A reusable pipe end seal

Abstract

The invention discloses a pipe end sealing device capable of being repeatedly used, which comprises a taper cutting ferrule, an outer taper sleeve joint, a ferrule-type compression joint and a nut; wherein one end of the ferrule-type compression joint is provided with a cavity, an external thread I is machined at the outer wall of the cavity; a long hole, which is used for water injection or air exhaust, is drilled in the other end of the ferrule-type compression joint along the center line, and is communicated with the cavity; an external thread II is machined at the outer wall of the long hole, and is matched with the nut; one end of the outer taper sleeve joint is provided with a threaded hole matched with the external thread I, the other end is provided with a taper hole, and the taper hole is matched with the outer taper surface of the taper cutting ferrule; a through hole, matched with the external diameter of a pipe end is formed in the taper cutting ferrule; when a full pipe body fatigue test is carried out, the pipe end is directly sealed by the mutual cooperation of the taper cutting ferrule, the outer taper sleeve joint, the ferrule-type compression joint and the nut, technologies such as choke plug processing and choke plug welding are avoided, so that the technological process is shortened, and the pipe end sealing device can be disassembled and used repeatedly.

Description

Technical field: [0001] The invention belongs to the technical field of pipe end sealing, in particular to a reusable pipe end sealing device. Background technique: [0002] Coiled Tubing (CT) is a new type of tubing for oil and gas well operations. It can carry tools for various operations in the fields of workover, logging, drilling, and completion. Its operation types basically cover oil and gas exploration and development. All types, the pipe diameter is usually 1in. (25.4mm) - 3.5in. (88.9mm). [0003] When the coiled tubing is subjected to the full-pipe body fatigue test, it is necessary to apply a bending load to the coiled tubing under internal pressure conditions, and the pipe end is usually sealed by welding plugs. This method requires processing a series of plugs according to the diameter and wall thickness of the coiled tubing. , and weld the plug to the pipe end before the experiment. The process is cumbersome. If the welding quality is not good, it will also c...

AI Technical Summary

Problems solved by technology

[0003] When the coiled tubing is subjected to the full-pipe body fatigue test, it is necessary to apply a bending load to the coiled tubing under internal pressure conditions, and the pipe end is usually sealed by welding plugs. This method requires processing a series of plugs according to the diameter and wall thickness of the coiled tubing. , and weld the plug to the pipe end before the experiment, the process is cumbersome, if the welding quality is not good, it will also lead to pressure release during the experiment, so that the test cannot continue normally, resulting in invalid test

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