Drill rocker end upsetting method

Abstract

The invention relates to a technology for thickening the pipe end of a drill pipe, an oil pipe and a sleeve used for oil and natural gas drilling, in particular to a method for thickening the pipe end of the drill pipe. The conicity and the length of a pipe end external thickening transitional section and an external thickening section are molded by mould control. The conicity and the length of an internal thickening transitional section are molded freely by the upset forging of a punching head. The technology is characterized in that each pass Meu during the process is shortened gradually, and the conicity is increased gradually. The invention mainly solves the technical problem in the multi-pass thickening technology by a drill pipe internal-external thickening method that the start point of the internal thickening transitional section of a first thickening pass always has concave pits and embossments. The invention improves the smooth transitional shape of an internal thickening transitional zone and ensures that the round angle diameter at the position of a thickening zone disappearing point is more than 300mm, and the invention reduces the workload for grinding and improves the thickening quality.

Description

technical field [0001] The invention relates to a technology for thickening pipe ends of drill pipes, oil pipes and casings used in petroleum and natural gas drilling, in particular to a method for thickening pipe ends of drill pipes. Background technique [0002] Drill pipe is the main component of oil and gas drilling tools. Drill pipe is composed of pipe body and threaded joints. The connection method between the threaded joint and the pipe body is friction welding. In order to realize the reasonable welding of large-wall-thickness joints and small-wall-thickness pipes, it is generally necessary to thicken the two ends of the pipe body, which can improve the stress distribution of the welded part of the drill pipe during work, achieve a smooth transition, and improve drilling performance. Rod work and performance. At present, my country's drill pipe production is mainly based on the American API standard, which requires: the pipe end must have an inner thickening transi...

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to provide a method for thickening the pipe end of drill pipe, which mainly solves the problem that in the existing multi-pass thickening process of the internal and external thickening method of the drill pipe, the problem often occurs at the starting point of the transition section of the first thickening pass. The technical problem of pits and protrusions improves the smooth transition shape of the inner thickening transition zone, ensuring that the diameter of the rounded corner at the disappearing point of the thickening zone is greater than 300mm, reducing the grinding workload and improving the quality of thickening

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