Powder weld fishing tool

A system for retrieving an object from a wellbore, the system comprising:

• a fishing tool comprising:
• a main body assembly;
• a metallic protuberance positioned downhole of the main body assembly when the fishing tool is disposed in the wellbore and extending such that, when the fishing tool is lowered downhole to the object, a downhole end of the protuberance is a point of contact of the fishing tool with the object;
• one or more nozzles configured to dispose a cladding powder on the object when the object is proximate to the fishing tool;
• and
• one or more lenses disposed between the main body assembly and the protuberance and configured to direct a laser beam ring around the protuberance at the cladding powder disposed on the object, thereby melting a ring of powder to form a welded seam surrounding the protuberance to weld the protuberance to the object such that pulling the tool in an uphole direction pulls the object along with the fishing tool;
• and a conveyance connected to the fishing tool, wherein the system is configured such that, after welding the protuberance to the object, raising the fishing tool uphole, by the conveyance, pulls the object uphole along with the fishing tool.

A method for retrieving an object from a wellbore, the method comprising:

• lowering, by a conveyance assembly comprising an optical fiber, a fishing tool downhole within a wellbore, the fishing tool comprising:
• a main body assembly;
• a protuberance positioned downhole of the main body assembly when the fishing tool is disposed in the wellbore and extending such that, when the fishing tool is lowered downhole to the object, a downhole end of the protuberance is a point of contact of the fishing tool with the object;
• one or more nozzles configured to dispose a cladding powder on the object when the object is proximate to the fishing tool;
• and
• one or more lenses disposed between the main body assembly and the protuberance and configured to direct a laser beam ring around the protuberance at the cladding powder disposed on the object;
• spraying, when the tool is proximate the object, the cladding powder on the object from the one or more nozzles;
• transmitting laser light through the optical fiber to the one or more lenses, such that the lens directs a laser beam on the cladding powder, thereby melting a ring of powder to form a welded seam surrounding the protuberance to weld the protuberance to the object;
• and
• after welding the protuberance to the object, raising the fishing tool uphole by the conveyance assembly, thereby pulling the object along with the fishing tool.