Patent ID: 7296628

Claim:
A method of removing fluid from a well bore and riser, the method comprising the following steps: (a) attaching a swivel to a drill string, the swivel including a mandrel and a sleeve, the sleeve being rotatably connected to the mandrel; (b) inserting the swivel into the riser, the riser being fluidly connected to the well bore, the riser and well bore being fluidly connected to a blowout preventer, the blow-out preventer being located at a first level, the riser and well bore being at least partially filled with a first fluid, the first fluid being at a level in the riser which is above the first level; (c) detachably connecting the blowout preventer to the sleeve thereby separating the first fluid into an upper section of the first fluid, located above the first level, and a lower section of the first fluid, located below the first level; (d) displacing a portion of the lower section of the first fluid; (e) displacing a portion of the upper section of the first fluid; and (f) wherein in step “a” the sleeve includes at least one catch, the catch tending to restrict longitudinal movement of the sleeve relative to the blow out preventer.