Subsea master valve apparatus
AssigneeSchlumberger Technology Corporation
InventorsHoward L. McGill, Ervin Randermann, Jr., Olgierd J. Musik
Life of this patent
Estimating the term…
Abstract
A control valve apparatus adapted to be positioned within a subsea blowout preventer stack for controlling the flow of fluid from an offshore well includes a ball valve element provided with the capability of cutting coil tubing typically employed in well workover and completion operations. The ball element has a cutting edge that coacts with the valve seat to shear the tubing, and a relief slot that receives the tubing during cutting to prevent the tubing from being placed in double shear. Hydraulically operable means is provided to assist in closure of the ball valve element and consequent cutting of tubing extending into the well, in case of emergency.
Claims16
Valve apparatus comprising:
- a tubular valve body having an axially extending flow passage;
- spherical annular seat means surrounding said flow passage;
- a ball element in said valve body and having a throughbore aligned with said flow passage in the open position and an outer spherical surface engageable with said seat means in the closed position;
- and means for rotating said ball element between open and closed position;
- said ball element having cutting means cooperable with said seat means for cutting in two a tubular member extending through said bore, and relief means for preventing a tubular member from being placed in double shear during cutting thereof by said cutting means.
Valve apparatus comprising:
- a tubular valve body having an axially extending flow passage;
- spherical annular seat means surrounding said flow passage;
- a ball element mounted in said valve body and having a throughbore aligned with said flow passage in the open position and an outer spherical surface engageable with said seat means in the closed position;
- means for rotating said ball element between open and closed position including eccentric means on said valve body and means for shifting said ball element longitudinally of said valve body and said eccentric means to cause rotation of said ball element relative to said seat means;
- said ball element having cutting means at the intersection of said bore with said outer spherical surface for cutting in two a tubular member extending through said bore, and relief means in said ball element generally opposite said cutting means and said spherical outer surface for preventing a tubular member from being placed in double shear cutting thereof by said cutting means.
Dependencies are inferred from the claim text.