表面活性剂压裂液机理与携砂性能研究

RESEARCH ON MECHANISM AND SAND-CARRYING PERFORMANCE OF THE SURFACTANT FRACTURING FLUID

用透射电镜和扫描电镜等多种实验手段,结合表面活性剂溶液的基础理论,通过对表面活性剂内外在宏观与微观关联性质的分析,研究并基本认清了表面活性剂压裂液的成胶机理和破胶机理;论证了表面活性剂压裂液以弹性携砂为主的机理,提出了用悬浮切力来表征表面活性剂压裂液携砂性能的新方法。实验结果表明:在100 s?1的剪切速率下,胍胶压裂液和表面活性剂压裂液最低携砂黏度分别为100 mPa.s和30 mPa.s,在同样剪切速率下表面活性剂压裂液的最低携砂黏度比胍胶压裂液小得多。

By applying experimental methods of transmission and scanning electron microscopy and the basic theoryof surfactant solution,the relevance of surfactant inhesion and extrinsic in macroscopic and microscopic of surfactantare analyzed,and the gel forming mechanism and the gel breaking mechanism are investigated.The mechanism ofsurfactant fracturing fluids carrying sand mainly by elastic is demonstrated,and we put forward the new methodby using suspending shear force to indicate the sand-carrying capacity of surfactant fracturing fluid.The resultsof experiment indicate that the minimum sand-carrying viscosity are 100 mPa·s and 30 mPa·s in the same 100s??1shear rates for guanidine gel fracturing fluid and surfactant fracturing fluids;in the same shear rate,minimum sandcarryingviscosity of surfactant fracturing fluid is much smaller than guanidine gel.The above research results enrichthe correlate knowledge in theory,and it helps surfactant fracturing fluid application.