Technological Features of Well Equipment Work under Production of Oils with Increased and High Viscosity

Abstract

Fields with hard-to-recover reserves include formations with small oil-saturated thickness, low-permeable reservoirs and formations with great depth of occurrence. Oil recovery from these fields is entailed by premature failures of well equipment. To increase technological efficiency of production of high-viscous oils of the well stock equipped with walking beam pumping unit (WBPU) it is proposed to use sucker-rod pump with an external weighting agent. Introduction of this type of pumps will allow increasing the value of minimum load on sucker-rod string during its downward stroke, which will reduce the value of amplitude loads. Additional load, created by external weighting agent, will prevent the rod string from hovering due to high hydrodynamic friction forces caused by the increased and high viscosity of the pumped fluid. The technological efficiency of introducing this pump in wells with WBPU is demonstrated. Calculations made allow us to determine necessary weight of heavy bottom according to viscosity of the produced fluid.