Influence of Well Pattern Type on Remaining Oil Saturation and Distribution after Development

Hongjun Fan, Xiabin Wang, Weijia Cao, Kun Yan, Kun Xie, Xiangguo Lu and Mingwei He
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Hongjun Fan: State Key Laboratory of Offshore Oil Exploitation, CNOOC, Beijing 100028, China
Xiabin Wang: State Key Laboratory of Offshore Oil Exploitation, CNOOC, Beijing 100028, China
Weijia Cao: Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 166318, China
Kun Yan: Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 166318, China
Kun Xie: Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 166318, China
Xiangguo Lu: Key Laboratory of Enhanced Oil Recovery of Education Ministry, Northeast Petroleum University, Daqing 166318, China
Mingwei He: State Key Laboratory of Offshore Oil Exploitation, CNOOC, Beijing 100028, China

Energies, 2022, vol. 15, issue 7, 1-14

Abstract: The reservoir heterogeneity of Q oilfield is more severe after long-term water injection development, and water flooding is ineffective. In this study, the combined technologies of profile control, profile control and flooding, and oil displacement were proposed to improve the water flooding development effect. Then, the influence of the well pattern type on the remaining oil distribution, after development, was investigated. Cr 3+ polymer gel, which has an optimal gel-forming effect, was used as the profile control agent. Moreover, the entire molecular structure had a “network” structure. A polymer microsphere was used as a profile control and flooding agent, which showed a good hydration expansion capacity. The initial particle size distribution had a range of 7.2–11.1 μm, and the expansion multiple was 4.35–5.64 after 7 days. The surfactant was an oil displacement agent, and the interfacial tension was approximately 5.08–5.11 × 10 −1 mN/m. After the “profile control + profile control and flooding + oil displacement” technologies, the horizontal well pattern had a large seepage area. The effect of expanding the sweep volume was significant, and the remaining oil saturation in each stage was lower than those of the vertical and horizontal–vertical combined well patterns. Compared with the first water flooding stage, the remaining oil saturation values of the three permeable layers changed by 11.9%, 17.3%, and 19.8% during the subsequent water flooding stage.

Keywords: profile control; oil displacement; well pattern; horizontal well; vertical well; remaining oil saturation (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: 2022
References: View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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