Abstract: El Furrial Field Miscible Gas and Water Injection Enhanced Oil Recovery Project
Pizarro J. Herbas, L. Diamond, T. Pedroza, M. Todd, R. Smith, I. Roberts
El Furrial field in the North of Monagas state was discovered in 1987, and originally contained approximately 6.9 million stock tank barrels of oil in place. The principal operator, Lagoven S.A., has devoted intensive engineering studies to define the optimum exploitation strategy and maximize final recovery.
As a result of these studies, production mechanisms were early identified and a reservoir pressure maintenance program was defined to increase the recovery factor and maintain production rates. Simultaneously with the implementation of a 450,000 barrels of water per day waterflood project, engineering studies were continued to determine the feasibility of a gas injection alternative to complement the water injection program.
Those studies demonstrated that a higly efficient miscible displacement could be attained by injecting dry gas at current operational reservoir conditions (6500 psi and 280°F). Consequently, extensive laboratory work, geostatistical and deterministic reservoir description, and black oil miscible and compositional simulation were performed to define a miscible gas injection implementation plan. As a result it was concluded that major increase in reserves could be obtained by injection of all the produced gas in the field plus some make up gas, together with an expansion of the waterflood.
In this paper the methodology, procedures and results of this interdisciplinary effort will be described.
AAPG Search and Discovery Article #90951©1996 AAPG International Conference and Exhibition, Caracas, Venezuela