The Duri Steamflood (DSF) Project is the largest thermal enhanced oil recovery (EOR) project in the world, surpassing in production both the Kern River and Belridge Fields in the San Joaquin valley of California. The field is located in Riau Province, on the island of Sumatra, in Indonesia. Duri is the second largest field in the country, producing nearly 200,000 BOPD of steamflood production. The field is operated and developed by P.T. Caltex Pacific Indonesia (CPI), a production sharing contractor to Pertamina, the Indonesian national oil company.
The DSF Project will develop over 15,000 acres of reservoir utilizing over 4,000 producing wells. At present, only about one third of the field is under active steamflood. The DSF Project is divided into twelve development units called Areas. New Areas are about 1,400 acres in size, and are developed, that is, drilled and put on injection, in about 1-3/4 to two years.
The steamflood development involves the use of symmetric patterns of varying size and configuration. Inverted seven spots, approximately 11-5/8 acres in size have been the principal pattern configuration for Area development, including the Area currently being drilled *. For future Areas, inverted five and nine spots, approximately 15-1/2 acres in size are planned. This change has been implemented as a result of detailed reservoir simulation studies conducted in CPI [2,3].
The Duri Steamflood Project is unique in that it simultaneously involves the management of existing steamflood Areas, the development of new steamflood Areas, and the design of future Areas to maximize both oil recovery and production efficiency. The balancing of these three objectives is both a complex and vitally important project management task. The approach taken by CPI is a multi-disciplinary one involving development geology, petroleum engineering, and surface facility engineering. Improvements in well stimulation techniques, well completions, flood monitoring and flood design have been realized.