Experimental device for improving permeability of shale gas storage layer in supercritical CO2 fracturing process

Abstract

The invention discloses an experimental device for increasing the permeability of a shale gas storage layer in the supercritical CO2 fracturing process, which comprises a gas source supply system, a gas supercharger, a pressure chamber, a temperature controller and a data automatic acquisition system. A shale test piece of which the center is drilled is arranged in the pressure chamber; the gas source supply system is communicated with a gas inlet pipe of the pressure chamber by the gas supercharger; both the gas supercharger and the pressure chamber are arranged in the temperature controller; and the data automatic acquisition system is used for carrying out real-time acquisition on the stress-strain relation, the pressure, the temperature, an acoustic emission signal and the like in the shale fracturing process and measuring the seepage characteristics of shales before and after the supercritical CO2 fracturing. The device disclosed by the invention can be used for simulating the dynamic variation of the permeability of the shale gas storage layer in the supercritical CO2 fracturing process under the multifield (the ground stress, the temperature and the pressure) coupling conditions and provides an experimental platform for researching the mechanism of increasing the permeability of the shale gas storage layer in the supercritical CO2 fracturing process.

Description

technical field [0001] The present invention relates to a kind of supercritical CO 2 An experimental device for fracturing to increase the permeability of shale gas reservoirs, especially a device capable of performing supercritical CO 2 An experimental device for the experimental study of the mechanism of fracturing shale gas reservoirs and the study of the law of shale stress-strain-permeability changes during the fracturing process. Background technique [0002] my country's demand for natural gas is growing day by day, the amount of imported natural gas is increasing day by day, and the degree of dependence on foreign countries is also increasing, which seriously threatens my country's energy security. my country's shale gas resources are very rich, and the efficient development of shale gas is of great significance for alleviating the contradiction between energy supply and demand in my country, adjusting the energy structure, and ensuring energy security. Due to the...

AI Technical Summary

Problems solved by technology

Existing experimental devices can only conduct experimental research on hydraulic fracturing. For supercritical CO 2 However, there are the following deficiencies: (1) CO cannot be effectively controlled 2 (2) It cannot simulate the supercritical CO under multi-field (in-situ stress, temperature, pressure) coupling conditions 2 Dynamic changes of shale gas reservoir permeability during fracturing

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