Super-strength aluminum alloy drill rod pipe body for super-deep well and manufacturing method for super-strength aluminum alloy drill rod pipe body

Abstract

The invention discloses a super-strength aluminum alloy drill rod pipe body for a super-deep well and a manufacturing method for the super-strength aluminum alloy drill rod pipe body. The super-strength aluminum alloy drill rod pipe body comprises the following components in percentage by weight: 2.1 to 3.0 percent of Cu, 2.8 to 3.1 percent of Mg, 10.0 to 12.9 percent of Zn, 0.1 to 0.3 percent of Mn, 0.1 to 0.5 percent of Ni, 0.1 to 0.5 percent of Cr, 0.05 to 0.20 percent of Ti, 0.2 to 0.5 percent of Zr, 0.001 to 0.01 percent of B, 0.02 to 0.05 percent of Yb and the balance of Al and inevitable impurities. According to the super-strength aluminum alloy drill rod pipe body and the manufacturing method, heat treatment processes of multistage homogenization treatment, multistage solid solution treatment, aging and the like are adopted, segregation, heterogeneousness and the like in a substrate are greatly eliminated, and the melting-back of an un-melted eutectic phase in the aluminum alloy substrate is remarkably promoted, so that high strength is maintained, hot strength is improved, and the problems of insufficient strength, low surface hardness, insufficient hot strength and the like of the conventional aluminum alloy drill rod pipe body are solved.

Description

technical field

[0001] The invention relates to the technical field of oil pipe manufacturing, in particular to an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells and a manufacturing method thereof. Background technique

[0002] With the development of the petroleum industry, the number of ultra-deep wells and horizontal wells continues to increase, making exploration and development more difficult. Compared with existing steel drill pipes, aluminum alloy drill pipes have the advantages of light weight, good toughness, hydrogen sulfide corrosion resistance, fatigue resistance, etc., and have broad application prospects.

[0003] For the aluminum alloy drill pipe body, due to the specific service conditions of ultra-deep wells, the upper bearing drill string is required to have extremely high strength and certain heat resistance. The 7000 series alloy is the strongest and toughest alloy among aluminum alloys produced by traditional ingot metallurgy, b...

Examples

Embodiment 1

[0033] An ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. In terms of weight percentage, the composition of the aluminum alloy drill pipe body for ultra-deep wells includes: Cu2.9%, Mg2.8%, Zn10.0%, Mn0. 3%, Fe0.3%, Ni0.5%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.02%, the balance is Al and unavoidable impurities.

[0034] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, 435 ℃ extrusion deformation, solution quenching treatment at 455℃×2h+470℃×1h, artificial aging treatment for 36h after pre-stretching deformation 4.0%.

[0035] The mechanical properties of the aluminum alloy drill pipe body manufactured by the above method reach: the tensile strength is 735MPa, the yield strength is 704MPa, and the elongation is 8.5%; after 500 hours of heat exposure at 120°C,...

Embodiment 2

[0037] The invention provides an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The composition of the aluminum alloy drill pipe body for ultra-deep wells includes Cu2.1%, Mg2.8%, Zn10.9%. Mn0.3%, Fe0.3%, Ni0.3%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.02%, the balance is Al and unavoidable impurities.

[0038] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the above-mentioned tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, Extrusion deformation at 440°C, solution quenching treatment at 455°C×2h+470°C×1h, artificial aging treatment for 12h after pre-stretching deformation 4.0%.

[0039] The mechanical properties of the aluminum alloy drill pipe body manufactured by the above method reach: the tensile strength is 713MPa, the yield strength is 675MPa, and the elongation is 8.0%; after 500 hours of heat exposur...

Embodiment 3

[0041]An ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. In terms of weight percentage, the composition of the aluminum alloy drill pipe body for ultra-deep wells includes: Cu2.3%, Mg3.1%, Zn11.9%, Mn0. 3%, Fe0.3%, Ni0.3%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.05%, the balance is Al and unavoidable impurities.

[0042] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the above-mentioned tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, Extrusion deformation at 440°C, solution quenching treatment at 455°C×2h+470°C×1h, artificial aging treatment for 48h after pre-stretching deformation 4.0%.

[0043] The mechanical properties of the aluminum alloy manufactured by the above method reach: the tensile strength is 740MPa, the yield strength is 719MPa, and the elongation is 8.5%. 709MPa, elongation 7.0%. Its perform...

technical field

[0001] The invention relates to the technical field of oil pipe manufacturing, in particular to an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells and a manufacturing method thereof. Background technique

[0002] With the development of the petroleum industry, the number of ultra-deep wells and horizontal wells continues to increase, making exploration and development more difficult. Compared with existing steel drill pipes, aluminum alloy drill pipes have the advantages of light weight, good toughness, hydrogen sulfide corrosion resistance, fatigue resistance, etc., and have broad application prospects.

[0003] For the aluminum alloy drill pipe body, due to the specific service conditions of ultra-deep wells, the upper bearing drill string is required to have extremely high strength and certain heat resistance. The 7000 series alloy is the strongest and toughest alloy among aluminum alloys produced by traditional ingot metallurgy, b...

Examples

Embodiment 1

[0033] An ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. In terms of weight percentage, the composition of the aluminum alloy drill pipe body for ultra-deep wells includes: Cu2.9%, Mg2.8%, Zn10.0%, Mn0. 3%, Fe0.3%, Ni0.5%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.02%, the balance is Al and unavoidable impurities.

[0034] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, 435 ℃ extrusion deformation, solution quenching treatment at 455℃×2h+470℃×1h, artificial aging treatment for 36h after pre-stretching deformation 4.0%.

[0035] The mechanical properties of the aluminum alloy drill pipe body manufactured by the above method reach: the tensile strength is 735MPa, the yield strength is 704MPa, and the elongation is 8.5%; after 500 hours of heat exposure at 120°C,...

Embodiment 2

[0037] The invention provides an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The composition of the aluminum alloy drill pipe body for ultra-deep wells includes Cu2.1%, Mg2.8%, Zn10.9%. Mn0.3%, Fe0.3%, Ni0.3%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.02%, the balance is Al and unavoidable impurities.

[0038] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the above-mentioned tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, Extrusion deformation at 440°C, solution quenching treatment at 455°C×2h+470°C×1h, artificial aging treatment for 12h after pre-stretching deformation 4.0%.

[0039] The mechanical properties of the aluminum alloy drill pipe body manufactured by the above method reach: the tensile strength is 713MPa, the yield strength is 675MPa, and the elongation is 8.0%; after 500 hours of heat exposur...

Embodiment 3

[0041]An ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. In terms of weight percentage, the composition of the aluminum alloy drill pipe body for ultra-deep wells includes: Cu2.3%, Mg3.1%, Zn11.9%, Mn0. 3%, Fe0.3%, Ni0.3%, Cr0.5%, Ti0.20%, Zr0.2%B0.001%, Yb0.05%, the balance is Al and unavoidable impurities.

[0042] A method for manufacturing an ultra-high-strength aluminum alloy drill pipe body for ultra-deep wells. The above-mentioned raw materials are smelted and cast to obtain a tube blank, and the above-mentioned tube blank is homogenized at 380°C×8h+420°C×12h+460°C×32h, Extrusion deformation at 440°C, solution quenching treatment at 455°C×2h+470°C×1h, artificial aging treatment for 48h after pre-stretching deformation 4.0%.

[0043] The mechanical properties of the aluminum alloy manufactured by the above method reach: the tensile strength is 740MPa, the yield strength is 719MPa, and the elongation is 8.5%. 709MPa, elongation 7.0%. Its perform...

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