Jack Up Rig Selection for Multi-environment Offshore Drilling in East Kalimantan and Attaka

Abstract

East Kalimantan and Attaka is a mature oil and gas blocks located in offshore East Kalimantan, Indonesia covering vast geographical area with vary water depth ranging from 14 feet as the shallowest and more than 1,000 feet as the deepest. The original concept of field development utilizes Tender Assisted Rig (TAD Rig) for development drilling with fixed platforms specifically designed specifically for TAD Rig operation. An initiative to utilize a Jack Up Rig (JU Rig) was taken as a smaller satellite platform was built to develop marginal reserve in deeper water depth.

Pertamina Hulu Kalimantan Timur (PHKT) as current operator commenced a continuous drilling campaign started at 2020 as a future development program of the asset. With current challenging industry environment, operating two type of mobile offshore drilling unit (MODU) as previous modus operandi was not a wise option. A process was implemented to select an appropriate MODU type. The evaluation was lead to the selection of a suitable JU Rig for all platform environment in East Kalimantan and Attaka with capability for operation in wide range of water depth as the main criteria. The selection method was based on geo-hazard identification and assessment with the priority to ensure safe operation and avoid catastrophic accident, which can lead to loss off asset, personnel safety, and environmental damage.

This paper describe the procedure in selecting a proper JU Rig that meet the requirement of multienvironment platform in East Kalimantan and Attaka. This initiative has been successful to provide optimization in drilling operation and cost efficiency for the company. Despite all the challenges encountered during execution, the operation was successful in safe manner without any incident.