Linear submersible lifting unit

Abstract

The invention discloses a linear submersible lifting unit and belongs to the field of mechanical manufacturing of oil extraction equipment. The linear submersible lifting unit comprises a linear submersible lifting power device, a double-acting cylinder plunger pump connected with the linear submersible lifting power device, and a power-assisted balancing device connected with the other end of thelinear submersible lifting power device. The linear submersible lifting power device comprises a stator which is a cylindrical shell, and a promoter which slides axially and linearly inside the stator. According to the linear submersible lifting unit, a novel stator and promoter structure is adopted, so that a low-speed high-thrust power system improves the thrust; in addition, due to the adoption of the double-acting cylinder plunger pump, the two-way oil suction and oil discharge functions can be simultaneously achieved under the two-way action, and the pump efficiency is improved while thedischarge capacity is improved; a sealing cavity of the stator is filled with sealant with high-temperature resistance, high-pressure resistance, good insulating property and good heat conductivity,so that the insulating property of a motor is improved, and the service life of a promoter system is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of oil extraction equipment machinery manufacturing, and relates to a linear submersible oil lifting unit. Background technique [0002] According to the survey, the current beam pumping unit has a large beam volume, low efficiency, high power consumption, and waste of energy; A large number of reactive power operations are formed in the cycle, resulting in a large amount of waste of power consumption, and the system efficiency is only 24%. In addition, due to the decline of underground energy in China, the water content of the oil field reached 89%, and the developed oil fields have entered the stage of extremely high water content; at the same time, due to the oil pumping characteristics of traditional pumping units with rod pumps, the structure is complex, and the eccentric wear of well pipes and rods is no longer good. The method is solved. According to the single wear of a single oil well in a domestic oil field...

AI Technical Summary

Problems solved by technology

[0002] According to the survey, the current beam pumping unit has a large beam volume, low efficiency, high power consumption, and waste of energy; A large amount of reactive power is formed in the cycle, resulting in a large amount of waste of power consumption, and the system efficiency is only 24%.

In addition, due to the decline of underground energy in China, the water content of the oil field reached 89%, and the developed oil fields have entered the stage of extremely high water content; at the same time, due to the oil pumping characteristics of traditional pumping units with rod pumps, the structure is complex, and the eccentric wear of well pipes and rods is no longer good. The method is solved. According to the single wear of a single oil well in a domestic oil field, the cost of replacing the well pipe and rod and maintenance is as much as 30,000 yuan. On the other hand, among the newly developed reserves, low permeability, ultra-low permeability, and tight oil, The special lithology ratio reaches 80%, and the implementation of inclined wells, horizontal wells and large well longitudinal layouts just limits the use of existing traditional equipment

[0003] Moreover, due to the inherent defects in the structure of traditional equipment, it is impossible to achieve a good seal at the wellhead, and the flood area is flooded, which will inevitably produce a large amount of ground oil, which will have an adverse impact on the ground and water surface, especially the "new two Since the promulgation of the Law, frequent leakage accidents of traditional equipment cannot meet the requirements of current laws and regulations

[0004] Based on the above problems, although the current domestic reciprocating submersible electric pump technology has partially solved the problem of low-permeability and small-displacement oil recovery, it has not yet solved the problem of low-stroke, high-thrust and large-displacement; it cannot even meet the current downhole operating conditions. , the non-working frequency of periodic intermittent operation is too high, and the adjustable frequency range of periodic continuous working load is too narrow

Images