Device and method for testing tri-axial strength of rock under supercritical carbon dioxide condition

Abstract

The invention discloses a device for testing tri-axial strength of a rock under a supercritical carbon dioxide condition. The device comprises a tri-axial test cabin (1), a rock core clamping device, a gas supply system, a hydraulic oil confining pressure loading system (2) and a computer, wherein a controller and an experiment data acquisition device are arranged in the computer; a heating ring (2) and an oil inlet valve (6) and an oil return valve (7) communicated with the tri-axial test cabin (1) are arranged on the outer wall of the tri-axial test cabin (1); the rock core clamping device consists of a rock core clamping device (10), an air cushion (11), an insulating self-sticking sealing belt (12) and a thermal shrinkable sleeve (13); the gas supply system consists of a carbon dioxide gas bottle (14), a gas supercharger (15) and an air compressor (16) which are sequentially connected. The invention also provides a testing method. The device and the method have the beneficial effects that tri-axial strength measurement of the rock under the supercritical carbon dioxide condition is realized well; the device is convenient and feasible to refit, small in measurement errors, high in working efficiency and high in carbon dioxide utilization rate.

Description

technical field [0001] The invention relates to the technical field of measuring the triaxial strength of rock under the condition of supercritical carbon dioxide, in particular to a device and method for measuring the triaxial strength of rock under the condition of supercritical carbon dioxide. Background technique [0002] With the continuous development of domestic oil and gas field development and the continuous expansion of overseas business, the technical requirements for the development of unconventional special oil and gas reservoirs at home and abroad are getting higher and higher. The use of supercritical carbon dioxide to develop unconventional oil and gas resources has also attracted widespread attention from all walks of life. A comprehensive understanding and mastery of the mechanical parameters of formation rocks under supercritical carbon dioxide conditions will provide an important basis for formulating oil and gas field development plans and guiding on-site...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the defects in the existing rock mechanics experiment method technology, such as carbon dioxide cannot reach the supercritical state, supercritical carbon dioxide cannot be injected into the rock core, and rock triaxial strength cannot be measured under supercritical carbon dioxide conditions, etc., to provide a modified Device and method for measuring triaxial strength of rock under supercritical carbon dioxide conditions, which is convenient and easy to operate, safe and simple to operate, small in measurement error, high in work efficiency, and high in carbon dioxide utilization rate

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