SUCKER-ROD PUMP UNIT

摘要

oil producing industry; recovery of viscous oils. SUBSTANCE: unit has pump with two-step cylinder accommodating two hollow plungers of different diameters intercoupled to form working chambers. Lower step of plunger is provided with weight arranged outside the pump lower than its intake part. Lower step has larger diameter on length equal to length of plunger stroke. Hydrodynamic losses are reduced owing to provision of synchronous movement of pumped out liquid and sucker-rod string at upwards movement and elimination of hanging up of sucker-rod string at downwards movement. EFFECT: improved reliability of sucker-rod pump unit. 1 dwg