High-pressure airtight simulation device for underground packing system and use method thereof

Abstract

The invention discloses a high-pressure airtight simulation device for an underground packing system and a use method thereof. The simulation device comprises a steel pipe body, wherein a first detection assembly is arranged on the outer side of the steel pipe body; an upper packer assembly and a lower packer assembly are arranged in the steel pipe body, and the upper packer assembly communicates with the lower packer assembly through a communicating floral tube and a high-pressure connecting tube; and a detection water outlet is formed in the communicating floral tube, and a second detection assembly is arranged on the outer side of the middle of the steel pipe body. The use method comprises the following steps of (S1) installing the first detection assembly and the second detection assembly on the steel pipe body; (S2) installing the upper packer assembly and the lower packer assembly; (S3) plugging the lower packer assembly and the upper packer assembly into the steel pipe body; (S4) injecting water into the upper packer assembly and the lower packer assembly; (S5) injecting water into a fracturing section; (S6) judging the sealing performance of the upper packer assembly and the lower packer assembly; and (S7) taking out the upper packer assembly and the lower packer assembly.

Description

technical field [0001] The invention relates to the field of geological detection, in particular to a high-pressure airtight simulation device for an underground isolation system and a use method thereof. Background technique [0002] Since the pioneering of hydraulic fracturing to measure ground stress, the method has been further improved and promoted. Hydraulic fracturing (HF) and primary fracture hydraulic fracturing test (HTPF) currently carried out in boreholes are very effective means to determine the total stress tensor, and are also one of the methods recommended by the International Society of Rock Mechanics for determining in-situ stress. . [0003] In the past 20 years, the method has been widely used in engineering design carried out in various geological formations, such as underground repositories for nuclear waste, hydroelectric power stations, high-speed rail tunnels, etc. These results provide a unique data support in determining the effectiveness of in-s...

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Problems solved by technology

[0005] However, under actual test conditions, since the sealability of the packer under high-pressure working conditions is unknown, if the sealability of the packer is poor under high-pressure conditions, water leakage in the fracturing section or packer failure may occur. The phenomenon of being fixed on the hole wall forces the test to fail; and if there is less water leakage, the instantaneous closing pressure will be smaller than the true value, thus affecting the ground stress measurement results

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