Reservoir Evaluation and Development ›› 2019, Vol. 9 ›› Issue (3): 25-31.

• Methodological and Theory • Previous Articles     Next Articles

Numerical simulation of tight oil extraction with supercritical CO2

Shi Leiting1,Zhu Shijie1,Ma Jie2,Yang Mei3,Peng Yangping4,Ye Zhongbin1   

  1. 1. State Key Laboratory of Oil and Gas Reservoir Geology and Exploitation, Southwest Petroleum University, Chengdu, Sichuan 610500, China
    2. Yulin Yuchuan Natural Gas Co. Ltd., SPT group, Southwest Oil and Gas Company, CNPC Yulin, Shaanxi 719000, China
    3. Sichuan Vocational College of Chemical Technology, Luzhou, Sichuan 646099, China
    4. Baikouquan Oil Production Plant, Xinjiang Oilfield Company, PetroChina, Karamay, Xinjiang 834000, China
  • Received:2019-01-08 Online:2019-06-26 Published:2019-07-02


The huff and puff operation by CO2 extraction can overcome the production and development problems of tight reservoirs which are difficult to form effective displacement. Crude oil fractions were divided by PVTi module, and the pseudo-component properties of formation crude oil could be obtained by combining with the expansion experimental data of CO2 injection. Relevant factors affecting the extraction of tight oil by CO2 were studied by CFD simulation. The results showed that supercritical CO2 mainly extracted the light components of crude oil in porous media, especially those below C15+. The higher injection pressure was, and the more CO2 was injected, the stronger the solubility of crude oil would be, and it could enhance the extraction of heavy components. Meanwhile, the increase of CO2 injection could also promote the retention of CO2 in porous media, which was conducive to CO2 storage. With the increase of porosity, the extraction effect of CO2 increased first and then decreased, and was still 44 % under the condition of lower porosity. The extraction of tight oil by CO2 has a certain application prospect.

Key words: tight oil, CO2, extraction, porous media, numerical simulation

CLC Number: 

  • TE348