A downhole fishing tool for retrieving an object from a wellbore includes a main body assembly configured to be positioned in the wellbore, a cladding material disposed on an edge of a downhole end of the main body, and a lens configured to direct a laser beam along the cladding material when the cladding material is in contact with the object, thereby welding the fishing tool to the object such that, when welded, pulling the tool in an uphole direction pulls the object along with the fishing tool.

An apparatus and method for retrieving metal objects from wellbores are provided. An exemplary apparatus includes a fishing tool that has a metal welding surface. The apparatus also includes an electrode coupled to the metal welding surface and a power source. An exemplary method includes lowering a weld-based fishing tool into a wellbore of a well. The method includes initiating a welding to bond a weld-based fishing tool with a fish. The method includes raising the weld-based fishing tool from the wellbore to retrieve the fish.

A downhole fishing tool for retrieving an object from a wellbore includes a main body assembly, one or more nozzles configured to dispose a cladding powder on the object when the object is proximate to the tool, and one or more lenses configured to direct a laser beam at the cladding powder disposed on the object, thereby welding the fishing tool to the object such that pulling the tool in an uphole direction pulls the object along with the fishing tool.

A wellbore debris removal apparatus comprises a crossover sub having a first sub end and a second sub end, wherein the crossover sub includes at least one slotted mechanism and includes a fluid passageway extending from the first sub end to the second sub end. The wellbore debris removal apparatus comprises a debris removal tube having at least one lug and a tube end to be placed in the crossover sub such that the debris removal tube is engaged with the at least one slotted mechanism of the crossover sub via the at least one lug.

A method of removing a fish from a wellbore comprises attaching a fishing tool to a distal end of a conveyor, the fishing tool comprising a housing and a self-solidifying material disposed within a cavity of the housing and configured to transition from a relatively soft state to a relatively hard state; inserting the fishing tool attached to the conveyor into the wellbore; lowering the fishing tool over the fish in the wellbore to immerse at least a portion of the fish within the self-solidifying material; allowing the self-solidifying material to transition from the relatively soft state to the relatively hard state, thereby securing the fish to the fishing tool; and retracting the fishing tool attached to the conveyor from the wellbore to remove the fish from the wellbore.

A method of removing a fish from a wellbore comprises attaching a fishing tool to a distal end of a conveyor, the fishing tool comprising a housing and a self-solidifying material disposed within a cavity of the housing and configured to transition from a relatively soft state to a relatively hard state; inserting the fishing tool attached to the conveyor into the wellbore; lowering the fishing tool over the fish in the wellbore to immerse at least a portion of the fish within the self-solidifying material; allowing the self-solidifying material to transition from the relatively soft state to the relatively hard state, thereby securing the fish to the fishing tool; and retracting the fishing tool attached to the conveyor from the wellbore to remove the fish from the wellbore.

An expandable polymer grout system comprises an isocyanate component and an organic polyol component that when combined form a grout for bonding to equipment used in a wellbore. In a first instance, the grout is used with a retrieval system to bond to an obstruction in a wellbore for retrieving the obstruction from the wellbore. In a second instance, the grout is used with a deployment system to secure a sensor to downhole equipment within a wellbore. In a third instance, the grout is used to secure a casing centralizer to an outer surface of a casing before the casing is placed in a wellbore. In a fourth instance, the grout is molded to form a casing centralizer on an outer surface of a casing before the casing is placed in a wellbore.