Mechanism of Produced Gas Reinjection During CO₂ Flooding by Chromatographic Analysis

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.

Keywords:

• Chromatographic analysis
• CO₂ flooding
• MMP
• produced gas reinjection
• slim tube test

Acknowledgments

This study was supported by National Basic Research Program of China (2011CB707304). The authors would like to thank Jilin oilfield for its encouragement and assistance throughout the project and preparation of this article.