Multi-pass thickening molding integrated heavy weight drill pipe manufacturing method

A manufacturing method and multi-pass technology, applied in the direction of drill pipe, drill pipe, drilling equipment, etc., can solve the problems of large amount of raw materials, low pass rate, high cost, etc., and achieve the effect of simple process

Inactive Publication Date: 2014-10-15
NANTONG YONGDA PIPE IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a seamless steel pipe using high-molybdenum and high-chromium alloys, which can be thickened and formed in multiple passes at the end, so as to solve the problem of excessive raw material consumption and overall heat treatment in the production process of the existing technology. The manufacturing method of multi-pass thickening and integrally weighted drill pipe in the case of high cost and low pass rate when drilling the central deep hole

Method used

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  • Multi-pass thickening molding integrated heavy weight drill pipe manufacturing method
  • Multi-pass thickening molding integrated heavy weight drill pipe manufacturing method

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Effect test

Embodiment 1

[0016] Embodiment one: if figure 1 , figure 2 As shown, the manufacturing method of multi-pass thickening and forming integrally weighted drill pipe, the specific steps are as follows:

[0017] (1) Use large-wall thick seamless steel pipes containing high molybdenum and high chromium alloys as raw materials; this is convenient to ensure the hardenability of the material;

[0018] (2) Using an intermediate frequency furnace to conduct intermediate frequency heating on the end of the seamless steel pipe, the heating temperature is 1190°C; this is convenient for the subsequent upsetting process;

[0019] (3), first put the forming mandrel 1 into the interior of the seamless steel pipe, and clamp it on the outside of the seamless steel pipe with the thickening die 2, and then push the above seamless steel pipe into the extrusion die, Start the upsetting extrusion machine to forge the seamless steel pipe as a whole to a finished product that conforms to the shape of the above-me...

Embodiment 2

[0022] Embodiment two: if figure 1 , figure 2 As shown, the manufacturing method of multi-pass thickening and forming integrally weighted drill pipe, the specific steps are as follows:

[0023] (1) Use large-wall thick seamless steel pipes containing high molybdenum and high chromium alloys as raw materials;

[0024] (2) Using an intermediate frequency furnace to conduct intermediate frequency heating on the end of the seamless steel pipe, and the heating temperature is 1205°C;

[0025] (3), first put the forming mandrel 1 into the interior of the seamless steel pipe, and clamp it on the outside of the seamless steel pipe with the thickening die 2, and then push the above seamless steel pipe into the extrusion die, Start the upsetting extruder to forge the seamless steel pipe as a whole to a finished product conforming to the shape of the above-mentioned thickening die 2, wherein the clamping force of the upsetting extruder is 5.6MN, the upsetting pressure is 425MPa, and th...

Embodiment 3

[0028] Embodiment three: as figure 1 , figure 2 As shown, the manufacturing method of multi-pass thickening and forming integrally weighted drill pipe, the specific steps are as follows:

[0029] (1) Use large-wall thick seamless steel pipes containing high molybdenum and high chromium alloys as raw materials;

[0030] (2) Using an intermediate frequency furnace to conduct intermediate frequency heating on the end of the seamless steel pipe, and the heating temperature is 1210°C;

[0031] (3), first put the forming mandrel 1 into the interior of the seamless steel pipe, and clamp it on the outside of the seamless steel pipe with the thickening die 2, and then push the above seamless steel pipe into the extrusion die, Start the upsetting extrusion machine to forge the seamless steel pipe as a whole to a finished product conforming to the shape of the thickening die 2 above, wherein the clamping force of the upsetting extrusion machine is 7.8MN, the upsetting pressure is 425M...

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Abstract

The invention relates to the technical field of petroleum drill pipe processing and manufacturing, in particular to a multi-pass thickening molding integrated heavy weight drill pipe manufacturing method. The method specifically comprises the following steps of (1) selecting a large-wall thickness seamless steel tube containing high-molybdenum and high-chromium alloy as a raw material; (2) adopting an intermediate frequency furnace to carry out intermediate frequency heating on the end part of the seamless steel tube, wherein the heating temperature is 1190-1210 DEG C. According to the method, firstly, the seamless steel tube containing the high-molybdenum and high-chromium alloy is adopted as a tube body; secondly, the seamless steel tube containing the high-molybdenum and high-chromium alloy is subjected to upsetting thickening molding by adopting an integrated upsetting heavy weight drill pipe technology; finally, the subsequent processing is carried out to enable a finished product to reach the standards of 980 Mpa yield strength, 1105 Mpa tensile strength, 16% ductility, and (-20) 75 J ballistic work. The production technology is capable of solving the problems that in the traditional technology production process, too much raw materials are used, the cost of the whole thermal processing is overhigh, the yield of central deep hole drilling is over low, and the like.

Description

technical field [0001] The invention relates to the technical field of processing and manufacturing petroleum drill pipes, in particular to a manufacturing method for multi-pass thickening and forming integrally weighted drill pipes. Background technique [0002] In the process of oil extraction, the main tool used most is the oil drill pipe. Its yield strength, drilling depth, service life, processing cost and reuse times have always been the considerations and concerns of production and processing oil drill pipe manufacturers and oil exploration users. [0003] At present, there are two methods of producing and processing heavy drill pipes: welding type and bar processing type. Welding processing requires friction welding between the weighted pipe body and the weighted joint to become a weighted drill pipe; the bar processing type is a heavy drill pipe processed by drilling, drilling and threading on the bar body . The former is a relatively common processing method at ...

Claims

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Application Information

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IPC IPC(8): B23P15/00E21B17/00
CPCB23P15/00E21B17/00
Inventor 朱世忠肖天甫郭军
Owner NANTONG YONGDA PIPE IND
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