The Guntong field, the largest waterflood field in offshore Peninsular Malaysia, with an oil-in-place of about 200 mstkl, has been producing since 1985. The field contains 13 stacked reservoirs having small gas caps and limited aquifer support. This paper describes some of the significant reservoir, as well as geologic and facility, challenges faced during development and management of this complex reservoir system. A combination of five-spot and peripheral waterflood patterns was selected to provide the required areal coverage with commingling of reservoirs into two operational groups. Several key reservoir management strategies to maximize performance are: determination and application of optimum target reservoir pressures, development and use of a PC based program and other analytical tools to guide production and injection targets, meeting pattern balancing objectives by implementation of comprehensive reservoir surveillance activities and capacity enhancement programs. To date, the response to the reservoir management efforts has been favorable with an all-time high production rate of 14 kstkl/d having been recorded in 1994.
The Guntong field is located in the South China Sea, 210 km off the east coast of Peninsular Malaysia (Figure 1).
