A design method of optimising compatibility of polymer flooding system with reservoir

Based on theory research and experimental studies, a design method of optimising the compatibility between hydrodynamic characteristic size of polymer and reservoir under the pressure gradient of formation displacement has been proposed. Then, the matching relation plate between polymer and reservoir was obtained by defining reference standard of the compatibility between chemical system and reservoir. For the purpose of this study block, with converting formation velocity into 0.3 m/d as the flow performance reference standard, average pore throat radius is determined the core size is more than 6.6 times of the polymer system hydrodynamics characteristics, as the compatibility of polymer system and reservoir boundaries By explaining the phenomena why some oil displacement system was easily injected but difficult to flow in formation, accurately provided an important basis and technical support for selecting the appropriate polymer. The research considered the pressure gradient difference between the near wellbore and deep formation.