Pressure maintenance and improving oil recovery with immiscible CO₂ injection in thin heavy oil reservoirs

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• 作者：Sixu Zheng ; Huazhou Li ; Daoyong Yang
• 关键词：pressure maintenance ; immiscible CO2 injection ; heavy oil ; well configuration
• 刊名：Journal of Petroleum Science and Engineering
• 出版年：December, 2013
• 年：2013
• 卷：112
• 期：Complete
• 页码：139-152
• 全文大小：11133 K

文摘

Techniques have been developed to experimentally and numerically evaluate performance of CO₂ injection in heavy oil reservoirs for pressure maintenance purpose. More specifically, a three-dimensional (3D) physical model consisting of five vertical wells and three horizontal wells is used to examine the effect of well configurations on pressure maintenance and oil recovery with CO₂ injection in heavy oil reservoirs. The initial oil saturation, oil production rate, water cut, gas-oil ratio, ultimate oil recovery, and distribution of residual oil saturation are examined under three well configurations, which can be optimized to maximize heavy oil recovery when CO₂ injection is employed for pressure maintenance purpose. Subsequently, numerical simulation has been performed to match the experimental measurements. It has been found that pressure maintenance with CO₂ injection is beneficial for oil recovery in heavy oil reservoirs. Compared with the conventional five-spot well configuration, the well configurations associated with horizontal well(s) are found to achieve a better performance, while the well configuration of two horizontal wells (Scenario 鈾?) yields the highest oil recovery. The oil recovery of Scenario 鈾? is experimentally determined to be 38.6% of original oil in place (OOIP) after CO₂ injection.