Dissolvable magnesium alloy

Patent metadata

Field	Value
Publication number	US-2023392235-A1
Application number	US-202217805368-A
Country	US
Kind code	A1
Filing date	Jun 3, 2022
Priority date	Jun 3, 2022
Publication date	Dec 7, 2023
Grant date	—

Abstract

A dissolvable magnesium alloy can be used for components of a downhole tool. The dissolvable magnesium alloy can be dissolved completely and controlled at a dissolving rate so as to be compatible with downhole operations, including hydraulic fracturing operations. The alloy includes nickel at 0.04-0.4% by weight and the balance of magnesium. The alloy is dissolvable in KCl at 2.1% by weight and 95 QC with a dissolving rate in a range of 10-100 mg/cm2/hr, yield strength in a range of 18-37 ksi, ultimate tensile strength in a range of 29-47 ksi, and elongation in a range of 8-40%.

First claim

1 . A dissolvable alloy for a component of a downhole tool, comprising:
from 0.04 to 0.4 wt % nickel; 1.4 wt %-2.0 wt % copper; 3.1 wt %-15 wt % gadolinium; 4.0 wt %-15 wt % yttrium; 0.5 wt %-3.3 wt % aluminum; and at least 83.5 wt % magnesium so as to be dissolvable in KCl at 2.1% by weight and 93° C. with a dissolving rate in a range of from 10 to 100 mg/cm 2 /hr, yield strength in a range of from 25 to about 37 ksi, ultimate tensile strength in a range of from 35 to 45 ksi, and elongation in a range of from 10 to 19%, wherein the dissolvable alloy does not have Zr.

2 . The dissolvable alloy of claim 1 further comprising 0-20% lithium by weight, 3.1% gadolinium by weight, 4% yttrium by weight, 1.4% copper by weight.

3 . The dissolvable alloy of claim 2 , further comprising up to 10 wt % total of other elements. which comprises one of manganese, neodymium, cerium, calcium, iron, bismuth, indium, or silver.

4 . (canceled)

5 . The dissolvable alloy of claim 3 , wherein said copper is 1.4 wt %, said aluminum is 10.1 wt %, said zinc is 0.45 wt %, said nickel is 0.15 wt %, and said manganese is 0.16 wt %.

6 . The dissolvable alloy of claim 2 , wherein said copper is 0.4 wt %, said nickel is 0.04 wt %, and said aluminum is 0.5 wt %.

7 . The dissolvable alloy of claim 2 , wherein said gadolinium is 3.1 wt %, said copper is 1.4 wt %, said nickel is 0.04 wt %, and said aluminum is about 0.5 wt %.

8 . The dissolvable alloy of claim 2 , wherein said gadolinium is 3.1 wt %, said copper is 0.4 wt %, said nickel is 0.04 wt %, and said aluminum is 0.5 wt %.

9 . The dissolvable alloy of claim 2 , wherein said copper is 0.4 wt %, said nickel is 0.15 wt %, and said aluminum is 5.6 wt %.

10 . The dissolvable alloy of claim 2 , wherein said copper is 1.2 wt %, said nickel is 0.4 wt %, and zinc is 6.1 wt %.

11 . The dissolvable alloy of claim 2 , wherein said gadolinium is 1.56 wt %, said nickel is 0.04 wt %, and wherein said zinc is 3.88 wt %.

12 . The dissolvable alloy of claim 2 , wherein said lithium is 11 wt %, said gadolinium is 1.0 wt %, said yttrium is 0.6 wt %, said nickel is 0.4 wt %, said copper is 0.2 wt %, and wherein said zinc is 3.3 wt %.

13 . An alloy, comprising:
0-20% lithium by weight, 0-15% gadolinium by weight, 0-15% yttrium by weight, 0-2% copper by weight, 0-15% aluminum by weight, 0.04% to about 0.4% nickel by weight; the balance of magnesium (Mg) and inevitable impurities, so as to be dissolvable in KCl at 2.1% by weight and about 93° C. with a dissolving rate in a range of from 10 to 100 mg/cm 2 /hr, yield strength in a range of from 25 to 37 ksi, ultimate tensile strength in a range of from 35 to 45 ksi, and elongation in a range of from 10 to 19%.

14 . The alloy of claim 13 , further comprising up to 10% total of other elements. which comprises one of manganese, neodymium, cerium, calcium, iron, bismuth, indium, or silver.

15 . The alloy of claim 13 , wherein the copper to nickel ratio is within the range of 50:1 to 0.1:1 wt %.

16 . The alloy of claim 15 , wherein said range of aluminum is 7 to 12 wt %, particularly when the range of aluminum to copper is in the range of 3.5:1 to 60:1 wt %.

17 . The alloy of claim 13 , wherein said range of zinc is 0.5 to 3 wt %, particularly when the range of copper to zinc is in the range of 0.07:1 to 4:1 wt %.

18 . An alloy, comprising:
0.04% to about 0.4% nickel by weight; 0.2% to about 2% copper by weight; and the balance of magnesium (Mg) and inevitable impurities, wherein the alloy yields strength in a range of from 25 to 37 ksi, ultimate tensile strength in a range of from 35 to ksi, and elongation in a range of from about 10 to about 19%.

19 . The alloy of claim 18 , further comprising lithium by weight, 0-15% gadolinium by weight, 0-15% yttrium by weight, 0-15% aluminum by weight.

20 . The alloy of claim 18 , further comprising up to 10 wt % total of other elements. which comprises one of manganese, neodymium, cerium, calcium, iron, bismuth, indium, or silver.

Assignees

• Cnpc Usa Corp
• Beijing Huamei Inc
• China Nat Petroleum Corp

Inventors

• Dunne Timothy
• Zhao Lei
• Ren Jiaxiang
• Cheng Peng
• Liu Yu

Classifications

• C22C23/00 Primary

  Alloys based on magnesium · CPC title

• C22C1/02

  by melting {(C22C1/1036 takes precedence)} · CPC title

• C22F1/06 Primary

  of magnesium or alloys based thereon · CPC title

• C22C23/02

  with aluminium as the next major constituent · CPC title