孔隙介质对HPAM交联性能的影响

聚合物溶液在通过孔隙介质时产生的剪切降解作用与流速有关,流速越大,剪切降解越严重。流经孔隙介质后的聚合物溶液的阻力系数和残余阻力系数明显低于原始聚合物溶液,交联效果也明显差于原始聚合物,产生弱交联需要更高的聚合物浓度和交联剂浓度。因此在室内评价调剖剂性能时,应考察在一定流速下流经孔隙介质后的聚合物的交联情况。同时也说明,聚合物驱产出液中的聚合物在一定条件下可以通过弱交联技术实现增粘回注。

EFFECTS OF POROUS MEDIA ON THE GELLING PERFORMANCE OF HPAM

Mechanical degradation of HPAM happens during it flows through porous media, and the degradation increases with flow velocity. The flow resistance and residual resistance of polymer solution that has passed through porous media is remarkably lower than that of fresh polymer solution, and its gelling performance is weaker than fresh polymer solution. Higher polymer and cross-linker concentration is needed for gelling. The gelling performance experiments of polymer solution that produced from core flooding experiment should be conducted when evaluating the profile modifier. Laboratory results show that the polymer solution produced from production wells in polymer flooded reservoir can be re-injected after increasing its viscosity by using weak-gel technique.