Decision Analysis for Bumi Hitam Field Development by Using Analytical Hierarchy Process (AHP): Case Study of Pt Pertamina Ep

Abstract

Zone 7 continues to decline. The achievement of gas production for PEP Zone 7 is only 94%. The gas balance shows that the gas supply from PEP Zone 7 cannot keep up with gas demand from consumers. PEP Zone 7, through the Subsurface Development Department, conducted a study on potential structures to increase gas production and supply capability. One of them is the Bumi Hitam Complex, consisting of the Bumi Hitam Structure and Cililin Selatan Structure. The estimated recoverable reserve is about 24 BSCF and 150 MBO. This comes from one workover, two infill well drilling, and two step-out drilling activities. The current issue is how to handle the produced fluid. The VFT (Value Focused Thinking) approach is used to resolve the problem. It generates three scenarios:

• Build a new gathering station and transport the fluid to compressor suction,
• Transport gross fluid to GS CLU, 
• Build a new gathering station, and transport the fluid to compressor discharge.

Those scenarios consider cost, hydrocarbon recovery, net present value, and operability. Analytical Hierarchy Process (AHP) is used to find the best solution. Four subject matter experts (SMEs) conducted FGD (Focused Group Discussion) to assess each scenario considering those criteria. It generates a scenario to build a new gathering station and transport the fluid to compressor suction as the best scenario, with the value reaching 59.3%. The consistency ratio is also valid with the value of 0.07 (the valid value requirement is less than 0.1).