Subsea safety valve system

摘要

A valve system for ensuring well closure upon exposure to a predetermined condition even where a well access line is disposed through the valve. This system may be configured with a supplemental power supply capable of effectuating a cutting closure of the valve. Thus, any obstructing well access line such as coiled tubing may be cut during closure to ensure sealing off of the well, even if the cutting mechanism is separated from its traditional power supply by shear or parting of a portion of the landing string. Once more, the supplemental power sufficient for a cutting closure is only provided in the event of a predetermined condition such as the emergence of a potentially hazardous tubular separation.

主权项

1. A safety valve assembly for control of a subsea well below an offshore platform, the assembly comprising:
a separation segment of a landing string providing tubular access to the platform, said segment for separating upon exposure to a predetermined condition; a valve segment positioned below said separation segment and for governing access to the well; a supplemental power segment positioned below said separation segment to provide supplemental powering upon the separating of said separation segment; and a relay mechanism coupled to said separation segment and said supplemental power segment to communicate the separating of said separation segment for triggering the supplemental powering by said supplemental power segment.