Supercritical carbon dioxide rock fracture seepage device under high temperature and high pressure conditions

Abstract

The invention provides a supercritical carbon dioxide rock fissure seepage device under high temperature and high pressure conditions, comprising: a supercritical carbon dioxide injection system, a pressure control system, a high temperature rock core holder and a temperature control system; The model, the main component is a high-temperature core holder, the pressure control system can effectively detect the pressure of each part, and the temperature control system can control the temperature of the high-temperature core holder, so that the experimental device of the present invention can realize the supercritical carbon dioxide at different temperatures. The physical simulation of fracture seepage under stress state can realize the dynamic change characteristic analysis of the evolution process of fractures in hot dry rock reservoirs under the action of external high temperature and high pressure, and solve the practical problems of energy storage engineering in hot dry rock. The invention has high measurement accuracy, intuitive test results, simple device structure, excellent sealing performance, corrosion resistance and thermal insulation effect, and can be applied to supercritical carbon dioxide rock fracture seepage simulation under different conditions.

Description

technical field [0001] The invention relates to the technical field of rock fissure seepage devices, in particular to a supercritical carbon dioxide rock fissure seepage device under high temperature and high pressure conditions. Background technique [0002] Geothermal resource is a typical clean energy, also known as "green energy" and "renewable energy", which has great utilization value. The enhanced geothermal system (EGS) injects low-temperature fluid, utilizes the characteristics of almost constant temperature in the deep underground, heats up the low-temperature fluid, and pumps it out of the ground to obtain high-temperature fluid. The seepage properties of the underground rock mass and the heat exchange efficiency during the seepage process are the key factors that determine the utilization efficiency of geothermal resources, and are also the technical parameters relied on in the construction design of the enhanced system. [0003] The traditional heat-carrying me...

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Problems solved by technology

However, the current instruments are difficult to meet the needs of hot dry rock development: on the one hand, because supercritical carbon dioxide is corrosive to a certain extent, and the pressure during the experiment is relatively high, the long-term supercritical carbon dioxide seepage experiment has a great impact on the sealing performance and resistance of the device. Corrosion performance puts forward higher requirements; on the other hand, in the traditional seepage experiment, it is necessary to cut the rubber sleeve to take out the core after each experiment, which increases the cost of the experiment, and the rubber sleeve is not strong enough to withstand high pressure and high temperature. Easy deformation affects the accuracy of the experiment; finally, the temperature of the material used for injection in the traditional high-temperature core holder is easily affected by the temperature of the holder, resulting in errors in the experimental results

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