Technology for Developing Marginal Offshore Oilfields
The idea for this review of the technology for developing marginal offshore oilfieldsarose out of a report which we were commissioned to undertake for the Irish Departmentof Energy in October 1984. The Department were looking for information on thedifferent options for developing small oil accumulations in the exposed Irish offshorearea, what systems were currently available, what new developments were likely in thenext decade and the approximate cost of developing various sizes of reservoir using thesesystems.While compiling the report we discovered that, while all the literature and industryspokesmen agreed on the importance of marginal field technology, there was nopublication which addressed the topic in any comprehensive fashion, with the possibleexception of studies costing several thousands of dollars or confidential oil company inhousereports. This review aims to cover this very broad topic in a way which isintelligible to a general technical reader. It is not possible to cover detailed design aspectsof the various systems described here in a book of this size. References and abibliography covering the topics discussed in each chapter are provided for thoseinterested in pursuing the various subjects in more detail.
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1 The Challenge of Marginal Fields
2 Elements of a Marginal Field Development Scheme
3 Existing Marginal Field Technology
4 Current and Future Marginal Field Development Concepts
5 Construction and Operating History of North Sea Floating Production Systems
6 Marginal Field Economics and Costs
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Argyll field articulated column barge bn m3 Britoil buoy buoyancy CALM buoy Campos Basin catenary concept connected Conoco costs crude oil deck diameter drill rig dynamic positioning early production system Environmental conditions environments equipment Export details extended well test fixed platform flare flexible riser floating hose flowlines fluid Frigg Frigg field gas lift gas/oil ratio hydraulic installed jack-up located maintenance marginal field development mmscfd mn barrels mooring system North Sea offloading Operator pipe pipeline pressure production facility production platform Production rate production riser production support recoverable reserves recovery Reservoir characteristics rigid riser Riser data riser system Riser type SALM satellite scf/bbl sea bed Sedco semi-submersible shuttle tanker Statoil steel structure subsea manifold subsea production system Support data swivel tanks template tension leg platform thickness of reservoir tonnes tower universal joint utilised valves vessel water depths water injection wellhead