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Production process of integral kelly stem

A production process and kelly technology, which is applied in the fields of heat treatment, machining, steelmaking, and forging, can solve the problems of short service life, narrow application range, complex structure, etc., and achieve long service life, good product quality, and production process economic effect

Active Publication Date: 2012-07-04
HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to make up for the deficiencies of the existing kelly production process, the purpose of the present invention is to provide a production process for an integral kelly to solve the complex product structure of the existing kelly, and the welding stress and quality caused by segmental welding of products. Poor, short service life, narrow application range and other defects

Method used

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  • Production process of integral kelly stem
  • Production process of integral kelly stem
  • Production process of integral kelly stem

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Embodiment Construction

[0018] Below in conjunction with specific embodiment and appended figure 1 -4 further introduces the technical solution of the present invention in detail, but the protection of the present invention is not limited thereto.

[0019] Embodiments 1 to 5 are the production process of 133.4mm wide kelly (square kelly or hexagonal kelly), and embodiments 6 to 10 are 88.9mm wide kelly (square kelly or hexagonal kelly). Hexagonal drill pipe) production process. see Figure 1 to Figure 4 , the present invention comprises following five processes by operation:

[0020] (1) Smelting process:

[0021] Steel 4145H for oil drilling tools is smelted in an electric furnace and vacuum refined, then vacuum degassed and cast into steel ingots. After demolding, the steel ingots are hot sent to the forging process. Among them, the baking temperature of the refining bag is ≥900°C, the reducing atmosphere is maintained during the refining period, and the flow of argon gas is well controlled, so...

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Abstract

The invention discloses a production process of an integral kelly stem, which comprises five procedures according to the operational sequence: smelting, forging, machining, thermally refining and refining, wherein slot milling and imprinting, imprinting, finished product check, paint spraying and packaging and then delivery can be carried out after the refining procedure is ended. The production process is more economic and scientific and has low production cost; and the produced integral kelly stem has good quality, meets the use requirement on the environment, is integrally manufactured, has the advantages of simple structure, no need of welding, no existence of welding stress inside the product, good quality and long service life, and is widely suitable for the field of petroleum drilling operation.

Description

technical field [0001] The invention belongs to the technical fields of steelmaking, forging, machining and heat treatment, and in particular relates to a production process of an integral kelly. Background technique [0002] Kelly is one of the important drill string components used in oil drilling operations. It mainly plays the role of transmitting power and connecting bottom hole drilling tools during drilling. According to the service conditions, the kelly should be made of high-strength and rigid materials. The mechanical properties should meet the Ministry of Petroleum standard SY / T6509-2000 or API SPEC7-1 standard (the two standards are basically the same). There are two types of kelly, square and hexagonal. The product features are that the upper and lower thickened ends are round and large in size (the diameter of the upper thickened end is Φ196.9mm, and the end has 65 / 8REG left-handed internal thread or 41 / 2REG left-handed internal thread, the diameter of the l...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23P15/00B21K5/02C21D8/00C21D9/00
Inventor 张雪梅高全德黄存涛赵颖刘岩范志霞
Owner HENAN ZHONGYUAN SPECIAL STEEL EQUIP MFG CO LTD
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