Microseismic-shearing-seepage coupling testing device and experiment method

Abstract

The invention provides a microseismic-shearing-seepage coupling testing device and experiment method, and relates to the technical field of experiment testing. The device comprises a barrel, a monitoring system and a pressure control system, wherein a confining pressure cavity, an axial compression piston and a gas injection chamber are arranged in the barrel; a rubber piston is arranged in the confining pressure cavity; the axial compression piston is provided with a shear displacement meter; a gas pipe plunger, an electric heating wire, a stress sensor, a microseismic sensor and a clamping device are arranged in the gas injection chamber; the monitoring system comprises a strain monitoring system, a temperature monitoring system, a microseismic monitoring system and a flow monitoring system; and the pressure control system comprises a gas cylinder, a control valve, a gas pipe and a flowmeter. By use of the device, microseismic event numbers, shear displacement, permeability and the like in a constant-temperature constant-pressure loading process can be recorded, a corresponding relationship between the microseismic-shear displacement and a rate is analyzed, and data fitting is carried out to obtain a corresponding relationship of microseismic-pore pressure-permeability. Each above parameter is used, and especially a relationship between microseism and the permeability is usedfor guiding the prediction of coal bed gas capacity in engineering application.

Description

technical field [0001] The invention relates to the technical field of testing and testing, in particular to a rock test piece testing device under the coupling action of microseismic-shearing-seepage, and a test method for studying the relationship between microseismic energy and seepage by using the device. Background technique [0002] Coalbed methane is a hydrocarbon gas that exists in coal seams and coal-measure formations, and is a high-quality clean energy. Coalbed methane resources are rich in reserves, but due to its complex geological conditions and extremely low permeability (about 10 -4 ~10 -3 mD), which is much lower than the standard of economic exploitation of CBM under the current technology. Although a series of production stimulation technologies (such as fracturing, heat injection displacement, etc.) have been adopted at present, the production of CBM wells still generally has the problems of low daily gas production, rapid decay, and the total gas produ...

AI Technical Summary

Problems solved by technology

Based on the current research, it is difficult to explain the interaction law of multi-field coupling between coal and rock mass only by studying the physical properties of coal and the permeability under ideal conditions, and it is not conducive to practical application

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