Pipe for aluminum alloy drilling rod of deep and ultra-deep wells and manufacturing method thereof

Abstract

The invention discloses a pipe for an aluminum alloy drilling rod of deep and ultra-deep wells and a manufacturing method thereof, and belongs to the technical field of petroleum pipe manufacture. The pipe comprises, by weight, 4.8-5.8% of Cu, 1.2-1.8% of Mg, 1.0-1.2% of Mn, 0.05-0.20% of Ti, 0.5-0.6% of Zn, 0.001-0.01% of B, 0.02-0.05% of Yb and the balance Al and unavoidable impurities. Through Cu precipitation strengthening, Mn solid solution strengthening and grain refinement at a specific temperature, Zn and Mg precipitation strengthening and Yb-B-Ti-combined use grain refinement, the synergism effects of solid solution strengthening, precipitation strengthening and grain refinement are obtained. A pipe blank is casted and the ingot casting is subjected to homogenization, extrusion and solid solution, a pipe blank homogenization temperature is in a range of 480-505 DEG C, and a pipe blank extrusion temperature is in a range of 400-450 DEG C. The manufacturing method is free of heat treatment processes such as solid-solution quenching and long-term aging, can carry out direct natural aging treatment on the quenched pipe subjected to pre-deformation and can simplify production processes and reduce environmental pollution.

Description

technical field

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

[0002] With the development of the petroleum industry, the number of deep wells, ultra-deep wells and horizontal wells is increasing, 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 deep wells and ultra-deep wells, it is required to have good strength and toughness, and at the same time have a certain heat resistance. The 2000 series alloy is the most thermally strong alloy among the aluminum alloys produced by the traditional ingot m...

Examples

Embodiment 1

[0038] Embodiment 1: as figure 1 , figure 2 , image 3 as shown,

[0039] An aluminum alloy drill pipe body for deep and ultra-deep wells and a manufacturing method thereof,

[0040] The invention provides an aluminum alloy drill pipe body for deep and ultra-deep wells, which is composed of (mass percentage): Cu4.9%, Mg1.8%, Mn1.1%, Ti0.05%, Zn0.5%, B0 .005%, Yb0.02%, the balance is Al and unavoidable impurities.

[0041] The above-mentioned tube blank is homogenized at 480°C, extruded at 420°C, solid solution quenched at 485°C×1h+495°C×1h, air-cooled and aged to room temperature naturally.

[0042] The mechanical properties of the aluminum alloy treated by the above method reach: the tensile strength is 505MPa, the yield strength is 367MPa, and the elongation is 13.5%. 311MPa, elongation 12.3%. Its performance index fully meets the requirements of ISO15546 standard for aluminum alloy drill pipe body. In this example, after heat exposure at 120°C for 500h, the structur...

example 12

Embodiment 2

[0044] The invention provides an aluminum alloy drill pipe body for deep and ultra-deep wells, which is composed of (mass percentage): Cu5.2%, Mg1.6%, Mn1.0%, Ti0.05%, Zn0.5%, B0 .005%, Yb0.05%, the balance is Al and unavoidable impurities.

[0045] The above-mentioned tube blank is homogenized at 490°C, extruded at 435°C, solid solution quenched at 490°C×1h+505°C×1h, air-cooled and aged to room temperature naturally.

[0046] The mechanical properties of the aluminum alloy treated by the above method reach: the tensile strength is 517MPa, the yield strength is 407MPa, and the elongation is 13.0%. 317MPa, elongation 13.0%. Its performance index fully meets the requirements of ISO15546 standard for aluminum alloy drill pipe body. In this example, after heat exposure at 160°C for 500h, the structure of the transmission electron microscope can be seen figure 2 .

technical field

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

[0002] With the development of the petroleum industry, the number of deep wells, ultra-deep wells and horizontal wells is increasing, 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 deep wells and ultra-deep wells, it is required to have good strength and toughness, and at the same time have a certain heat resistance. The 2000 series alloy is the most thermally strong alloy among the aluminum alloys produced by the traditional ingot m...

Examples

Embodiment 1

[0038] Embodiment 1: as figure 1 , figure 2 , image 3 as shown,

[0039] An aluminum alloy drill pipe body for deep and ultra-deep wells and a manufacturing method thereof,

[0040] The invention provides an aluminum alloy drill pipe body for deep and ultra-deep wells, which is composed of (mass percentage): Cu4.9%, Mg1.8%, Mn1.1%, Ti0.05%, Zn0.5%, B0 .005%, Yb0.02%, the balance is Al and unavoidable impurities.

[0041] The above-mentioned tube blank is homogenized at 480°C, extruded at 420°C, solid solution quenched at 485°C×1h+495°C×1h, air-cooled and aged to room temperature naturally.

[0042] The mechanical properties of the aluminum alloy treated by the above method reach: the tensile strength is 505MPa, the yield strength is 367MPa, and the elongation is 13.5%. 311MPa, elongation 12.3%. Its performance index fully meets the requirements of ISO15546 standard for aluminum alloy drill pipe body. In this example, after heat exposure at 120°C for 500h, the structur...

example 12

Embodiment 2

[0044] The invention provides an aluminum alloy drill pipe body for deep and ultra-deep wells, which is composed of (mass percentage): Cu5.2%, Mg1.6%, Mn1.0%, Ti0.05%, Zn0.5%, B0 .005%, Yb0.05%, the balance is Al and unavoidable impurities.

[0045] The above-mentioned tube blank is homogenized at 490°C, extruded at 435°C, solid solution quenched at 490°C×1h+505°C×1h, air-cooled and aged to room temperature naturally.

[0046] The mechanical properties of the aluminum alloy treated by the above method reach: the tensile strength is 517MPa, the yield strength is 407MPa, and the elongation is 13.0%. 317MPa, elongation 13.0%. Its performance index fully meets the requirements of ISO15546 standard for aluminum alloy drill pipe body. In this example, after heat exposure at 160°C for 500h, the structure of the transmission electron microscope can be seen figure 2 .

Images