This paper is to highlight the success offshore installation campaign of D28JT-A and D18JT-D platforms utilizing Jack-Up Rig (JUR) and the technical challenges during offshore execution. The installation work limitations and difference in installation sequence are also presented in this document. Light Weight Structure (LWS) has become one of the novel alternatives and cost-effective solutions for marginal field offshore facility in the recent years in meeting tight budget for Final Investment Decision (FID).

The basic concept of LWS is to design the topside and substructure that could be lifted by JUR for installation. Hence, a minimal facility design approach was selected for this project due to limited capability of the selected JUR. While the basic principle of load out and transportation remains the same, methodology and systems used to execute the offshore installation campaign are vary significantly. This concept has posed numerous technical and operational challenges.

PETRONAS Carigali Sdn. Bhd. (PCSB) has undertaken the development of D28JT-A and alliance with partner for D18JT-D development. Both projects are located at offshore Sarawak in Malaysia. D28JT-A and D18JT-D are wellhead platforms utilizing design one and built many concepts where both platforms were similar in design with only difference in weight. Both platforms were installed by the same JUR.

The installation work required high precision engineering and execution especially during topside lifting considering the close proximity (≪ 1 meters) between substructure and topside. Position Monitoring System and Weather Monitoring System were essential and closely monitored for safe work execution. Transportation marine vessel dynamic positioning (DP) system checks were conducted prior approaching the substructure. Both Topsides were lifted and set down within 3.25 hours. These projects had successful HSSE track record with zero LTI or incident.

It is proven that the installation of light weight structure by JUR is technically feasible and become a benchmark for future projects especially for marginal field development. Utilization of JUR for offshore platform installation significantly reduce the offshore installation cost due to JUR daily charted rate (DCR) and sharing mobilization and demobilization of installation and drilling campaigns.

This paper should be an interest for marginal field development utilizing "fit-for-purpose" design facilities.

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