Method for handling wellhead assembly

Patent · Tue Apr 21 04:00:00 EDT 1987

OSTI ID:6570885

Tateishi, H

A method is described of handling an underwater assembly by an offshore jack-up drilling rig having a plurality of legs and a cantilever working deck slidably mounted on a platform thereof comprising steps of: (a) lowering down the legs to the ocean floor at a position adjacent to a template provided on shore, lifting up the jack-up drilling rig above the surface of a body of water, extending the cantilever working deck from the rig to over the template provided on the shore; (b) mounting the template on the underside of the cantilever working deck and returning the working deck together with the template back to the original position within the jack-up drilling rig; (c) lifting up the legs from the surface of a body of water and towing the rig to a preselected drilling position; (d) lowering down the legs from the rig to on the ocean floor and lifting up the platform above the surface of a body of water; (e) extending the cantilever working deck together with the template from the platform to over the surface of a body of water; and (f) lowering down the template to on the ocean floor.

• Assignee: Mitsui Ocean Development and Engineering Co. Ltd., Tokyo
• Patent Number(s): US 4658903
• OSTI ID: 6570885
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030300 -- Natural Gas-- Drilling
Production
& Processing
42 ENGINEERING
420206 -- Engineering-- Mining & Drilling Equipment & Facilities-- (1980-1989)
423000 -- Engineering-- Marine Engineering-- (1980-)
DRILLING
DRILLING RIGS
EQUIPMENT
HOISTING
HOISTS
MATERIALS HANDLING
MATERIALS HANDLING EQUIPMENT
MOORINGS
NATURAL GAS WELLS
OFFSHORE DRILLING
OFFSHORE PLATFORMS
OIL WELLS
POSITIONING
SEA BED
UNDERWATER OPERATIONS
WELLHEADS
WELLS