Oil well pump

Abstract

An oil well subsurface pump comprising a housing for reciprocal disposition with a working barrel and having one end thereof adapted to be secured to the lowermost end of a sucker rod, or the like, and the opposite end thereof in open communication with the fluid reservoir in a well bore, a ball check valve carried by the housing and disposed within a ball chamber having a stop at one end for limiting the movement of the ball member in one direction and the opposite end open to the well fluid, resilient sealing assemblies interposed between the outer periphery of the housing and the inner periphery of the working barrel and slidable with respect to the barrel during a pumping operation, longitudinally disposed passageways provided in the housing and extending from the ball chamber to a position beyond the upper limit of the sealing assemblies to provide communication through the housing to the annulus between the housing and the working barrel for passage of the well fluid from the fluid reservoir to the annulus for transportation of the fluid to the surface of the well bore, the sealing assemblies being superimposed with respect to one another and each comprising an inner rigid ring having a yieldable annular body disposed therearound with a fluid channel therebetween such that the yieldable annular body is engagable with the inner periphery of the working barrel and is provided with an annular fluid receiving groove on the outer periphery thereof for assuring an adequate lubrication between the sealing assemblies and the working barrel for reducing friction therebetween during a pumping operation, and wherein fluid pressure to the fluid channel expands the yieldable body into sealing engagement with the working barrel.