Multi Zone Single Trip Gravel Pack System Deployed on Hydraulic Workover Unit: Holistic Approach to Optimize Drilling and Completion Cost in the Mahakam Delta

Abstract

The Multi Zone Single Trip Gravel Pack (MZSTGP) system has been proven as the main solution for developing shallow reservoirs and overcoming sand production issues in marginal sand prone wells in the Mahakam Delta, Indonesia. Robust operating procedures and completion equipments have been developed to assure safe and efficient operations through conventional swamp or jack up rig operations since 2006. Due to marginal reserves being available and the high cost of conventional rig utilization to perform MZSTGP completion, Pertamina Hulu Mahakam initiated completion of the well using a rigless technique to install gravel pack completion with Hydraulic Workover Unit (HWU). This alternative solution is the main driving factor as a new frontier of MZSTGP rigless operation and enables the delivery of typical marginal wells economically at the Mahakam Delta swamp area. This has resulted in potential significant well cost saving up to 37% compared to conventional rig cost, or approximately equivalent to half a million USD along the completion phase. Post rigless gravel pack operation, production stabilized at expected rate and the well has no restrictions to keep producing at this rate or even higher. This new frontier solution of MZSTP rigless operation can be considered as the first successful rigless 7” MZSTGP installation at swamp areas worldwide with no NPT and safety issue.