乳化热固性树脂体系构建及其封堵性能评价

Construction and plugging performance evaluation of emulsified thermosetting resin system

随着高温(储层温度130℃)裂缝油藏开展水驱作业,注入水沿裂缝窜进问题日益突出。环氧树脂高温条件下固化后具有强度高、耐老化的特点,是一种有潜力的高温堵剂。针对环氧树脂不易注入、潮湿条件下难固化的问题,采用相反转法乳化环氧树脂,初选多种乳化剂分别以自来水和模拟地层水为水相,对环氧树脂E-44进行乳化,筛选出同时适用于两种水相的乳化剂;然后进行单因素实验,分别研究搅拌速度、乳化温度、加水速度、乳化剂质量分数、油水体积比工艺因素对环氧树脂相反转过程及乳状液性能的影响;最后采用正交试验综合分析各因素的影响水平并确定较优乳化工艺参数,建立乳化体系。差示扫描量热实验结果表明,该体系的固化温度为129.5℃,在储层温度下固化后具有良好的封堵效果。

With the development of water flooding in fractured reservoirs with high temperature( reservoir temperature of 130 ℃),the problem of fracture channeling by water injected becomes more and more prominent.Epoxy resin has the characteristics of high strength and aging resistance after curing at high temperature,which is a potential high-temperature plugging agent.Since epoxy resin is not easy to be injected and difficult to cure under wet conditions,the epoxy resin was emulsified by the phase inversion method.A variety of emulsifiers were selected to emulsify epoxy resin( E-44) with tap water and simulated formation water as the water phase,and the emulsifiers suitable for both kinds of water were screened out.Then single-factor experiments were carried out to study the effects of stirring speed,emulsifying temperature,water adding speed,mass fraction of emulsifier,and oil-water volume ratio on the phase inversion process of epoxy resin and the properties of emulsion.Finally,the orthogonal experiment was used to analyze the level of each factor and determine the optimal emulsifying process.The results of differential scanning calorimetry showed that the curing temperature of the system was 129.5 ℃,and it had good plugging effect after curing at reservoir temperature.