Determination of Minimum Submergence Depth of Rod-Pumped Well By Polymer Flooding

摘要

The produced liquid from producing wells of polymer flooding behaves Non-Newton properties obviously, and the pipe flow and pump inflowing regulation shows a great difference from the general water flooding. It is essential to determine the minimum submergence depth in order to ensure the normal operation of these oil well pumps. In this paper, the calculation methods of pressure drop and pump suction nozzle pressure about the mixture flow in the vertical well bore have been established. According to the pump valve operational principle, the minimum submergence depth determination method has been proposed and the influencing factors also have been analyzed. The research results shows that the rheological property of polymer-bearing produced fluid accord with the power-law mode. The polymer concentration and water content of produced fluid present a great influence on the minimum submergence depth of polymer pumping well. The desirable minimum submergence depth bounds increase as the polymer concentration increases. The smaller the pump diameter, the higher the desirable minimum submergence depth is. The greater the polymer concentration, the larger the desirable ascent rate of minimum submergence depth. With the decrease of liquid production, the desirable minimum submergence depth decreases, and the polymer concentration and water content shows a smaller effect.