两性离子型聚合物调驱体系与中低渗储层的适应性研究

Research on the Adaptability of Amphoteric Polymer System in Middle-Low Permeability Reservoirs

为了评价两性离子型聚合物调驱体系在葡北油田中低渗储层的注入性、封堵性以及选择性封堵能力,模拟葡北油田油藏条件,利用单管均质岩心注入实验测定两性离子型聚合物调驱体系在不同渗透率岩心中的阻力系数、残余阻力系数和封堵率,利用三管均质岩心并联实验测定高-中-低渗各层的分流率。结果表明:该调驱体系在渗透率小于0.1μm^(2)的储层中注入性和流动性较差,在200~500 mD的储层中可实现边调边驱,在非均质性较强储层中的选择性封堵能力较好。

In order to evaluate the injectivity,sealing characteristics and selective plugging ability of amphoteric polymer system in Pubei oilfield with middle-low permeability reservoir, many experiments were carried out under the condition of Pubei oilfield.Rock factor, residual resistance factor and blocking rate were determined by using single-tube homogeneous cores with different permeability. Flow rate of each permeability layer was determined by using three-pipe parallel homogeneous cores. The results showed that injectivity and fluidity of the system were poor in the layer whose permeability was less than 0.1μm^(2);The system could modify profile while flooding in the layer which permeability was between 200 m D and 500 m D;Selective plugging ability of the system was well in high heterogeneous reservoir.