The Feasibility Appraisal for CO 2 Enhanced Gas Recovery of Tight Gas Reservoir: Experimental Investigation and Numerical Model

Ying Jia, Yunqing Shi, Weiyi Pan, Lei Huang, Jin Yan and Qingmin Zhao
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Ying Jia: Exploration and Production Research Institute, Sinopec, Beijing 100083, China
Yunqing Shi: Exploration and Production Research Institute, Sinopec, Beijing 100083, China
Weiyi Pan: Exploration and Production Research Institute, Sinopec, Beijing 100083, China
Lei Huang: Research Institute of Petroleum Exploration and Development, PetroChina, Beijing 100083, China
Jin Yan: Exploration and Production Research Institute, Sinopec, Beijing 100083, China
Qingmin Zhao: Exploration and Production Research Institute, Sinopec, Beijing 100083, China

Energies, 2019, vol. 12, issue 11, 1-18

Abstract: This paper proves the soundness of supercritical CO 2 displacement for enhancing gas recovery of a tight gas reservoir via laboratory investigations and compositional modeling. First, a novel phase behavior experimental device with a screened supercritical CO 2 dyeing agent were first presented to better understand the mixture characteristics between supercritical CO 2 and natural gas. The mass transfer between two vapor phases was also measured. Then, based on experimental results, the compositional model considering the influence of CO 2 diffusion on the gas recovery and critical property adjustment of supercritical CO 2 was established. The miscibility process and mixing properties, such as density, viscosity, and the flowing velocity vector, of supercriticalCO 2 and natural gas were visualized through a 3D display, which obtained a better understanding of the flooding mechanism of Enhanced Gas Recovery (EGR) via supercritical CO 2 . Finally, with experiments and numerical simulations, the main benefits of CO 2 EGR were shown, which were partial miscibility between CO 2 and natural gas, pressure maintenance, and CO 2 displacement as a “gas cushion.” In general, experiments and numerical simulations demonstrate that CO 2 EGR can be seen as a promising way of prolonging the productive life and enhancing recovery of tight gas reservoirs.

Keywords: CO 2; enhanced gas recovery (EGR); tight gas reservoir; experiment; numerical model (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: 2019
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