交联聚合物动态成胶及运移的室内模拟研究

室内采用长岩芯填砂装置模拟了交联聚合物注入、成胶封堵和运移过程。室内模拟结果表明,注入的调剖体系能够达到设计的封堵位置,在注入过程中体系受稀释、剪切和吸附等因素影响,其浓度和成胶前的初始黏度沿程呈下降趋势。在实验所用的浓度(0.2%HPAM)条件下,孔隙介质中的堵剂体系形成有效堵塞的时间显著延长,是静态条件下的6倍;从不同部位堵剂取样成胶后黏度和岩芯封堵前后注水压力变化情况看,有效封堵距离r小于设计封堵距离r′,0.67r′

Laboratory Study on Dynamic Gelation Behavior and Transfer Process of Crosslinked Polymer

We simulate the injection of the gelatin and transfer process of crosslinked polymer in porous medium with long core equipment.The experiment shows the injected crosslinked polymer can reach the design position.Influenced by dilution,shearing and adsorption,the concentration and initial viscosity of the crosslinked polymer solution decrease lengthwisely.The dynamic gel time prolonges to 6 times than the static gel time at the experiment condition(HPAM concentration is 0.2%).Compared with the sample viscosities after gelatin and the pressure change before and after plugging at different positions on the long core,the efficient plugging distance -r is less than the design plugging distance -r′,0.67r′ < r < r′.It also shows that the sequent water flooding after plugging can drive a few gelatin move into deep reservoir along the high permeability pool,form the effect of flooding.