Wells – Submerged well – Means removably connected to permanent well structure
Reexamination Certificate
2007-09-18
2007-09-18
Beach, Thomas A (Department: 3671)
Wells
Submerged well
Means removably connected to permanent well structure
C166S367000, C166S347000, C175S005000
Reexamination Certificate
active
10191152
ABSTRACT:
A drilling system for drilling subsea wellbores includes a tubing-conveyed drill bit that passes through a subsea wellhead. Surface supplied drilling fluid flows through the tubing, discharges at the drill bit, returns to the wellhead through a wellbore annulus, and flows to the surface via a riser extending from the wellhead. A flow restriction device positioned in the riser restricts the flow of the returning fluid while an active fluid device controllably discharges fluid from a location below to just above the flow restriction device in the riser, thereby controlling bottomhole pressure and equivalent circulating density (“ECD”). Alternatively, the fluid is discharged into a separate return line thereby providing dual gradient drilling while controlling bottomhole pressure and ECD. A controller controls the energy and thus the speed of the pump in response to downhole measurement(s) to maintain the ECD at a predetermined value or within a predetermined range.
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Continuous Circulation Drilling, L. J. Ayling, Maris Int'l Ltd.; J. W. Jenner, Maris Int'l Ltd., H. Elkins, Varco Drilling Dquipment, this paper prepared for presentation at the 2002 Offshore Technology Confrence, Houston, Texas May 6-9, 2002.
Aronstam Peter
Fontana Peter
Watkins Larry
Baker Hughes Incorporated
Beach Thomas A
Madan Mossman & Sriram P.C.
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