oil well pump

Abstract

The invention discloses an oil well pump and relates to the technical field of oil exploitation. The oil well pump comprises a pump cylinder unit, a plunger unit, a casing pipe and a fixed ball valve unit, wherein the pump cylinder unit comprises an outer pipe made of metal and a plurality of pump cylinders made of ceramics and arranged inside the outer pipe; a first gasket is arranged between every two adjacent pump cylinders; the diameter of the outer pipe is smaller than that of each pump cylinder; the plunger unit is arranged inside the pump cylinders and comprises an upstream movable valve unit, an inner pipe made of metal and connected with the upstream movable valve unit through a plunger upper connector, a plurality of plungers made of ceramics and arranged outside the inner pipe, and a downstream movable valve unit connected below the inner pipe and the plungers through a plunger lower connector; a second gasket is arranged between every two adjacent plungers; a first belleville spring is arranged between the plunger upper connector and the plungers; the lower end of the first belleville spring is used for abutting against the upper end of the plungers; the casing pipe is connected with the outer pipe and internally connected with a connection pipe used for abutting against the plunger unit; a second belleville spring used for abutting against the pump cylinders is arranged between the casing pipe and the connection pipe; and the fixed ball valve unit is connected with the casing pipe and located below the plunger unit.

Description

technical field [0001] The invention relates to the technical field of oil exploitation, in particular to an oil well pump. Background technique [0002] In recent years, as oilfield development enters the middle and later stages, heavy oil development technologies such as steam flooding, SAGD, and horizontal wells have been widely used in Liaohe Oilfield. Lifting technologies such as high bottomhole temperature, large fluid discharge requirements, and enhanced corrosion The problem is becoming more and more serious. Taking SAGD as an example, the daily liquid demand is 300m 3 / d, the temperature at the bottom of the well has reached 240°C, and the H in some wells 2 The S content is above 1400ppm, and the current lifting process equipment can barely meet the production requirements. However, with the continuous rise of the bottom hole temperature, a large amount of corrosive medium is precipitated, and the chemical corrosion phenomenon is intensified. The equipment has a g...

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Problems solved by technology

[0004] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiment of the present invention is to provide an oil well pump, which can solve the problem of unreasonable structure between the ceramic plunger and the metal matrix

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