Drill rocker end upsetting method

A drill pipe and pipe end technology, applied in the field of pipe end thickening, can solve problems such as pits, protrusions, and reduce grinding workload

Inactive Publication Date: 2009-05-27
SHANGHAI HILONG DRILL PIPE MATERIALS INST
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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

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  • Drill rocker end upsetting method
  • Drill rocker end upsetting method
  • Drill rocker end upsetting method

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Example Embodiment

[0016] The invention provides a method for thickening the pipe end of a drill pipe. The taper and length of the outer thickened transition section and the outer thickened section of the pipe end are formed by mold control, and the taper and length of the inner thickened transition section are formed by punching. The head is forged freely. The first thickening pass Meu1 takes 100-110mm, the second pass Meu2 takes 70-80mm, and the third thickening pass Meu3 takes 50-60mm; the three passes Meu gradually shorten and the taper gradually increases, so as to overcome In the traditional process, the Meu of the first thickening pass is short and the taper is large, which causes the material to bend, and then the defects such as bumps and pits appear. It reduces the workload of internal grinding during the thickening process and improves the quality of the thickening. .

[0017] Take Φ127*9.19 pipe thickening as an example, after calculating the thickening pass is three heating thickening, ...

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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...

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Application Information

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IPC IPC(8): B21J5/06
Inventor 袁鹏斌王广群周勇其
Owner SHANGHAI HILONG DRILL PIPE MATERIALS INST
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