Abstract
CO2 flooding process has been a proven valuable method that could not only enhance oil recovery but also store greenhouse gas. However, CO2 source greatly restrict its application in China. In this article, based on the produced oil and gas of Jilin oilfield, slim tube tests were conducted to study the feasibility of the produced gas reinjection without separation. In addition, according to the phenomenon of the experiment, displacement process was divided into three stages. Chromatographic analysis was conducted to study the mechanism of production gas reinjection during CO2. Results indicate that components of the produced oil change along with CO2 content, displacement pressure and production stages.
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