Simulation test system for upward drilling low-temperature fluid fracturing and method thereof

Abstract

The invention discloses a simulation test system for upward drilling low-temperature fluid fracturing and a method thereof. The simulation test system for the upward drilling low-temperature fluid fracturing includes a true triaxial loading device, a data monitoring device and a low-temperature fluid injection device; the true triaxial loading device can independently apply pre-stress to a specimen in three directions; the low-temperature fluid injection device injects a low-temperature fluid into the upward borehole, and can discharge the vaporized low-temperature fluid in the borehole in time through a negative pressure effect, so that the upward borehole is filled with the low-temperature fluid, and the low-temperature fluid fully acts on the upward borehole wall to perform low-temperature fluid fracturing; and the data monitoring device can monitor the entire process of low-temperature fluid fracturing from the beginning of low-temperature fluid injection, so as to monitor the changes in pressure, temperature, acoustic emission and phase changed gas discharge flow during the entire process of low-temperature fluid fracturing, and provide data basis for follow-up research; in addition, in order to ensure the safety of the test process, a safety relief valve is used for preventing the specimen from exploding due to excessive air pressure in the upward borehole.

Description

technical field [0001] The invention relates to a simulation test system and method for cryogenic fluid fracturing of upward drilling, belonging to the technical field of coal seam fracturing tests. Background technique [0002] China is rich in unconventional natural gas resources and has great potential for development, among which the recoverable resources of coalbed methane are about 10.87×10 12 m 3 , the recoverable resources of shale gas are 15×10 12 ~25×10 12 m 3 In the next 10 to 20 years, China's unconventional natural gas production will increase significantly, and it will play an increasingly important role in making up for the shortage of conventional oil and gas production. Although the reserves of unconventional natural gas resources in my country are large, the reservoirs are complex and dense. The main reservoir space is nano-scale pore-throat system, and micron-millimeter-scale pores are locally developed. Therefore, enhanced anti-reflection measures ar...

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Problems solved by technology

[0004] Through investigation, it is found that there are few researches on cryogenic fluid fracturing in the industry, especially the development of a true triaxial simulation test system for cryogenic fluid fracturing is even blank. True triaxial simulation is important for promoting the field application of cryogenic fluid fracturing It is an indispensable part. At present, the core difficulty in the development of this system is how to effectively make the cryogenic fluid fully act on the upward drilling wall and how to carry out comprehensive data measurement on the test process, while ensuring safety.

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