公开(公告)号：CA2824522C

公开(公告)日：2016-07-12

申请号：CA2824522

申请日：2012-01-23

Applicant: WEATHERFORD/LAMB INC

Inventor： WILSON TIMOTHY L ,  ODELL ALBERT C II

IPC: E21B34/00 ,  E21B21/10 ,  E21B47/12 ,  E21B47/18

Abstract: A method of drilling a wellbore includes drilling the wellbore by injecting drilling fluid through a drill string extending into the wellbore from surface and rotating a drill bit of the drill string. The drill string further includes a circulation sub having a port closed during drilling. The drilling fluid exits the drill bit and carries cuttings from the drill bit. The drilling fluid and cuttings (returns) flow to the surface via an annulus formed between an outer surface of the tubular string and an inner surface of the wellbore. The method further includes after drilling at least a portion of the wellbore: halting drilling; sending a wireless instruction signal from the surface to a downhole portion of the drill string by articulating the drill string, acoustic signal, or mud pulse, thereby opening the port; and injecting drilling fluid through the drill string and into the annulus via the open port.

公开(公告)号：CA2877369C

公开(公告)日：2017-07-25

申请号：CA2877369

申请日：2013-07-10

Applicant: WEATHERFORD/LAMB INC

Inventor： WILSON TIMOTHY L

IPC: E21B21/10 ,  E21B34/14

Abstract: A method and apparatus for circulating fluid in a wellbore includes a bottom sub 130 having a bottom sub port and a mandrel 35, wherein the mandrel 35 substantially forms an inner bore of the circulating tool and includes a mandrel port. The circulating tool may also include an activation piston 46 that is movable in a first direction and a port piston 64 movable in a second direction when the activation piston 46 moves in the first direction. The circulating tool may further include an inner sleeve 90 coupled to the port piston 64 and movable with the port piston, the inner sleeve 90 having an inner sleeve port in selective communication with the mandrel port. When the inner sleeve port is in communication with the mandrel port at least partially, circulating fluid is allowed to flow through the bottom sub port to the wellbore.

公开(公告)号：CA2858555C

公开(公告)日：2016-09-06

申请号：CA2858555

申请日：2003-10-27

Applicant: WEATHERFORD/LAMB INC

Inventor： BOURGOYNE DARRYL A ,  HANNEGAN DON M ,  BAILEY THOMAS F ,  CHAMBERS JAMES W ,  WILSON TIMOTHY L

IPC: E21B33/038 ,  E21B7/12 ,  E21B21/00 ,  E21B21/08 ,  E21B33/08

Abstract: A system and method provides a holding member for releasably positioning a rotating control head assembly in a subsea housing. The holding member engages an internal formation in the subsea housing to resist movement of the rotating control head assembly relative to the subsea housing. The rotating control head assembly is sealed with the subsea housing when the holding member engages the internal formation. An extendible portion of the holding member assembly extrudes an elastomer between an upper portion and a lower portion of the internal housing to seal the rotating control head assembly with the subsea housing. Pressure relief mechanisms release excess pressure in the subsea housing and a pressure compensation mechanism pressurize bearings in the bearing assembly at a predetermined pressure.