GUNTONG FIELD - DEVELOPMENT AND MANAGEMENT OF A MULTIPLE RESERVOIR OFFSHORE WATERFLOOD

The Guntong field, the largest waterflood field in offshore peninsular Malaysia, with an oil-in-place (OIP) of about 200 million m(3), has b een producing since 1985. The field contains 13 stacked reservoirs wit h small gas caps and limited aquifer support. This paper describes som e of the significant reservoir, geologic, and facility challenges face d during development and management of this complex reservoir system. A combination of five-spot and peripheral waterflood patterns was sele cted to provide the required areal coverage, and reservoirs were commi ngled into two operational groups. Key reservoir management strategies to maximize performance include determination of optimum target reser voir pressures, use of a PC-based program to guide production and inje ction targets, and meeting pattern-balancing and capacity-enhancement programs. The response to the reservoir management efforts has been fa vorable, with an all-time-high production rate of 14 000 m(3)/d record ed in 1994.