低浓度胍胶压裂液有机硼交联剂YJ-P的合成与应用

该文通过考察压裂液的悬砂时间确定了合成反应中硼砂用量、配位剂组分质量比、溶剂组分质量比对有机硼交联剂YJ-P交联低浓度胍胶压裂液携砂性能的影响,并通过动态流变研究压裂体系的黏弹性。结果表明,硼砂质量分数25%(即硼砂质量占交联剂质量的百分数,下同),配位剂m(葡萄糖):m(乙二醇)=1:1.5,溶剂m(丙三醇):m(水)=6:1,交联剂质量分数为1.2%(即交联剂质量占压裂液质量的百分数,下同)时,悬砂性能最优,悬砂时间达到了27 min/mm。确定反应时间4.0 h,反应温度80℃,改性有机硼交联剂对低浓度胍胶压裂液有良好的悬砂性。当胍胶的质量分数达0.2%时,剪切频率增加,动态模量增加,在角频率达10 rad/s时,G'>G″,且G'>0.1 Pa,压裂液有较好的黏弹性。

The synthesis and application of organic boron crosslinker YJ-P for low concentration of guanidine gum fracturing fluids

Through investigating the proppant-carrying time of the fracturing fluid,the optimal content of borax,complexing agent,solvent for preparing the organic boron crosslinker YJ-P were determined.In addition,the viscoelastic property of the fracturing system was studied by means of the dynamic rheology.The results show that,when borax mass fraction was 25%,compound complexing agent mass ratio(m(glucose):m(MEG)) was 1:1.5,mass ratio of glycerol to water was 6:1 and mass fraction of crosslinking agent was 1.2% with low-concentration guanidine gum fracturing fluids,the fracturing system had optimal proppant-carrying performance;the proppant-carrying time reached 27 min/mm.The reaction time was ascertained to be 4.0 h and the reaction temperature to be 80 ℃,the modified organic boron crosslinking agent exhibited the optimal proppant-carrying performance on the low-concentration guanidine gum fracturing fluid.When the minimum mass fraction of guanidine gum reached 0.2%,the dynamic modulus increased with the growth of angular frequency.When the angular frequency was up to 10 rad/s,we got G′>G″,and G′> 0.1 Pa,where the fracturing fluid had optimal viscoelasticity.