Waterflood Planning and Implementation in Kenali Asam Field, Indonesia
Titaley, Grace S.1; Yugantoro, Yudi; and Budiyono, Budiyono
Kenali Asam field lying on Jambi sub basin-South Sumatra Basin with current daily production (in December 2010) was reaching 1500 bopd with 94% of watercut in average. From 286 wells available, only 100 wells actively produce oil, with some wells categorize as dry hole and the rest were suspended and abandoned. Production zones are sandstone from Air Benakat Formation, deposited in shallow marine and giving a good quality of reservoir.
Majority of oil and gas field in Indonesia are mature fields which have reached its primary production phase. In order to increase their oil recovery and inline to Pertamina’s mission and high demand to increase national oil production, secondary recovery and EOR technologies begin to apply here by conducting a good screening, engineering, planning, surveillance and development processes. Based on those processes, Kenali Asam was selected as a candidate fields for further development by implementing secondary recovery method: Waterflooding.
Pertamina applies waterflooding at Kenali Asam in some stages. In 1993, Pertamina has started injected water peripherally to increase reservoir pressure and to manage production water. In 2007, integrated reservoir study was conducted to evaluate the result and to plan the next steps preparing Kenali Asam for Waterflooding project. Subsurface data include geology, reservoir, and production was comprehensively studied to get better understanding of reservoir distribution, reservoir continuity, and also complexity of faults and compartments. Using the result of this study, 3D reservoir model (static and dynamic) was built and waterflooding design (including injection pattern) was created. After completing the integrated reservoir study, the next stage was preparing pilot waterflooding project for Kenali Asam. Surface facilities, infra structure, land and spatial related problems were then mapped before and during the pilot project. Those efforts should be evaluated periodically to minimize the obstacles. Once pilot project completed, the Plan of Development for Waterflooding Project in Kenali Asam should be generated.
From Waterflood planning and implementation in Kenali Asam, Pertamina learn the lesson that in planning waterflooding project needs not only strong subsurface evaluation and reservoir study, but also an integrated and comprehensive management with surface and support team so it can be implemented as model for other mature fields in Pertamina Own Operation.
AAPG Search and Discovery Article #90166©2013 AAPG International Conference & Exhibition, Cartagena, Colombia, 8-11 September 2013