Magnesium Elektron, Inc.

Mark Turski

Timothy E Wilks

Matthew Murphy

A magnesium alloy suitable for use as a corrodible downhole article. The alloy has a corrosion rate of at least 50 mg/cm/day in 15% KCl at 93&#xb0; C. and a 0.2% proof strength of at least 50 MPa when tested using standard tensile test method ASTM B557-10.

Corrodible downhole article

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.

A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes:

A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes: (a) 11-15 wt % Y, (b) 0.5-5 wt % in total of rare earth metals other than Y, (c) 0-1 wt % Zr, (d) 0.1-5 wt % Ni, and (e) at least 70 wt % Mg. It has been surprisingly found by the inventors that by increasing the Y content of the alloy to the range specified above, increased age hardening response and hence increased 0.2% proof stress can be achieved.

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Manchester, United Kingdom

Mark Turski