Repairing method of threads of oil drill pipe

Abstract

The invention relates to a repairing method of the threads of an oil drill pipe. The method comprises determining a thread start, carrying out automatic repair according to the thread start through a thread processing program, revising the thread repairing amount; and numerically controlling the thread repairing. Particularly, the method comprises the following steps: mounting a drill pipe joint to be repaired on a numerical control machine tool, utilizing a thread start searcher to determine the thread start Z1; inputting the thread start Z1 into a parameter #500, and the machine tool programs a special processing macroprogram to automatically compute out the start position of the threads; and setting a repairing amount #502 according to the actual damage amount of the drill pipe. By setting the parameters above, a thread cutter can be guaranteed to perform the repairing processing along the track of the original threads. Compared with a traditional thread repairing method, the repairing method of the threads of the oil drill pipe has the advantage that only a simple thread start searcher is required. An operator of an ordinary technical level can master the operation of the method within a short time. And due to the utilization of the numerical control machine tool, the processing efficiency is high, the quality is stable and no positioning is needed.

Description

technical field [0001] The invention belongs to mechanical processing technology, in particular to a method for repairing the thread of an oil drill pipe. Background technique [0002] During oil drilling, the drill pipes are connected one by one with internal and external tapered pipe threads. Due to the high force and high temperature of the drill pipe during drilling, coupled with the scour friction of high-pressure mud, the shoulder surface and thread profile of the drill pipe are easily deformed, worn or partially damaged, resulting in the scrapping of the entire drill pipe. At present, most of the drill pipes used in my country's oil drilling are imported from abroad and are expensive. Therefore, in order to save foreign exchange and reduce costs, the characteristics of tapered threads are currently used in China to repair the thread profile by machining, so that the drill pipe can be reused many times. [0003] In order to ensure the dimensional accuracy of the mach...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the deficiencies of the above-mentioned technologies and provide a method for repairing the threads of oil drill pipes. By designing a simple thread starting point finder and cooperating with the compilation of special processing macro programs, the processing accuracy existing in the prior art can be solved. Instability, low processing efficiency and serious material waste

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