The physicochemical mechanism and mathematical model of the pseudo-four-phase flow in the movable gel system

The movable gel system (MGS) has the dual function of "regulation" and "flooding", which has been carried out in a large number of pilot test and industrial application. Laboratory experiments and field test results show that approximate solid particles exist in MGS which is different from the aqueous phase and have the seepage characteristics of "blocking but never shutting off", the micro reason is the presence of movable gel transform into gel particles. Therefore, this paper divided MGS into two parts of movable gel and gel particles, and we established mathematical model of the pseudo-four-phase flow for MGS, built relatively comprehensive characterization methods for MGS; the gel particles are regarded as separate phase which differ from the oil, gas and water phase, we proposed the pseudo-four-phase flow model and the method for the treatment of the relative permeability of the pseudo-four-phase flow. The new pseudo-four-phase seepage mathematical models is closer to the actual field seepage characteristics and improve the accuracy of the results for MGS simulation, this is an important work of scientific guidance for the industrial promotion of MGS. (paper)