Evaluation of dry tree platform concepts

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Evaluation of dry tree platform concepts

Huang, E. / Bhat, S. / Luo, Yong / Zou, Jun

Dry completion by means of a surface wellhead platform is a viable alternative to subsea wet completion in all water depths. Dry completion offers the benefits of better reservoir testing and monitoring, drilling and workover capabilities, lower operating costs due to ease of well intervention, better flow assurance, and increased recovery of oil and gas. This paper evaluates a variety of dry tree platform concepts, including both the established Spar and TLP and several newly developed platform concepts, for application in the Gulf of Mexico, offshore West Africa and Brazil. A single column medium draft floater, three and four column extended base TLPs are the new concepts that are included in this paper. A wide range of payloads is considered. Main particulars, global performance characteristics, advantages, and limitations and cost saving features of the new concepts are presented. Using the results from a screening study, trends in the global response, weights and costs are presented and discussed. A map of application domains for the dry tree platform concept is presented on the basis of cost comparisons.