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Sloss COFCAW project--further evaluation of performance during and after air injection

Conference · · Soc. Pet. Eng. AIME, Pap.; (United States)
OSTI ID:6812959
;
A COFCAW (Combination of Forward Combustion and Waterflooding) project was conducted in 960 acres of the Sloss field, Kimball County, Nebraska, from early 1963 until July 1971. In July 1971, air injection was terminated with water injection being continued. Significant volumes of oil banked up by the COFCAW operations have been produced as a result of continued water injection. Performance of the field following termination of air injection is discussed. In addition, data obtained from 5 core holes drilled within a single quadrant of one of the 5-spot patterns are presented. These data indicate that (1) burning took place in the more permeable top part of the pay; (2) the average vertical sweep of the heated zone (> 350/sup 0/F) was about 28%; (3) the areal sweep of the heated zone was about 50%; (4) the residual oil saturation in this zone was about 6%; and (5) anhydrite precipitation took place in some of the pore space of the rock subjected to high temperature. The core data and water drive performance, after terminating air injection, suggest modifications in future COFCAW operations. These modifications are discussed.
Research Organization:
Amoco Production Co.
OSTI ID:
6812959
Conference Information:
Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Journal Volume: 4766
Country of Publication:
United States
Language:
English

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Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
AIR
CHEMICAL REACTIONS
COMBUSTION
COMPARATIVE EVALUATIONS
ENERGY SOURCES
ENHANCED RECOVERY
FEDERAL REGION VII
FLUID INJECTION
FLUIDS
FOSSIL FUELS
FUELS
GASES
GEOLOGIC DEPOSITS
IN-SITU COMBUSTION
IN-SITU PROCESSING
MINERAL RESOURCES
NEBRASKA
NORTH AMERICA
OIL FIELDS
OIL WELLS
OXIDATION
PERFORMANCE
PETROLEUM
PETROLEUM DEPOSITS
PROCESSING
RECOVERY
RESOURCES
STIMULATION
THERMAL RECOVERY
THERMOCHEMICAL PROCESSES
USA
WATERFLOODING
WELL STIMULATION
WELLS