Sand-prevention and oil-draining type oil pump

Abstract

The invention provides a sand-proof oil-release oil well pump, which mainly solves the problems that the oil release device in the existing oil pipe string has complex structure and operation and an oil pump piston is easy to be blocked by sands. The invention is characterized in that a variable diameter pump cylinder (5) with a small upper part and a large lower part is connected between an upper joint (1) and a lower joint (2); a piston (3) passes through the small-diameter section on the upper part of the variable diameter pump cylinder (5) and the lower part of the piston (3) is arranged in the large-diameter section at the lower part of the variable diameter pump cylinder (5); the lower end of the piston (3) is always below the small-diameter section of the variable diameter pump cylinder (5) within the stroke; the piston (3) and the small-diameter section at the upper part of the variable diameter pump cylinder (5) adopt a sealable interference fit between; an oil release hole (6) is arranged on the side wall of the small diameter section at the upper part of the variable diameter pump cylinder (5). The oil release hole of the sand-proof oil-release oil well pump is arranged on the side wall of the pump cylinder, and the invention is characterized in that the structure is simple, the operation is convenient, the piston is easy to be blocked by sands, and the operation period is long.

Description

Technical field: [0001] The invention relates to an oil well pump used in the field of oil production in an oil field, in particular to a sand control oil drainage type oil well pump. Background technique: [0002] In order to realize clean operation, reduce ground pollution, and improve the construction environment in oilfield downhole operations, especially in the past two years, the country and enterprises have attached great importance to environmental protection, and it is more and more important to use oil drainers on downhole pipe strings. More and more urgent; From present all kinds of drainers, there are always problems of one kind or another, or are unreliable in the production process, or cannot be opened, or problems such as complicated operation. At the same time, the plunger and fixed valve of the oil pump are often blocked by sediment, scale, and impurities, causing the plunger of the oil pump to be stuck and the fixed valve to fail, reducing the inspection cy...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the disadvantages of complex structure and operation of the existing oil drainage device in the tubing string and that the plunger of the oil well pump is easy to get stuck in sand, the present invention provides a kind of anti-sand oil drainage type oil well pump. Opened on the side wall of the pump barrel, it has the characteristics of simple structure, convenient operation, easy sand jamming of the plunger and long operation period

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