Elastic centralizer

Abstract

The invention discloses an elastic centralizer, and relates to the technical field of oil extraction. The elastic centralizer is characterized in that a lower shell and a gathering and transportationpipeline are welded together, each of the upper and lower portions of the cylindrical section of a body is provided with a rotating sleeve, the upper and lower portions of each rotating sleeve are provided with positioning sleeves, and three air cylinder barrels, pistons, piston rods and push plates are arranged on the outer circle surfaces of the rotating sleeves correspondingly. The elastic centralizer has the beneficial effects that the push plates rotate circumferentially along a fixed rotation direction, meanwhile, the push plates move up and down, oil wax and impurities attached to the inner walls of oil pipes are scraped off by the push plates in the circumferential direction and the length direction of the oil pipes, so that the smoothness of a crude oil production pipeline is kept, the oil extraction efficiency is improved, the energy consumption is reduced, and the air pressure in the air cylinder barrels is adjusted; the elastic centralizer is suitable for various oil wellsand oil pipes with different diameters, when the centralizer passes through the narrow parts of the inner walls of the oil pipes or the bent parts of a horizontal well, the elastic support of the compressed air can adapt to the change, so that the clamping stagnation phenomenon is avoided, the smooth movement of a sucker rod is kept, and the problems that the rigidity of a metal elastic element cannot be changed, and the metal elastic element is easily blocked by impurities and loses elasticity are avoided.

Description

Technical field: [0001] The invention relates to the technical field of oil production, in particular to an elastic centralizer. Background technique: [0002] The sucker rod centralizer is an anti-eccentric downhole tool for pumping wells, which is suitable for pumping wells with eccentric wear. The existing oil rod centralizer is usually equipped with a set of scrapers to clean the dirt on the inner wall of the oil pipe during use. However, the diameter of the scraper on the existing oil rod centralizer cannot be changed. When the dirt in the oil pipe has a certain thickness, it is difficult for the scraper to scrape off the dirt on the inner wall of the oil pipe, thereby increasing the time when the oil rod centralizer moves. resistance, and when the inner wall of the oil pipe changes in diameter, if the oil rod centralizer cannot change its own diameter, it is easy to get stuck inside the oil pipe and damage the oil pipe. The elastic centralizer currently used uses sprin...

AI Technical Summary

Problems solved by technology

[0002] The sucker rod centralizer is an anti-eccentric downhole tool for pumping wells, which is suitable for pumping wells with eccentric wear. The existing oil rod centralizer is usually equipped with a set of scrapers to clean the dirt on the inner wall of the oil pipe during use. However, the diameter of the scraper on the existing oil rod centralizer cannot be changed. When the dirt in the oil pipe has a certain thickness, it is difficult for the scraper to scrape off the dirt on the inner wall of the oil pipe, thereby increasing the time when the oil rod centralizer moves. resistance, and when the inner wall of the oil pipe changes in diameter, if the oil rod centralizer cannot change its own diameter, it is easy to get stuck inside the oil pipe and damage the oil pipe. The elastic centralizer currently used uses springs or elastic discs to improve the above Problem, there is still the problem of elastic failure due to impurities inserted into the spring and elastic disc

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