Small power deep well pumping unit

Abstract

The invention discloses a small power deep well pumping unit, and the small power deep well pumping unit comprises a turbine pump and a vane pump, the circulating fluid outlet of the turbine pump is connected with the inlet of the vane pump through a pipeline, the outlet of the vane pump is connected with the circulating fluid inlet of the turbine pump through a pipeline, a closed circulating channel is formed between the turbine pump and the vane pump and filled with the circulating fluid, the rotary shaft of the vane pump is connected with the output shaft of a driving motor, the rotary shaft of the turbine pump is connected with the rotary shaft of a screw pump, an oil pumping port is formed at the lower end of the screw pump while the upper end of the screw pump is connected with an oil discharge pipeline. The small power deep well pumping unit has remarkable result that no reversing abrasion is generated; the oil can be pumped in a small power; the oil well liquid column load is raised by hydraulic pressure, the impact and vibration load of the walking beam rod string are not generated and energy-saving effect is achieved; the length of the screw pump can be changed for increasing the pressure without limit on the supercharging area ratio, the lift of pump is raised by hydraulic pressure supercharging operation and the high lift of pump deep well oil pumping can be realized.

Description

technical field [0001] The invention relates to the technical field of mechanical equipment for petroleum exploitation, in particular to a low-power deep well pumping unit. Background technique [0002] At present, pumps used in petroleum development are generally divided into two types: rod pumps and rodless pumps. Because rodless pumps are heavily invested and the scope of use is greatly limited, most oil wells now use rod pumps for mining. [0003] In the prior art, most rod pumps are reciprocating plunger pumps. The rotary motion of the motor is converted into the up and down reciprocating motion of the hydraulic cylinder through the reversing valve, so that the oil is pumped out through the plunger pump to complete the oil extraction in the oil well. However, the pressurization of the hydraulic cylinder is limited by the area ratio, and it cannot be made large in oil wells, so its head is low and cannot be applied to deep well pumping; the reversing valve frequently wor...

AI Technical Summary

Problems solved by technology

However, the pressurization of the hydraulic cylinder is limited by the area ratio, and it cannot be made large in oil wells, so its head is low and cannot be applied to deep well pumping; the reversing valve frequently works in circular directions, and the wear is serious, which accelerates the damage of the pump speed, which shortens the service life of the pump and affects production efficiency; the formation of the plunger pump is limited, and the short working period (2-4 months) is not conducive to increasing oil production

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