Underwater seafloor drilling rig

E - Fixed Constructions – 21 – B

Patent

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Details

E21B 7/124 (2006.01) E21B 7/12 (2006.01) E21B 7/132 (2006.01) E21B 43/01 (2006.01) E21B 43/013 (2006.01)

Patent

CA 2577749

A subsea drilling system comprises a pressurized drilling capsule that is sealed against the subsea environment and houses equipment for manipulating a drillstring that extends through an opening in the drilling capsule to the exterior of the capsule. A drilling fluid handling assembly is contained within the drilling capsule that communicates drilling fluid through the drillstring and returns the drilling fluid to the water's surface via a drilling fluid conduit. A seafloor unit engages the seafloor and the drilling capsule to position the drilling capsule relative to the seafloor, and includes an opening for passing the drillstring into the seafloor. A pressurized transport unit is movable between the drilling capsule and a support vessel at or near the water's surface for delivering personnel and supplies to the drilling capsule. A method of drilling using the subsea drilling system is achieved by pressurizing a drilling capsule assembly and maintaining the drilling capsule assembly in a pressurized state suitable for human occupancy. The drilling capsule assembly is submerged by altering its buoyancy. The drilling capsule assembly is secured to the formation by drilling a pilot hole in the formation from within the drilling capsule assembly and by inserting a portion of the drilling capsule assembly into the pilot hole. A drillstring is delivered to the drilling capsule assembly, the drillstring including at least one length of 30--foot drillpipe. A bottomhole assembly is made up into the drillstring and rotated from within the drilling capsule to bore a hole in the formation. The drillstring is selectively removed from the hole and the drilling capsule assembly, wherein the drillstring remains assembled and includes at least one length of 30-foot drill pipe.

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