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US 10,329,643 B2Granted
Corrodible downhole article
AssigneeMagnesium Elektron Limited
InventorsTimothy E. Wilks, Mark Turski
Life of this patent
Estimating the term…
Abstract
A corrodible downhole article includes a magnesium alloy. The magnesium alloy includes: 1-9 wt % Zn; 1-2 wt % Cu; 0.5-1.0 wt % Mn; and 0.1-5 wt % of a corrosion promoting element (e.g., Ni). The alloy can have a 0.2% proof strength of at least 150 MPa when tested using standard tensile test method ASTM B557-10.
Claims10
A corrodible downhole article comprising a magnesium alloy, the magnesium alloy comprising the following elements:
- 1-9 wt % Zn;
- 1-2 wt % Cu;
- 0.5-1.0 wt % Mn;
- and
- 0.1-5 wt % of a corrosion promoting element,
- and being essentially free of aluminum,
- wherein the remainder is magnesium and incidental impurities,
- wherein said magnesium alloy has a microstructure resulting from said Zn, Cu, Mn, corrosion promoting element and magnesium being melted at a temperature of at least the melting point of magnesium, mixed and resolidified, said microstructure including predominantly a first phase, said first phase including the magnesium in solid solution with the other elements, and a second phase including the corrosion promoting element and magnesium;
- wherein said magnesium alloy is adapted to degrade by microgalvanic corrosion in aqueous electrolyte.
6 more elements
A corrodible downhole article comprising a magnesium alloy, the magnesium alloy comprising:
- 1-9 wt % Zn;
- 1-2 wt % Cu;
- 0.5-1.0 wt % Mn;
- 0.1-5 wt % of a corrosion promoting element,
- and being essentially free of aluminum,
- wherein the remainder is magnesium and incidental impurities,
- with the proviso that said corrodible downhole article is not a powdered metal compact,
- wherein said magnesium alloy is adapted to corrode in freshwater so as to be removed from a borehole.
5 more elements
Dependencies are inferred from the claim text.