Oil well pipe body screw thread bonderite processing technology

Abstract

The invention discloses a phosphating technology for pipe body screw threads of an oil well pipe, which comprises the following steps: a liquid bonderite is put in a vessel; spray coating is conducted by adopting compressed air and simultaneously, the pipe body screw threads of the oil well pipe are turned; after the surfaces of the pipe body screw threads of the oil well pipe are all covered by phosphating liquid, even sweeping is carried out on the phosphating surfaces, thus leading the phosphating liquid on the phosphating surfaces to be further evenly distributed and the surplus phosphating liquid to be blown down; and after the phosphating-treated pipe body screw threads of the oil well pipe are laid aside for 15 seconds to 30 seconds, the surfaces of phosphating films thereof are dried. The phosphating technology of the invention atomizes and imposes the bonderite on the surfaces of steel component materials to be treated and leads the bonderite distributed on the surfaces to be treated to be even; the phosphating is simple and easy to be conducted, with short dry time; the bonderite does not scale easily and the phosphating film is uniform in thickness, compact and stable.

Description

technical field [0001] The invention relates to the manufacture of oil special pipe products, in particular to a phosphating treatment process for threads of oil well pipe bodies. Background technique [0002] Usually, the length of a single oil well pipe in petroleum special pipe products is about 10 meters, and its two ends are respectively internal and external threads. The connection part has sufficient sealing performance and connection strength. After screwing, the thread tooth surface will produce high contact stress. In order to avoid the thread sticking damage caused by this, phosphating the oil well pipe thread is a more effective surface Processing technology. [0003] The connection form of the oil well pipe thread is divided into coupling connection (both ends of the oil well pipe body are external threads, one of which is screwed with a coupling with an internal thread on both sides) and direct connection (both ends of the oil well pipe body are Respectively ...

AI Technical Summary

Problems solved by technology

[0008] The invention mainly solves the problems of easy scaling, unstable phosphating film thickness and long drying time when phosphating the thread of the oil well pipe body manually under natural temperature conditions in the prior art, and provides an oil well pipe Body thread phosphating treatment process, which can be processed automatically and manually, is not easy to scale, easy to guarantee quality and easy to implement