Description:

• Two (2) subsea wells located in Garden Banks 341 providing gas/condensate production to the Shell Auger TLP via two (2) individual 10x6 electrically heated pipe-in-pipe flowlines and two (2) wet-insulated 6” steel catenary risers.
• The dual subsea flowlines tie-back to Auger approximately 11.0 miles away, creating the fourth subsea development to tie-back to Auger.
• Peak production is expected to reach 22,000 barrels of oil/gas condensate and 75 million cubic feet of gas per day.

Technology:

• Installation of a pipe-in-pipe (PIP) flowline system without the use of steel pipe bulkheads. Specialized installation procedures and tooling were utilized allowing the outer casing pipe to slide unimpeded over the inner casing pipe during offshore welding and installation operations.
• Installation of water stop seals and other installation procedures employed to eliminate moisture of any kind entering the PIP flowline annulus during offshore installation operations.
• Electrical testing of every PIP quad joint prior to and subsequent to offshore welding and AUT inspection activities.
• Installation of the world’s first subsea Mid-Line Electrical Connector Assembly for an electrically-heated PIP Flowline System.
• Use of specially designed SCR Installation Mast for SCR transfer operations between the DB50 and the Auger TLP.
  

Scope:

• Installation contract for the construction of two (2) electrically-heated pipe-in-pipe (PIP) flowlines comprised of 6.625” x 0.719” API 5L X70 SMLS carrier pipe and 10.750” x 0.438” API 5L X70 ERW casing pipe. The 6.625” carrier pipe was insulated with 1.3-inch thick jacketed polyurethane foam.
• Flowline construction activities included the installation of two (2) PIP flowline initiation sleds located in 2,000 feet of water using pre-installed suction piles located adjacent to the two (2) subsea wells, and the installation of two (2) 6.625” x 0.844” API 5L X70 SMLS steel catenary risers (SCR’s) located in 2,860 feet of water and insulated with 3.0” of multi-layered Thermotite insulation.
• Installation engineering work was performed by JRM Engineering in Houston, TX. All flowline installation activities were performed by the Derrick Barge No. 50 (DB50) utilizing J-Lay installation methods. All welding work was performed by the JRM Vermatt Bug-N-Band Automatic Welding System (JBBS).

Innovations:

• Subsea Mid-Line Electrical Connector Assembly For
  Hydrate Mitigation
• Purpose-Built SCR Installation Mast Eliminating Need For Drill Rig Assistance During SCR Pull-In Operations