预交联凝胶微球堵漏剂的性能评价

Performance Evaluation of Pre-formed Gel Microsphere Plugging Agent

李小瑞 张 宇 杨 南

LI Xiaorui ZHANG Yu YANG Nan

为解决裂缝性地层的漏失问题， 以丙烯酰胺为单体、 过硫酸钾为引发剂、 JL-2为化学交联剂、 锂皂石为物理交联剂、 SP-80为分散剂、 航空煤油为油相， 采用反相悬浮法制备了一种耐剪切的预交联凝胶微球堵漏剂 WQ-5，利用激光粒度分析仪评价 WQ-5吸水前后的粒径分布， 并研究了堵漏剂 WQ-5的吸水膨胀性能的影响因素和耐剪切性能， 采用高温高压失水仪砂床实验评价了 WQ-5的堵漏承压性能。结果表明： 制备出的预交联凝胶微球堵漏剂 WQ-5 为球形颗粒， 初始平均粒径为 184.5 μm， 在 20℃、 1%NaCl 水溶液中膨胀 24 h 后的粒径为 450.5μm；WQ-5的膨胀倍数与温度、 矿化度和 pH值有关， 温度越高、 矿化度越小、 pH值越大， 预交联凝胶微球的膨胀倍数越高； 该堵漏剂具有良好的堵漏承压性能。图8参12

Aiming at the fractured leakage reservoirs，a new kind of shearing-resistant pre-formed gel microsphere plugging agent WQ-5 was synthesized by inverse suspension polymerization，using Span80 as the emulsifiers，potassium persulfate as initiator， acrylamide，as comonomer，JL-2 as the chemical crosslinker and hectorite as the inorganic crosslinker. The particle size distributions of WQ-5 before and after swelling were evaluated by use of laser particle size analyzer. The effects of swelling property and shearing-resistant were also evaluated. The plugging property of WQ-5 was also evaluated by HTHP Dynamic Filtration Press plugging experiment. The results showed that the initial average particle size of synthesized pre-formed gel microsphere plugging agent was of 184.5 μm. The average particle size after swelling was of 450.5 μm in 1%NaCl solution at the temperature of 20℃. The expansion ratio of WQ-5 was related to temperature，salinity and pH value，the lower sanity and the higher temperature and pH value，the better swelling property of plugging agent. The plugging agent had good plugging and bearing ability.

10.19346/j.cnki.1000-4092.2016.04.003