Test tool for subsea blowout preventer stack

Details Test tool for subsea blowout preventer stack Test tool for subsea blowout preventer stack

E - Fixed Constructions

21

B

166/50

E21B 33/06 (2006.01) E21B 17/06 (2006.01) E21B 47/10 (2006.01)

Patent

CA 1209469

ABSTRACT A test tool adapted for use during pressure testing of a subsea blowout preventer stack is dis- closed. The tool has upper and lower body means con- nected in a first connection by left hand threads. A wellhead sealing tool is attached to the lower body means for sealing the wellhead. A check valve landed in the bore of the tool prevents downward fluid flow from the interior of the tool, but allows upward flow through the tool and the attached drill pipe for the detection of leakage of the wellhead sealing tool about the wellhead during pressure testing of a blowout pre- venter in the stack. During testing of a shear ram blowout preventer, the upper body means is disconnected from the lower body means by turning the drill pipe to the right. Raising the drill pipe then causes the up- per body means to shift a second set of right hand threads into position and moves the upper body means and the drill pipe from the bore of the shear ram al- lowing it to be closed for pressure testing. The lower body means and connected wellhead sealing tool may be retrieved without tripping the drill string by lower- ing the upper body means for reconnection to the lower body means by the right hand threads of the upper body means engaging a second set of right hand threads on the lower body means. After reconnection, drain ports are open in the tool allowing the drill pipe to be raised while draining drilling fluid from its interior.

453325

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