On colmatage of suspensoid and its influence upon flowing states of suspensions in porous media

A correct quantitative estimation of the influence of suspensoid colmatage upon the seeping progress of suspensions in the media is helpful for the reasonable designation of injection technolgy and for controlling the injecting process. The mathematical model describing the colmatage and its influence on seeping behavior of suspensions consists of the three differential equations presented in this paper:transportation equation of suspensoids,kinetic sedimentation equation of suspensoids and flow equation of suspension.The theoretical solution of one-dimensional model for suspensions flowing in porous media resulted by finite difference method respectively at constant flow discharge and constant boundary pressure difference demonstrated that due to colmatage the flowing state of suspensions is always unsteady,and with the change of seeping time the hydraulic gradient increases gradually at constant discharge conditions or the discharge rate decreases gradually at constant boundary pressure difference conditions in the flow field.