Stress-chemical coupling visualization testing system for laminated salt rock

Abstract

The invention discloses a stress-chemical coupling visualization test system of interbedded salt rock, which includes a specimen holder, an axial chemical solution adding system, a confining pressure loading system, and a nuclear magnetic resonance imaging system; the holder includes a tubular device body, upper plug, lower plug, upper plug, lower plug, tubular sealing sleeve, heating layer, etc.; the test system of the present invention can conveniently control and adjust the pressure, temperature, The confining pressure and the temperature environment, and with the help of the nuclear magnetic resonance imaging system, can visually analyze the seepage path and seepage amount of oil in the bedding zone of the interbedded salt rock under a certain confining pressure condition; it can simulate when the surrounding rock is under stress After cracking and damage under action, liquid solution infiltrates along the cracks to produce different degrees of corrosion on salt rocks or interlayers, weakens the surrounding rocks, and promotes new cracks to produce this coupling superposition effect, revealing the stress-chemistry of bedding in the salt cavern oil storage process Coupling effects and permeability.

Description

technical field [0001] The invention relates to test equipment, in particular to a test equipment for studying long-term creep of salt rock under multi-field coupling action. Background technique [0002] As the blood of industry, petroleum occupies a very important position in the national economy. Once an oil crisis occurs, it will lead to serious consequences such as economic recession and social unrest. Since the reform and opening up, China's economy has maintained rapid development, and the demand for oil is also increasing day by day. According to the "Report on the Development of Oil and Gas Industry at Home and Abroad" issued by the China National Petroleum Corporation Economic and Technological Research Institute in 2016, my country's oil consumption in 2015 was 543 million cubic meters, and its dependence on foreign countries was as high as 60.6%. my country's oil and gas production capacity is seriously insufficient and must rely heavily on imports. However, t...

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Problems solved by technology

The large burial depth of underground salt cavern storage makes the hydrostatic pressure of stored oil high, especially the large pressure difference change in the process of injection and production will accelerate rock mass damage, coupled with the chemical erosion and deterioration of oil / brine, the underground storage The environment is more complex and its security posture is more difficult to predict

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