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Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof

An aluminum-based alloy, water medium technology, applied in the field of aluminum alloy materials, can solve the problem that tools such as soluble bridge plugs and ball seats have not yet been developed.

Inactive Publication Date: 2016-09-21
INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In response to the above problems, many oil companies have developed fracturing tools that are soluble in water and water medium environments, such as: fracturing balls made of resin, magnesium or aluminum composite materials, and tools such as soluble bridge plugs and ball seats not yet developed

Method used

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  • Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof
  • Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof
  • Aluminum base alloy soluble in water and aqueous medium environments and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] By alloy Al 91 Mg 3 Cu 1 Si 0.2 Ti 0.1 Ga 3.2 In 1 sn 0.5 The mass ratio of each metal is accurately weighed, and the aluminum is first melted in a crucible melting furnace, and the melting temperature of the alloy is 730°C. The other metals to be added are melted, and a layer of slag-removing covering agent (a mixture of KCl and MgCl) is sprinkled on the surface of the molten aluminum. Add aluminum titanium boron (Al 94 Ti 5 B) After the grain refiner, the molten aluminum is refined for 15 minutes. After the molten aluminum is left to stand for a period of time, the oxidized slag on the surface of the molten aluminum is removed. The molten aluminum is cast in the mold, and after the molten aluminum is completely solidified, the cast alloy is put into a quenching furnace and heated to 490°C for 1.5 hours. The alloy is taken out and quenched in oil, and after quenching, the casting is kept in an aging furnace at 180°C for 16 hours.

[0026] The average grain ...

Embodiment 2

[0028] Repeat the process of Example 1 to prepare Al 90 Mg 4 Cu 2 Si 0.2 Ti 0.1 Ga 2.5 In 0.8 sn 0.4 alloy. The quenching temperature is 470°C, and the temperature is kept for 1.2 hours. The alloy is quenched in oil, and the aging temperature of the casting after quenching is 160°C for 18 hours. The yield strength of the alloy is 332MPa, and the alloy is not broken when the deformation exceeds 25%. The alloy has a hardness value of 158 under a 200g load.

[0029] The alloy starts to react with water at 58°C, and the average dissolution rate of a cube alloy with a size of 2cm at a water temperature of 90°C is 2.4g / h (Table 1). Compared with the alloy in Example 1, the alloy has lower strength, lower initial reaction temperature, and lower dissolution rate.

Embodiment 3

[0031] Repeat the process of Example 1 to prepare Al 91Mg 3.5 Cu 1 Ga 3 In 1 sn 0.5 alloy. The quenching temperature of the alloy is 470°C, and the temperature is kept for 1.8 hours. The aging temperature is 190°C, and the temperature is kept for 18 hours. The yield strength of the alloy during compression is 305MPa, and the alloy is not broken when the deformation exceeds 25%. The alloy has a hardness value of 130 under a 200g load.

[0032] The alloy starts to react with water at 50°C, and the average dissolution rate of a cube alloy with a size of 2cm at a water temperature of 90°C is 6.6g / h (Table 1). Compared with the alloy in Example 1, the yield strength and hardness of the alloy are greatly reduced, the initial reaction temperature is lowered, and the dissolution rate is increased.

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Abstract

The invention discloses an aluminum base alloy soluble in water and aqueous medium environments and a preparation method thereof. The alloy is composed of, by weight, 90%-94% of Al, 1.8%-4.8% of low-melting-point metals and 2.5%-7.6% of reinforced aluminum alloy elements. The low-melting-point metals include Ga, In, Sn, Bi and Pb, wherein the Ga, In and Sn are essential elements in the alloy; one or both of Bi and Pb can be added in the alloy, but the content of the Pb cannot exceed 0.3% by weight; and the reinforced aluminum alloy elements include one or more of Ti, Cu, Fe, Mg, Zn, Mn, Si, Li, Zr, Y and Gd, wherein the Cu and Mg are essential elements in the alloy. The aluminum base alloy soluble in the water and aqueous medium environments is smelted under normal pressure and then poured into a mould for making a casting, and a product is formed after solid solution and aging treatment. The initial reaction temperature and the dissolution rate of the obtained product in the water and aqueous medium environments can be adjusted and controlled. The alloy is large in strength and can be used for manufacturing soluble down-hole tools, and the manufactured tools can automatically decompose in high-temperature and high-pressure watery environments.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and provides an aluminum alloy and a preparation method thereof for preparing downhole tools soluble in water and water medium environments. The soluble aluminum alloy products can be used to prepare fracturing tools for oil drilling. Background technique [0002] Hydraulic fracturing technology is an enhanced recovery technology applied to low-abundance and low-permeability oil and gas fields. This technology injects high-pressure fracturing fluid (~70MPa) into the well to fracture the formation, and uses the proppant in the fracturing fluid to fill the fractures to change the seepage mode of oil and gas to achieve oil and gas stimulation. In order to apply pressure to the fracturing fluid in the pipe string, tools such as fracturing balls and bridge plugs are used to seal off the construction pipe strings in different working layers during the construction process, and then fracturing st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/00C22C21/06C22C21/16C22F1/04C22F1/057C22F1/047E21B43/26
CPCC22C21/00C22C21/06C22C21/16C22F1/04C22F1/047C22F1/057E21B43/26
Inventor 汪伟陈德敏陈伟杜邦登杨柯
Owner INST OF METAL RESEARCH - CHINESE ACAD OF SCI
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