| 摘要 |
Method for forming a downhole plug within an abandoned well casing for preventing the flow of gas through the plug and reaching the surface, particularly for CO2 sequestration projects. A milling tool mills out a longitudinal section of the perimeter of the well casing and surrounding cement and detritus to expose the well bore. A heater containing solid metallic alloy is lowered into the casing and the alloy is melted so that it fills the milled out area and flows into the face of the well bore. The heater is removed to allow the alloy to solidify. The upper casing acts to restrain any movement of the plug following solidification of the alloy.
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