High-strength high-impact-toughness titanium alloy used for oil well and gas well, and preparation method thereof

A titanium alloy, high-strength technology, applied in the field of titanium alloy materials, can solve the problems of insufficient corrosion resistance, unfavorable national security of nickel, corrosion leakage, etc., to improve tensile strength and lasting strength, benefit comprehensive performance, and reduce drilling rigs. The effect of power

Inactive Publication Date: 2014-01-08
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used high-chromium stainless steel pipes often have corrosion and leakage, which brings huge economic losses to production units and the people.
[0003] In addition to the problem of insufficient corrosion resistance, the use of nickel-based alloy pipes and stainless steel pipes as oil well pipes has the following problems: 1) Nickel used in large quantities in nickel-based alloys is a national strategic resource, and the consumption of oil well pipes is expected to be in demand in 2015 It will reach 6 million tons, and the extensive use of nickel is not good for national security
2) Nickel-based alloy pipes and stainless steel pipes have relatively large proportions, and have higher requirements for supporting drilling rigs
[0014] In terms of process adaptability, most of the high-strength and high-toughness titanium alloys developed in China need to undergo solution aging treatment. This process takes a long time and has high process costs, resulting in high product costs and it is difficult to achieve large-scale industrial production. Not conducive to promoting the application

Method used

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  • High-strength high-impact-toughness titanium alloy used for oil well and gas well, and preparation method thereof
  • High-strength high-impact-toughness titanium alloy used for oil well and gas well, and preparation method thereof
  • High-strength high-impact-toughness titanium alloy used for oil well and gas well, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 9% pure aluminum beans, 3% Nb blocks, 0.5% Mo blocks, 1% pure sponge Zr, and industrial grade sponge Ti are melted into alloy ingots twice through mixing, pressing electrode rods, and vacuum self-consumption . The transformation point of the alloy is 998°C, the billet is forged at 1150°C, and the forging is changed to Φ150 bar at 970°C. The mechanical properties of the bar at room temperature after annealing are shown in Table 3. The conditions of simulated oil well conditions were used, and the corrosion performance was assessed by bar test pieces. The test conditions and test performance are shown in Table 4.

Embodiment 2

[0035] 5.5% pure aluminum beans, 1% Nb block, 5% Mo block, and 3% pure sponge Zr industrial grade sponge Ti are melted twice into alloy ingots through mixing, pressing electrode rods, and vacuum self-consumption. The phase transition point of the alloy is 1005°C, the billet is forged at 1150°C, and then forged at 980°C to a ?150mm bar. After forming, a ?89×9 pipe is prepared. The mechanical properties of the pipe at room temperature after annealing are shown in Table 3. The simulated oil well working conditions were adopted, and the corrosion performance was assessed by pipe test pieces. The test conditions and test performance are shown in Table 4.

Embodiment 3

[0037] 4% pure aluminum beans, 5% Nb blocks, 3.5% Mo blocks, 5% pure sponge Zr, and industrial grade sponge Ti are melted twice into alloy ingots through mixing, pressing electrode rods, and vacuum self-consumption . The transformation point of the alloy is 993°C, the billet is forged at 1150°C, the slab is reforged at 1020°C to a thickness of 90mm, and the 14mm plate is rolled. The mechanical properties of the plate at room temperature after annealing are shown in Table 3. The simulated oil well working conditions were adopted, and the plate test piece was used for corrosion performance assessment. The test conditions and test performance are shown in Table 4.

[0038] Table 3 Mechanical properties at room temperature of three examples

[0039]

[0040] Table 4 Test conditions and results of simulated working condition evaluation

[0041]

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Abstract

The invention relates to high-strength high-impact-toughness titanium alloy comprising the chemical components of, by weight: 4.0-9.0% of Al, 0.5-5.0% of Mo, 1-5% of Nb, 1-5% of Zr, and balance of Ti. The preparation method comprises mixing, electrode rod pressing, vacuum consumption and twice smelting, such that an alloy ingot is prepared. The titanium alloy provided by the invention assists in well solving a problem of poor H2S and CO2 corrosion resistance of an existing P110 steel oil well and gas well pipe material. Also, 40% weight reduction can be realized, such that drilling rig power is greatly reduced. With the alloy, petroleum and natural gas exploration capacity of our nation can be greatly improved.

Description

technical field [0001] The invention belongs to the field of titanium alloy materials, and in particular relates to a high-strength and high-impact-toughness titanium alloy for oil and gas wells and a preparation method thereof. Background technique [0002] Nickel-based alloy pipes and high-chromium stainless steel pipes are often used in oil and gas drilling and extraction. However, with the shortage of oil resources, there are not many oil and gas wells with good well conditions and small depths. More and more oil and gas wells are concentrated in areas with relatively harsh underground environments, such as the Sichuan Basin, the main production area in my country. This is the case. The oil and gas wells in this area are rich in H2S and CO2, and the well conditions are quite bad. The commonly used high-chromium stainless steel pipes often suffer from corrosion and leakage, which brings huge economic losses to production units and the people. [0003] In addition to the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C14/00C22B9/20C22F1/18
Inventor 宋德军胡伟民李士凯
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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