WELL TOOL AND METHOD FOR HEATING AND DEPOSITING FIRST AND SECOND CHARGES OF SELECTIVE TEMPERATURE MELTING METAL ALLOYS FOR REPAIRING FAILURE SPOTS ALONG A SECTION OF A TUBULAR CONDUIT IN A SUBTERRANEAN WELL.

摘要

A well tool and method for heating and depositing first and second charges of selective temperature melting metal alloys for repairing failure spots along a section of a tubular conduit, such as casing, in a subterranean well. A fuel charge is provided and is ignited to first melt the lower temperature melting metal alloy charge and thereafter the higher temperature metal alloy charge, such that a metal precipitate is formed from the heated higher temperature melting metal alloy charge. The housing defines a sacrificial wall which is opened or cleared as the higher temperature metal alloy charge melts, thus enabling the precipitate of the higher temperature melting alloy charge to be discharged from the housing to form a bridge for subsequent movements thereacross of the lower temperature melting alloy charge, into the well immediate the area of the failure spots. The failure spots are filled and/or covered by the precipitate and the lower temperature metal alloy charge to enhance the integrity of the tubular conduit such that production or other efforts may be continued within the well.