New ultra-deepwater rig with dual rotaries will reduce costs

Journal Article · Mon May 26 04:00:00 EDT 1997 · Oil and Gas Journal

OSTI ID:479484

Cole, J C; Herrmann, R P; Scott, R J ^[1]; Shaughnessy, J M ^[2]

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1. Transocean Offshore Inc., Houston, TX (United States)
2. Amoco Corp., Houston, TX (United States)

The Discoverer Enterprise, a next generation, ultra-deepwater drill ship with a dual rotary system, will decrease drilling and completion costs by reducing bottom hole assembly (BHA) and tubular preparation time. Transocean Offshore received a contract from Amoco Corp. to build the ultra-deep floating rig and is scheduled to spud its first well in July 1998. It will generally work in water deeper than 6,000 ft. The rig design involves a new approach that addresses the overall well-construction process and equipment required to decrease significantly deepwater drilling time. The Discoverer is the first ultra-deepwater rig designed specifically for handling subsea completions and extended well tests. The paper discusses increased deepwater rig demand, rig construction costs, drillship design, well construction, development drilling, and cost justification.

• OSTI ID: 479484
• Journal Information: Oil and Gas Journal, Journal Name: Oil and Gas Journal Journal Issue: 21 Vol. 95; ISSN OIGJAV; ISSN 0030-1388
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
42 ENGINEERING
DEPTH 1-3 KM
DESIGN
DRILLING RIGS
OFFSHORE PLATFORMS
OPERATING COST
ROTARY DRILLING
SHIPS
WELL COMPLETION
WELL DRILLING