Leak detection tool applied to high pressure gas leak detection method

Abstract

A leak detection tool applied to a high pressure gas leak detection method, comprising a packer and a detection gas-collecting casing; the packer is arranged in an oil string to be detected or a casing string or an auxiliary tube, is located at two sides of a connecting thread buckle part to be detected and likely to leak, and is used for establishing inner confined space which is capable of filling with tracer gas and is otherwise called plenum space; the detection gas-collecting casing is arranged outside the oil string or the casing string or the auxiliary tube, is located in the connecting thread buckle part likely to leak, and covers the connecting thread buckle part to establish outer confined space which is capable of detecting leak and is otherwise called detection space; the plenum space is connected with a high pressure vent pipe on a pressurized container to facilitate high pressure tracer gas to enter. The detection space is connected with a detector of the tracer gas by being provided with a pipeline. The leak detection tool provided by the invention has simple structure, high detection reliability and convenient and practical field operation.

Description

technical field [0001] The invention belongs to the field of leak detection of high-pressure pipe strings, especially the field of leak detection of tubing strings and casing strings in the petroleum and natural gas industry, and provides a leak detection method for high-pressure gas that can quickly detect the tightness of tubing strings and casing strings leak detection tool. Background technique [0002] After the high-pressure pipeline is connected or repaired, it is often necessary to conduct a leak test on its connection or repaired parts. For example, in the oil industry, oil pipes, casings and their auxiliary tools are required to complete the transportation of oil and gas. Tubing strings and casing strings It is the tubing, casing and auxiliary tools connected together, which form the channel for oil and gas flow. This string of tubing is collectively called tubing string or casing string. In order to ensure that oil and gas in oil wells and gas wells flow out of o...

AI Technical Summary

Problems solved by technology

The above detection methods cannot be used on site, but only to check whether the connecting thread on the oil pipe or casing can meet the tightness after connection under the set high pressure, that is, to check whether the thread is qualified, but not to the actual connection on site. The tightness of the thread at the joint of the pipe string is tested. The laboratory test conclusion can only show that the connecting thread can achieve the required sealing degree, but it cannot ensure the actuality of the thread of the tubing or casing or the auxiliary tool that is lowered into the oil and gas well on site. The sealing condition is good

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