Patent ID: 9347283
Filing Date: 2016-05-24
CPC Classification: E21B

Claim Text:
1. A method of performing operations in a well bore, the method comprising the following steps: (a) attaching a swivel to a drill string, the swivel including a mandrel having a longitudinal axis and a sleeve, the sleeve being rotatably connected to the mandrel, and the sleeve including at least one catch that restricts the extent of longitudinal movement of the sleeve relative to a vertical position of an annular blow-out preventer by contact with a closed annular seal of the annular blow-out preventer; (b) inserting the swivel into the annular blow-out preventer, the blow out preventer being fluidly connected to a wellbore and a riser; (c) detachably connecting the blowout preventer to the sleeve fluidly separating the riser from the wellbore; (d) during a time period while the blowout preventer is detachably connected to the sleeve and the at least one catch is in contact with the closed annular seal of the annular blow-out preventer, and where high differential pressure exists above the annular seal of the annular blowout preventer in the riser, and below the annular seal of the annular blow-out preventer in the wellbore, and which high differential force attempts to push the sleeve vertically out of the closed annular seal, performing operations in the wellbore, wherein the at least one catch includes a contacting surface, and the contacting surface being substantially perpendicular to the longitudinal axis of the mandrel.