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), Journal Name: J. Pet. Technol.; (United States) Vol. 39:2; ISSN JPTJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
ANISOTROPY
ATLANTIC OCEAN
BOUNDARY CONDITIONS
COMPUTERIZED SIMULATION
ENERGY SOURCES
ENHANCED RECOVERY
EUROPE
FLUID INJECTION
FOSSIL FUELS
FRACTURED RESERVOIRS
FUELS
GEOLOGIC DEPOSITS
MATHEMATICAL MODELS
MINERAL RESOURCES
NORTH SEA
NORWAY
OIL FIELDS
OIL WELLS
PERFORMANCE
PERMEABILITY
PETROLEUM
PETROLEUM DEPOSITS
POROSITY
RECOVERY
RESERVOIR PRESSURE
RESOURCES
SCANDINAVIA
SEAS
SIMULATION
STIMULATION
SURFACE WATERS
SWEEP EFFICIENCY
THREE-DIMENSIONAL CALCULATIONS
TIME DEPENDENCE
WATERFLOODING
WELL PRESSURE
WELL STIMULATION
WELLS
WESTERN EUROPE