First Application of Micro Coiled Tubing in Indonesia at Offshore Mahakam

Abstract

In order to answer the future challenges associated with offshore logistics, minimalist platform and job simplicity, smaller footprint of coiled tubing set is required for pumping job. Although coiled tubing (CT) is one of the most efficient deployment method for multiple wellsite operations and various objectives. Often it is difficult to capture all the benefits of its application in some offshore wells. Limited crane capacity and deck space at the platform often provide challenges to efficiently execute a CT operation. Minimalist and crowded platforms may not allow conducive condition to set up a conventional CT system. As part of continuous improvement in Well Intervention, smaller size of CT called Micro CT is deployed to unload the completion fluid using nitrogen pumping. This is to provide sufficient drawdown prior to clean up or perforation jobs. Micro CT is a small coiled tubing typically with 1" outside diameter and 10,000 ft length. It is approximately half the weight and a third smaller compared to the conventional CT. The start-up project of 1st Micro CT job in Indonesia is commenced with unloading Job in Bekapai and South Mahakam wells. Five (5) unloading job are successfully performed within allocated time frame and budget. There were no major safety issues recorded. Total of 60% cost saving was generated from the reduced mobilization trips of supply boat while 40% cost saving is from improved diesel consumption efficiency. From operational aspect, less annular friction can be achieved and led save up to 35% in N2 consumption. Moreover, it saves10 – 20% rig up time in comparison to conventional CT. On top of that, those 5 unloading jobs was completed with liquid unloading efficiency of more than 70% from the target. This paper will elaborate the experience of an Asset Operator in deploying 1st Micro CT application safely and will discuss in detail some of the measurable milestone achievement from the project.