The Application of Solvent-Additive SAGD Processes in Reservoirs with Associated Basal Water

Paper Number: SPE 137883-PP

Authors: J. Peterson, D. Riva, N. Edmunds, S. Solanki – Laricina Energy Ltd.

Source: This paper was prepared for presentation at the Canadian Unconventional Resources & International Petroleum Conference held in Calgary, Alberta, Canada, 19–21 October 2010.

Copyright: Copyright 2010, Society of Petroleum Engineers

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This paper describes the results of a simulation and optimization study on the application of solvent-additive steam-assisted gravity drainage (SAGD) process to reservoirs with associated basal water. A general conclusion drawn from literature is that optimal solvent application to SAGD in reservoirs will likely involve time variations in both rate and composition of the solvent. This is also the case for reservoirs with associated basal water. This results in an optimization problem that has a large number of dimensions, and is very nonlinear. Genetic algorithms, which mimic biological evolution, have been found to be extremely effective in addressing such problems. A key product of this effort, optimized for a simple clastic reservoir with associated basal water, is presented. The study produced an operable process, which could be described as a new combination of pre-existing concepts. The process offers material improvements in thermal bitumen supply costs, as well as recovery factor. Major reductions in the physical steam/oil ratio (SOR), (and therefore) capital intensity, water use and carbon emissions, are indicated.

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