High-pressure multiphase-flow coupling rock true-triaxial test system and method

Abstract

The invention discloses a high-pressure multiphase-flow coupling rock true-triaxial test system and method and relates to a rock mechanic test technique. The system is established by arranging a rock sample in a center of a pressure confining chamber, arranging load cushion blocks around the rock sample, enabling a pressing shaft in an X direction to tightly press left and right load cushion blocks, and enabling a pressing shaft in a Y direction to tightly press front and rear load cushion blocks; respectively connecting a pore carbon dioxide metering pump and a pore water metering pump to a computer through controllers to realize fluid control; respectively connecting an acoustic emission sensor and an LVDT displacement sensor to the computer to acquire acoustic emission signals and displacement signals. The method comprises the following steps of: 1) rock sampling processing; 2)rock sample sealing; 3) pipeline connection; 4) system airtightness check; 5) vacuum pumping; 6) prestress loading; 7) pore fluid loading; 8) testing; 9) equipment tidying; 10) test data organization. The system can acquire mechanical and deformation parameters of rock under a high-pressure carbon dioxide and water coupled condition, so as to carry out studies on mechanical properties, deformation mechanisms and the like of rock under the high-pressure carbon dioxide and water coupled condition.

Description

technical field [0001] The invention relates to rock mechanics test technology, in particular to a high-pressure multiphase flow coupled rock true triaxial test system and method. Background technique [0002] The massive emission of greenhouse gases is one of the main factors affecting global warming. CO 2 Capture, storage and utilization technology has become one of the key technologies for reducing carbon dioxide emissions in the world. Deep underground saline water layers, abandoned well fields for oil and gas resources exploitation, deep sea, and unconventional oil and gas reservoirs (unconventional resources such as shale oil and gas, coal bed methane, and tight oil) are the main places for carbon dioxide sequestration. in CO 2 The analysis and evaluation of site mechanical stability is an essential link in geological storage projects. CO 2 Underground engineering such as geological storage (CCS), development of unconventional oil and gas resources, and CO2 drilli...

AI Technical Summary

Problems solved by technology

In recent years, a number of coupled analysis software for two-phase fluid mechanics has emerged as the times require, but due to the lack of experimental basis and constitutive models for rock mechanical properties under the action of CO2-water two-phase fluid, the numerical simulation results still cannot meet the engineering needs

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