Patent ID: 11952840
Assignee: DEEP BLUE OIL & GAS LIMITED
Field: Civil engineering (Other fields)
Classification: CPC E | IPC E

Claim 12:
13. A method for managed pressure drilling, the method comprising:
providing a managed pressure drilling system, the system comprising:
a rotating sealing device; and
a drill string comprising an upper drill string section and a lower drill string section, wherein the upper and lower drill string sections each comprise a plurality of drill pipe members, wherein each drill pipe member comprises a tubular pipe body with connectors at either end thereof;
wherein the connectors and the tubular pipe body of each drill pipe member of the upper drill string section have substantially the same outer diameter; and
wherein the outer diameter of the connectors of the drill pipe members of the lower drill string section is larger than the tubular pipe body outer diameter of drill pipe members of the lower drill string;

lowering the drill string into a tubular connected to a well;
forming a fluid seal between at least one section of the upper drill string section and a tubular in the well;
passing at least one part of the drill string through the rotating sealing device; and
drilling the wellbore.