Method for combined measurement of permeability and porosity of dense rock under dynamic confining pressure

Abstract

The invention discloses a method for combined measurement of permeability and porosity of a dense rock under dynamic confining pressure. A device for realizing the method comprises a confining pressure control device, a rock core pressure chamber, a downstream air cylinder, an upstream air cylinder, a pressure loading device, an upstream air pressure recorder, a downstream air pressure recorder, an upstream-downstream air pressure difference recorder and a computer. According to the method for the combined measurement of permeability and porosity of the dense rock under dynamic confining pressure provided by the invention, few physical quantities need to be measured, the operation is easy, and dynamic measurement of permeability and porosity under complex stress is realized. In addition, the method has the advantages that the measurement time is short and the accuracy is high for dense rocks with a permeability less than 10 to 17m<2> and a porosity less than 1.5%, and can automatically record the test data; the test result is accurate; the test efficiency is improved; and test data under different pressures are obtained to calculate the permeability and porosity at one time.

Description

technical field [0001] The invention relates to a method for jointly measuring tight rock permeability and porosity under dynamic confining pressure. Background technique [0002] With the development of the national economy, the development of underground resources has shifted from shallow to deep rock mining, as well as the construction of hydropower stations and digging tunnels in areas with complex geological conditions. The engineering construction in the above-mentioned areas is faced with the design and construction under complex stress conditions and the long-term stability of the project under seepage conditions. Therefore, how to quickly and efficiently measure the permeability parameters of rocks, such as permeability and porosity, has become an urgent problem to be solved. [0003] At present, a single method and equipment are mostly used for the measurement of permeability and porosity. For example, a permeameter is used to measure permeability and a porosity m...

AI Technical Summary

Problems solved by technology

[0003] At present, a single method and equipment are mostly used for the measurement of permeability and porosity. For example, a permeameter is used to measure permeability and a porosity meter is used to measure porosity. Measurement of lower permeability and porosity in a wide range

In this way, there are many physical quantities to be measured, which not only wastes time, but also due to the influence of rock loading and unloading, the measured dynamic changes of permeability and porosity with confining pressure are inaccurate

[0004] In order to solve the problem that the traditional measurement method cannot combine the measurement of permeability and porosity; there are many physical quantities to be measured, the method is cumbersome, time-consuming and labor-intensive; it is impossible to measure the permeability and porosity under different confining pressures

Images