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930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material and preparation method thereof

A titanium alloy and pipe technology, which is applied in the field of oil well pipe manufacturing in the oil and gas industry, can solve the problems of high operating cost of deep wells in marine engineering, failure accidents of oil pipes, shortening the service life of pipes, etc., so as to reduce the operating cost of deep wells and improve the yield strength. , the effect of prolonging the service life

Inactive Publication Date: 2020-08-04
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

[0004] At present, most of the titanium alloy materials in the prior art are used in aerospace, high-temperature and high-strength fields. When they are used in deep-sea operations of marine engineering, due to the strong acidity in some deep wells, the corrosion rate of the pipes is relatively high, and it is easy to Cause oil pipe failure accidents, shorten the service life of the pipe, and cause high cost of deep well operation in offshore engineering. Therefore, it is urgent to develop a titanium alloy pipe with high strength and strong corrosion resistance

Method used

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  • 930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material and preparation method thereof
  • 930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material and preparation method thereof
  • 930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A method for manufacturing a 930MPa grade Ti-Al-V-Zr-Ru corrosion-resistant titanium alloy pipe, comprising the steps of:

[0032] S1: According to the mass percentage Al: 5.85%, V: 2.35%, Zr: 1.2%, and the balance is Ti, weigh the raw materials, place them in a vacuum consumable furnace for smelting and casting, and obtain a tube blank;

[0033] S2: hot-forging the tube blank obtained in the above S1 in advance, that is, placing it in a furnace at 1000°C for 1 hour;

[0034] S3: Squeeze and deform the hot-forged tube billet of S2 with an extrusion ratio of 15 and an extrusion speed of 85mm / s; then place it in a furnace at 470°C for 1.0h to obtain a semi-finished pipe;

[0035] S4: Anneal the semi-finished pipe product after S3 rolling, that is, keep it at 700°C for 1h; Insulate at 915°C for 2 hours, and air cool to obtain titanium alloy pipes;

[0036]S5: pre-stretch the titanium alloy pipe prepared in S4, and apply 1.0% pre-stretch deformation; then artificially age...

Embodiment 2

[0039] A method for manufacturing a 930MPa grade Ti-Al-V-Zr-Ru corrosion-resistant titanium alloy pipe, comprising the steps of:

[0040] S1: According to the mass percentage Al: 5.8%, V: 3.0%, Zr: 1.7%, Ru: 0.1%, weigh the raw materials, place them in a vacuum consumable furnace for smelting and casting, and obtain a tube blank;

[0041] S2: hot-forging the tube blank obtained in the above S1 in advance, that is, placing it in a furnace at 980°C for 1.5 hours;

[0042] S3: Squeeze and deform the hot-forged tube billet of S2 with an extrusion ratio of 30 and an extrusion speed of 95mm / s; then place it in a furnace at 400°C for rolling for 1.5 hours to obtain a semi-finished pipe;

[0043] S4: Anneal the semi-finished pipe after S3 rolling, that is, keep it at 650°C for 1.2h; Insulate at 910°C for 2 hours, and air-cool to obtain titanium alloy pipes;

[0044] S5: pre-stretch the titanium alloy pipe produced in S4, and apply a pre-stretch deformation of 1.5%; then artificially...

Embodiment 3

[0047] A method for manufacturing a 930MPa grade Ti-Al-V-Zr-Ru corrosion-resistant titanium alloy pipe, comprising the steps of:

[0048] S1: According to the mass percentage Al: 6.5%, V: 2.0%, Zr: 1.0%, Ru: 0.3%, weigh the raw materials, place them in a vacuum consumable furnace for smelting and casting, and obtain the tube blank;

[0049] S2: hot-forging the tube blank obtained in the above S1 in advance, that is, placing it in a furnace at 1050°C for 0.8h;

[0050] S3: Squeeze and deform the tube billet after hot forging in S2, the extrusion ratio is 45, and the extrusion speed is 110mm / s; then place it in a furnace at 500°C for rolling for 0.5h to obtain a semi-finished pipe;

[0051] S4: Perform annealing treatment on the semi-finished pipe product after S3 rolling, that is, keep it at 750°C for 0.8h; Insulate at 920°C for 2 hours, and air-cool to obtain titanium alloy pipes;

[0052] S5: pre-stretch the titanium alloy pipe produced in S4, and apply 2.0% pre-stretch def...

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Abstract

The invention discloses a 930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material and a preparation method thereof and belongs to the technical field of petroleum and natural gas industry oil well pipe manufacturing. The 930MPa-grade anti-corrosion Ti-Al-V-Zr-Ru titanium alloy pipe material is composed of, by mass, 5.8-6.5% of Al, 2.0-3.0% of V, 1.0-1.7% of Zr, 0.5-1.0% of Mo, 0.1-0.3% of Ru and the balance Ti and inevitable impurities. The preparation method comprises the steps of smelting, casting, forging, extruding, rolling, annealing treatment, solid solution treatment, pre-stretching treatment and aging treatment. According to a titanium alloy drill stem obtained through the above process route, the yield strength is larger than 930 MPa, and the corrosion resistance isgood.

Description

technical field [0001] The invention belongs to the technical field of manufacturing oil well pipes in the petroleum and natural gas industry, and relates to a 930MPa grade Ti-Al-V-Zr-Ru corrosion-resistant titanium alloy pipe and a preparation method thereof. Background technique [0002] With the increasing demand for oil and gas resources at home and abroad, it is urgent to develop some deep wells, ultra-deep wells, horizontal wells and offshore oil and gas fields to meet the demand. At home and abroad, due to Cl - , CO 2 , H 2 The problem of oil well pipe corrosion failure caused by S has been fully researched and discussed and technological reform and innovation have been carried out, and many protective measures have been used, such as the development of sulfur-resistant drill pipe, aluminum alloy drill pipe and the use of nickel-based alloy oil well pipe, and here On the basis of adding corrosion inhibitor, coating the inner wall of oil casing with anti-corrosion c...

Claims

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Application Information

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IPC IPC(8): C22C14/00C22C1/02C22F1/18
CPCC22C1/02C22C14/00C22F1/183
Inventor 冯春李睿哲朱丽娟蒋龙韩礼红
Owner BC P INC CHINA NAT PETROLEUM CORP
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