E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 21/08 (2006.01) E21B 17/00 (2006.01) E21B 17/01 (2006.01) E21B 17/042 (2006.01) E21B 33/14 (2006.01) E21B 43/10 (2006.01) E21B 43/34 (2006.01) E21B 44/00 (2006.01) E21B 47/06 (2006.01) E21B 47/12 (2006.01)
Patent
CA 2600602
In one embodiment, a method for drilling a wellbore includes an act of drilling the wellbore by injecting drilling fluid through a tubular string disposed in the wellbore, the tubular string comprising a drill bit disposed on a bottom thereof. The drilling fluid exits the drill bit and carries cuttings from the drill bit. The drilling fluid and cuttings (returns) flow to a surface of the wellbore via an annulus defined by an outer surface of the tubular string and an inner surface of the wellbore. The method further includes an act performed while drilling the wellbore of measuring a first annulus pressure (FAP) using a pressure sensor attached to a casing string hung from a wellhead of the wellbore. The method further includes an act performed while drilling the wellbore of controlling a second annulus pressure (SAP) exerted on a formation exposed to the annulus.
Belcher Gary
Brunnert David
Harrall Simon
Nott Darcy
Schmigel Kevin
Deeth Williams Wall Llp
Weatherford/lamb Inc.
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