Gelling behavior of HPAM/Cr(III) under the shearing of porous media

The gelling behavior of HPAM/Cr(Ⅲ) under static and dynamic conditions is researched using ampoule bottles and sand packs,and the results show that,its initial gelation time and final gelation time under the dynamic conditions in porous media are 1~3 times and 1~3.5 times separately as long as those under the static conditions in porous media.Its initial gelation time and final gelation time under the static conditions in porous media are 1~2 times and 3~5 times separately as long as those under the static conditions in ampoule bottles.The initial gelation time and the final gelation time of HPAM/Cr(Ⅲ) are delayed and the plugging capacity after gelling declines with the increase of shearing velocity and the increase of the shearing effect.They are also delayed and the strength after gelling is increased with the increasing of polymer and crosslinker concentration.The main cause leading to the increase of water injection pressure is the gelling of HPAM/Cr(Ⅲ) in porous media but not the adsorption and trapping effects of polymer molecule.