氢键型自愈合树脂稳砂体系

基于氢键型自愈合树脂构建具备重复聚砂性能的水乳液型稳砂体系,以渗透率保留率和出砂临界流量为指标,考察乳液稳砂性能。结果表明在130℃条件下,向填砂模型中注入1V_P(V_P为孔隙体积)乳液稳砂剂并养护12 h,砂柱液测渗透率保留率约为76.3%,出砂临界流量大幅度提升至110 mL/min,连续顶替100V_P后,平均出砂速度为0.08 g/L;改性石英微球间具备较强的相互作用及重复聚集能力,重复3次接触—分离过程后,两微球间黏附力仍超过初始黏附力的90%;zeta电位调节作用、支链刷结构及氢键网络结构是砂粒在油/水介质中聚集并形成一定重复聚集强度的重要原因。

Sand consolidation system based on hydrogen-bonding self-healing resin

Sand consolidation emulsion with re-agglomeration property was prepared based on the hydrogen-bonding self-healing resin.Sand consolidation property was then evaluated using regained permeability and the critical sand free rate.It is shown that the regained permeability is about 76.3%and the critical sand free rate could be prominently increased to 110 mL/min when 1V_P(V_P void content)emulsion sand stabilizer was injected in sand-packing model at 130℃for 12 hours.After continuously replacing 100 V_P,the average sand production rate reaches 0.08 g/L.Interaction force and re-agglomeration ability between modified quartz grains are strong.The adhesion force could be more than 90%of the original one after the contacting and separating process proceeded for three times.The electrostatic interaction and the dangling branched chains as well as the hydrogen bonding networks contribute to the aggregated intensity and the re-agglomeration of the sand grains.