Manual low-pressure pump

Abstract

The invention relates to the technical field of oil field and oil well drilling and production, in particular to a manual low-pressure pump. The manual low-pressure pump comprises a hydraulic cylinder, a piston rod, a piston, a first steel ball, a spring, an internal hexagonal nut, a second steel ball, a cam, a handle and a hydraulic cylinder cover; the handle is connected with one end of the cam;the cam is hinged to the upper part of the piston rod; one side of the cam is hinged with a support rod; the support rod is fixed on the hydraulic cylinder cover; the hydraulic cylinder cover is fixed at the upper part of the hydraulic cylinder; the piston rod is connected with the piston; a liquid discharge hole and a liquid inlet hole communicating with the hydraulic cylinder are formed in thebottom of the hydraulic cylinder; an upper step table is arranged in the liquid discharge hole; the lower part of the first steel ball is connected with the spring; and the internal hexagonal nut fixes the spring in the liquid discharge hole from the lower part of the hydraulic cylinder. The device is simple in structure, adopts two steel balls to alternately block the liquid discharge hole and the liquid inlet hole, adopts a ball sealing mode to greatly improve the sealing effect, and effectively improves the working efficiency of the manual low-pressure pump.

Description

Technical field [0001] The invention relates to the technical field of oil field oil well drilling and production, in particular to a manual low-pressure pump. Background technique [0002] Oil well casing leaks due to cementing quality, connection threads, formation movement, rust and other reasons, which brings unfavorable factors to the construction of oil wells and affects crude oil production. Once the non-producing layer of the oil well is leaking, the loss point must be determined before the repair is implemented. The current method of verifying the missing point of the casing generally uses a packer to close the annulus of the oil casing above the pay zone and pressurize the casing. Verify the casing. However, several existing packers have unfavorable factors to varying degrees in the implementation of the inspection and construction process of the packers, resulting in unsmooth construction and inability to accurately determine the missing position. [0003] At present, ...

AI Technical Summary

Problems solved by technology

However, for staged fracturing of horizontal wells, the working position of the expansion packer is in the horizontal open-hole section. The bottom hole situation is complex and the formation pressure is high. Due to the effect of formation pressure during the running process, it is easier to set the seal in advance, which brings many problems to the construction. Inconvenient, at the same time, due to the uneven formation of the open hole section, if the sealing rubber cylinder is too short, the sealing performance will be poor and the setting will not be complete, which will affect the later fracturing operation

[0004] The above work requires the use of a manual low-pressure pump for pressure. The existing manual low-pressure pump has low work efficiency and is prone to leakage due to sealing problems.

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