Abstract: At present, new soft movable micro-gel (SMG) depth profile control has become one of the important EOR techniques for old oilfields. By lab displacement experiment, the percolation mechanism of SMG system in porous medium is studied, the percolation model is developed, the equation analytical solution is given. The effective filtrating factor is defined as characterizing factor of SMG system. The model's parameters are analyzed systematically. The research shows that the results could have methodological and theoretical reference values on the analysis and calculation of injection concentration distribution and injection pressure variation and the determination of effective range of SMG solution in porous medium.

Key words: new soft movable micro-gel (SMG), depth profile control, percolation behavior, filtrating factor