Performance Evaluation of CO 2 Huff-n-Puff Gas Injection in Shale Gas Condensate Reservoirs

Xingbang Meng, Zhan Meng, Jixiang Ma and Tengfei Wang
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Xingbang Meng: Petroleum Engineering, China University of Petroleum (East China), Qingdao 266000, China
Zhan Meng: Petroleum Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, Regina, SK S4S 042, Canada
Jixiang Ma: PetroChina Huabei Oilfield Company, Renqiu 062552, China
Tengfei Wang: Petroleum Engineering, China University of Petroleum (East China), Qingdao 266000, China

Energies, 2018, vol. 12, issue 1, 1-18

Abstract: When the reservoir pressure is decreased lower than the dew point pressure in shale gas condensate reservoirs, condensate would be formed in the formation. Condensate accumulation severely reduces the commercial production of shale gas condensate reservoirs. Seeking ways to mitigate condensate in the formation and enhance both condensate and gas recovery in shale reservoirs has important significance. Very few related studies have been done. In this paper, both experimental and numerical studies were conducted to evaluate the performance of CO 2 huff-n-puff to enhance the condensate recovery in shale reservoirs. Experimentally, CO 2 huff-n-puff tests on shale core were conducted. A theoretical field scale simulation model was constructed. The effects of injection pressure, injection time, and soaking time on the efficiency of CO 2 huff-n-puff were examined. Experimental results indicate that condensate recovery was enhanced to 30.36% after 5 cycles of CO 2 huff-n-puff. In addition, simulation results indicate that the injection period and injection pressure should be optimized to ensure that the pressure of the main condensate region remains higher than the dew point pressure. The soaking process should be determined based on the injection pressure. This work may shed light on a better understanding of the CO 2 huff-n-puff- enhanced oil recovery (EOR) strategy in shale gas condensate reservoirs.

Keywords: CO 2 huff-n-puff; condensate recovery; shale gas condensate reservoir (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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