|
Client
|
Shell Offshore, Inc.
|
|
Region
|
Gulf of Mexico
|
|
Location
|
Mississippi Canyon 764 - Mississippi Canyon 807
|
|
Water Depth
|
3300 ft.
|
|
Pipeline(s)
|
- 10" x 3 mi. dual pipelines
- 12" x 3 mi. dual pipeline end sleds
|
|
Services Performed
|
Subsea, Pipelines
|
| Contractor |
J. Ray McDermott,
Inc. |
| Sub-Contractor |
Mentor Subsea
Technology Services |
| Award |
February, 1999 |
| Completion |
December, 1999 |
| Project
Manager |
Will
Wilson |
Scope:
- Install dual 5" diameter flowlines from subsea wellheaads
to subsea well guide bases tied back to the Shell Mars platform.
The total diameter of the flowlines with insulation was
10" and 12", respectively.
- Install dual pipeline sleds at each end.
Description:
- DB 50 installed 5" pipelines utilizing J-Lay system.
- Installed 2 dual pipeline end sleds
|
Technology & Innovation:
- First installation of dual sled onto flowlines of unequal
unit weights. The dual flowlines would have the natural
tendency to rotate the sled when lowering to the seabed.
Procedures were determined to enable safe sled installation.
- First in-line lifted expansion loop. Several options to
limit the pipeline expansion were considered. The selected
option was to create in-line loops by simultaneously lifting
and flopping over the two flowlines attached to the same
sled located 870 feet from the lifting points and in water
depths as deep as 3,300 feet.
|
