Method for evaluating rock permeability

A permeability and rock technology, applied in the field of permeability testing of building materials, can solve the problems of complex testing methods, comparison of permeability of multiple rock samples, inconvenient operation, etc., and achieves convenient operation, simple device and improved testing accuracy. Effect

Inactive Publication Date: 2012-01-25
ZHONGYUAN ENGINEERING COLLEGE
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Problems solved by technology

[0004] The object of the present invention is to provide a kind of method for evaluating rock permeability, and described method for this evaluation rock permeability will solve the relatively complicated rock permeability testing method in the prior art, inconvenient operation and inability to test multiple rocks. technical issues in performing permeability comparisons

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  • Method for evaluating rock permeability
  • Method for evaluating rock permeability

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Embodiment Construction

[0010] The present invention will be described in further detail below through embodiments in conjunction with the accompanying drawings.

[0011] Such as figure 1 As shown, the method includes four processes of rock sample preparation, rock sample saturation, electrochemical impedance spectroscopy test and rock sample permeability evaluation:

[0012] (1) Preparation of rock samples: Take the rocks to be tested, use ordinary sample preparation tools, and drill and cut them into discs (cylinders) with a diameter of 39.1 mm and a height of 5-80 mm. The height of the disc is determined by the rock Density is determined.

[0013] (2) Saturation of the rock sample: prepare 5% NaCl solution, place the prepared rock sample in it, determine the saturation time according to the compactness of the rock and the height of the sample, generally 24 hours.

[0014] (3) Electrochemical Impedance Spectroscopy Test: Coat both ends of the saturated sample with conductive glue and connect wire...

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Abstract

The invention relates to a method for evaluating the rock permeability. The method comprises processes of preparation of a rock test sample, saturation of the rock test sample, test of an electrochemical impedance spectroscopy and evaluation of the permeability of the rock test sample. Middle arcs of rock test sample Nyquist curves under the same test condition are compared; the smaller the radius of the arc is, the higher the rock permeability is; and the larger the radius of the arc is, the lower the rock permeability is. A device required by the method for evaluating the rock permeability is simple. The method for evaluating the rock permeability has high measurement accuracy and is convenient to operate.

Description

technical field [0001] The invention relates to a method for testing the permeability of building materials, in particular to a method for evaluating the permeability of rocks. Background technique [0002] Permeability is an important property of porous and fractured media. The range of rock permeability coefficient distribution exceeds 10 orders of magnitude. In general, the fields of petroleum engineering and hydrogeology focus on aquifers and oil-reservoir rocks with higher permeability coefficients; while the research fields of seismic and structural geology focus on non-sedimentary rocks with lower permeability coefficients. Rock is a low-permeability medium, and the laboratory testing methods include constant flow pump method, pressure oscillation method and transient pressure pulse method, etc. The most commonly used transient pressure pulse method is to obtain the permeability by measuring the pressure change of the pressure vessel at both ends of the sample. Afte...

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Application Information

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IPC IPC(8): G01N15/08
Inventor 胡江春边亚东王红芳
Owner ZHONGYUAN ENGINEERING COLLEGE
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