Abstract: We simulate the injection of the gelatin and transfer process of crosslinked polymer in porous medium with long
core equipment. The experiment shows the injected crosslinked polymer can reach the design position. Influenced by dilution，
shearing and adsorption，the concentration and initial viscosity of the crosslinked polymer solution decrease lengthwisely. The
dynamic gel time prolonges to 6 times than the static gel time at the experiment condition（HPAM concentration is 0.2%）.
Compared with the sample viscosities after gelatin and the pressure change before and after plugging at different positions on
the long core，the efficient plugging distance –r is less than the design plugging distance –r′，0.67r′ < r < r′. It also shows that
the sequent water flooding after plugging can drive a few gelatin move into deep reservoir along the high permeability pool，
form the effect of flooding.

Key words: crosslinked polymer, dynamic gelatin behavior, porous medium, plugging, gel