Patent ID: 7290609

Claim:
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) an outer tubular housing including a first chamber section, a lower end and a series of circumferentially extending ports immediate the lower end thereof; (b) a lower housing selectively secured to said outer housing and including a second chamber therein; (c) 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; (d) a low temperature melting eutectic metal alloy charge deposited within said first chamber; (e) a thermitic reaction charge deposited within the inner tubular housing immediate and covering said ported lower end; (f) means secured to at least one of said housings for introducing, positioning and retrieving said plugging tool; and (g) 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 first plug.