【摘要】 鉴于早期VES压裂液在现场应用中存在的问题,制备了VES-SL黏弹性表面活性剂压裂液并研究了其流变性。VES-SL黏弹性表面活性剂由SL表面活性剂和助剂Ⅰ合成,SL表面活性剂烃基结构对VES-SL压裂液黏度的影响较小,SL表面活性剂的浓度较低时,VES-SL压裂液仍然保持较高的黏度,助剂Ⅰ的使用可以明显提高VES-SL压裂液的黏度,无机盐在一定浓度范围内对压裂液有增黏作用。VES-SL压裂液的抗热降解和剪切降解的能力强于HPG压裂液,且具有很好的流动性。实验结果表明,该压裂液黏度高、成本低,对岩心基质伤害率低,因此,其性能明显优于HPG压裂液。胜利油田营543区块现场试验效果对比表明,VES-SL压裂液的性能明显优于HPG压裂液,取得了良好的增油效果。图6表2参11更多还原

【Abstract】 To solve the problems of VES fracturing fluids,VES-SL fracturing fluid was developed and its rheological property was studied.VES-SL system consists of two main components,SL surfactant and additive I.The viscosity of VES-SL fracturing fluid is less affected by the alkyl structure changes of the SL surfactant.At low concentrations,VES-SL system can still have a relatively high viscosity.The viscosity of VES-SL system can be improved by using additive I,the inorganic salt is conductive to increasing the cohesiveness of fracturing fluid in a certain concentration.VES-SL system is superior to HPG fracturing fluid in anti-degradation and shearing strength,and has better mobility.Experiments show that the VES-SL system exhibits a high viscosity,low cost,and low damage to core matrix.The field tests in Block Ying-543 in Shengli Oilfield reveal that the property of VES-SL system is better than that of HPG fracturing fluid.The system increases oil production.更多还原