A connection device for an offshore test string release system

Abstract

The invention discloses a connection device for a release system of an offshore test pipe string, which relates to the field of petroleum exploration. The device is connected with an upper pipe string through an upper connection head, and the other end is connected with a lower connection head. The lower pipe strings are connected, the lower part of the upper connecting head is equipped with a ball lock device, and the outer part of the upper connecting head is also equipped with a piston. The up and down movement of the piston is realized by remote hydraulic control. To realize the locking and separation of the device, the connector is also covered with a housing, and the housing is also provided with an auxiliary unlocking device, which can realize the functions of automatic unlocking and manual unlocking. The upper connector and the lower connector Inside there is a hydraulic pipeline that can provide power for the lower power unit, and the hydraulic pipeline is connected and closed through the connection and separation of the upper shuttle valve and the lower shuttle valve.

Description

technical field [0001] The invention relates to the field of petroleum and natural gas exploration and development, in particular to a connection device for a release system of an offshore test string. Background technique [0002] Oil and gas well testing operations are carried out on floating drilling devices such as semi-submersible platforms or drilling ships at sea. In case of emergency, it is necessary to disconnect the test string immediately underwater and reconnect it after the condition returns to normal. There is a need for a connection device capable of quick disconnection and tieback of the pipe string. Contents of the invention [0003] The purpose of the present invention is to propose a connection device for the release system of the offshore test pipe string, so that it can solve the problem of failure of locking and unlocking caused by the imbalance of internal and external pressure of the connection device, and solve the problem of its lack of positionin...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to propose a connection device for the release system of the offshore test pipe string, so that it can solve the problem of failure of locking and unlocking caused by the imbalance of internal and external pressure of the connection device, and solve the problem of its lack of positioning in the circumferential direction, which causes the two parts of the connection device to be sheared. The problem of shear stress, solve the problem that the shuttle valve cannot be quickly unlocked, solve the problem of insufficient locking and unlocking performance of the locking device, solve the problem of excessive resistance caused by the contact of the locking device by the line, and solve the problem that the automatic unlocking fails. The problem with manual unlocking, a hydraulic safety device for deepwater testing wellhead strings

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