两性离子聚合物凝胶成胶效果及油藏适应性研究

Static Gelling Effect and Reservoir Adaptability of Amphion Polymer Gel

刘进祥 卢祥国 牛丽伟 张云宝 谢 坤 赵劲毅 李国桥 陈 阳

LIU Jinxiang LU Xiangguo NIU Liwei ZHANG Yunbao XIE Kun ZHAO Jinyi LI Guoqiao CHEN Yang

为客观有效评价交联聚合物溶液在储层孔隙内的成胶效果， 采用黏度计、 动/静态激光光散射仪、 原子力显微镜和岩心流动实验， 对两性离子聚合物溶液 （AIPS） 和交联聚合物溶液 （AICPS） 的黏度、 分子线团尺寸、 分子聚集态、 渗透率极限和静态成胶效果及影响因素进行了研究。结果表明， AICPS具有良好延缓成胶特性， AIPS中聚合物分子聚集体呈现稀疏网络结构， AICPS成胶后分子线团尺寸大幅增加， 网络结构变得致密、 粗壮； 随聚合物浓度增加， AIPS和 AICPS渗透率极限值增加； 在岩心驱替实验后续水驱阶段， 与 AIPS压力下降不同， AICPS注入压力先上升后平稳， 表现出独特的渗流特性； 岩心渗透率和聚合物浓度越大， AICPS成胶效果越好； 当聚合物质量浓度为 800、 1500、 2500 和 4000 mg/L 时， 只有对应的储层气测渗透率大于 400×10-3、 800×10-3、 1700×10-3和3500×1-3μm2时， AICPS才可以取得较好的静态成胶效果。图12表 5参18

In order to evaluate the gelling effect of cross-linked polymer solution in reservoir pores objectively and effectively，the viscosity，molecular size and aggregation，permeability limit and static gelling effect of amphion polymer solution（AIPS）and amphion cross-linked polymer solution（AICPS）were studied by using Bush viscometer，dynamic/static laser light scattering，atomic force microscope and core flow experiment. The results showed that AICPS had a good delay gelling characteristics. The molecular aggregated in AIPS showed a sparse network structure，while the molecular size increased significantly in AICPS，and the network structure of AICPS became dense and robust. With the increase of polymer concentration，the permeability limit of AIPS and AICPS increased. In the following water flooding stage，the injection pressure of AIPS flooding dropped，while that of AICPS flooding rose first and then smooth，showing unique characteristics of seepage flow. The greater core permeability and polymer concentration，the better gelling effect of AICPS was. When the concentration of polymer was 800，1500，2500 and 4000 mg/L and corresponding reservoir permeability was greater than 400×10-3，800×10-3，1700×10-3 and 3500×10-3μm2，AICPS could obtain good static gelling effect.

10.19346./j.cnki.1000-4092.2017.04.009