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High-strength and high-toughness titanium alloy pipe for oil and gas development and preparation method thereof

A titanium alloy and high-strength technology, which is applied in the field of high-strength and high-toughness titanium alloy pipes and their preparation, can solve the problems of titanium alloy pipes that are difficult to meet in terms of strength and toughness, and achieve excellent mechanical properties, convenient preparation and processing, and excellent mechanical properties. Effect

Active Publication Date: 2021-11-23
BC P INC CHINA NAT PETROLEUM CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem that the strength and toughness of existing titanium alloy pipes are difficult to meet the environmental requirements of oil and gas fields such as ultra-deep and high pressure, and to provide a high-strength and high-toughness titanium alloy pipe and its preparation method. The oil pipe has high strength, high toughness and good fatigue performance, which can meet the needs of oil and gas exploitation

Method used

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  • High-strength and high-toughness titanium alloy pipe for oil and gas development and preparation method thereof
  • High-strength and high-toughness titanium alloy pipe for oil and gas development and preparation method thereof
  • High-strength and high-toughness titanium alloy pipe for oil and gas development and preparation method thereof

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preparation example Construction

[0029] The invention provides a high-strength and high-toughness titanium alloy drilling tool pipe composition design and preparation method used in oil and gas development of deep wells and ultra-deep wells. The oil pipes made of titanium alloy materials are used in meeting the severe oil and gas development conditions in China. In addition to corrosion resistance, it also has high strength, high toughness and good fatigue performance.

[0030] The high-strength and high-toughness titanium alloy material of the present invention is composed of the following components by mass percentage, Al: 3.8-5.0%, V: 2.4-3.3%, Fe: 1.3-1.8%, Nb: 0.4-0.8%, Ni: 0.3-1.0 %, O ≤ 0.2%, C ≤ 0.04%, N ≤ 0.04%, H ≤ 0.0135%, the balance is Ti; on this basis, one of Cr: 0.15-0.35%, Mo: 0.05-1.0% can also be added One or two alloying elements.

[0031] In the alloy composition of the present invention, a small amount of Fe element is used to replace part of V element with higher price. Fe element is ...

Embodiment 1

[0042] The composition of the high-strength and high-toughness titanium alloy material used in the oil and gas development of deep wells and ultra-deep wells of the present invention is composed of Al: 4.53%; V: 3.11%; Fe: 1.69%; Ni: 0.33%; Nb: 0.77%; O: 0.12%; C: 0.035%; N: 0.007%; H: 0.0131%; Mo: 0.09%, and the balance is Ti.

[0043] The preparation processing method of above titanium alloy tube comprises the following steps:

[0044] 1) The titanium alloy composition with the above ratio is dispersed and batched and then pressed into an electrode. It is melted in a vacuum consumable furnace for three times and vacuum smelted to form an ingot. The outer diameter of the ingot is 400 mm, and there is no obvious iron element segregation. ;

[0045] After peeling the ingot, cutting the riser, removing the bottom pad, and sampling and analyzing the chemical composition, the ingot is heated to a temperature of 1000-1050 °C, and the temperature is lowered for more than two times ...

Embodiment 2

[0051] The composition of the high-strength and high-toughness titanium alloy material used in the oil and gas development of deep wells and ultra-deep wells of the present invention is composed of Al: 4.92%; V: 2.56%; Fe: 1.41%; Ni: 0.89%; Nb: 0.51%; O: 0.13%; C: 0.028%; N: 0.016%; H: 0.0134%; Mo: 0.88%, Cr: 0.19%; the balance is Ti;

[0052] The preparation and processing method of the above-mentioned titanium alloy tube comprises the following steps:

[0053] 1) The titanium alloy composition with the above ratio is dispersed and batched, then pressed into an electrode, melted in a vacuum consumable furnace for three times and vacuum smelted to form an ingot. The outer diameter of the ingot is 600 mm, and there is no obvious iron element segregation ;

[0054] After peeling the ingot, cutting the riser, removing the bottom pad, and sampling and analyzing the chemical composition, the ingot is heated to a temperature of 1000-1050 °C, and the temperature is lowered for more ...

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Abstract

The invention relates to a high-strength and high-toughness titanium alloy pipe for oil and gas development and a preparation method thereof, so as to ensure the safe and effective exploitation of oil and gas wells, and mainly solve the problem that the strength and toughness of existing titanium alloy pipes cannot meet the requirements of ultra-deep and high-pressure oil and gas wells. environmental characteristics. Except for Ti, the titanium alloy pipe is mainly composed of the following components by mass percentage, Al: 3.8-5.0%, V: 2.4-3.3%, Fe: 1.3-1.8%, Nb: 0.4-0.8%, Ni: 0.3-1.0 %, O ≤ 0.2%, C ≤ 0.04%, N ≤ 0.04%, H ≤ 0.0135%, also add one or two of the following alloying elements, Cr: 0.15-0.35%, Mo: 0.05-1.0%. At the same time, the present invention also provides a method for preparing the above-mentioned titanium alloy tube.

Description

technical field [0001] The invention relates to the field of pipes for oil and gas development in the petroleum and natural gas industry, in particular to a high-strength and high-toughness titanium alloy pipe used in oil and gas development of deep wells and ultra-deep wells and a preparation method thereof, so as to ensure safe and effective exploitation of oil and gas wells. Background technique [0002] With the further deepening of oil and gas development, the development of many western and southwestern oil and gas fields in China has high temperature (greater than 140°C), high pressure (greater than 100MPa), well depth (greater than 5000m), and high corrosive media (CO 2 、H 2 S, CL － ) and other harsh environments; in order to meet the corrosion resistance requirements of oil and gas field development for tubing and casing, considering that titanium alloy materials have excellent characteristics such as high strength, excellent corrosion resistance, low elastic modul...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C14/00C22C1/02C22F1/02C22F1/18E21B17/00
Inventor 刘强宋生印白强田峰汪蓬勃杨专钊王远
Owner BC P INC CHINA NAT PETROLEUM CORP
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