Center hole sealing and locking apparatus for tubing hanger of underwater horizontal Christmas tree

Abstract

The invention provides a center hole sealing and locking apparatus for a tubing hanger of an underwater horizontal Christmas tree. The apparatus comprises an apparatus body internally provided with an apparatus body inner ring. A motivating ring is arranged in the apparatus body inner ring, a limit ring is arranged at the top potion of the apparatus body, and the limit ring can prevent the motivating ring from getting out of the apparatus body inner ring. The middle upper portion of the apparatus body is circumferentially and uniformly provided with multiple rectangular through holes, and each rectangular through hole is provided with a clamping tooth. The outer ring of the motivating ring is in contact with the inner walls of the clamping teeth in a matching manner. The motivating ring drives the clamping teeth to expand outwardly when the motivating ring moves downwardly. The motivating ring matches the clamping teeth and performs self-locking when the motivating ring downwardly moves to the bottom. The sealing and locking apparatus is simple in structure. By employing the apparatus, the difficulty of underwater operation is reduced, the time and cost for the underwater operation are saved, the time for installation and delivery operation is shortened, a replacing process for sealing members is simplified, the sealing success rate by one time is improved, and better sealing effects are achieved.

Description

technical field [0001] The invention relates to a sealing and locking device, in particular to a sealing and locking device for a center hole of a christmas tree oil pipe hanger. Background technique [0002] During the underwater oil development of the subsea tree, the tubing hanger of the Christmas tree is located inside the tree body, and the center hole of the tubing hanger at the upper part of the production channel of the tubing hanger needs to be completely plugged and sealed. [0003] At present, the method of blocking, locking and sealing the central hole of the oil pipe hanger is usually screwed and fixed, and sealed with a non-metallic part. Using the above traditional methods, the sealing effect cannot be effectively guaranteed, and the success rate of one-time sealing is low. The threaded rotary fixing method will also cause wear to the non-metallic seal during the installation process, and the installation time is long. In addition, the seal will be corroded b...

AI Technical Summary

Problems solved by technology

Using the above traditional methods, the sealing effect cannot be effectively guaranteed, and the success rate of one-time sealing is low

The threaded rotary fixing method will also cause wear to the non-metallic seal during the installation process, and the installation time is longer. In addition, the seal will be corroded by the medium liquid, which will affect the service life.

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