聚合物溶液、凝胶和微球渗流特性差异及其作用机理研究

Seepage Characteristic Difference and Seepage Mechanism of Polymer Solution，Gel and Microsphere

肖丽华 鲍文博 金玉宝 卢祥国 郐婧文

XIAO Lihua BAO Wenbo JIN Yubao LU Xiangguo GUI Jingwen

化学剂调驱矿场实际增油效果与预期值还存在差距，主要原因之一是调驱剂与储层岩石孔隙配伍性较差，未能形成有效滞留和驱替，制约了调驱技术的发挥。为了提高调驱剂在孔喉中的有效滞留和实现液流转向效果，以渤海油田储层和流体物性为模拟对象，研究了聚合物溶液、凝胶和微球的渗流特性和作用机理。结果表明，与聚合物溶液相比，Cr3+聚合物凝胶阻力系数和残余阻力系数较大，且残余阻力系数大于阻力系数，表现出独特的渗流特性；聚合物微球具有缓膨特性，可以在吸水膨胀前进入岩心孔隙内并在其中吸水膨胀，进而产生较强滞留和封堵作用以及较好的液流转向效果。与聚合物溶液的分子聚集体相比，聚合物微球粒径分布较集中，相同岩心条件下不可及体积较大，而不可及孔隙中剩余油能被微球携带液波及，整体波及效率提高。图11表5参19

There was still a gap between actual oil increase effect and expected value of chemical flooding. One of the main reasons was that the compatibility between profile control agent and pore size of reservoir rock was poor，and the effective retention and displacement could not form，which restricted the exertion of profile control and oil displacement technology. In order to improve the effective retention of flooding agent in pore throat and achieve the effect of liquid flow steering，the seepage characteristic and mechanism of polymer solution，gel and microsphere were studied based on reservoir and fluid properties of Bohai oilfield. The results showed that the resistance coefficient and residual resistance coefficient of Cr3+ polymer gel were larger than those of polymer solution，and the residual resistance coefficient was greater than resistance coefficient，showing unique seepage characteristic. Polymer microsphere had the characteristic of slow expansion，and could enter into the core pore before water swelling and expand in it，which resulted in strong retention and sealing and better effect of fluid diversion. Compared with molecular aggregate in polymer solution，the particle size distribution of polymer microspheres was more concentrated. In the same core condition，the volume inaccessible of polymer microspheres was larger，but the remaining oil in inaccessible pore volume could be affected by carrying fluid of microsphere，which improved the overall sweep efficiency.