Abstract

PETRONAS Carigali Sdn. Bhd. (PCSB) operates a handful of small platforms at offshore Peninsular Malaysia, in the Malay Basin area, located in the South China Sea. Most of these platforms were designed with limited crane capacity of maximum 5 MT load and small deck space area that only suffice to accommodate slickline operations. After many years of production, the fields have started experiencing sand production, high water cut and a large skin factor. Thus, well interventions and treatments such as matrix stimulation, water shut off or sand clean out are required to sustain and enhance the production rate.

Coil tubing (CT) well intervention is the most effective method to achieve these objectives. However, with limited platform facilities, it is a tremendous challenge to have big CT equipments catered on board. The solution to this is to have a minimal number of equipments on the main deck whilst the crane lifting will need to be done from the barge. CT operation with barge assistance was evaluated and finally opted for to execute the jobs at PCSB's small fields. Throughout the operation, only the coil tubing injector head, jacking frame and CT control cabin were erected on the platform whilst the remaining equipments were stationed on the barge.

As this was the first CT barge assisted operation in the Malay Basin of South China Sea, two platforms were selected for the pilot campaign. The jobs objectives include water shut-off, wax and sand clean out that has a potential enhancement of 1000 bbl of crude. This paper describes the operational success stories, campaign preparation, proposed work programs, barge selection, jobs execution and project lessons learned.

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