Patent ID: 7677319

Claim:
A tree cap for a subsea tree having an annulus bore and a production bore, the tree cap comprising: a cylindrical body having an upper end and a lower end, the cylindrical body having an upper fluid port in communication with a lower fluid port; a cap connected to the upper end of the cylindrical body, the cap including an opening through the cap; a rod positioned through the opening in the cap, the rod having an upper end above the cap and a lower end positioned within the cylindrical body; a cam connected to the rod within the cylindrical body; a spring positioned about the rod between the cap and the cam, the spring being biased to move the cam from an upper position to a lower position; a lower locking dog movable between an inner position and an outer position, wherein in the inner position the lower locking dog retains the cam in its upper position; a seal carrier slideably connected to the cylindrical body, the seal carrier being selectively movable between a first position and a second position and having an upper seal and a lower seal, wherein in the first position the seal carrier retains the lower locking dog in its inner position and in the second position the seal carrier releases the lower locking dog and the upper seal and lower seal of the seal carrier isolate the annulus bore from the production bore; a sleeve having an upper seal and a lower seal and being slideably connected to the upper end of the cylindrical body, the sleeve being movable between a first position, a second position, and a third position, wherein in the first position and the second position the upper seal and the lower seal of the sleeve hydraulically isolate the upper fluid port of the cylindrical body; a housing connected around the sleeve, the housing creating a cavity between the sleeve and the housing; an upper locking dog selectively movable between an inner position and an outer position, the upper locking dog being biased to its inner position, wherein in its outer position the upper locking dog is adapted engage a profile in the subsea tree; a plate connected to the cylindrical body; syntactic foam connected to the plate; a hot stab injector selectively connected to the plate and being in fluid communication with the cavity between the housing and the sleeve, wherein fluid pressure applied through the hot stab injector moves the sleeve from the first position to the second position moving the upper locking dog to its outer position; wherein fluid pressure applied through the hot stab injector moves the sleeve from the second position to the third position moving the upper seal past the upper fluid port of the cylindrical body, the upper fluid port being in fluid communication with the cavity between the sleeve and the housing; and wherein fluid pressure applied through the hot stab injector passes through the upper fluid port to the lower fluid port and moves the seal carrier to the second position releasing the lower locking dog to move to its outer position.