Sucker rod anti-eccentric grinding device for coal-bed gas well

Abstract

A sucker rod anti-eccentric grinding device for a coal-bed gas well comprises a centralizing mechanism; the center of the centralizing mechanism is provided with a mounting hole for inserting a sucker rod; a plurality of idler wheels are uniformly arranged at the periphery of the centralizing mechanism along the center of the mounting hole; the plane where the rotary direction of each idler wheel is positioned passes by the central line of the centralizing mechanism; the outer surfaces of all idler wheels are positioned on the same circle. The sucker rod anti-eccentric grinding device for the coal-bed gas well has the remarkable and beneficial effects that at the bent part of a shaft, when the sucker rod is bent along the shaft, firstly, the idler wheels arranged on the centralizing mechanism are directly contacted with an oil sucking pipe, and in the up and down motion of the sucker rod, the idler wheels roll along the inner wall of the oil sucking pipe, so the sliding friction of the existing centralizer and the pipe wall of the pipe is changed to be rolling friction, the friction resistance is greatly reduced, the abrasion of the centralizer and the pipe wall is reduced, and the service life of the centralizing device and that of the oil sucking pipe is prolonged. The work time of the air exhaust shaft is greatly shortened, and massive maintenance cost and maintenance time are saved.

Description

technical field [0001] The invention belongs to the technical field of coalbed methane development, and in particular relates to an anti-eccentric wear device for sucker rods used in coalbed methane wells for pumping water and producing gas with rod pumps. Background technique [0002] During the mining process of coalbed methane, it is necessary to continuously discharge the water in the coal seam to reduce the pressure of the coal reservoir, so that the adsorbed methane can be desorbed below the desorption pressure. In this process, the coal seam water needs to be continuously discharged to maintain a low coal seam pressure. . At present, the pumping unit is mainly used for drainage and gas recovery technology. During the lifting process of the pumping unit, there is an eccentric wear phenomenon between the sucker rod and the sucker pipe, especially in deep wells, directional wells, horizontal wells, and pinnate wells. The curved wellbore parts such as horizontal wells ar...

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Problems solved by technology

[0004] In order to solve the defects of the sliding centralizer in the prior art, such as the large friction coefficient, the large friction force affecting the movement of the sucker rod, and the short service life of the centralizer, the invention ensures the smooth movement of the sucker rod and prevents deviation from the sucker pipe. Under the premise of grinding, provide a sucker rod anti-eccentric wear device for coalbed methane wells with simple structure, reliable function and convenient installation

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