CO2 triaxial seepage test system and method in rock chemical corrosion environment

Abstract

The invention discloses a CO2 triaxial seepage test system and method in a rock chemical corrosion environment, the CO2 triaxial seepage test system comprises a pressure chamber, a gas pressurization system, a bias pressure pump, a confining pressure pump, an exhaust system and a pressure test device, the bottom in the pressure chamber is provided with a platform, a rock sample is placed on the platform, the top in the pressure chamber is provided with an axial dowel bar, and the axial dowel bar is connected with the confining pressure pump. The lower end of the pressure head is in contact with the top of the rock sample; an annular strain gauge is annularly arranged on the rock sample, and axial strain gauges are arranged on the two sides of the rock sample; the gas pressurization system is connected with a gas inlet in the bottom of the rock sample through a pipeline; the exhaust system is connected with an air outlet in the top of the rock sample through a pipeline; the bias pressure pump is connected with the top of the pressure chamber; the confining pressure pump is connected with the bottom of the pressure chamber. According to the invention, rock CO2 permeability tests under different chemical corrosion conditions can be carried out, accurate testing of rock material permeability under different confining pressures, bias pressures and gas permeation pressures is realized, and the device and the method have important engineering practice significance.

Description

technical field [0001] The invention relates to the field of rock mechanics and engineering, in particular to a CO 2 Triaxial seepage test system. Background technique [0002] carbon dioxide (CO 2 ) accounts for more than 60% of all greenhouse gases and is the main factor of the greenhouse effect. Deep saline aquifers are currently one of the most promising geological storage methods. Therefore, the saline surrounding rock CO 2 Permeability is an index to evaluate whether the rock mass has storage conditions. and. The deep rocks are in complex geological conditions, and the rock mass is subjected to corrosion damage of different chemical concentrations, so it is effective to test the CO stored in surrounding rocks under the action of chemical corrosion. 2 Permeability is an important basis for evaluating the safety and feasibility of a project. At present, water permeability testing devices are mostly used in the market to test the permeability of rock concrete and o...

AI Technical Summary

Problems solved by technology

At present, water permeability testing devices are mostly used in the market to test the permeability of rock concrete and other materials, and air permeability testing is mostly used to test the permeability of low-permeability rocks with inert gas. How to accurately and effectively test the CO2 of rocks in chemically corrosive environments? 2 Seepage testing is still not much researched

Images