Abstract
Abstract Medco E&P Indonesia (Medco E&P) operates offshore platform in Natuna Sea. The recent development in Natuna Sea is for marginal field. In case development of marginal field using wellhead platform concept, the challenge in built offshore platform in Natuna sea which has harsh environmental metocean and water depth range from 70 m – 100 m is limitation of crane barge for installation of offshore jacket platform. With metocean criteria and water depth in Natuna Sea, the minimum jacket weight using conventional design is about 1000 ton lifting weight, in 2019 during the Medco E&P Project executed, there is no crane barge with Indonesian flag available in market, the maximum crane barge capacity in Indonesia is 600 MT – 800 MT lift weight. Therefore, Medco E&P team should find substructure new technology for lightweight structure which could be installed by available crane in market to achieve fast track and optimized project cost for marginal field development. The new technology is required to overcome the challenges for marginal field development which requires fast track and low capital project, modular braced monopod has been selected through qualitative and quantitative assessment done amongst 6 lightweight substructure technologies during select phase. Executing project with this new technology, requiring specific project and construction strategy as well as comprehensive assessment on installation procedure and acceptance criteria. The concept of modular braced monopod has benefit in lower offshore lifting weight so require only small crane barge. The jacket consists of several parts which the maximum lifting weight for jacket component is 380 MT only. The modular braced monopod platforms for two fields in Natuna Sea has been installed and operated normally since December 2022, the project has successfully installed 1st modular braced monopod platform in Indonesia with maximum offshore lifting weight around 380 tons only for water depth 79 m compare to non-lightweight structure such as 4-legged platform for similar water depth might requires 2000 – 3000 tons crane barge capacity, the technology has supported for project cost optimization and suitable for tight schedule. The installation of modular braced monopod in the project is the fastest installation compared to other zeepod installation. Area of improvement has been documented and some recommendations for future application to be shared so that allowing better project development for other marginal project. The success story from this project will describe journey in technology selection, risk identification and mitigation, managing interfaces, high standard quality of construction and installation work, as well as providing some lesson learned to organization in executing new technology in offshore platform project.
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