Patent ID: 11913290
Assignee: MAKO RENTALS, INC.
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 3:
4. A method of performing operations in a wellbore, 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 with the sleeve including at least one catch that restricts the extent of longitudinal movement of the sleeve relative to a blow-out preventer by contact with a closed seal of the blow-out preventer, wherein there are upper and lower end portions of the mandrel and sleeve, and the swivel includes a plurality of packing units between the upper and lower end portions of the mandrel and the sleeve, the plurality of packing units preventing leakage of fluid between the mandrel and the sleeve, at least one of the packing units in the plurality of packing units comprising a lubricating seal, wherein the plurality of packing units include a seal comprising metal filled teflon, and the blowout preventer being fluidly connected to a wellbore and a riser;
(b) detachably connecting the blowout preventer to the sleeve by closing the blowout preventer on the sleeve which detachable connection fluidly separates the riser from the wellbore;
(c) 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 blow-out preventer, and where high differential pressure exists between the blow-out preventer and the wellbore, and which high differential force tending to push the sleeve vertically out of the closed seal, performing operations in the wellbore, wherein the at least one catch in combination with the closed blow out preventer prevents the sleeve from being pushed vertically out of the closed blow out preventer.