Some method applied to determine frequency of sand plugs washing in oil wells
In order to determine a rational frequency of repairs associated with washing of sand plugs in oil wells, the article presents the results of solution of the stationary hydrodynamic problem of filtration of Newtonian incompressible oil in the "circular pool - sand plug" system at the well bottom. To determine the thickness of a sand plug that is being formed when working with a sucker rod pumping unit, I.I. Aliev’s method, presented in the literature, is used. The depth of fluid dynamic level and oil and water flow rates of the wells under study were measured during different time periods between plugs washing. Monetary costs associated both with sand plugs washing and oil production losses at different frequency of repairs are defined. The graph summarizing monetary losses due to repairs frequency is built on the basis of these data. These studies resulted in making a conclusion that the rational frequency of repairs associated with sand plugs washing equals to six repairs per year.