Hydraulic oil pump

Abstract

The invention relates to a hydraulic oil pump, which comprises an oil pipe 3, a small pump tube 9, a large pump tube 12, an up pump tube 5, a small plunger piston 7 and a large plunger piston 10, wherein the oil pipe 3, the small pump tube 9 and the large pump tube 12 are sequentially connected in series, the up pump tube 5, the small plunger piston 7 and the large plunger piston 10 are sequentially connected, the up pump tube 5 is arranged in the oil pipe 3, the side wall is provided with a first oil opening a, an inner cavity is provided with a fixed plunger piston 6, the up pump tube 5 makes up-down reciprocating movement outside the fixed plunger piston 6 through power liquid, the small plunger piston 7 makes up-down reciprocating movement inside the small pump tube 9, a second oil opening b is arranged at the joint of the small plunger piston 7 and the large plunger piston 10, the large plunger piston 10 makes up-down reciprocating movement inside the large pump tube 12, the bottom of the large plunger piston 10 is provided with a lower oil outlet valve 11, and the oil extraction is realized through the reciprocating movement of the up pump tube 5, the small plunger piston 7 and the large plunger piston 10 in the oil pipe 3, the small pump tube 9 and the large pump tube 12. The hydraulic oil pump of the invention has the advantages of large range of lower side depth, wideuse range, safety, reliability, long service life, low use cost and the like.

Description

Technical field [0001] The invention relates to a hydraulically driven oil production equipment, in particular to an oil pump suitable for well wall bending deformation oil wells, highly deviated wells and horizontal wells, belonging to rodless oil production equipment. Background technique [0002] Conventional rod-type oil production equipment, although its efficiency is very low, has always been dominant in the world's petroleum industry due to its strong reliability and long service life. In recent years, with the development of drilling and oil production technologies, new conditions have emerged in oilfield production, with an increase in directional and horizontal wells. In addition, due to drilling errors in the early development process of the oilfield and formation creeping in the later production process, some oil well walls were severely bent and deformed, rods and tubes were eccentrically worn, and rods were frequently broken. [0003] For the above situation, the exi...

AI Technical Summary

Problems solved by technology

Traditional rod oil production equipment also has problems. The sucker rod breaks off due to eccentric wear and the tubing leaks due to eccentric wear, which shortens the pump inspection cycle; existing rodless oil production equipment, such as electric submersible pumps, hydraulic piston pumps, jet Pumps, etc. have their own defects that are difficult to overcome, resulting in great limitations in the use of these types of pumps

At present, in the world, there is no oil production equipment with a wide range of lowering depths, a wide range of use, safety and reliability, long service life, and low cost of use to play a leading role in the production of horizontal wells, directional wells, and wells with frequent rod breakage

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