Rreservoir Physical Properties Change Around Polymer Flooding And The Potential Countermeasure Analysis

Polymer flooding in tertiary oil recovery technology is important and one of the more mature technology,is an effective way to enhance oil recovery.Because of the inherent viscoelastic polymer,its aqueous solution injected into formation,can increase the viscosity of aqueous phase reduce water phase permeability,control of water flooded layer phase flow,improve the mobility ratio of water phase,the adjustment of injection profile,thereby expanding swept volume,improve recovery factor.As a reservoir of oil and gas reservoir space,the carry of the polymer solution and adsorption will cause the corresponding change of reservoir parameters,study the changes of the reservoir property of the polymer flooding,is the basis of the residual oil potential after polymer flooding.Reservoir physical property data of the restriction of the development process of the whole reservoir plays an important role,so after polymer flooding,the reservoir physical property parameters of whether the corresponding changes have taken place,how to change?Firstly,starting from the existing data,the investigation of dynamic development,coring well sedimentary background,sandbody,micro pore structure,mineral composition and grain size and other conditions,to determine the available for comparison of polymer flooding changes before and after the physical parameters of samples.On this basis,using plenty of material test data before and after flooding two coring wells,statistical variation from the macro statistics of porosity and permeability and shale content;the variation characteristics of casting thin sections,scanning electron microscope and mercury analysis before and after polymer flooding experiment of fine pore structure characterization;changing characteristics of polymer flooding before and after the clay minerals were analyzed by using X diffraction experiment and clay minerals,with the core of self determination of wettability of polymer flooding and core absorption method,combined with an analysis of the literature on the wettability of poly and changes before and after flooding;micro displacement process for experimental study of water flooding,polymer flooding and subsequent water flooding by CT scanning and a detailed analysis of different flooding process,and gives the water flooding,polymer flooding and subsequent water flooding after the micro residual oil forms and different displacement of residual oil phase distribution.Finally,through the above research,the potential analysis is carried out,and the ways of tapping the potential of remaining oil after polymer flooding are given.The problems to be paid attention to during the implementation are analyzed,which provides guidance for furtherdevelopment and adjustment of the block after polymer flooding.