The CX-15 buoyant tower designed by a joint venture between GMC and Horton Wison Deepwater for BPZ Energy has completed fabrication at Wison Offshore & Marine’s yard in Nantong China and sailed on 5 August en route for Peru.
The Shallow Water Buoyant Tower is a world’s first and will be located about one mile from the existing CX-11 platform in a water depth of 175 feet (53 m) in the Corvina field in offshore block Z-1, with both platforms interconnected via a series of subsea pipelines.
Kevin Chell, CEO of the joint venture and COO of GMC stated: “We are very pleased to have reached this significant milestone without any issues and are now ready for the challenge of the installation phase due in early September at the final tower location. GMC provided Project Management expertise and personnel for BPZ during the fabrication phase, and are also providing the same Project Management support for the Installation phase, so we have been fully immersed in the whole project from the start.”
A key driver for the project is that the transport vessel also performs the main installation as the hull and topside are floated off in sequence eliminating the need for a separate heavy lift vessel at the Tower location.
Jim Maher, COO of the JV and Vice President of Horton Wison Deepwater commented: “Wison Offshore & Marine has done an excellent job with this important project and we are very pleased to see our innovative design fabricated and now heading to the final location for the installation phase.”
Shallow Water Buoyant Tower Design
The Buoyant Tower concept draws on the proven technology of the cellspar, and the design provides multiple benefits for fields where other concepts would be problematic requiring high capital costs and expensive crane barges for installation.
The buoyant tower can operate in water depths up to 700 feet (213m) and can be relocated allowing small marginal plays to be exploited in a cost effective manner.
The design allows for hydrocarbon storage if needed, can eliminate separate shallow water drilling units, and provides a high level of flexibility for the operator.
The benefits of the design were recognized and adopted by BPZ Energy for their new platform at the Corvina field.
The tower is composed of four cylindrical cells and is connected to the seabed by a single foundation can that is integral to the hull structure. The tower and decks with the production equipment will be transported from the fabrication yard to Corvina on a submersible heavy lift ship.
After upending, fixed and variable ballast will be pumped into the hull to provide stability for the platform.
The platform is designed for 12,200 barrels of oil per day (1940 m3/d), gas compression capacity of 12.8 million standard cubic feet per day (0.36 million Sm3/d) and produced water handling and injection capacity of 3,500 barrels per day (557 m3/d).
A total of 24 drill slots will be available, some of which will be used for gas and water reinjection wells.
GMC is an industry leader in innovative engineering, project management and installation solutions for offshore oil & gas SURF, drilling, and production projects.
Established in 1991, GMC has offices in Houston, London and Beijing and the company has developed strategic partnerships with key customers & partners. ‘GMC - Experience where it counts, innovation where it matters’.
Horton Wison Deepwater is one of the World’s leading offshore technology development companies. Horton develops the products that oil and gas companies need across the globe in their search for hydrocarbons.
Created by Ed Horton, one of the industry’s most successful innovators, the company continues in the path set out by its founder three decades ago when the tension leg platform (TLP) was first patented.
Since then, Horton’s team has developed the Spar concept and steered it through its evolution from the original Classic Spar through the Truss Spar to today’s Cellspar.
Seventeen Horton floating production and drilling units have been built and are working today in the deep oceans worldwide.