适用于低渗透储层的有机硼胍胶压裂液体系的制备与性能评价

Preparation and Performance Evaluation of Organic Boron Guanidine Gum Fracturing Fluid for the Low Permeability Reservoir

常规胍胶压裂液胍胶加量大、破胶后残渣含量高,影响了低渗透储层的渗流能力。为改善这一问题,用硼酸、葡萄糖酸钠、三乙醇胺等制得有机硼交联剂JS-8,研究了JS-8、改性胍胶HPG-1和非离子型助排剂ZA-07组成的低浓度胍胶压裂液的各项性能。结果表明,该压裂液体系交联时间可调,抗温抗剪切性能较好,在80℃、170 s^(-1)下剪切持续90 min的黏度一直保持在218 mPa·s左右;破胶时间短,2 h内可完全破胶,破胶液黏度与残渣含量低、界面张力仅为1.07 mN/m,极大地降低了储层水锁伤害,压裂液对储层的平均渗透率伤害率仅为19.25%,可用于低渗透储层的压裂改造。图4表3参19。

The dosage of guar gum in conventional guar gum fracturing fluid is large,and the residual content is high after gel breaking,which affects the percolation capacity of low permeability reservoir.In order to improve the problem,the organic boron crosslinking agent JS-8 was synthesized by boric acid,sodium gluconate and triethanolamine,etc.The properties of low concentration guanidine gum fracturing fluid composed of JS-8,modified guanidine gum HPG-1 and non-ionic additive ZA-07 were studied.The results showed that the crosslinking time of the fracturing fluid system was adjustable,and the temperature tolerance and shearing resistance were excellent.The viscosity remained 218 mPa·s after shearing 90 min at 170 s-1 and 80℃.The gel breaking time of fracturing fluid was short,which could be completely broken within 2 h.The viscosity of gel breaking liquid and residue content were low,and the interfacial tension was only 1.07 mN/m,which greatly reduced water lock damage of the reservoir.The average permeability damage rate of the fracturing fluid was only 19.25%.The low concentration guanidine gum fracturing fluid could be used for the fracturing reformation of low permeability reservoir.