Through tubing P and A with bismuth alloys

A method of plugging a hydrocarbon well, comprising:

• placing a wireline lubricator on top of a Christmas tree;
• deploying a casing deformation tool downhole without removing the Christmas tree to both rupture and expand an inner tubular and an exterior casing at a 1-5 m section of well to be plugged by rock-to-rock plugging wherein said rupturing tool forces blades out of the tool housing thereby expanding and rupturing the inner tubular and exterior casing giving access to the annulus surrounding the casing, thereby forming an expanded cavity;
• deploying, a blocking device downhole to block a bottom of said section of well to be plugged;
• deploying bismuth alloy pellets downhole onto said blocking device;
• heating said bismuth alloy pellets to allow said bismuth alloy pellets to liquefy;
• allowing said liquefied bismuth alloy to solidify and expand to fill said section of well to be plugged or a portion thereof;
• and
• continuing to deploy bismuth alloy pellets downhole onto said solidified bismuth alloy, heating said bismuth alloy pellets to allow said bismuth alloy pellets to liquefy, and allowing said liquified bismuth alloy to solidify and expand to fill said section of well until said 1-5 m section of well is filled with a bismuth alloy rock-to-rock plug.

A method of plugging and abandoning a hydrocarbon well, comprising:

• placing a wireline lubricator on top of a Christmas tree, deploying a casing deformation tool downhole without removing the Christmas tree to rupture and expand inner and outer tubulars at a section of well to be plugged wherein said rupturing tool forces blades out of the tool housing thereby expanding and rupturing the inner tubular and exterior casing giving access to the annulus surrounding the casing, thereby forming an expanded cavity;
• deploying a perforating tool downhole to perforate said section of well to be plugged;
• deploying a blocking device downhole to block a bottom of said section of well to be plugged;
• deploying bismuth alloy pellets downhole onto said blocking device to fill said section;
• heating said bismuth alloy pellets until said bismuth alloy pellets liquefy;
• allowing said liquefied bismuth alloy to solidify and expand to fill said section;
• deploying a cement log downhole to confirm that said bismuth alloy plug has good contact with a wall of said reservoir at said section of well to be plugged;
• removing the Christmas tree from said well;
• and
• closing and abandoning said well.