A completion design for high-capacity offshore gas wells
Sarawak Shell Bhd. (SSB) is currently developing two offshore gas fields to supply about 1,200 MMscf/D (34.3 x 10/sup 6/ std m/sup 3//d) to a liquid natural gas (LNG) plant being built at Bintulu, Sarawak. Both fields are carbonate buildups with very high productivities but, because of their relatively shallow depth, only moderate reservoir pressure. The produced gas is lean, with CO/sub 2/ content of up to 7.3% and H/sub 2/S content of about 8 ppm. Because the wells are offshore, there is increased risk caused by the proximity of other wells and the possibility of platform damage. Being offshore also means high costs for drilling, compression, and workover. This paper discusses the completion design developed to cope with these conditions. Safety considerations, the prevention of corrosion, and tubing stress analysis are discussed. The final design uses 7-in. (17.8-cm) tubulars, including 13% Cr steel at points where corrosion may be severe, and uses a fire-resistant Christmas tree and wellhead design.
- Research Organization:
- Koninklijke/Shell Exploratie en Produktie Laboratorium
- OSTI ID:
- 6018843
- Journal Information:
- J. Pet. Technol.; (United States), Vol. 35:4
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NATURAL GAS WELLS
CORROSION PROTECTION
OFFSHORE OPERATIONS
PRODUCTION
WELL COMPLETION
DESIGN
CARBON DIOXIDE
CARBONATE ROCKS
CHEMICAL COMPOSITION
CHROMIUM STEELS
ENERGY SOURCE DEVELOPMENT
FIRE RESISTANCE
GAS YIELDS
HYDROGEN SULFIDES
INDONESIA
LNG PLANTS
NATURAL GAS DEPOSITS
OFFSHORE PLATFORMS
PRODUCTIVITY
RESERVOIR PRESSURE
RESERVOIR ROCK
STRESS ANALYSIS
TECHNOLOGY ASSESSMENT
WELL SPACING
ALLOYS
ASIA
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHROMIUM ALLOYS
DEVELOPING COUNTRIES
GEOLOGIC DEPOSITS
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
ISLANDS
MINERAL RESOURCES
OXIDES
OXYGEN COMPOUNDS
RESOURCES
ROCKS
SEDIMENTARY ROCKS
STEELS
SULFIDES
SULFUR COMPOUNDS
WELLS
YIELDS
030300* - Natural Gas- Drilling
Production
& Processing