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AssigneesBeijing Huamei, Inc., China National Petroleum Corporation
InventorsTimothy Ryan DUNNE, Lei ZHAO, Jiaxiang REN, Peng CHENG, Yu LIU
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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° C. 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%.
A dissolvable magnesium composite that at least partially forms a ball, a frac ball, a tube, a plug or other tool component that is to be used in a well drilling or completion operation, said dissolvable magnesium composite includes in situ precipitate, said dissolvable magnesium composite comprising a mixture of magnesium or a magnesium alloy and an additive material, said magnesium composite includes greater than about 60 wt. % magnesium, said in situ precipitate includes said additive material, said additive material includes one or more metal materials selected from the group consisting of:
A dissolvable magnesium cast composite comprising a mixture of magnesium or a magnesium alloy and an additive material, said additive material includes one or more metals selected from the group consisting of a) copper wherein said copper constitutes at least 0.01 wt. % of said dissolvable magnesium cast composite, and b) nickel wherein said nickel constitutes at least 0.01 wt. % of said dissolvable magnesium cast composite, said magnesium composite includes in situ precipitate, said in situ precipitate includes said additive material, a plurality of particles of said in situ precipitate having a size of no more than 50 μm, said magnesium composite has a dissolution rate of at least 5 mg/cm2/hr. in 3 wt. % KCl water mixture at 90° C.
A dissolvable magnesium cast composite comprising a mixture of magnesium or a magnesium alloy and an additive material, said additive material includes a) nickel wherein said nickel constitutes 0.01-0.4 wt. % of said dissolvable magnesium cast composite, said dissolvable magnesium cast composite includes in situ precipitate, said in situ precipitate includes said additive material, said dissolvable magnesium cast composite has a dissolution rate of at least 75 mg/cm2/hr. in 3 wt. % KCl water mixture at 90° C.
Dependencies are inferred from the claim text.