Subsea Tieback to Fixed Platform Gulf of Mexico


Location:  Gulf of Mexico, USA

Services:  FEED / Detailed Engineering / Project Scheduling & Controls

EDG Scope of Work:  Project Management / Procurement / Detailed Engineering & Design

SSTB to Fixed Platform Gulf of Mexico

Project Overview

The field development included a 26-mile subsea tieback from two (2) subsea trees to an existing 4-pile production platform. All new subsea infrastructure, including a single production flowline and power/controls/hydraulic umbilical, were required. Additionally, the existing process facilities at the 4-pile platform were undersized for the development’s design flowrate and higher GOR. Necessary additions to the 4-pile platform included a new flowline system (BSDV and flowline heater), a dedicated HP Separator, a new crude oil heater and VRU, and a substantial new chemical injection system. Existing process and utility support systems also required modification to increase platform nameplate capacity and utility systems efficiency.  A custom power system expansion was required to power the new platform loads. Since space was severely constrained on the 4-pile platform, several new mezzanines and deck extensions were required to fit the new equipment. Additionally, the execution required a temporary construction camp and installation crane for which EDG completed planning and structural engineering.

EDG assembled a multi-discipline team that included team members from Project Management, Topsides Facilities/Process/Electrical/Controls/Structural Engineering and Drafting/Design, Cost Estimating, Procurement, Document Control, and Project Controls through FEED and Detailed Engineering. EDG also subcontracted and coordinated laser scanning of the entire topsides facility. The laser scan data was then leveraged to limit site survey time and ensure design accuracy.

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