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

Claim 0:
1. A managed pressure drilling system comprising:
a rotating sealing device; and
a drill string comprising am 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 has:
a first tool joint having a first tool joint outer diameter;
a second tool joint having a second tool joint outer diameter; and
a tubular body between the first and second tool joints having a tubular body outer diameter;

wherein the first tool joint, the second tool joint and the tubular body of drill pipe members of the upper drill string section have substantially the same outer diameter;
wherein the first tool joint outer diameter and/or the second tool joint outer diameter of drill pipe members of the lower drill string section is larger than the tubular body outer diameter of drill pipe member of the lower drill string section; and
wherein the rotating sealing device is configured to form a fluid seal against at least a part of the upper drill string section.