This paper presents the plans and accomplishments for Phase IV of the Neptune development; a subsea tieback to the Neptune Spar, located in the Gulf of Mexico in Viosca Knoll Block 825, approximately 135 miles southeast of New Orleans. The water depth at the neptune Spar is approximately 1,930 ft and the subsea wells are to be located approximately four (4) miles west of the Spar in 1,700 ft water depth. The project includes a single subsea tree, a three slot manifold, jumper connections between the tree and manifold, four miles of dual four (4) inch nominal flowlines and electro-hydraulic control umbilical, dual flexible catenary risers and production control equipment. neptune was the first Spar installed in the Gulf of Mexico and this is its first subsea tieback. Innovations associated with this project include the use of a pipeline-end production manifold, flexible catenary risers for the flowlines and an umbilical that combines electrical conductors; thermoplastic hoses and zinc coated carbon steel tubes. It was also the first GOM use of a multiple well manifold without a control pod. Detailed engineering, for the project began in October 1997. Delivery of all of the subsea equipment is scheduled for August 1998. Drilling, completioin and installation should start in august 1998 and first production is sceduled for October 1998.
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