Wellhead innovations for hot, high pressure wells
Mobile Oil Indonesia's Arun wells produce gas at rates up to 150 MMSCFD. The gas contains 14% CO/sub 2/, and up to 100 ppm H/sub 2/S. The flowing wellhead temperature is ca 325 F. The original shut-in surface pressure was 5800 psi. Failure of the resilient wellhead casing seals occurred in ca 40% of the wells. This was attributed primarily to the effects of high flowing wellhead temperatures, and to temperature cycling between flowing and shut-in conditions. Mobile Oil Indonesia (MOI) decided a metal-to-metal seal, between the 9-5/8-in. casing long string and wellhead, was required to insure a long-term effective wellhead seal for Arun producing conditions. Wellhead metal-to-metal seals of the size and type required for 9-5/8-in. casing did not exist anywhere in the industry. MOI worked with the manufacturers of the wellheads used in Arun who designed, tested and manufactured metal-to-metal wellhead seals. Special tools were developed to field machine the casing so that an effective metal-to-metal seal is obtained between the casing and the wellhead.
- OSTI ID:
- 5690448
- Report Number(s):
- CONF-8202101-
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE-10460; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030300* -- Natural Gas-- Drilling
Production
& Processing
ASIA
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CHALCOGENIDES
DESIGN
DEVELOPING COUNTRIES
ENERGY SOURCES
FAILURES
FLUIDS
FOSSIL FUELS
FUEL GAS
FUELS
GAS FUELS
GASES
HIGH PRESSURE
HIGH TEMPERATURE
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDONESIA
ISLANDS
NATURAL GAS
NATURAL GAS WELLS
OXIDES
OXYGEN COMPOUNDS
RESERVOIR PRESSURE
RESERVOIR TEMPERATURE
SEALS
SULFIDES
SULFUR COMPOUNDS
TOOLS
WELL COMPLETION
WELLHEADS
WELLS