A Warm Extrusion Forming Process for Oil Drill Pipe Internal Thread Joints

Abstract

The invention belongs to the technical field of metal plastic forming, and particularly relates to a warm extrusion forming process of an internal thread joint of a petroleum drill rod. The forming process comprises the following steps of (1) cutting, (2), surface cleaning, (3), lubricating agent dip-coating, (4) induction heating, (5) warm extrusion forming of a prefabricated blank, (6), warm extrusion forming of a forging, (7), wad punching, (8), heat treatment, (9), machining and (10), appearance coating. In the forming process, the metal plastic performance of the blank is improved under the action of three-direction pressure stress, the metal internal streamline is improved, the quality and mechanical property of the forging are improved from the microstructure, and the quality of the prefabricated blank and the forging is improved. According to the forming process, strong oxidization is not generated, extrusion is carried out through a mold, the blank is formed, the utilization rate of raw materials is improved, the manufacturing period is shortened, the oxidization degree of the metal blank and the deformation after blank forming are reduced, the quality of the forging is improved, and production cost is lowered.

Description

technical field [0001] The invention belongs to the technical field of metal plastic forming, and in particular relates to a warm extrusion forming process for internal thread joints of petroleum drill pipes. Background technique [0002] With the shortage of global energy supply, major industrial countries are stepping up the drilling and production of underground energy such as oil and natural gas. In oil extraction, the demand for drilling tools is more and more strong, and the performance requirements are getting higher and higher. Oil drilling tools are mainly composed of drill pipes, connecting sleeves, stabilizers and drill jacks. They are mainly suitable for the construction of deep wells, horizontal wells and extended-reach wells in the process of oil and gas exploration and development. The working environment is harsh, generally hundreds of meters or even several Kilometers of underground work needs to withstand various forces such as tension, compression, twisti...

AI Technical Summary

Problems solved by technology

[0004] The shape of the preform and the position of the continuous skin have a great influence on the quality of the forging and the forming process. Generally, there are two types of preform shapes. One is that the continuous skin is located in the middle of the preform, which makes it difficult to fill the bottom of the forging; the other is continuous. The position of the skin is located at the bottom of the preform, resulting in a large load and a long stroke, the punch is easy to bend, and the forging is easily locked on the punch

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