V150 steel grade drill rod compression-joint forming process

Abstract

The invention discloses a V150 steel grade drill rod compression-joint forming process, belonging to the technical field of oil field well drilling equipment processing. The drill rod includes a joint and a tube body. The process comprises a primary friction stage, a secondary friction stage and a heading upsetting stage, and the contact face temperature of the joint and the tube body reaches the required temperature by controlling different axial pressures, rotation speeds and durations at the three stages, to satisfy the drill rod compression-joint forming process. The process employs three-times forming technology, adopts two-times friction buffer to replace one-times friction buffer and enhances the process performance of the butt welding part of the drill rod by more accurate pressure control, more reasonable pressure distribution and more stable friction process.

Description

technical field [0001] The invention relates to a drill pipe forming process, which belongs to the technical field of oil field drilling equipment processing, in particular to a V150 steel grade drill pipe crimping forming process. Background technique [0002] Petroleum drill pipe is the main tool for oil field drilling, and its structure includes the drill pipe body and the drill pipe joints at both ends of the drill pipe body. In the process of oil and gas extraction and refining, the drill pipe body must be able to withstand huge internal and external pressure, twisting, bending and vibration. [0003] With the continuous development of the petroleum industry, more and more deep wells and ultra-deep wells have been developed, which puts forward higher and higher requirements for drill pipes. Due to the slender size and hollow structure of the oil drill pipe, it is more difficult to form it by forging and improve the precision. The traditional production method of drill...

AI Technical Summary

Problems solved by technology

Due to the slender size and hollow structure of the oil drill pipe, it is more difficult to form it by forging and improve the precision

The traditional production method of drill pipe blanks is to use high-performance materials to form them through mechanical processing, and to ensure the final performance requirements of the product through heat treatment. Quality is not easy to control and other defects

With the shortage of energy and materials, it is difficult to directly use mechanical processing to meet the current industry needs for material saving and consumption reduction

At present, the drill pipe is mainly formed by film forging and extrusion. Compared with mechanical processing, although this forming method has greatly improved the mechanical properties of the product, the production process is backward and the efficiency is low.

[0004] In addition, after searching, the patent application No. 200610098616.2 discloses a method of extrusion forming with drill pipe structure. The production process includes heating, upsetting, composite extrusion and punching and continuous skinning. ℃, which limits the travel of the press during extrusion

The process method is one-time extrusion molding, and the process steps are too few, so it is difficult to control the product quality and processing accuracy