Abstract: This invention relates to a corrodible downhole article comprising an aluminium alloy, wherein the aluminium alloy comprises (a) 3-15 wt % Mg, (b) 0.01-5 wt % In, (c) 0-0.25 wt % Ga, and (d) at least 60 wt % Al. The invention also relates to a method of making a corrodible downhole article comprising an aluminium alloy, the method comprising the steps of: (a) melting aluminium, Mg, In, optionally Ga, and Ni, to form a molten aluminium alloy comprising 3-15 wt % Mg, 0.01-5 wt % In, 0-0.25 wt % Ga, and at least 60 wt % Al, (b) mixing the resulting molten aluminium alloy, (c) casting the aluminium alloy or producing an aluminium alloy powder, and (d) forming the aluminium alloy into a corrodible downhole article. In addition, the invention relates to a method of hydraulic fracturing comprising the use of the corrodible downhole article.

Abstract: A magnesium alloy suitable for use as a corrodible downhole article. The alloy has a corrosion rate of at least 50 mg/cm2/day in 15% KCl at 93° C. and a 0.2% proof strength of at least 50 MPa when tested using standard tensile test method ASTM B557-10.

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.

Abstract: A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes: (a) 2-7 wt % Gd, (b) 0-2 wt % Y, (c) 0-5.0 wt % Nd, and (d) at least 80 wt % Mg, and has an elongation as measured by ASTM B557M-10 of at least 22%.

Abstract: 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.

Abstract: A magnesium alloy is suitable for use as a corrodible downhole article, wherein the alloy includes: (a) 2-7 wt % Gd, (b) 0-2 wt % Y, (c) 0-5.0 wt % Nd, and (d) at least 80 wt % Mg, and has an elongation as measured by ASTM B557M-10 of at least 22%.

Abstract: 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.

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.

Abstract: A corrodible downhole article includes a magnesium alloy, including: a strengthening metallic element comprising at least one of Al, Zn, Mn, Cu and Ag and at least one corrosion promoting element in an amount of 0.01-10 wt % in total. The alloy has a corrosion rate of at least at least 75 mg/cm2/day in 15% KC1 at 93° C. and a 0.2% proof strength of at least 100MPa when tested using standard tensile test method ASTM B557-10. In particular, the magnesium alloy includes 5-10 wt % Al, and at least one of Zn and Mn in a total amount ranging from 0 to 1.0 wt %.

Abstract: A magnesium alloy suitable for use as a corrodible downhole article. The alloy has a corrosion rate of at least 50 mg/cm2/day in 15% KCl at 93° C. and a 0.2% proof strength of at least 50 MPa when tested using standard tensile test method ASTM B557-10.