Low pressure pump

Abstract

The invention relates to the technical field of drilling and production of oil fields and oil wells, particularly to a low pressure pump. The low pressure pump comprises a hydraulic cylinder, a pistonrod, a piston, a first steel ball, a spring, an inner hexangular nut and a second steel ball, wherein the piston rod is connected with the piston; the piston is arranged in the hydraulic cylinder; aliquid drainage hole and a liquid inlet which communicate with the hydraulic cylinder are formed in the bottom of the hydraulic cylinder; an upper step table is arranged in the liquid drainage hole; the first steel ball is arranged in the liquid drainage hole and is clamped at the upper step table; the lower part of the first steel ball is connected with the spring; the inner hexangular nut fixesthe spring in the liquid drainage hole from the lower part of the hydraulic cylinder; a lower step table is arranged on the liquid inlet; the second steel ball is clamped on the lower step table; andsteel ball baffle plates are arranged at the upper parts of the liquid drainage hole and the liquid inlet. According to the low pressure pump, the structure is simple, the liquid drainage hole and theliquid inlet are alternately blocked through the two steel balls, the sealing effect can be greatly improved through ball sealing, and working efficiency of the low pressure pump is effectively improved.

Description

technical field [0001] The invention relates to the technical field of oil well drilling and production in oil fields, in particular to a low-pressure pump. Background technique [0002] Due to reasons such as cementing quality, connecting thread, formation movement, and corrosion, the oil well casing has leakage phenomenon, which brings unfavorable factors to the construction of oil well measures and affects the crude oil production. Once the leakage occurs in the non-producing layer of the oil well, the leakage point must be determined before repairing. The current method for verifying the leakage point of the casing is generally to use a packer to seal the oil casing annulus above the production layer and pressurize the casing. Verify the bushing. However, several existing packers have unfavorable factors in varying degrees during the implementation of the test set construction process, resulting in unsmooth construction and an inability to accurately determine the locat...

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-mentioned work needs to use a low-pressure pump for pressure. Due to the sealing problem of the existing low-pressure pump, the work efficiency is low and it is easy to leak

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