Unlocking Depleted Sandy Reservoir Potential using ESP Improvement in Cinta Field

Abstract

The Cinta Field is one of fields in Offshore South East Sumatera Block which discovered on 1970. The first well development was in 1971 in Talang Akar Formation (TAF) which consist of Zelda and Gita member. Peak production was 70,721 barrel oil per day on Jan, 1977. Initial reservoir pressure was 1488 psi and current reservoir pressure is 500 psi. Nowadays, Cinta field has produced 4,300 barrel oil per day and average water cut 96%. The production challenges in TAF are depleted reservoir pressure that leads to sand and gas production. Artificial lift method applied in Cinta Field is Electric Submersible Pump (ESP). Sand production can create problem in ESP that lead to trip off overload or the worst is shaft broken. Loss of production due to waiting barge to replace the broken ESP will occur. Mechanical sand control has been applied such as gravel pack, expandable sand screen and standalone sand screen to prevent sand produced through ESP. Most of them have failed due to massive sand production. Re-sand control can be alternative solution for this problem, but it can't be done due to low reservoir pressure and most of sand control will lowering productivity index of the wells. Immediate solution of this situation will be improvement of ESP itself. ESP will adapt with sand production situation by improving material and design of pump stages. This paper will present improvement run life of ESP by using new type ESP that is more suitable in sand production situation in Cinta Field.