黏弹性表面活性剂压裂液流变性研究
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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
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.
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.
引文
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[4]杨丙秀,蒋廷学,丁云宏,等.低孔低渗储集层探井低伤害压裂技术研究与应用[J].石油勘探与开发,2005,32(2):119-122.
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[7]李勇明,郭建春,赵金洲,等.裂缝性气藏压裂液滤失模型的研究及应用[J].石油勘探与开发,2004,31(5):120-122.
[8]张坚平,牛瑞云.深层稠油难动用储量压裂增产技术研究与试验[J].石油勘探与开发,2004,31(6):112-114.
[9]刘继民,刘建中,刘志鹏,等.用微地震法监测压裂裂缝转向过程[J].石油勘探与开发,2005,32(2):75-77.
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[11]宋付权.低渗透油藏注水开发的水突进特征[J].石油勘探与开发,2005,32(3):106-108.
[2]Hughes T,Jones T,Tustin G.Viscoelastic surfactant basedgelling composition for wellbore service fluids[P].USA:6 232274,2001-05-15.
[3]Jones T,Tustin G.Mixed viscoelastic surfactant gel system[P].China:GB 2 332 224,2000-06-19.
[4]杨丙秀,蒋廷学,丁云宏,等.低孔低渗储集层探井低伤害压裂技术研究与应用[J].石油勘探与开发,2005,32(2):119-122.
[5]李阳,曹刚.胜利油田低渗透砂岩油藏开发技术[J].石油勘探与开发,2005,32(1):123-126.
[6]陈红军,郭建春,赵金洲.压裂裂缝伤害室内模拟实验及裂缝清洗酸化工艺的应用[J].石油勘探与开发,2004,31(4):136-138.
[7]李勇明,郭建春,赵金洲,等.裂缝性气藏压裂液滤失模型的研究及应用[J].石油勘探与开发,2004,31(5):120-122.
[8]张坚平,牛瑞云.深层稠油难动用储量压裂增产技术研究与试验[J].石油勘探与开发,2004,31(6):112-114.
[9]刘继民,刘建中,刘志鹏,等.用微地震法监测压裂裂缝转向过程[J].石油勘探与开发,2005,32(2):75-77.
[10]李勇明,郭建春,赵金洲.裂缝性油藏压裂井产能数值模拟模型研究与应用[J].石油勘探与开发,2005,32(2):126-128.
[11]宋付权.低渗透油藏注水开发的水突进特征[J].石油勘探与开发,2005,32(3):106-108.
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