Elastic polishing sand ball and use method thereof

Abstract

The invention discloses an elastic polishing sand ball and a use method thereof, which are designed for completely clearing non-smelted micro-particles attached to the surface of a coating. An elastic rubber solid ball is arranged in the innermost space of the elastic polishing sand ball; a bottom rubber layer, an abrasive layer and a surface rubber layer are arranged on the solid ball outwardly in sequence. After an organic coating is sprayed to the inner wall of an oil pipe, the elastic polishing sand ball is driven by using a special clamp to do reciprocating motion, and the organic coating is ground and polished through contact pressure of the sand ball and the inner wall of the pipe; the elastic polishing sand ball can be replaced and used according to the specific condition of the organic coating from small diameter to big diameter or jumpily; before replacement of the sand ball and after grinding and polishing, the inner wall of the pipe is push-broomed by using a rubber cup. According to the elastic polishing sand ball, the organic coating on the inner wall of the oil pipe can be ground and polished to clear the non-smelted micro-particles attached to the surface of the coating, reduce the roughness of the surface of the coating and guarantee smooth and flat surface of the coating, so that the wear resistance performance of the coating is improved. The conventional fan blowing method can be substituted, and the elastic polishing sand ball a is convenient to use and is safe and environment-friendly.

Description

technical field [0001] The invention relates to an elastic polishing sand ball and a using method thereof, belonging to the technical field of steel pipe internal anticorrosion. Background technique [0002] In the production of oil and gas wells, the inner wall of the tubing is exposed to corrosive media and is easily corroded. There are many anti-corrosion methods for the inner wall of the oil pipe. One of the most commonly used methods is electrostatic spraying organic coating, that is, using a high-voltage electrostatic electric field to drive negatively charged paint particles to move in the opposite direction of the electric field, so that the paint is adsorbed on the inner wall of the oil pipe. When the tubing is preheated above 180°C in advance, the paint particles will melt, spread, adhere and solidify quickly. After the coating is cured, an organic coating with a certain thickness is formed on the inner wall of the oil pipe, which can separate the metal from the c...

AI Technical Summary

Problems solved by technology

[0003] However, after the electrostatic spraying is completed, part of the paint is not melted due to the fact that some paint particles are too close to the outer surface or are not heated sufficiently, resulting in an uneven coating surface and increased roughness.

The existing treatment measures are usually blown by fans, which will pollute the environment and deteriorate the working conditions of workers, and some unmelted particles solidify on the surface of the coating, which is difficult to remove

Due to the slender oil pipe, it is difficult to perform overall grinding and polishing of the inner wall coating with ordinary sandpaper

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