Supercritical carbon dioxide fracturing and permeability testing integrated experimental device and method

Abstract

The invention belongs to the technical field of unconventional natural gas development experiments, and discloses a supercritical carbon dioxide fracturing and permeability testing integrated experimental device. The device comprises a gas source system, an in-situ environment simulation system and a pulse testing system; the in-situ environment simulation system is used for providing an experimental environment for simulating the real formation temperature and stress state for a rock core test piece; the gas source system is used for providing a test gas source for the in-situ environment simulation system and providing a gas source for the fractured rock core test piece; the pulse testing system is used for carrying out pulse test on the rock core test piece to obtain the permeability. With the device and method adopted, a supercritical carbon dioxide directional fracturing shale experiment under a simulated formation condition can be realized, the (axial and radial) permeability of a rock core before and after fracturing can be tested in situ. The device and method have the advantages of intelligence, convenience in operation and the like compared with a traditional experiment method and experiment equipment. The in-situ environment simulation system simulates the field working condition more vividly, so that a measurement result is more real and accurate.

Description

technical field [0001] The invention belongs to the technical field of unconventional natural gas development experiments, and in particular relates to an experimental device and method integrating supercritical carbon dioxide fracturing and permeability testing. Background technique [0002] Shale gas has great development prospects in my country. However, conventional hydraulic fracturing is not ideal for the exploitation of many shale gas reservoirs. Supercritical CO 2 Fracturing technology can overcome many shortcomings of conventional hydraulic fracturing, and has a good application prospect. Further, through shale drilling radial prefabricated fracture directional fracturing technology can control fracture initiation and expansion in a predetermined direction to achieve The anti-reflection effect of specific regions of the reservoir. However, the existing directional fracturing technology mainly adopts hydraulic fracturing technology, and the mechanism and effect of s...

AI Technical Summary

Problems solved by technology

However, the existing directional fracturing technology mainly adopts hydraulic fracturing technology, and the mechanism and effect of supercritical carbon dioxide directional fracturing technology on shale reservoirs are still unclear; on the other hand, under the formation conditions, the existing test The device cannot simultaneously and accurately perform supercritical carbon dioxide directional fracturing experiments and permeability tests before and after directional fracturing

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