Gulf of Mexico Block GC 60

Landmark: FMC Technologies’ First Electro-Hydraulic Control System in Gulf of Mexico

Project Overview

• Contract Award: 1995
• Sales: Houston, Texas
• Fabrication: Houston, Texas
• Service Base: Houston, Texas
• Host Type: Platform
• Contract Type: EPC

Project Characteristics

• No. Trees: 2
• Water Depth: 265 m (870 ft)
• Tree Type: Vertical
• Tree Pressure: 5,000 psi
• Tree Bore Size: 3"x2"
• Hydrocarbon: Oil

Project Ownership

• ExxonMobil 55%
• BHP Billiton 45%

Scope of Work

• Two (2) vertical 3"x2" 5,000 psi subsea trees with tubing heads
• One (1) three-slot production manifold (two slots utilized, one slot spare)
• Electro-hydraulic (EH) production control system
• Subsea control modules for each tree
• Topside production control system MCS, HPU and EPU on the GC 18-A platform
• Hydraulic and electric flying leads and mating inboard connectors on trees, manifold and UTH for subsea controls distribution
• 3" ROV-operated gate valve for gas-lift isolation on the UTH
• Direct hydraulic Installation Workover Control Systems (IWOCS) and tree running tools (rental)
• System integration testing, offshore installation support and technical assistance

Comments

Mobil E&P developed the Green Canyon 60 Field located 160 km (100 miles) offshore Louisiana in a water depth of 265 m (870 ft). The development consists of a subsea template tied back to the Mobil GC 18-A production platform. Yukon was the first project in the Gulf of Mexico to utilize an electro-hydraulic control system supplied by FMC.

The flowline gathering system for the oil/gas well fluid consists of two (2) 6" pipelines each 13 km (7.7 miles) in length. The flowlines are connected to the GC 18-A platform by means of steel catenary risers (SCRs). Rigid spool pieces with ADS-assist swivel flanges are used to connect the flowlines to the subsea manifold. Hydraulic controls, chemical injection and electrical power are supplied to the subsea template from GC 18-A by means of an integrated service umbilical, which also contains a 3" steel pipeline for gas lift.