Abstract
CO2 flooding is a win-win technology, sequestrating greenhouse CO2 while producing a significant amount of crude oil to help defray the cost of CO2 sequestrating and enhancing oil recovery. However, due to the difference of sedimentary environment and poor properties of formations, physical properties of the crude oil and the effect of CO2 flooding are not always satisfactory in most oilfields of China. Therefore, in this article, to improve the understanding of the oil recovery mechanisms and feasibility of CO2 flooding in China, based on the oil and gas of Mao-3 oilfields, phase behavior of the CO2 and crude oil system was investigated. Parameters like saturated pressure, volume factor, gas oil ratio, and viscosity were measured and their relationships analyzed. Results show that crude oil of Mao-3 reservoir and CO2 has good mutual dissolution under reservoir conditions, and CO2 could expand the oil and reduce the oil viscosity greatly. As a result, formation energy could be enhanced and flow characteristics of the oil could be improved by CO2 flooding.
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