Research on Inter-Fracture Gas Flooding for Horizontal Wells in Changqing Yuan 284 Tight Oil Reservoir

Lingfang Tan, Yi Yang (), Wei Xiong, Rui Shen, Yu Xiong, Yuanhang Qi and Zewei Sun
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Lingfang Tan: University of Chinese Academy of Sciences, Beijing 100049, China
Yi Yang: CNPC Engineering Technology R&D Company Limited, Beijing 102206, China
Wei Xiong: Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Rui Shen: Institute of Porous Flow and Fluid Mechanics, Chinese Academy of Sciences, Langfang 065007, China
Yu Xiong: Petroleum Engineering School, Southwest Petroleum University, Chengdu 637001, China
Yuanhang Qi: Petroleum Engineering School, Southwest Petroleum University, Chengdu 637001, China
Zewei Sun: Petroleum Engineering School, Southwest Petroleum University, Chengdu 637001, China

Energies, 2024, vol. 17, issue 17, 1-14

Abstract: In tight reservoir development, traditional enhanced oil recovery (EOR) methods are incapable of effectively improving oil recovery in tight reservoirs. Given this, inter-fracture flooding is proposed as a new EOR method, and physical model simulation and numerical simulation are performed for inter-fracture water flooding. Compared with inter-fracture water flooding, inter-fracture gas flooding has a higher application prospect. However, few studies on inter-fracture gas flooding have been reported, and its EOR mechanisms and performance are unclear. This paper used the geological model of the actual tight reservoir to carry out numerical simulations for two horizontal wells in the Changqing Yuan 284 block. The results showed that (1) inter-fracture gas flooding can effectively supplement formation energy and increase formation pressure; (2) inter-fracture gas flooding delivers simultaneous displacement, which can effectively increase the swept area in tight reservoirs; (3) injected CO 2 dissolves into the reservoir fluid, reduces fluid viscosity, and improves fluid flow through the reservoir; and (4) the recovery factor increment of the CO 2 injection is higher than those of natural gas injection and N 2 injection. The findings of this research provide references for the production and development of tight reservoirs.

Keywords: tight oil reservoir; inter-fracture flooding; reservoir numerical simulation; gas flooding (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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