长江科学院院报2018，Vol.35Issue(3)：139-143,5.DOI:10.11988/ckyyb.20171089
压裂液黏度对脉冲频率响应机理试验研究
Mechanism of Fracturing Fluid Viscosity in Response to Pulse Frequency
摘要
Abstract
To investigate the changes of rheology of pulse hydraulic fracturing fluid in response to frequency in shale gas exploitation, we conducted pulse shear tests on guar gum of two different viscosities (30 mPa·s and 10 mPa·s) under five different frequencies(0 Hz,1 Hz,3 Hz,5 Hz and 7 Hz). Test results show that the response of fracturing fluids to pulse frequency varies with the change of viscosity. For fracturing fluid of relatively high vis-cosity,as frequency rises, the structural viscosity and plastic viscosity both present downward trend in general;whereas apparent viscosity firstly reduces by shear thinning,and then changes slightly when frequency reaches 5 Hz and even more;the flow index of fracturing fluid declines after increasing to a maximum value at frequency 5 Hz. For fracturing fluid of relatively low viscosity,as frequency rises,viscosity changes more slowly than plastic viscosi-ty does,which is favorable for proppant migration during proppant stage, playing a significant role in stabilizing fractures at the later stage of fracturing. In conclusion,the response of rheological properties of highly-viscous frac-turing fluid to pulse frequency is less obvious than that of lowly-viscous fluid.关键词
压裂液/黏度/脉冲频率/剪切稀释性/流变性/支撑剂Key words
fracturing fluid/viscosity/pulse frequency/shear thinning behavior/rheology/proppant分类
能源科技引用本文复制引用
倪准林,曹函,彭灿威,孙平贺..压裂液黏度对脉冲频率响应机理试验研究[J].长江科学院院报,2018,35(3):139-143,5.基金项目
国家自然科学基金项目(41302124) （41302124）
中南大学中央高校基本科研业务费专项(2017zzts564) （2017zzts564）
