Fresh water dissolvable aluminum alloy

Patent metadata

Field	Value
Publication number	US-2021254195-A1
Application number	US-202016789823-A
Country	US
Kind code	A1
Filing date	Feb 13, 2020
Priority date	Feb 13, 2020
Publication date	Aug 19, 2021
Grant date	—

Abstract

A dissolvable aluminum alloy can be used for components of a downhole tool in hydraulic fracturing operations with low salinity fluid at low temperatures, including fresh water. The dissolvable aluminum alloy can be dissolved completely and controlled at a dissolving rate compatible with hydraulic fracturing operations. The alloy comprises aluminum having grain boundaries, magnesium at 8.25-12% by weight, gallium at 2.5-4% by weight, and indium at 2-4% by weight. At least portions of magnesium, gallium, and indium are located in the grain boundaries. There are secondary phase particles, including Al—Mg Beta, Mg2Si, Mg and Al—Ga Gamma phases at the grain boundaries.

First claim

We claim:

1 . A dissolvable alloy for components of a downhole tool, comprising:
aluminum having grain boundaries; magnesium at 8.25-12% by weight; gallium at 2.5-4% by weight; and indium at 2-4% by weight, wherein at least portions of magnesium, gallium, and indium are located in said grain boundaries so as to be dissolvable a salinity between 0-3% by weight at temperatures between 50-60° C. with a dissolving rate less than 100 mg/cm2/hr.

2 . The dissolvable alloy of claim 1 , wherein said aluminum, said magnesium, and said gallium are comprised of secondary phases, said secondary phases being Al—Mg Beta phases, Mg phases, and Al—Ga Gamma phases.

3 . The dissolvable alloy of claim 2 , wherein at least portions of said secondary phases are located in said grain boundaries.

4 . The dissolvable alloy of claim 2 , wherein said secondary phases are comprised of 10 Mo. % Al—Mg Beta phases, 0.85 Mol. % Mg phases, and 0.2 Mol. % Al—Ga Gamma phases.

5 . The dissolvable alloy of claim 1 , further comprising: silicon at 0.2-0.4% by weight.

6 . The dissolvable alloy of claim 5 , wherein said aluminum, said magnesium, said gallium, and said silicon are comprised of secondary phases, said secondary phases being Al—Mg Beta phases, Mg2Si phases, Mg phases, and Al—Ga Gamma phases.

7 . The dissolvable alloy of claim 5 , wherein said secondary phases are comprised of 10 Mo. % Al—Mg Beta phases, 2.3 Mol. % Mg2Si, 0.85 Mol. % Mg phases, and 0.2 Mol. % Al—Ga Gamma phases.

8 . The dissolvable alloy of claim 1 , further comprising: tin at 1.0-3.0% by weight.

9 . The dissolvable alloy of claim 1 , further comprising: manganese at less than 0.2% by weight.

10 . The dissolvable alloy of claim 1 , wherein magnesium is 8.5% by weight, wherein gallium is 5.0% by weight, and wherein indium is 3.0% by weight.

11 . The dissolvable alloy of claim 1 , wherein the dissolving rate is 20-40 mg/cm2/hr in deionized water at 50° C.

12 . The dissolvable alloy of claim 1 , wherein the dissolving rate is 35-55 mg/cm2/hr in 3% KCI at 50° C.

13 . The dissolvable alloy of claim 1 , wherein the dissolving rate is 60-90 mg/cm2/hr in 1% KCI at 60° C.

14 . The dissolvable alloy of claim 1 , wherein the dissolving rate is 240-400 mg/cm2/hr in 1% KCI at 93° C.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc

Inventors

• Xu Jianhui
• Dunne Timothy
• Sang Yu
• Song Yi
• Yue Wenhan
• Liu Yu
• Yang Xiongwen

Classifications

• E21B2200/08

  Down-hole devices using materials which decompose under well-bore conditions · CPC title

• C22C21/06

  with magnesium as the next major constituent · CPC title

• C22C21/08 Primary

  with silicon · CPC title

• E21B33/12

  Packers; Plugs (used for cementing E21B33/134, E21B33/16) · CPC title