Multi-objective optimization of a CO2-EOR process from the sustainability criteria
2018
Abstract Aim of this article is to estimate and discuss the economic and environmental impacts for the obtainment of CO 2 in such conditions to be injected as enhanced oil recovery (EOR) fluid. Particularly, this study focuses on the compression sector design needed to process the CO 2 coming from an already existing absorption plant. Currently, 18.68 kmol/h of a high-purity CO 2 stream may be used for injecting and increasing the production of a pilot crude oil well near the location of the industrial plant. However, it is still necessary to perform an economic evaluation to quantify the investment and the operating costs that the compression involves. An optimization problem for minimizing the energy consumption of the new sector while increasing the pressure of the stream is solved. It has been found that the conditions to obtain the lower energy requirement are a 4-stage compressing layout with a pressure ratio equal to 4 and intercooling units of 41.73 °C. After discussing these results, an economic assessment to estimate investment, operating and utility costs is presented. Although the installation cost for the additional sector is more than 3000 kUSD, the investment might be compensated with the increasing production of the well under study. In addition to this, the development of EOR projects could create a market in a region where the technology is still not considered. In the final part of the article, CO 2 , CH 4 , H 2 O wastes and combustion gases emissions are calculated. As expected, almost the total amount of the vented CO 2 can be captured for this double-purpose technology, increasing the total incomes while geologically confining large-volumes of this pollutant and greenhouse gas.
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