两亲性嵌段聚合物稠油降粘剂的合成与性能评价

稠油降粘冷采是一种重要的稠油开采方式。本工作设计并合成了一种两亲性嵌段聚合物降粘剂HPAM/AOS。该降粘剂具有较高的表面活性,且其亲水嵌段中含有大量极性基团,使其同时具有较强的乳化能力及稠油亲和性,从而有效提高了降粘效果。利用旋滴界面张力仪、电稳定性测定仪及激光粒度分析仪等测定了降粘剂对稠油的乳化能力,通过Zeta电位仪测定降粘剂对稠油的亲和性。结果发现,与HPAM相比,HPAM/AOS油水界面张力降低了98.2%,达0.007 mN.m^-1；破乳电压提高了104.9%,达420 V。与AOS相比,HPAM/AOS稠油乳液Zeta电势绝对值降低了75.3%,为-17.8 mV,具有更强的稠油亲和性。总体上,与HPAM及AOS相比,HPAM/AOS稠油降粘率分别提升了74.2%及48.7%,降粘效果明显。

Synthesis and performance evaluation of amphiphilic block polymer viscosity reducer for heavy oil

Cold recovery by viscosity reduction is an important method as for heavy oil exploitation. In this work, a kind of amphiphilic block polymer viscosity reducer HPAM/AOS was synthesized. As well as high surface activity, a large number of polar groups in hydrophilic blocks impose it strong emulsifying ability and heavy oil affinity, thus to improve the viscosity reduction effect effectively. Meanwhile, the emulsifying ability of HPAM/AOS for heavy oil was determined by spinning drop interfacial tensiometer, electrical stability tester and laser particle size analyzer, accompanied by Zeta potentiometer for affinity information. To be specific, compared with HPAM, the oil-water interfacial tension of HPAM/AOS emulsion decreased by 98.2% to 0.007 mN.m^-1, and the demulsification voltage increased by 104.9% to 420 V. Furthermore, in comparison with AOS, the absolute potential of HPAM/AOS emulsion Zeta is reduced by 75.3% to -17.8 mV, proving its more affinity to heavy oil. Generally, the viscosity reduction ratio of HPAM/AOS is increased by 74.2% and 48.7% respectively compared to HPAM and AOS, showing its good treatment efficiency.