Phase Behavior and Rational Development Mode of a Fractured Gas Condensate Reservoir with High Pressure and Temperature: A Case Study of the Bozi 3 Block

Yongling Zhang, Yangang Tang, Juntai Shi (), Haoxiang Dai, Xinfeng Jia, Ge Feng, Bo Yang and Wenbin Li
Additional contact information
Yongling Zhang: Tarim Oilfield Company, PetroChina, Korla 841000, China
Yangang Tang: Tarim Oilfield Company, PetroChina, Korla 841000, China
Juntai Shi: College of Information and Control, China University of Petroleum, Beijing 102249, China
Haoxiang Dai: China United Coalbed Methane Co., Ltd., Taiyuan 030000, China
Xinfeng Jia: College of Information and Control, China University of Petroleum, Beijing 102249, China
Ge Feng: College of Information and Control, China University of Petroleum, Beijing 102249, China
Bo Yang: China United Coalbed Methane Co., Ltd., Taiyuan 030000, China
Wenbin Li: Research Institute of Oil Exploration and Development, Liaohe Oilfield of PetroChina, Panjin 124010, China

Energies, 2024, vol. 17, issue 21, 1-17

Abstract: The Bozi 3 reservoir is an ultra-deep condensate reservoir (−7800 m) with a high temperature (138.24 °C) and high pressure (104.78 MPa), leading to complex phase behaviors. Few PVT studies could be referred in the literature to meet such high temperature and pressure conditions. Furthermore, it is questionable regarding the applicability of existing condensate production techniques to such a high temperature and pressure reservoir. This study first characterized the phase behavior via PVT experiments and EOS tuning. The operating conditions were then optimized through reservoir numerical simulation. Results showed that: (1) the critical condensate temperature and pressure of Bozi 3 condensate gas were 326.24 °C and 43.83 MPa, respectively; (2) four gases (methane, recycled dry gas, carbon dioxide, and nitrogen) were analyzed, and methane was identified as the optimal injection gas; (3) gas injection started when the production began to fall and achieved higher recovery than gas injection started when the pressure fell below the dew-point pressure; (4) simultaneous injection of methane at both the upper and lower parts of the reservoir can effectively produce condensate oil over the entire block. This scheme achieved 8690.43 m 3 more oil production and 2.75% higher recovery factor in comparison with depletion production.

Keywords: PVT experiment; phase behavior; reservoir simulation; gas injection (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: 2024
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