Test method of rock gas permeability under multi-stage rheological loading
A technology of gas permeability and test method, which is applied in the direction of permeability/surface area analysis, measuring device, suspension and porous material analysis, etc., which can solve the problems of cumbersome measurement and achieve the effect of reducing the test workload
Active Publication Date: 2020-09-11
CENT SOUTH UNIV
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[0006] Purpose of the invention: In view of the problems that the rock gas permeability test method in the prior art can only test the permeability of hydrostatic pressure, and the measurement is cumbersome, the present invention provides a rock gas permeability test method under multi-stage rheological loading
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[0036] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings.
[0037] A method for testing rock gas permeability under multi-stage rheological loading of the present invention comprises the following steps:
[0038] 1) Place the rock sample to be tested in the pressure chamber of the triaxial rheometer and connect the gas path;
[0039] Such as figure 1 , the upstream of the gas path of the triaxial pressure chamber can be connected to the gas source, valve Ⅰ, gas storage cylinder, pressure gauge ①, and valve II through high-pressure conduits in sequence; the downstream of the gas path can also be connected to pressure gauge ② and valve Ⅲ through high-pressure conduits. Pressure gauge ① and pressure gauge ② can be connected to the computer through a digital converter for real-time recording of air pressure data; pressure gauge ① and pressure gauge ② can choose high-precision pressure gauges. The gas in ...
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The invention discloses a rock gas permeability testing method under multistage rheological loading. The method comprises the following steps of (1) connecting a gas path of a pressure chamber; (2) placing an iron block in the pressure chamber, and carrying out system calibration; (3) carrying out physical measurement on a rock sample; (4) placing the rock sample in the pressure chamber, and applying a confining pressure to a set value and keeping constant; (5) continuously applying an osmotic pressure to a preset value into the gas path; and (6) loading deviator stress step by step until therock sample is damaged, carrying out rheological loading after the transient loading of each stage of deviator stress is completed, measuring the gas permeability in an instant= loading process by adopting a flow method, and measuring the gas permeability in a rheological loading process by adopting a steady-state method; and finally, obtaining the rock gas permeability of each stage of the multistage rheological loading. According to the method, the rock gas permeability testing method under the multistage rheological loading is initiated, the loading process is divided into an instant loading part and a rheological loading part, and the measurement of the permeability of the whole rheological process is realized by adopting different testing methods.
Description
technical field [0001] The invention relates to a method for testing rock gas permeability, in particular to a method for testing rock gas permeability under multi-stage rheological loading, and belongs to the fields of rock engineering, low-permeability gas reservoirs and mineral mining. Background technique [0002] Oil storage methods mainly include storage tanks, inner iron wall caverns, underground water-sealed caverns, etc. Underground water-sealed caverns have the advantages of less investment, large reserves, less land occupation, safety, reliability, economy, practicality, and eco-friendliness, and are recognized as "reserves with a high degree of strategic security." Underground water-sealed caverns are suitable for construction in low-permeability rocks with good engineering geological conditions, good rock integrity, few cracks, and weak water permeability. The permeability characteristics and permeability evolution law of cavern surrounding rock are important p...
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IPC IPC(8): G01N15/08
CPCG01N15/0826
Inventor 贾朝军郑艳妮龚琛杰
Owner CENT SOUTH UNIV