Combination offshore drilling rig

Patent · Tue Jul 29 04:00:00 EDT 1986

OSTI ID:5443158

Lorenz, D B; Laid, II, J S

An offshore drilling rig is described for use in drilling into a formation below a body of water comprising a barge hull having a drilling slot extending inwardly from the peripheral boundary of the barge hull, means for supporting the barge hull in a position above the water, a cantilever structure mounted on the barge hull and movable horizontally with respect to such barge hull, the cantilever structure being so located relative to the drilling slot as to be movable horizontally into a position in vertical alignment with the drilling slot, a derrick and drilling machinery mounted to the cantilever structure and movable into a position above the drilling slot whereby well drilling operations may be conducted through the drilling slot, the cantilever structure also being movable horizontally to a position which locates the derrick and the drilling machinery outboard of the peripheral boundary of the barge hull, whereby a drilling operations may be conducted outside of the peripheral boundary of the barge hull, means mounted on the barge hull for moving the cantilever structure horizontally to different positions relative to the barge hull.

• Assignee: Marathon Manufacturing Co., Houston, TX
• Patent Number(s): US 4602894
• OSTI ID: 5443158
• 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-)
ANCHORS
DESIGN
DRILLING
DRILLING EQUIPMENT
DRILLING RIGS
EQUIPMENT
MECHANICAL STRUCTURES
NATURAL GAS WELLS
OFFSHORE DRILLING
OFFSHORE PLATFORMS
OIL WELLS
POSITIONING
SUPPORTS
WELLS