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Thickening method of petroleum and natural gas drill rod formed by thickening and extrusion

A technology of oil and gas extrusion molding, which is applied in the direction of metal extrusion control equipment, metal extrusion, metal extrusion dies, etc., can solve the problem that the size and shape are difficult to control, it is difficult to ensure the smoothness of the inner transition zone, and the drill pipe fatigue Low service life and other problems, to achieve long length, improve drill pipe performance and reduce non-production time

Inactive Publication Date: 2020-01-10
WUXI DOUBLE HORSE DRILLING TOOLS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way of thickening the inside and outside at the same time, during the operation, the inner transition zone is neither in contact with the thickening die nor with the punch. The inner transition zone is produced in a free-forming way, and its size and shape uncontrollable
Taking the drill pipe with three times of internal and external thickening as an example, it is an impossible task to lengthen the inner transition zone without using one thickening and another thickening to lengthen the inner transition zone; Thick and another thickening method to thicken and lengthen the inner transition zone, and it is difficult to ensure the smoothness of the inner transition zone
The inner transition zone thickened in this way is short, irregular in shape, uneven in potholes, serious in stress concentration, and low in fatigue life of the drill pipe

Method used

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  • Thickening method of petroleum and natural gas drill rod formed by thickening and extrusion
  • Thickening method of petroleum and natural gas drill rod formed by thickening and extrusion
  • Thickening method of petroleum and natural gas drill rod formed by thickening and extrusion

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Embodiment

[0067] Take the most widely used drill pipe of 5 inches, wall thickness 9.19mm, S135 steel grade, IEU thickening form, and material as 4124M as an example, the oil and gas drill pipe thickening method combined with extrusion molding of the present invention can be The inner transition zone at the thickened end is more than 178mm. The implementation process is described in detail below.

[0068] The finished picture of the thickened end of this specification (that is, the picture after the thickened end is processed) is shown in image 3 . Except for the 178mm length of the thickened inner transition zone, which is far greater than the 76.2mm length specified by API 5DP, the rest of the dimensions meet the requirements of API 5DP.

[0069] The first step is the preparation before thickening and extrusion.

[0070] According to the finished product size of the thickened end of the drill pipe, the size of the cold forged part of the thickened end, the size of the cold blank be...

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Abstract

The invention relates to the field of manufacturing of petroleum and natural gas drill rods, in particular to a thickening method of a petroleum and natural gas drill rod formed by thickening and extrusion. The method is characterized in that the sizes of intermediate section semi-finished products are sequentially calculated according to the finished product size of the thickened end of the drillrod, and then the finished product of the thickened end of the drill rod meeting requirements is obtained through combination of external thickening operation and extrusion forming operation and post-processing treatment. By adopting the method, the thickened end of the drill rod needing internal thickening or internal and external thickening is thickened and extruded, the size and shape of an internal transition zone can be controlled, the performance of the drill rod can be effectively improved, and the fatigue service life of the drill rod can be prolonged.

Description

technical field [0001] The invention relates to the field of oil and gas drill pipe manufacturing, in particular to a method for thickening oil and gas drill pipes combined with extrusion. Background technique [0002] The drill pipe used for oil and gas drilling consists of a drill pipe body and a pair of male and female joints that are friction welded at both ends of the drill pipe body. The tensile yield strength of the weld is lower than that of the base material to be welded , in order to increase the load-bearing capacity of the weld, it is necessary to thicken both ends of the drill pipe body, increase the cross-sectional area of ​​the weld, improve its load-bearing capacity, and match the load-bearing capacity of the weld with the pipe body and the joint . Therefore, thickening is an important process in the production of drill pipe used in oil and gas drilling, thickened tubing and casing for oil and gas, and drill pipe for non-excavation construction. The purpose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B21C23/21B21C25/02B21C29/00B21C31/00
CPCB21C23/21B21C25/02B21C29/003B21C31/00
Inventor 王广群周中吉李振奎
Owner WUXI DOUBLE HORSE DRILLING TOOLS
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