疏水缔合羟乙基纤维素水溶液的流变性及驱油性能

Rheological Behavior and Oil Displacing Performance of Hydrophobically Associating Hydroxyethyl Cellulose

研究了疏水缔合改性羟乙基纤维素（BHEC）水溶液的流变性和驱油性能。结果表明,BHEC的临界缔合浓度在4000 mg/L左右,其增粘性能是HEC的近22倍;NaCl对BHEC水溶液有促进作用,当NaCl含量达到100000 mg/L时,BHEC的表观黏度仍然稳定在699.9 mPa.s,说明其具有良好的抗盐性。BHEC水溶液达到临界缔合浓度才具有粘弹性,并随着聚合物浓度的增加,聚合物溶液的粘弹性越显著,振荡频率越高,损耗因子越低。浓度为6000 mg/L的BHEC水溶液可在水驱基础上提高原油采收率25%~32%。

The rheological behavior of hydrophobically associating hydroxyethyl cellulose（BHEC） was studied. The re_suits of rheological property show that the critical aggregation concentration of BHEC is about 4000 mg/L, and its increasing viscosity property is 22 times by HEC; NaC1 can promote BHEC solution, when the concentration of NaC1 reaches 100000 mg/L, the apparent viscosity of BHEC remains stably at 699.9 mPa·s, so BHEC has good salt-tolerance property. BHEC achieves the certain concentration to have viscoelastic property, and with the polymer concentration increasing, the viscoelastic property of polymer solution is significantly increased. Simultaneously, the higher the oscillation frequency, the lower loss factor. When the concentration of BHEC is 6000 mg/L, the oil recovery factor of BHEC is improved 25 % --32 % after water flooding.