Ekofisk waterflood pilot
This paper describes the evaluation of a waterflood pilot in the highly fractured Maastrichtian reservoir of the Ekofisk field in the Norwegian sector of the North Sea. A four-well pilot consisting of one water injector and three producers was initiated in Spring 1981 and was concluded in mid-1984. A total of 21 x 10/sup 6/ bbl(3.3 x 10/sup 6/ m/sup 3/) of water was injected, and water breakthrough occurred in two of the production wells. Simulation of waterflood performance in the pilot was conducted with a three-dimensional (3D), three-phase dual-porosity model. Initial and boundary conditions were taken from a full 3D single-porosity model of the reservoir. The pilot was conducted to determine the following information for the Maastrichtian: water-cut performance vs. time, water imbibition characteristics, and anisotropy. Results from this work have been incorporated into a full-field waterflood study. Reservoir description included the determination of fractured areas, matrix block sizes, water/oil capillary imbibition, matrix permeability and porosity, and effective permeability. These data were derived from fracture core analysis, pressure transient tests, laboratory water/oil imbibition studies, repeat formation pressure test results, and open- and cased-hole logs. An excellent match of waterflood performance was obtained with the dual-porosity model. Of particular interest are the imbibition characteristics of the Maastrichtian in the Ekofisk field and the character of the water-cut performance of the producing wells following injector shutdowns and startups.
- Research Organization:
- Phillips Petroleum Co.
- OSTI ID:
- 6680418
- Journal Information:
- J. Pet. Technol.; (United States), Vol. 39:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
NORTH SEA
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OIL WELLS
WATERFLOODING
COMPUTERIZED SIMULATION
SWEEP EFFICIENCY
ANISOTROPY
BOUNDARY CONDITIONS
ENHANCED RECOVERY
FRACTURED RESERVOIRS
MATHEMATICAL MODELS
NORWAY
PERFORMANCE
PERMEABILITY
PETROLEUM
POROSITY
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
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ENERGY SOURCES
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FLUID INJECTION
FOSSIL FUELS
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GEOLOGIC DEPOSITS
MINERAL RESOURCES
PETROLEUM DEPOSITS
RECOVERY
RESERVOIR PRESSURE
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SCANDINAVIA
SEAS
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WESTERN EUROPE
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