耐盐型悬浮分散聚合物体系的制备及在盐水基变黏滑溜水体系中的应用

通过水溶液聚合体系研制出含双尾疏水单体的两性离子型聚合物分子P-DHZ，黏均分子量达到1000万以上，其具有极佳的耐盐型、减阻性与成胶性，可作为页岩气水力压裂液减阻剂或稠化剂利用高矿化返排液直接配液，耐盐能力可达6×104 mg/L。为满足页岩气压裂现场连续混配的工艺需求，将研制出的P-DHZ制成粉剂，分散于烃类连续相中形成稳定的悬浮体系，并优选出最佳的粉剂粒径、分散剂、转向剂及烃类连续相，制备出可用于现场连续混配的悬浮体系，粉剂比例占体系的45%，在高矿化度返排液中的溶解时间低于30 s，其最高减阻率达到75%以上，并可通过调整浓度实现实时变黏，迅速由滑溜水体系转变为胶液体系。 

Preparation of Salt Tolerant Suspension Dispersion Polymer System and its Application in Brine-based Variable Viscosity Slippery Water System

In this paper, the zwitterionic polymer molecule P-DHZ containing double tailed hydrophobic monomer was developed by aqueous solution polymerization system. Its viscosity average molecular weight is more than 10 million. It owns excellent salt resistance, drag reduction and gelling properties. It can be used as a drag reducer or thickener for shale gas hydraulic fracturing fluid, and can be directly prepared with highly mineralized backflow fluid. Its salt resistance can reach 60 000 mg/L. In order to meet the process requirements of continuous mixing in shale gas fracturing field, P-DHZ powder was prepared and dispersed in hydrocarbon continuous phase to form a stable suspension system. The best powder size, dispersant, diverting agent and hydrocarbon continuous phase were selected to prepare a suspension system for continuous mixing in field. The proportion of powder accounted for 45% of the suspension system, and it can be solved in high salinity back-flow fluid to prepare fracturing fluid without fresh water resource. The maximum drag reduction rate is more than 75%, and the dissolution time is less than 30 seconds. The viscosity can be changed in real time by adjusting the concentration, and the slick-water system can be quickly transformed into the glue system.