Importance

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Abstract

A remotely installed pressure containing closure having a slight negative buoyancy, and a method for assembly of a slight negative buoyancy remotely installed pressure containing closure, such as a tree cap, on a subsea assembly, having at least one fluid bore, and more preferably a production bore and an annulus bore, wherein the remotely installed pressure containing closure comprises: a guidance ring having a plurality of chambers; optionally, a plurality of orientation pins affixed to the guidance ring for aligning the guidance ring to a funnel; buoyant material disposed in the chambers of the guidance ring to assist in creating a slight negative buoyancy for the remotely installed pressure containing closure; a cylinder connected to the remotely installed pressure containing closure for engaging sealing means on a subsea assembly for sealing at least one seal of at least one fluid bore of said subsea assembly; a debris cover connected to said cylinder to house equipment and cover the fluid bore; a mandrel having at least one fluid bore disposed under said debris cover; an actuator secured to said cylinder; a plurality of locking dogs attached to said actuator by a plurality of rotatable rods for locking down said remotely installed pressure containing closure onto said mandrel; a rotatable handle secured to said actuator; a handle extension rod connected to said handle; a handle locking sleeve connected to said handle extension rod; and a locking ring in slidable engagement with said handle locking sleeve for engaging said ring against said subsea mandrel; and at least one dual function stab port for receiving a stab to activate the hydraulic cylinder.

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First Claim