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Semicircular plate used for oil drilling platform leg and manufacture process thereof

A technology for oil drilling platform and manufacturing process, applied in the direction of sheet/plate, artificial island, sheet pile wall, etc., can solve the problem of semi-circular plate dependence on imports, achieve high sawing precision, ensure dimensional accuracy, and eliminate tissue stress Effect

Active Publication Date: 2009-11-11
CHINA NAT OFFSHORE OIL CORP +1
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  • Abstract
  • Description
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AI Technical Summary

Problems solved by technology

[0003] Since there is no complete set of large-tonnage presses and supporting series of molds in China, the semi-circular plates for platform legs have always relied on imports

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0020] The manufacturing process of the present invention mainly includes the following steps: electric furnace smelting→LF furnace refining→vacuum degassing treatment→continuous casting tube billet→tube billet heat treatment→pipe billet surface grinding and finishing→pipe billet sizing and cold centering→pipe billet Heating→perforation→sizing→heat treatment→sampling, performance inspection→straightening→stabilizing heat treatment→internal and external grinding→ultrasonic flaw detection→eddy current flaw detection→cutting head and tail→checking marking→longitudinal sawing→finished product inspection. specifically is:

[0021] First of all, the continuous casting of the tube billet is carried out, that is, through the tube billet continuous casting equipment, the molten steel in the ladle that has been smelted and the composition has reached the requirements is poured into the tundish of the continuous casting machine, and passed through the continuous casting tooling such as th...

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PUM

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Abstract

The invention discloses a process for manufacturing an oil drilling platform leg, comprising the following steps of: continuously casting a molten steel with the composition complying with the requirement into a solid tube blank; processing the tube blank as a seamless steel pipe; and finally sawing the seamless steel pipe into the semicircular plate by longitudinal sawing operation. The invention also discloses a semicircular plate used for the oil drilling platform leg. The process directly changes the existing technology of pressing semicircular plate by steel plate, adopts the mode of a formed steel pipe to segment and manufacture the semicircular plate and leads the process forming way to be different from the original type; the processing technology route is firstly created in the field; and the manufacture cost is greatly reduced as large-tonnage presses are not adopted.

Description

technical field [0001] The invention relates to a semicircular plate for pile legs of an oil drilling platform and a manufacturing process thereof. Background technique [0002] Large jack-up platforms are used for exploration and exploitation of offshore oil / gas resources, and the main body of the platform is supported by pile legs. The pile leg is triangular truss type, and the main side pipe with rack is arranged at the triangle of the pile leg structure, and the support pipe is connected between them. The main side tube includes two opposite semicircular plates and racks, and the manufacture of semicircular plates for platform legs has been blank in our country. The manufacturing process of the foreign semicircular plate mainly includes: rolling steel plate - splitting the steel plate - hot pressing the steel plate by a large tonnage press - heat treatment of the semicircular plate, finishing and shaping. [0003] Since there is no complete set of large-tonnage presses...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16S1/00E02D5/22E02B17/00
Inventor 刘宝元张达凯简吉庆辛伟孔繁堂吕明柯
Owner CHINA NAT OFFSHORE OIL CORP
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