The Tension Leg Platform Technology - Historical and Recent Developments

Deepwater structures are expensive to fabricate and install, and at the end of their useful life, will also be expensive to decommission. From 1989 to 2012, 15 structures in water depth greater than 400 ft were decommissioned in the U.S. Gulf of Mexico. The purpose of this chapter is to estimate cost for well plugging and abandonment, conductor severance and removal, pipeline abandonment, umbilical and flowline removal, and platform removal for the 95 deepwater structures (50 fixed platforms, 3 compliant towers, and 42 floaters) in the Gulf of Mexico circa January 2013. Work decomposition algorithms developed by ProServe Offshore are combined with government databases and the author's generalizations to provide order-of-magnitude cost estimates for the deepwater structure inventory. Bullwinkle and Pompano are expected to be the most expensive fixed platform decommissioning projects estimated at $265 million and $203 million, respectively. Mars is expected to be the most expensive floater decommissioning at a cost of $336 million, followed by Ursa ($222 million), Auger ($205 million), and Hoover/Diana ($201 million). Total decommissioning liability for the deepwater structure inventory based on 2009–2010 market conditions and technologies and the collection of assumptions described herein, is estimated at $6.7 billion, $2.4 billion for fixed platforms and compliant towers, and $4.3 billion for floaters.

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The Technical and Economic Feasibility of the CENTEC Floating Offshore Wind Platform

Filgueira-Vizoso

Castro-Santos

Iglesias

et al. 2022

JMSE

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This paper defines a methodology for the economic feasibility analysis of a floating offshore wind farm composed of tensioned leg platforms, which are part of the EU ARCWIND research project. In this context, the phases and subphases of its life-cycle process are considered to deal with aspects such as bathymetry, characteristics of the platforms, distance from the farm to shore, distance from the farm to port and offshore wind speed. All the costs and other external parameters such as capital cost, electric tariff, interest rate, percentage of financing and corporate tax have been analysed to calculate the internal rate of return, net present value, discounted pay-back period and levelized cost of energy of the farm. This work studies a farm composed of TLP offshore wind platforms designed by CENTEC and located at Ribadeo in Spain. Results indicate the costs and the economic feasibility of this platform for deep waters. They indicate that the platform is economically feasible for the location selected.

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The Tension Leg Platform Technology - Historical and Recent Developments

Cited by 9 publications

References 7 publications

Offshore oil and gas records circa 2020

Offshore oil and gas records circa 2020

Decommissioning Cost Estimation in the Deepwater U.S. Gulf of Mexico

The Technical and Economic Feasibility of the CENTEC Floating Offshore Wind Platform

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