Bimetal metallurgical composite pipe and manufacturing method thereof

A composite pipe and bimetallic technology, which is applied in the field of bimetallic metallurgical composite pipe and its preparation, can solve the problems of bimetallic composite pipe interface strength, oil pipe end treatment, etc., and achieve the effect of compact structure, straight joint interface and uniform thickness

Active Publication Date: 2019-08-30
BC P INC CHINA NAT PETROLEUM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a bimetallic metallurgical composite pipe and its preparation method to solve the problems of the interface strength of the bimetallic composite pipe and the treatment of the oil pipe end

Method used

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  • Bimetal metallurgical composite pipe and manufacturing method thereof
  • Bimetal metallurgical composite pipe and manufacturing method thereof
  • Bimetal metallurgical composite pipe and manufacturing method thereof

Examples

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preparation example Construction

[0044] see figure 2 and image 3 , the preparation method of a kind of bimetallic metallurgy composite pipe of the present invention, comprises the following steps: according to the wall thickness requirement of bimetallic metallurgy composite pipe billet, process the water-cooled metal model of inner and outer layer metal pipe, first cast the outer wall metal pipe, wait for the outer wall After the layer tube is solidified, within a certain temperature, the inner layer metal tube is cast, and the structure of the water-cooled metal model of the bimetallic metallurgical composite tube and the structure of the tube blank are shown in figure 1 , which is characterized in that both ends of the tube blank are covered by inner metal. The solidified bimetallic metallurgical composite tube billet is hot-rolled, and the tube billet is heated again to 900 ℃ ~ 1200 ℃, and two rough rolling and one finishing rolling are carried out. The rolling temperature is controlled by the heating ...

Embodiment

[0059] A method for preparing a Φ139.7mm×9.17mm nickel-based alloy 625 / P110 bimetallic metallurgical composite pipe according to the embodiment of the present invention, the specific steps are as follows:

[0060] S1, processing water-cooled die-casting metal model: This model includes a hollow cylindrical metal mold with an inner diameter equal to the outer diameter of the bimetallic tube blank, and two metal mandrels with different diameters.

[0061] S2, Smelting: According to the chemical composition requirements of P110 carbon steel and nickel-based alloy 825, the two metals are smelted by electric arc furnace smelting and out-of-furnace refining.

[0062] S3, water-cooled die casting casting sequence: firstly put the large-diameter metal mandrel concentrically into the hollow cylindrical mold, and cast a certain amount of liquid nickel-based alloy 825 in a vacuum environment to ensure that the bottom of the outer carbon steel pipe is made of corrosion-resistant Alloy cla...

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Abstract

The invention discloses a bimetal metallurgical composite pipe and a manufacturing method thereof. The manufacturing method comprises the following steps of manufacturing a pipe blank of the bimetal metallurgical composite pipe by adopting a vacuum water-cooling die casting technology, specifically inner metal and outer metal are metallurgically combined in a high-temperature diffusion mode, and the two ends of the pipe blank are covered by the inner metal; carrying out hot rolling forming on the obtained pipe blank of the bimetallic metallurgical composite pipe so as to enable the pipe diameter and the wall thickness of the bimetallic metallurgical composite pipe to meet the preset standard and make the inner metal meet the preset thickness requirement; and carrying out quenching and tempering treatment on the whole hot-rolled bimetallic metallurgical composite pipe to make the outer metal meet the preset strength requirement, and completing the manufacturing of the bimetallic metallurgical composite pipe. According to the method, the high strength of an oil pipe column is ensured, and meanwhile, the integrity of corrosion resistance of the inner wall is achieved.

Description

technical field [0001] The invention belongs to the technical field of composite oil pipes for oil and gas development, in particular to a bimetallic metallurgical composite pipe and a preparation method thereof. Background technique [0002] Due to the harsh and corrosive service environment of oil and gas fields, uniform corrosion and pitting perforation failures on the inner wall of oil pipes frequently occur, and some oil pipes even have corrosion and perforation within a few months. According to the H in the environment 2 S partial pressure, CO 2 Partial pressure, Cl - Mass concentration, temperature, pressure and liquid flow, according to the order of increasing corrosion resistance, the available corrosion-resistant alloy materials include low-carbon alloy steel, martensitic stainless steel, duplex stainless steel, iron-corrosion-resistant alloy and Corrosion-resistant alloys. For the high-temperature and high-pressure natural gas fields in Northeast Sichuan, Tari...

Claims

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Application Information

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IPC IPC(8): B23P15/00B21C37/06B22D19/16C21D9/08C21D8/10C22F1/10
CPCB23P15/00B21C37/06B22D19/16C21D9/08C21D8/10C22F1/10
Inventor 路彩虹韩礼红杨尚谕王建军冯春徐欣王航蒋龙朱丽娟
Owner BC P INC CHINA NAT PETROLEUM CORP
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