Method and apparatus for sealing abandoned oil and gas wells

Details Method and apparatus for sealing abandoned oil and gas wells Method and apparatus for sealing abandoned oil and gas wells

E - Fixed Constructions

21

B

E21B 33/134 (2006.01) E21B 36/00 (2006.01)

Patent

CA 2665921

Apparatus and method for forming a solid sealing plug of bismuth-tin alloy material within a well casing for sealing oil or gas wells. Solid alloy material is positioned within a heating tool and lowered to a position within the well casing where the seal is to be formed. The heating tool is heated to liquefy the alloy material and the alloy material then runs out of the heating tool and solidifies on top of a cement plug previously formed within the well casing. A cement slurry or other fluid material may subsequently be deposited on top of the liquefied alloy material to enhance the sealing of the alloy plug, to form a barrier to subsequent creep of the alloy plug when the alloy solidifies and to counteract any pressure acting vertically on the bottom of the plug.

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