Method for drilling and completing a subsea well using small dia

Details Method for drilling and completing a subsea well using small dia Method for drilling and completing a subsea well using small dia

1999-02-18

2000-11-07

Taylor, Dennis L.

Wells

Submerged well

Means removably connected to permanent well structure

166351, 166359, 166367, 175 7, 4051951, E21B 712, E21B 7128

Patent

active

061422363

ABSTRACT:
A subsea wellhead assembly located at the sea floor that includes a subsea wellhead and a stationary blowout preventer mounted to the subsea wellhead for controlling a well during drilling. A drill pipe defines an annulus within the stationary blowout preventer. The drill pipe extends to a rotational drive mechanism on a drilling rig at the surface. A drilling head forms a seal against a drill pipe with a rotatable inner portion. The rotatable inner portion rotates with the drill pipe and prevents drilling fluid returns from flowing up the annulus around the drill pipe and prevents drilling fluid returns from discharging onto the seabed. The drilling head is mounted on top of the stationary blowout preventer. A riser extends upward from the drilling head and extends to a floating drilling rig. The riser has a lower end that connects into the drilling head below the drill pipe seal for receiving mud-returns flowing up around the annulus of the drill pipe. The riser is offset from and parallel to the drill pipe. After drilling, the riser is used to complete the well.

REFERENCES:
patent: 3603409 (1971-09-01), Watkins
patent: 4063602 (1977-12-01), Howell et al.
patent: 4091881 (1978-05-01), Maus
patent: 4149603 (1979-04-01), Arnold
patent: 4466487 (1984-08-01), Taylor
patent: 4813495 (1989-03-01), Leach
Dec. 1997, "Riserless Drilling"Publication by Allen D. Gault.

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