Brown field development management strategy using quadrant analysis (ESP lifting conversion study case)

Abstract

Cepu Field is a brown field consisting of Kawengan Structure, Ledok Structure, Nglobo Structure, Semanggi Structure, Tapen Structure, Dandangilo Structure, Banyuasin Structure which are oil wells and Gundih Group structures which are gas wells. There are total 95 wells with artificial lift in Cepu Field. 69 wells Pumping unit (PU), 16 wells Hydraulic Pumping Unit (HPU), and 10 wells Electrical Submersible Pump (ESP). PU and HPU wells dominate the artificial lifts installed in the Cepu Field, but there are problems that often occur in these wells which result in a low well lifetime. These problems include leaky tubing due to friction caused by the sucker rod, leaky pumps, and loose sucker rods which result in repeated offs in the well. This has an impact on the costs incurred for maintenance of wells and the need for tubing and sucker rods to be replaced. In addition, many wells have low artificial lift performance because they do not match the potential of the well. The evaluation uses quadrant analysis of production performance in the Cepu Field by classifying well problems in order to determine the appropriate work to solve the problems of each well. With the quadrant analysis, the well that have a design mismatch with the artificial lift can be mapped with the potential of the well. The well that is in quadrant II is a suitable candidate for lifting conversion to ESP. In addition, the lifetime of the well is also seen as a reference in determining the candidate wells. ESP conversion has been carried out in the KWG-022TW, KWG-028, KWG-072, and KWG-P08 wells to reduce LPO (Loss Production Opportunity) due to repeated off-well frequencies. This increases the well's lifetime up to three times longer than before, and also reduces well maintenance costs, replacing leaky tubing and oil potential loss due to the well being off. With the success of the conversion in four wells, the authors will evaluate the conversion of lifting to ESP on a field scale, its implementation scenario, economic effects and planning for future field operations.