Water Management Strategy in Brown Field, Case Study Prabumulih Field: Plan of Sustainable Development, Cost-Effective Implementation, and Zero Discharge

Abstrak

Water production has been a major operational issue that was closely related to oil production activities. It is one of the most challenging issues in Prabumulih Field that is categorized as Brown Field. The main reason is the difficulty on maintaining oil production by implementing a strategy to reduce water production. Therefore, a comprehensive strategy was needed to be able to implement appropriate water management.

There are several obstacles regarding the implementation of appropriate water management in this case: production facility, budget limitation, fluid properties, subsurface condition, and social problems. Hence, a multidisciplinary team, subsurface and surface, is involved to arrange a comprehensive strategy for solving the issues.

Subsequently, the strategy to overcome water-management issues is divided into four phases: planning, execution, monitoring, and evaluation phase. The planning consists of evaluating the matrix risk, determining of the priority level, making work program (short-term, medium-term, and long-term), setting the target, and determining the person in charge. The execution is conducted based on grouping the work program that has similarities (scope of work and location) and alignment with plan of further  development.Accordingly, monitoring and evaluation are conducted to observe the progress and the accomplishment of the project periodically. This strategy has been implemented since 2018.

According to this case, it discovers that every phase of the strategy has its own level of complexity. The challenge encountered in the planning phase is how to align budget limitations and program priority. Whereas the most challenging phase is the execution phase. Thus, because Prabumulih Field has a large area. Firstly, obstacles related to the social problem must be resolved before work program is executed. The interconnection strategy is conducted to reduce complexity in the execution phase and cost-effectiveness. As a result, it is proved as the best way for operation mapping and reducing costs. Furthermore, the  interconnection strategy also provides a simplification overview for monitoring and evaluating the project’s progress. Besides, it helps immensely to monitor and evaluate based on every interconnection project. Finally, the water management problem begins to be resolved gradually in a more planned manner and is easier to align with Plan of Sustainable Development, as well as the long-term reliability of the zero- discharge program can be assured.