SU Yuliang,JIANG Miaolun,MENG Fankun,et al.Flow modelling of CO2 foam flooding in low permeability reservoirs based on fractional flow function[J].Journal of Shenzhen University Science and Engineering,2018,35(No.2(111-220)):187-196.[doi:10.3724/SP.J.1249.2018.02187]





Flow modelling of CO2 foam flooding in low permeability reservoirs based on fractional flow function
1)中国石油大学(华东)石油工程学院,山东青岛 266580
2)中国石油勘探开发研究院,北京 100083
3)中国石油长庆油田采气三厂,陕西西安 017300
SU Yuliang1 JIANG Miaolun1 MENG Fankun2 ZHAN Shiyuan1 SHENG Guanglong1 and CHEN Ying3
1) School of Petroleum Engineering, China University of Petroleum, Qingdao 266580, Shandong Province, P.R.China
2) PetroChina Research Institute of Petroleum Exploration & Development, Beijing 100083, P.R.China
3) The Third Gas Production Plant of Changqing Oilfield, Xi’an 017300, Shaanxi Province, P.R.China
oil and gas field development engineering low permeability oil reservoir CO2 foam flooding fluids seepage characteristic water-saturation distribution fractional-flow function numerical simulation graphic solution
TE 348
The seepage mechanism of foam flow in porous media is very complicated. The purpose of this research is explaining the flooding mechanism accurately and revealing the seepage mechanism of CO2 foam flow in porous media. Based on the characteristics of CO2 foam flow in low permeability oil reservoirs, a novel model of CO2 foam flooding considering the effects of surfactant adsorption and threshold pressure gradient is established and solved using the fractional-flow function and the principle of material balance. We derive the fractional-flow solutions for the foam displacement to find the water-saturation distribution in system, in the two cases of surfactant dissolved in supercritical CO2 or in water, respectively. The numerical simulations are presented to verify the graphical solutions obtained from fractional-flow function. In addition, the controlling factors that control the mobility and moving velocity of the foam bank are investigated, and the optimal design of flooding process is proposed (in the context of idealized 1D displacements). As the water fraction of the injected foam increases with deterioration of foam quality, the velocity of the flooding front would first increase and then decrease. Therefore, the optimal water fraction can be expected to maintain the gas front slightly ahead of the foam front for best performance. The propagation of the foam front depends on both surfactant adsorption onto rock and the partitioning of surfactant between water and CO2. The optimal process can be reached while the ratio of surfactant concentrations dissolved in CO2 to that in water tends to zero. Our work can provide a theoretical basis for the design of CO2 foam process in field applications.


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Foundation:National Basic Research Program of China (2014CB239103); National Natural Science Foundation of China (51674276)
Corresponding author:Professor SU Yuliang. E-mail: suyuliang@upe.edu.cn
Citation:SU Yuliang, JIANG Miaolun, MENG Fankun, et al. Flow modelling of CO2 foam flooding in low permeability reservoirs based on fractional flow function[J]. Journal of Shenzhen University Science and Engineering, 2018, 35(2): 187-196.(in Chinese)
引文:苏玉亮,姜妙伦,孟凡坤,等. 基于分流理论的低渗透油藏CO2泡沫驱渗流模拟[J]. 深圳大学学报理工版,2018,35(2):187-196.
更新日期/Last Update: 2018-03-07