BRACED BIPOD PLATFORM FOR MARGINAL FIELD ALTERNATIVE
Marginal field is relevant topic in current oil and gas industry. It becomes an engineering challenge to find at least one economic solution. This thesis introduces a new type of offshore platform, named “Braced Bipod Platform”, as an alternative solution for minimum offshore platform in water depth...
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| Format: | Theses |
| Language: | Indonesia |
| Online Access: | https://digilib.itb.ac.id/gdl/view/46825 |
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| Institution: | Institut Teknologi Bandung |
| Language: | Indonesia |
| Summary: | Marginal field is relevant topic in current oil and gas industry. It becomes an engineering challenge to find at least one economic solution. This thesis introduces a new type of offshore platform, named “Braced Bipod Platform”, as an alternative solution for minimum offshore platform in water depth of up to 100 m.
Braced Bipod Platform consists of two (2) caissons, two (2) raker piles and one (1) or two (2) sleeves. For water depth up to 60 m, one (1) sleeve is used, while for water depth up to 100 m, two (2) sleeves (upper sleeve and bottom sleeve) are used. Diameter of caisson and raker pile is 56 inch and 36 inch, respectively. Three (3) splitter wells are placed inside the 56 inch caisson, hence there are six (6) splitter wells inside the two (2) caissons. The distance between the caissons is 6 m to avoid pile group effect. Environmental and soil criteria are adjusted to Indonesian seas and soil condition. For comparison purpose, Tripod Jacket Platform has been modeled and analyzed with the same criteria of topside, material, environmental and soil parameter as the Braced Bipod Platform.
Analysis results show that the Braced Bipod Platform in water depths of 60 m and 100 m satisfy the requirement of API RP2A WSD and AISC ASD for In-place, seismic and fatigue conditions. Installation review of Braced Bipod Platform shows that the Platform can be installed for both water depths of 60 m and 100 m. The sub-structure design of Braced Bipod Platform saves up to 20% steel weight and 22% CAPEX (Capital Expenditure) compared to sub-structure of Tripod Jacket which is designed based on the same criteria as Braced Bipod Platform. The Braced Bipod Platform is expected to be an alternative of minimum offshore platform for marginal field development.
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