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

Claim 16:
17. A method for drilling a well, comprising:
providing a drilling system, the system comprising:
a rotating sealing device; and
a plurality of drill pipe members comprising first drill pipe members and second drill pipe members, wherein each drill pipe member comprises a tubular pipe body with connector joints at either end thereof;
wherein first drill pipe members have connector joint outer diameters which are larger than the outer diameter of the tubular pipe body;
wherein second drill pipe members have connector joint outer diameters which are substantially the same as the outer diameter of the tubular pipe body;
wherein the first drill pipe members are configured to be connected to form a first drill string section and the second drill pipe members are configured to be connected to form a second drill string section;

drilling a first section of the well using the first drill string section comprising a plurality of first drill pipe members;
connecting second drill pipe members to the first drill string section;
forming a fluid seal between a tubular connected in the well and an outer surface of at least part of a second drill pipe member in the second drill string section;
passing at least part of the second drill string through the rotating sealing device; and
drilling a second section of the well at a pre-determined fluid annular pressure.