Abstract: This invention is an oil-well pumping unit. It may be used for production of stratum fluids from marginal well stock at large depths. The invention increases reliability and improves power performance by including a fully integrated plunger pump fitted with discharge valves and a gravity gas separator, non-return valves, and a coupling for fastening the oil-well pumping unit to flow tubing. The downhole linear motor is mounted below the plunger pump. A slider upstroke damper and a slider down-stroke damper, as well as a telemetry unit, are mounted below the linear motor. The unit is linked to a ground-based control unit through a neutral wire interconnected with linear motor windings. The ground-based control unit may be designed as a three-phase high-frequency inverting controller and output transformer, and is connected to the downhole linear motor through an insulated three-wire cable.

Abstract: This invention concerns oil production, particularly, units fitted with linear downhole motor driven displacement pumps and may be used for production of stratum fluids from marginal well stock at large depths.