Supercritical CO2 fluid fracturing enhancement type geothermal system experimental device and method

Abstract

The invention relates to a supercritical CO2 fluid fracturing enhancement type geothermal system experimental device and method. Supercritical CO2 is injected through a gas source supply system and gas source supercharging equipment, accurate stress is applied to a rock core by designing a piston device, the permeability of hot dry rock fluid is maintained by adopting a pressure-proof and temperature resistant perforated plate, the hot dry rock fluid is externally connected to a fluid collecting chamber through a flow guiding groove, and meanwhile an adjustable sound emission probe is embeddedinto the fluid collecting chamber to monitor a sound emission event happening when a fracture expands in the hydraulic fracturing process. The supercritical CO2 fluid fracturing enhancement type geothermal system experimental device and method have the beneficial effects that integrated collection of information of hydraulic fracturing, strain, sound emission, permeability, heat energy recovery efficiency and the like of rock can be achieved under a confining pressure condition by utilizing the device, and the fracture initiation and expanding situations of a hydraulic fracture of the hot dryrock are researched; and a fracture initiation behavior and an expansion state of the hydraulic fracture under the high-temperature and high-pressure environmental conditions can be monitored in realtime, and meanwhile the heat energy mining rate can be calculated.

Description

technical field [0001] The invention relates to a physical simulation experiment device and method, in particular to a supercritical CO2 fluid fracturing enhanced geothermal system experiment device and method, mainly using supercritical CO 2 A physical simulation experiment of hot dry rock fracturing as a fracturing fluid medium. Background technique [0002] Hot dry rocks generally refer to high-temperature crystalline rocks with a depth below 3000m and a temperature of 150-350°C. The huge heat energy released by them can be used as an effective supplement to conventional fossil energy, and at the same time, there is no greenhouse gas emission. Therefore, its exploration and development has attracted worldwide attention. common concern of governments. The development of deep high-temperature hot dry rock is called an enhanced geothermal system, which can be divided into high-temperature rock mass type and volcanic type according to the utilization form, and generally requ...

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Problems solved by technology

For the use of supercritical CO 2 For fluid fracturing hot dry rocks, the current research has the following shortcomings: (1) cannot effectively simulate the generation environment of hot dry rocks; (2) cannot effectively control CO 2 phase state, guaranteeing supercritical CO 2 Generation of fracturing fluid; (3) Supercritical CO cannot be analyzed in real time 2 During the fracturing process, the hydraulic fracture shape of the hot dry rock reservoir can analyze the dynamic change of the permeability before and after fracturing of the hot dry rock and evaluate the development effect of supercritical fluid fracturing

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