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Aluminum alloy for petroleum drill rod, manufacturing method of pipe thereof and pipe for petroleum drill rod

An oil drill pipe and aluminum alloy technology, which is applied in the field of aluminum alloy, can solve the problems of late start of research on aluminum alloy drill pipe technology, product dependence, and restrictions on the development of the oil drilling field, and achieve pinning dislocation suppression, strength and corrosion resistance Enhanced performance and high mechanical properties

Inactive Publication Date: 2020-03-27
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, my country's aluminum alloy drill pipe technology research started late, and the corresponding products still depend on imports, which greatly limits the development of my country's oil drilling field

Method used

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  • Aluminum alloy for petroleum drill rod, manufacturing method of pipe thereof and pipe for petroleum drill rod
  • Aluminum alloy for petroleum drill rod, manufacturing method of pipe thereof and pipe for petroleum drill rod
  • Aluminum alloy for petroleum drill rod, manufacturing method of pipe thereof and pipe for petroleum drill rod

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Preparation of pipes for petroleum drill pipes

[0037] (1) After smelting, refining, and casting, an aluminum alloy ingot is obtained. The aluminum alloy ingot is composed of the following components in terms of mass percentage: Zn: 6.0%, Mg: 1.7%, Cu: 1.2%, and Mn: 0.3 %, Cr: 0.16%, Er: 0.08%, Zr: 0.08%, Ti: 0.05%, the total amount of unavoidable impurities is ≤0.1%, and the balance is Al;

[0038] (2) The ingot obtained in step (1) is kept at 320°C for 10 hours and then heated to 460°C for 36 hours;

[0039] (3) Extruding the ingot processed in step (2) into a tube at a speed of 0.8m / min at 400°C;

[0040] (4) After straightening 0.8% of the tube blank obtained in step (3), first heat it up to 425°C at a rate of 40°C / h / after holding for 1 hour, and then at a speed of 40°C / h to 470°C / after holding 1.5h;

[0041] (5) The tube blank treated in step (4) is first heated to 105°C at a rate of 40°C / h, kept for 32 hours and then water quenched to room temperature, then heated to 175...

Embodiment 2

[0043] Preparation of pipes for petroleum drill pipes

[0044] (1) After smelting, refining, and casting, an aluminum alloy ingot is obtained. The aluminum alloy ingot is composed of the following components in terms of mass percentage: Zn: 6.2%, Mg: 1.8%, Cu: 1.3%, and Mn: 0.3 %, Cr: 0.15%, Er: 0.1%, Zr: 0.08%, Ti: 0.05%, the total amount of unavoidable impurities is ≤0.1%, and the balance is Al;

[0045] (2) The ingot obtained in step (1) is kept at 350°C for 10 hours and then heated to 470°C for 24 hours;

[0046] (3) Extruding the ingot processed in step (2) into a tube at a speed of 0.6m / min at 400°C;

[0047] (4) After 1% straightening of the tube blank obtained in step (3), the temperature is raised to 420°C at a rate of 35°C / h / after heat preservation for 2h, and then at a rate of 35°C / h to 465°C / after heat preservation 1h;

[0048] (5) The tube blank treated in step (4) is first heated to 100°C at a rate of 35°C / h, kept for 36 hours and then water quenched to room temperature,...

Embodiment 3

[0050] Preparation of pipes for petroleum drill pipes

[0051] (1) After smelting, refining, and casting, an aluminum alloy ingot is obtained. The aluminum alloy ingot is composed of the following components in terms of mass percentage: Zn: 5.9%, Mg: 1.8%, Cu: 1.1%, and Mn: 0.32 %, Cr: 0.15%, Er: 0.13%, Zr: 0.06%, Ti: 0.05%, the total amount of unavoidable impurities is ≤0.1%, and the balance is Al;

[0052] (2) The ingot obtained in step (1) is kept at 300°C for 12 hours and then heated to 470°C for 24 hours;

[0053] (3) Extruding the ingot processed in step (2) into a tube at a speed of 0.5m / min at 380°C;

[0054] (4) After 1% straightening of the tube blank obtained in step (3), the temperature is raised to 420°C at a rate of 35°C / h / after heat preservation for 2h, and then at a rate of 35°C / h to 465°C / after heat preservation 2h;

[0055] (5) The tube blank treated in step (4) is first heated to 100°C at a rate of 35°C / h, kept for 36 hours and then water quenched to room temperatur...

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Abstract

The invention relates to an aluminum alloy for a petroleum drill rod, a manufacturing method of a pipe thereof and the pipe for the petroleum drill rod, which belong to the technical field of aluminumalloy materials. The aluminum alloy is composed of the following components in percentages by mass: 5.9-6.3% of Zn, 1.6-2.0% of Mg, 1.1-1.5% of Cu, 0.3-0.35% of Mn, 0.14-0.16% of Cr, 0.03-0.13% of Er, 0.06-0.08% of Zr, 0.05% of Ti, less than or equal to 0.1% of inevitable impurities, and the balance Al. The aluminum alloy is used as a raw material and cooperates with a preparation process combining two-stage homogenization, two-stage solid solution and three-stage aging system, the pipe for the petroleum drill rod with high strength, corrosion resistance and high heat resistance can be prepared, and the manufacturing method of the pipe is simple and easy to operate, low in equipment requirement and suitable for expanded production.

Description

Technical field [0001] The invention belongs to the technical field of aluminum alloys, and in particular relates to a method for manufacturing an aluminum alloy for petroleum drill pipes and pipes thereof, and a pipe for petroleum drill pipes. Background technique [0002] In the field of oil drilling, a drill rod is a rod that connects a drill bit in a drilling tool to transmit power and transport mud. European and American countries have used 7075 aluminum alloy in the field of petroleum drilling. The tensile strength of the aluminum alloy is greater than 530MPa, and it has achieved good results in the actual drilling and mining process. However, the corrosion resistance of 7075 aluminum alloy is poor, especially in Cl - In the atmosphere, pitting corrosion and intergranular corrosion are prone to occur, which in turn leads to crack propagation and ultimately failure of the drill pipe. With the continuous deepening of petroleum exploration and development, the requirements for...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/10C22C1/02C22F1/053
CPCC22C1/026C22C21/10C22F1/002C22F1/053
Inventor 曹玲飞吴晓东王一唱黄光杰刘庆饶茂
Owner CHONGQING UNIV
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