Coiled Tubing Deployed Electrical Submersible Pump (CT-ESP) Application at Offshore Operation

Abstract

T offshore field is located in north-west of Kota Kinabalu, Sabah, Malaysia and has been in operation for 40 years. The major challenges faced by this field are depleted reservoir pressure, gas-lift compressor frequent interruptions and shortage of gaslift supply. Various alternative artificial lift technologies have been evaluated. Electrical Submersible Pump (ESP) was identified to be the most operationally fitting technology to increase production, prolong field life and increase the ultimate recovery. Historically, T field had attempted with downhole hydraulic jet pumps to lift the oil. ESP deployment via coiled tubing (CT-ESP) was deemed the most economical due to rigless intervention and significantly shorter trip times into the well as compared to the time taken to make up conventional jointed tubing. Within 2 years, this technology has successfully contributed over MYR 18 million cost saving from 3 rigless workover and zero Lost Time Injury (LTI). This paper will share the journey and lessons learnt of the project starting from technology assessment, planning to execution phase. The experience gained during this project will be a valuable input in replicating the ESP deployment method for other wells in this platform and for other offshore prospects in term of safety, performance, reliability and cost saving.