东北石油大学学报2025，Vol.49Issue(2)：107-116,10.DOI:10.3969/j.issn.2095-4107.2025.02.009
海上油田聚合物驱与加密协同开发模式下微观渗流特征
Micro-scale seepage characteristics in the cooperative development model of polymer flooding and well densi-fication in offshore oilfields
摘要
Abstract
The recovery rate in the SZ36-1-Ⅰ phase offshore oilfield development area is lower than that in onshore fields,with a rapid increase in water cut and high amounts of residual oil in the contiguous re-gions.Based on increasing the displacement-phase viscosity,a polymer flooding development model is proposed,which incorporates well pattern optimization and measures to enhance the displacement pres-sure gradient.This approach combines polymer flooding with enhanced well pattern density for a syner-gistic effect.A numerical model for polymer flooding at the pore scale is established based on the Cahn-Hilliard and Navier-Stokes equations,which simulates the polymer flooding process after water flooding and analyzes the effects of pressure gradient and viscosity on the development outcome.The results indi-cate that increasing the injection pressure gradient and the water-oil viscosity ratio can significantly en-hance the sweep efficiency and oil recovery.When the pressure gradient increases by 1.5 times,the re-covery rate can increase by 22.2％.When the viscosity ratio is doubled,the recovery rate can further in-crease by 4.8％.The increase in pressure gradient in the newly swept region after polymer flooding,combined with the viscosity-enhancing effect of chemical agents,effectively mobilizes the residual oil in the contiguous regions,achieving synergistic effects between polymer flooding and enhanced well pat-tern density.These findings clarify the enhanced effect of flow control and the increase in pressure gra-dient on the improvement of polymer migration capabilities,providing guidance for designing polymer flooding plans to further improve the recovery rate in offshore oilfields.关键词
海上油田/孔隙尺度/聚合物驱/加密开发/毛细管数/采出程度/微观渗流Key words
offshore oilfields/pore scale/polymer flooding/well densification/capillary number/recov-ery degree/microscopic seepage分类
石油、天然气工程引用本文复制引用
唐恩高,张增华,苏彦春,杨二龙,齐梦..海上油田聚合物驱与加密协同开发模式下微观渗流特征[J].东北石油大学学报,2025,49(2):107-116,10.基金项目
中国海洋石油有限公司"十四五"重大科技项目(KJGG2021-0500) （KJGG2021-0500）
