressure and the central pressure of the closed boundary surface, substituting the passive pressure difference ratio into a pre-established three-dimensional full-tensor permeability intelligent chart, and performing fitting calculation to obtain a real three-dimensional permeability tensor rate of the cubic core to be measured. Therefore, through the interaction of the square core holder, the confining pressure pump, the displacement pump and the processor, the accurate core three-dimensional permeability tensor can be obtained, the operation is simple, the reliability is strong, 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 true three-dimensional anisotropic permeability tensor testing device and a testing method thereof. Background technique [0002] During the process of sedimentary compaction, the arrangement of particles in the rock is directional, and the long axis 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. [0003] As early as the 1930s, people have known about the anisotropy of reservoir permeability, but it is only limited to the difference between the vertical permeability and the horizontal permeability. Since the ...

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Problems solved by technology

At present, there are many studies on two-dimensional anisotropic permeability. This kind of method is equivalent to knowing a main direction. In fact, the bedding structure of most strata is complicated, and the bedding direction cannot be directly judged. Therefore, the complete permeability tensor test should be a 3D tensor test

[0004] In 1995, D.L.Woerdeman et al. proposed a calculation method to invert the core permeability tensor by measuring the equivalent permeability in six different directions of the core, but it is unrealistic for the cubic core to displace other directions except for the three axis directions

Afterwards, many researchers tried to take plunger samples in different directions in the full-diameter core, measure their permeability respectively, and then obtain the anisotropic permeability parameters of the core through special mathematical processing, but these methods are not reliable and practical. sex is not ideal

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 surface 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 be practically applied

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