Patent ID: 7249630
Filing Date: 2007-07-31
Classification: E21B

Abstract:
1. A well tool for heating a first lower temperature melting eutectic metal alloy charge and a second higher temperature metal alloy charge and for providing from the heated second higher temperature metal alloy charge a metal precipitate for deposition with the first lower temperature melting eutectic metal alloy charge in the well for the repair of failure spots along a section of a tubular conduit, comprising: (a) an elongated housing having a cylindrical interior chamber and a lower end, said chamber being formed by first and second sections thereof, said housing having proximate its lower end a circumferentially extending dissolvable sacrificial wall means for initially isolating the chambers from the exterior of the housing and, upon melting of the metal alloys, providing a passageway through said housing to permit the metal precipitate to flow out of the housing and into the well; (b) the first, lower temperature melting eutectic metal alloy charge deposited within one of the first and second sections of the chamber; (c) the second, higher temperature melting metal alloy charge deposited within the other of the first and second sections of the chamber; (d) means at one end of said housing for introducing, positioning and retrieving said tool within said well; (e) an ignitable fuel system within said chamber; (f) means for igniting the fuel system, whereby, upon activation of the ignitable fuel system, the fuel system is ignited sufficient to heat and melt the first lower temperature melting eutectic metal alloy charge and thereafter sufficient to heat and melt the second higher temperature melting metal alloy charge, whereby, upon said melting of said alloy charges, the sacrificial wall is dissolved to provide said passageway for the flow of the first eutectic metal alloy charge and the metal precipitate through the housing and into the well.