Blocking effect and numerical study of polymer particles dispersion flooding in heterogeneous reservoir

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Zhu, Weiyao^1 ; Li, Jianhui^1 ; Lou, Yu^2

School of Civil and Resource Engineering, University of Science and Technology Beijing, Beijing, China^1

Strategic Research Center of Oil and Gas Resources, Ministry of Land and Resource of PRC, Beijing, China^2

关键词: Concentration distributions;    Heterogeneous reservoirs;    Improve oil recovery;    Particle concentrations;    Relative permeability;    Reservoir permeability;    Residual resistance;    Two phase flow model;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/2/022006/pdf
DOI  :  10.1088/1755-1315/121/2/022006

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

Polymer flooding has become an effective way to improve the sweep efficiency in many oil fields. Many scholars have carried out a lot of researches on the mechanism of polymer flooding. In this paper, the effect of polymer on seepage is analyzed. The blocking effect of polymer particles was studied experimentally, and the residual resistance coefficient (RRF) were used to represent the blocking effect. We also build a mathematical model for heterogeneous concentration distribution of polymer particles. Furthermore, the effects of polymer particles on reservoir permeability, fluid viscosity and relative permeability are considered, and a two-phase flow model of oil and polymer particles is established. In addition, the model was tested in the heterogeneous stratum model, and three influencing factors, such as particle concentration, injection volume and PPD (short for polymer particle dispersion) injection time, were analyzed. Simulation results show that PPD can effectively improve sweep efficiency and especially improve oil recovery of low permeability layer. Oil recovery increases with the increase of particle concentration, but oil recovery increase rate gradually decreases with that. The greater the injected amount of PPD, the greater oil recovery and the smaller oil recovery increase rate. And there is an optimal timing to inject PPD for specific reservoir.