Subterranean well secondary plugging tool for repair of a first plug

9) A method of repairing a first plug set within a subterranean well, comprising the steps of:

• (a) introducing into the well on a conduit a well tool, comprising;
• (1) an outer tubular housing including a first chamber section, a lower end and a series of circumferentially extending ports immediate the lower end thereof,
• (2) a lower housing selectively secured to said outer housing and including a second chamber therein;
• (3) an inner tubular housing concentrically positioned within the outer tubular housing and including a third chamber, said second and third chambers being in communication with one another;
• (4) a low temperature melting eutectic metal alloy charge deposited within said first chamber;
• (5) a thermitic reaction charge deposited within the inner tubular housing immediate and covering said ported lower end;
• (6) means secured to at least one of said housings for introducing, positioning and retrieving said plugging tool;
• (7) means for igniting the thermitic reaction charge, whereby, upon activation of the igniting means, the thermitic reaction charge is ignited sufficient to heat and thermitically melt the said low temperature melting metal alloy charge, whereby the molten eutectic metal alloy charge flows through the ported lower end of the outer housing, and into said well and upon and across said second plug;
• (8) means for introducing and retrieving the well tool into and from the well;
• (9) means for igniting the thermitic reaction charge;
• and
• (b) activating the igniting means to cause the ignition of the thermitic reaction charge in the second and third chambers, whereby during the ignition of the thermitic reaction charge, the eutectic metal alloy charge is transposed into a molten stream which discharges out of the ported lower end of the outer housing, into the well, and across and upon the first plug.

11) A secondary plugging tool for use in a subterranean well for the repair of a first plug previously introduced and set within the well, said secondary plugging tool comprising:

• (a) an outer housing;
• (b) first and second chamber sections disposed within said housing;
• (c) a low temperature melting eutectic metal alloy charge deposited within one of said chamber sections;
• (d) a thermitic reaction charge deposited within the other of the first and second chamber section;
• (e) means for permitting flow out of the outer housing of the low temperature melting eutectic metal alloy charge upon melting;
• (f) means secured to the outer housing for introducing, positioning and retrieving said plugging tool;
• and
• (g) means for igniting the thermitic reaction charge, whereby, upon burning of the thermitic reaction charge, the thermite reaction charge melts the low temperature melting eutectic metal alloy charge, whereby, upon said melting of said eutectic metal alloy charge, the molten eutectic metal alloy flows out of outer housing and into said well upon and across said plug.

12) A secondary plugging tool for use in a subterranean well for the repair of a first plug previously introduced into and set within the well, said secondary plugging tool comprising:

• (a) a tubular housing having a lower portion;
• (b) a low temperature metal alloy charge secured around the exterior of the lower portion of the tubular housing;
• and
• (c) a thermitic reaction charge disposed within the tubular housing immediate the lower portion of the housing.

13) A secondary plugging tool for use in a subterranean well for the repair of a first plug previously introduced and set within the well, said secondary plugging tool comprising:

• (a) an outer tubular housing;
• (b) inner, and outer concentrically disposed chamber sections within said housing;
• (c) a thermitic reaction charge disposed within said inner chamber section;
• (d) a low temperature eutectic metal alloy charge disposed in said outer chamber section and convertible into a molten flow upon ignition of the thermitic reaction charge;
• and
• (e) means for permitting flow of the molten eutectic metal alloy charge from within the outer chamber, into the well, and upon and across said plug.