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High steel level petroleum casing pipe and oil pipe manufacturing process

A technology for oil casing and manufacturing process, applied in the direction of manufacturing tools, casings, drill pipes, etc., can solve the problems of large variation in the length of the finished pipe, low market matching, and low precision of the wall thickness of the seamless pipe. Low cost, easy to size, uniform wall thickness

Inactive Publication Date: 2009-07-15
江苏嘉宝科技制管有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the rolling process of seamless pipes, the wall thickness accuracy of seamless pipes is low, the length of finished pipes varies widely, and the market matching is low

Method used

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  • High steel level petroleum casing pipe and oil pipe manufacturing process
  • High steel level petroleum casing pipe and oil pipe manufacturing process

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with the drawings and its specific implementation.

[0015] Such as figure 1 As shown, the entire steel pipe production process includes the following parts: slitting production line, ERW welded pipe production line, pipe end thickening production line, steel pipe quenching and tempering production line, and pipe processing production line.

[0016] Among them, the raw material of the slitting production line is the hot rolled coil produced by a regular large-scale steel enterprise. The composition of the steel pipe is very strict, especially the content control of harmful elements. Although the requirements for P and S in the API 5CT standard are not high, ≤0.03 % Is sufficient, but in actual production, the control of P and S is very strict, and the requirements are: P≤0.01%, S≤0.008%. And there are certain requirements for the shape of inclusions. Generally, there is refining outside the furnace in the...

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Abstract

The invention discloses a preparation method of high-grade steel petroleum casing pipes and oil pipes, and relates to a manufacturing method of petroleum casing pipes and oil pipes; hot rolled steel coils are taken as raw material for manufacturing the steel pipes, and ERW welded pipe material is firstly manufactured by the processes such as longitudinal-shearing striping, band steel formation, high-frequency welding, burr cleaning inside and outside of the welding seams, welding seam detection, intermediate-frequency welding seam annealing, sizing, cutting off, straightening and the like; and the processes such as post-welding finishing, end upsetting (heavy wall tubing needs the process), integral hardening and tempering, medium-temperature straightening, pipe end detection, pipe threading processing, collar screw coupling, hydraulic pressure test, path test, pipe body detection, length measurement, weighting, oiling and the like are carried out, thus producing the high-grade steel petroleum casing pipes and oil pipes. The steel grade of the steel pipe can reach the steel grade specified in API 5CT standard for manufacturing N80Q, L80, C95, P110 and Q125 with a welding method. The high-grade steel petroleum casing pipes and oil pipes manufactured by the invention has the advantages of high production efficiency, low production cost, high lumber recovery, and high product quality.

Description

Technical field: [0001] The invention relates to a method for manufacturing petroleum casing and tubing, in particular to the use of hot rolled coils to produce high-steel casing and tubing such as N80Q, M65, L80-1, C95, P110, and Q125 specified in the API5CT standard Process method. Background technique: [0002] In recent years, there have been many ERW welded pipe production lines in China. Some low-grade oil casing pipes are produced through the ERW welded pipe production line. The steel grade is limited to H40, J55, K55, etc., and for the N80Q, M65, L80- 1. C95, P110, and Q125 domestic ERW welded pipe factories are still unable to produce, and these high-grade steel products are all monopolized by seamless pipes. The conventional manufacturing method of domestic and foreign high-grade oil casing and tubing is to use seamless steel pipe as the raw material and go through the process of pipe end thickening, overall quenching and tempering, and pipe processing. There are many r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B17/00B23P15/00B23K13/00C21D1/26C21D9/08C21D9/50B21J1/06B21D3/00
Inventor 潘克云
Owner 江苏嘉宝科技制管有限公司
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