In February 2000, the Institute of Petroleum published its ‘Guidelines for the Calculation of Estimated of Energy Use and Gaseous Emissions in the Decommissioning of Offshore Structures’. These guidelines were prepared for the Institute of Petroleum (IOP) by Cordah Limited, Det Norske Veritas and ERT Ltd to assist in the calculation of energy use and gaseous emissions relating to the decommissioning of offshore oil and gas structures. They are intended to represent an overview of "best practice" with regard to the assessment of gross energy use and emissions, as well as being a practical help in standardising the calculation and presentation of data.

This paper summarises the data sets and methodologies used in studies of the decommissioning of offshore installations for the estimation of energy use and gaseous emissions production. It describes a common structure for undertaking such studies, including the rules for analysis and calculation, proposed by the IOP manual. Finally, it reviews some of the experiences of the use of this manual and identifies some points for future development in this discipline.

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