Offshore pipeline installation was expertly provided as a turnkey solution for the successful installation of oil and gas sales pipelines in the SMI 58 and SMI 69 blocks.
The 60,720-foot offshore pipeline installation campaign involved a diverse range of pipeline sizes, including 3-inch, 4-inch, 6-inch, and 8-inch lines installed in water depths averaging approximately 140 feet. The project scope included critical tasks such as pipeline burial to protect against environmental and mechanical hazards, riser installations, fabrication and tie-in of pipeline segments, crossing mitigation to manage interactions with existing infrastructure, as well as pigging, hydro testing, and final commissioning to ensure operational readiness.
A particularly unique aspect of this campaign was the execution of a triple lay technique for a significant portion of the pipeline installation. This innovative pipelay method required thorough planning and dockside preparation to ensure safety and efficiency. The triple lay approach significantly enhanced project productivity by reducing the number of pipeline initiations, minimizing barge anchor setups, and streamlining pipeline laydowns, which contributed to lowering both time and operational costs.
Morrison worked in close partnership with export pipeline companies to complete hot tap tie-ins on critical transmission lines. The specialized diving operations were performed utilizing Morrison’s advanced dive support vessels, with the DSV Kelly Morrison handling saturation and surface dive activities to support riser clamp installations, pipeline tie-ins, and other underwater tasks, while the DSV Joanne Morrison provided additional saturation diving support throughout the project.
- Storage of pipe at Morrison facility until client was ready for installation
- Transported pipe and materials offshore
- Lay and bury the pipelines with the CM-15
- Install the tie-ins, pig, hydrotest and commission the pipelines with the DSV Kelly Morrison
- Saturation support with the DSV Joanne Morrison
- Triple-mat installation
- Triple pipeline installation
- Turn the pipelines over to operations ready for service
The project was completed was completed on time, without incident. The overall success of the project can be attributed to the proper planning and execution under a “one-team partnership approach.” – Morrison Project Manager
