双重介质油藏聚合物和交联聚合物驱油研究

对双重介质油藏,提出了用聚合物和交联聚合物驱油的方法来提高其采收率.建立了双重介质油藏聚合物驱油和地下交联聚合物驱油的两维两相五组分的双渗双孔数学模型.该模型考虑了溶剂驱替过程中的各种物理化学现象(粘度、阻力系数、吸附、滞留、扩散以及双重介质中的渗吸等),对该模型中所涉及的主要参数提出了易于应用的数学表达式;采用有限差分法对模型进行求解;并进行了一系列的数值计算.分析了聚合物和交联聚合物在双重介质油藏中的渗流规律,研究了聚合物浓度、交联聚合物驱的交联强度以及裂缝渗透率与基质渗透率之比等因素对双重介质油藏驱油效果的影响,比较了聚合物驱和地下交联聚合物驱的驱油效果,得到了一些有价值的结论.为双重介质油藏进行聚合物驱和地下交联聚合物驱提供理论指导和优选方法.

A STUDY ON POLYMER/CROSSLINKING POLYMER DISPLACEMENT IN FRACTURED RESERVOIR

A polymer and crosslinking polymer displacement method is presented to enhance oil recovery of dual media reservoir.A two dimensional,two phases,five components,dual permeability and dual porosity mathematical model,which can solve polymer flooding and underground crosslinking polymer flooding in dual media reservoir are set up.The model incorporates many physicochemical process variables including viscosity resistance coefficient,absorption retention,dispersion,imbibition and so on.This model can be used to do a series of numerical calculations, analyze the percolation law of polymer in dual media reservoir,study the effect of polymer concentration and ration of fracture permeability to matrix permeability on oil displacement efficiency.By comparing the oil displacement efficiency of polymer flooding with that of underground crosslinking polymer flooding,some useful conclusions are drawn.Theoretical instruction and optimization method for polymer flooding and underground crossliking polymer flooding in dual media reservoir are presented in this paper.