High-pressure clamped sealing gas injection tool being used for leak detection of tube column and having function of trip prevention

Abstract

The invention provides a high-pressure clamped sealing gas injection tool being used for the leak detection of a tube column and having the function of trip prevention, which comprises two sets of clamped sealing components and a hollow tube type center column of which both ends are sealed; the two sets of clamped sealing components respectively comprise a sliding sleeve which can be sleeved on the center column in a slide way and a tubing sealer. A hollow cavity is arranged between the sliding sleeves and the center column and is sealed by a sealing ring; two through holes are arranged on the center column corresponding to the hollow cavity, are communicated with a center tube cavity and are communicated with the outside, wherein the through holes are respectively provided with a one-way valve, the disconnection and conduction directions of the one-way valves are opposite, and the conduction direction can be conducted at a set pressure difference, thereby forming a pressurization passage and a pressure relief passage. An input hole passage of a leak detection medium is arranged on a hollow tube wall. The lower end of the center column is also provided with a single-flow passage, and a single-flow valve which is outwards disconnected and inwards conducted is arranged in the single-flow passage. The leak detection tool provided by the invention has simple structure, high detection reliability and simple, convenient and easy site operation and can effectively prevent the potential safety hazard of tool trip during pressure relief after detection.

Description

technical field [0001] The invention belongs to the field of leak detection of high-pressure pipe strings, in particular to the field of detection of tightness of oil casing strings in the petroleum and natural gas industry, and provides a high-pressure sealing gas injection tool used for leak detection of pipe strings and having the function of anti-jumping. Background technique [0002] After the high-pressure pipeline is connected or repaired, it is often necessary to perform a leak test on the connected or repaired parts. For example, in the petroleum industry, an oil-casing string is required to complete the transportation of oil and gas. The oil-casing string is composed of oil casing and auxiliary Composition of tools, the oil casing and its auxiliary tools are connected to form a channel for oil and gas flow. In order to ensure that oil and gas in oil wells and gas wells flow out of oil wells or gas wells safely according to the design requirements, the oil and casin...

AI Technical Summary

Problems solved by technology

The above-mentioned detection method cannot be used on site, but only serves to check whether the connecting thread on the oil casing can meet the tightness after connection under the set high pressure, that is, to check whether the thread is qualified, but does not check whether the oil casing actually connected on site. The tightness of the thread at the joint of the casing 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 threaded thread of the oil casing or auxiliary tool that is run into the oil and gas well on site. The sealing condition is good

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