Velocity Distribution For The Flow Of Newtonian Fluid In Concentric Annulus With Isometric Ring Slots On The Inner Cylinder

It is effective to apply the seperated layer polymer injection technology on oil development in Daqing Oilfield. The technology of separated layer polymer injection realized by injection allocation with concentric ring depressurization slots is an important technical way which can help polymer injection and cost control. Flow of polymer aqueous solution in injection allocation with concentric ring depressurization slots can be regarded as the flow of Newtonian fluid in concentric annulus with isometric ring slots on the inner cylinder approximately. The research on the flow of Newtonian fluid in concentric annulus with isometric ring slots on the inner cylinder can provide a theoretical base on the optimization of the working parameters for the technology of the single string separated layer polymer injection with concentric ring depressurization slots on the string, which is of engineering importance.The governing equations for the flow of the Newtonian fluid in the concentric annulus with isometric ring slots on the inner cylinder under the cylindrical coordinate system are established, and the corresponding numerical methods are presented in this paper. Taking water as examples, the velocity of the flow are numerically calculated, and the influences of slot width, slot depth, slot interval and slot number on the velocity distribution are analyzed, respectively. The results show that as to the flow of the Newtonian fluid in concentric annulus with isometric ring slots on the inner cylinder, the influences of slot width and slot depth on the velocity distribution are obvious, while the influences of slot interval and slot number on it are not obvious.