驱油型可回收清洁压裂液的研制与应用
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摘要
针对在压裂施工中大量使用的胍胶液体系存在回收利用工艺复杂、成本高、效率低等问题,制备了以近肽链结构的黏弹性表面活性剂为主要成分的高效驱油清洁压裂液体系,研究了压裂液的耐温耐剪切性、抗盐、破胶及驱油性能,并在陇东油田进行了现场应用。结果表明,该压裂液耐温90℃,抗盐可达100 g/L,在压裂液中加入有机酸调节剂可降低配液水矿化度对压裂液黏度的影响。压裂液的携砂性能良好,破胶彻底,破胶液残渣含量为2 mg/L,破胶液与煤油的界面张力可达10-2数10-3m N/m。该压裂液在油田现场成功应用25井次,单井产量是相临井产量的6倍。压裂液返排液经分离沉降等简单处理后即可再次配制压裂液,末端返排液处理后用于驱油,可在水驱基础上平均提高采收率10.67%,大幅降低压裂液对环境的污染。
In order to solve the problems of hard recycling,high cost,inefficiency of guar gum fracturing fluid,an efficient oil-displacement clean fracturing fluid system with near peptide chain structure viscoelastic surfactant as main component was prepared. The performances of temperature and shear resistance,salt tolerance,gel breaking and oil displacement of this fracturing fluid were studied. Finally,it was applied in Longdong oilfield. The results showed that the fracturing fluid had good temperature resistance(90℃)and salt tolerance(100 g/L). The addition of organic acid regulator in fracturing fluid could reduce the effect of water salinity on the viscosity of fracturing fluid. The fracturing fluid had good sand carrying property and broke gel thoroughly with 2 mg/L residue content. The interfacial tension between broken fluid and kerosene could reach 10-2—10-3 mN/m. The fracturing fluid had been successfully applied to 25 wells in oilfield,and the output of single well was 6 times than that of adjacent wells. The fracturing fluid could be prepared again after simple treatment such as separation and sedimentation,and used for oil displacement after end-effluent treatment. The oil recovery rate increased by 10.67% on average on the basis of water flooding. The environmental pollution caused by fracturing fluid could be greatly reduced.
In order to solve the problems of hard recycling,high cost,inefficiency of guar gum fracturing fluid,an efficient oil-displacement clean fracturing fluid system with near peptide chain structure viscoelastic surfactant as main component was prepared. The performances of temperature and shear resistance,salt tolerance,gel breaking and oil displacement of this fracturing fluid were studied. Finally,it was applied in Longdong oilfield. The results showed that the fracturing fluid had good temperature resistance(90℃)and salt tolerance(100 g/L). The addition of organic acid regulator in fracturing fluid could reduce the effect of water salinity on the viscosity of fracturing fluid. The fracturing fluid had good sand carrying property and broke gel thoroughly with 2 mg/L residue content. The interfacial tension between broken fluid and kerosene could reach 10-2—10-3 mN/m. The fracturing fluid had been successfully applied to 25 wells in oilfield,and the output of single well was 6 times than that of adjacent wells. The fracturing fluid could be prepared again after simple treatment such as separation and sedimentation,and used for oil displacement after end-effluent treatment. The oil recovery rate increased by 10.67% on average on the basis of water flooding. The environmental pollution caused by fracturing fluid could be greatly reduced.
引文
[1]董景锋,汪志臣,怡宝安,等.低浓度胍胶压裂液体系的研究与应用[J].油田化学,2017:34(1):43-47.
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[4]曹绪龙,王得顺,李秀兰.孤岛油田西区复合驱界面张力研究[J].油气地质与采收率,2001,8(1):64-66.
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[9]林波,刘通义,赵众从,等.抗高温无残渣压裂液的研究与应用[J].钻井液与完井液,2012,29(5):70-73.
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[11]孙晓,王树众,白玉,等. VES-CO2清洁泡沫压裂液携砂性能实验研究[J].工程热物理学报,2011,32(9):1524-1526.
[12]刘平礼,兰夕堂,李年银,等.酸预处理在水力压裂中降低伤害机理研究[J].西南石油大学学报(自然科学版),2016,38(3):150-155.
[13]吴玉娜,丁伟,江依昊.两性表面活性剂有效物含量的测定方法研究进展[J].化学工业与工程技术,2014,35(1):61-63.
[14] YANG Jiang,YANG Zhen,LU Yongjun,et al. Rheological properties of zwitterionic wormlike micelle in presence of solvents and cosurfactant at high temperature[J]. J Dispersion Sci Technol,2013,34(8):1124-1129.
[2]埃克诺米德斯著,张保平译.油藏增产措施(第三版)[M].陕西:石油工业出版社,2002:102-115.
[3]乔孟占,赵娜,赵英杰,等.双阴离子型表面活性剂的合成与驱油效果[J].油田化学,2017,34(1):113-118.
[4]曹绪龙,王得顺,李秀兰.孤岛油田西区复合驱界面张力研究[J].油气地质与采收率,2001,8(1):64-66.
[5]肖啸,宋昭峥.低渗透油藏表面活性剂降压增注机理研究[J].应用化工,2012,41(10):1796-1798.
[6] ADIBHATLA B,MOHANTY K. Oil recovery from fractured carbonates by surfactant-aided gravity drainage:laboratory experiments and mechanistic simulations[J]. SPE Reserv Eval Eng,2008,11(1):119-130.
[7] LEVITT D B,JACKSON A C,BRITTON L N,et al. Identification and evaluation of high-performance ERO surfactant[R]. SPE100089,2006.
[8]何静,王满学,洪玲.一种适合延长低渗油田的水基威兰胶压裂液体系研究[J].钻采工艺,2017,40(1):92-96.
[9]林波,刘通义,赵众从,等.抗高温无残渣压裂液的研究与应用[J].钻井液与完井液,2012,29(5):70-73.
[10]周成裕,陈馥,黄磊光,等.一种高温抗剪切聚合物压裂液的研制[J].钻井液与完井液,2008,25(1):68-72.
[11]孙晓,王树众,白玉,等. VES-CO2清洁泡沫压裂液携砂性能实验研究[J].工程热物理学报,2011,32(9):1524-1526.
[12]刘平礼,兰夕堂,李年银,等.酸预处理在水力压裂中降低伤害机理研究[J].西南石油大学学报(自然科学版),2016,38(3):150-155.
[13]吴玉娜,丁伟,江依昊.两性表面活性剂有效物含量的测定方法研究进展[J].化学工业与工程技术,2014,35(1):61-63.
[14] YANG Jiang,YANG Zhen,LU Yongjun,et al. Rheological properties of zwitterionic wormlike micelle in presence of solvents and cosurfactant at high temperature[J]. J Dispersion Sci Technol,2013,34(8):1124-1129.