Blowout preventer seal assembly and method of using same
AssigneeNational Oilwell Varco, L.P.
InventorsPerry Lee McClanahan, James Allen Douty, Richard M. Ward
Life of this patent
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Abstract
A shear sealing system of a blowout preventer of a wellbore is provided. The blowout preventer including a housing having a bore and a guideway therethrough. A tubular of the wellbore is positionable in the bore. The shear sealing system includes at least one carriage, at least one blade and at least one seal. The carriages are slidably positionable in the guideway of the blowout preventer. The blades are carried by the carriages and movable thereby between a retracted position and an extended position. The blades are engageable with the tubular when in the extended position. The seal forms a seal about the tubular and with the blade when the blade is in the extended position.
Claims29
A shear sealing system of a blowout preventer of a wellbore, the wellbore having a tubular therein, the blowout preventer comprising a housing having a bore and a guideway therethrough, the tubular positionable in the bore, the shear sealing system comprising:
- at least one carriage slidably positionable in the guideway of the blowout preventer;
- at least one blade carried by the at least one carriage and movable thereby between a retracted position and an extended position, the at least one blade engageable with the tubular when in the extended position;
- and
- at least one seal forming a seal about the tubular and with the at least one blade when the at least one blade is in the extended position.
A blowout preventer positionable about a wellbore, the wellbore having a tubular therein, comprising:
- a housing having a bore and a guideway therethrough, the tubular positionable in the bore;
- and
- a shear sealing system, comprising:
- at least one carriage slidably positionable in the guideway of the blowout preventer;
- at least one blade carried by the at least one carriage and movable thereby between a retracted position and an extended position, the at least one blade engageable with the tubular when in the extended position;
- and
- at least one seal forming a seal about the tubular and with the at least one blade when the at least one blade is in the extended position.
A method of forming a seal about a tubular of a wellbore, the method comprising:
- providing a blowout preventer, comprising:
- a housing having a bore and a guideway therethrough, the tubular positionable in the bore;
- and
- a shear sealing system comprising at least one carriage, at least one blade carried by the at least one carriage and at least one seal;
- engaging the tubular with the at least one blade by slidably positioning the at least one carriage in the guideway of the blowout preventer and moving the at least one blade between a retracted position and an extended position;
- and
- forming a seal about the tubular and between the at least one seal and the at least one blade when the blade is in the extended position.
The method of claim 25, wherein the engaging comprises shearing the tubular.
The method of claim 26, wherein the shearing comprises one of piercing, cutting, raking, shaving, severing and combinations thereof.
The method of claim 28, wherein the forming comprises sealingly engaging the upper blade with the upper seal and sealingly engaging the lower blade with the lower seal.
Dependencies are inferred from the claim text.