Water pressure test in borehole multichannel multiplexing rapid pressure relief device and method

Abstract

The invention discloses a water pressure test in borehole multichannel multiplexing rapid pressure relief device. The device comprises a lower core sleeve connector, a middle core sleeve connector, anupper core sleeve connector, an upper core pipe hole and a lower core pipe hole, wherein the upper core pipe hole and the lower core pipe hole are formed in a core pipe; a gland is arranged on the top of a core sleeve, a plug joint is arranged at the bottom of the core sleeve, a first connector communicated with the core sleeve is formed at the upper end of the plug joint, and a second connectoris arranged at the lower end of the plug joint; the upper end of the core pipe stretches upwards to be out of the gland, the lower end of the core pipe stretches downwards to be out of the core sleeveand is located in the plug joint; a sealing element is arranged between the core pipe and the core sleeve; the upper core sleeve connector, the middle core sleeve connector and the lower core sleeveconnector are arranged on the sealing element from top to bottom in sequence, and the core sleeve is provided with a core sleeve drain hole communicated with a drill hole. The device has the advantages that a pipeline device is simplified, capsule water stop is reliable, and convenience is brought to capsule rapid complete pressure relief. The invention further discloses a pressure relief method of the water pressure test in borehole multichannel multiplexing rapid pressure relief device.

Description

technical field [0001] The invention relates to the technical field of borehole pressure water test, more specifically, it is a multi-channel switching rapid pressure relief device for borehole pressure water test. More specifically, it is a fast pressure relief device for a water stop plug in a borehole pressurized water test suitable for the condition of large buried depth of groundwater. More specifically, it is a multi-channel conversion rapid pressure relief device for drilling water pressure tests suitable for general water pressure tests and deep hole high pressure water pressure tests of geological drilling for water conservancy and hydropower. The invention also relates to a pressure relief method of a multi-channel conversion rapid pressure relief device for a borehole pressure water test. Background technique [0002] Borehole pressure water test is a kind of in-situ permeability test of rock mass in borehole. The main task is to measure the water permeability of...

AI Technical Summary

Problems solved by technology

The embolism is the main equipment in the blocking isolation test section of the pressurized water test. After a large number of field tests, the hydraulic embolism is more reliable and flexible than other types of embolism, but there has always been a problem of drainage and pressure relief after the test, especially in the deep groundwater borehole After the pressure water test, because the water head in the drill pipe is relatively high, and there is no correspondingly high groundwater level balance pressure in the borehole, a large water head difference is formed inside and outside the test section, and the capsule is affected by the high water head pressure in the drill pipe. It is always in an inflated state, and it is difficult to release the pressure and return to its original state. During the test, it is very easy to cause a capsule stuck hole accident, resulting in direct loss, or even the entire hole is scrapped.

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