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ExxonMobil Gawain

Exxon Mobile Gawain

U.K. Block 49/24a

Landmark: Early use of a 13-3/8" drill-through wellhead system

Located in the Southern Sector of the North Sea, the Gawain project was a joint effort between Arco and Mobil. The wells were drilled and completed near a shipping lane, and therefore needed an overtrawlable fishing structure. The wells were drilled and completed with a jackup rig and tied back to the Thames platform with a single 12" flowline approximately 9 miles (15 km) long.

The subsea drilling and completion hardware were completely concentric designs allowing for uninterrupted drilling and completion operations. The tubing hanger incorporated a concentric sliding-sleeve annulus valve and the ability to control the downhole SCSSV.

The project was one of the first EPCI contracts in the North Sea with Brown & Root and E.M.C. as the major joint-venture partners.

  • Three vertical 5"x2" 5,000 psi subsea trees
  • Three subsea control modules
  • Vertical wireline access through annulus valves
  • 13-5/8" 5,000 psi subsea wellhead systems
  • Diver-assist trees
  • External mechanical tree cap
  • PSL-2 FF trim with CRA-protected seal surfaces
  • Electro-hydraulic control system
  • System integration testing, installation assistance, service and maintenance