Study on CO 2 Induced Gas Channeling in Tight Gas Reservoirs and Optimization of Injection Production Parameters

Haijun Yan, Gang Cheng, Jianlin Guo, Runxi Wang, Bo Ning, Xinglong Wang (), He Yuan and Huaxun Liu
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Haijun Yan: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Gang Cheng: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Jianlin Guo: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Runxi Wang: Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
Bo Ning: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Xinglong Wang: Institute of New Energy and Low-Carbon Technology, Sichuan University, Chengdu 610065, China
He Yuan: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Huaxun Liu: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China

Energies, 2025, vol. 18, issue 21, 1-20

Abstract: Tight gas reservoirs are characterized by low porosity, low permeability, and strong heterogeneity. CO 2 flooding, as an important approach for enhancing gas recovery while achieving carbon sequestration, is often restricted by gas channeling. Based on the sandstone reservoir parameters of the Shihezi Formation in the Ordos Basin, a two-dimensional fracture–matrix coupled numerical model was developed to systematically investigate the effects of fracture number, fracture inclination, fracture width, injection pressure, and permeability contrast on gas breakthrough time and sweep efficiency. A second-order regression model was further established using response surface methodology (RSM). The results show that a moderate fracture density can extend breakthrough time and improve sweep efficiency, while permeability contrast is the fundamental factor controlling gas channeling risk. When the contrast increases from 0.7 to 9.9, the breakthrough efficiency decreases from 88.5% to 68.9%. The response surface analysis reveals significant nonlinear interactions, including the coupled effects of fracture number with fracture width, injection pressure, and inclination angle. Under the optimized conditions, the breakthrough time can be extended to 46,984 h, with a corresponding sweep efficiency of 87.7%. These findings provide a quantitative evaluation method and engineering optimization guidance for controlling CO 2 channeling in tight gas reservoirs.

Keywords: tight gas; gas channeling; carbon dioxide (CO 2 ); enhanced gas recovery (EGR); response surface methodology (RSM) (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: 2025
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