An overshot for removing a fish from a wellbore includes a first catch that attaches to a fishing assembly and one or more additional catches that connect, in sequence, to the first catch. Each catch of the one or more additional catches includes a different internal diameter from other catches of the one or more additional catches. The one or more additional catches are connected, in order, according to their respective internal diameters. The overshot attaches to a top of the fish.

An overshot for removing a fish from a wellbore includes a first catch that attaches to a fishing assembly and one or more additional catches that connect, in sequence, to the first catch. Each catch of the one or more additional catches includes a different internal diameter from other catches of the one or more additional catches. The one or more additional catches are connected, in order, according to their respective internal diameters. The overshot attaches to a top of the fish.

Elongate capsules for housing waste are configured for disposal (placement) into wellbore(s) that are located in particular deep underground geologic formation(s). These capsules have opposing structures for physically linking multiple capsules together in an end-to-end fashion. These opposing end structures may include a stinger with pins at a top end of the capsule; and a J-slots structure at the bottom end of the capsule. The stinger with pins of a first capsule may be (removably) attached to the J-slots of a second capsule. Further, a retrieval-tool also has the J-slots structure at one end. The J-slots structure of the retrieval-tool may be configured to (removably) attach to a stinger with pins of a given capsule (which may be linked to other capsule(s)); and then the retrieval-tool may be used to retrieve the given capsule(s) from a given wellbore. Capsule retrieval systems and/or method may utilize such capsule(s) and the retrieval-tool.

A downhole retrieval tool includes: an upper sub-assembly disposed at a proximal end of the retrieval tool; an engagement body disposed axially adjacent to the upper sub-assembly, with respect to a central longitudinal axis of the retrieval tool; and a milling tool disposed at a distal end of the retrieval tool. The engagement body is configured to selectively constrict about a portion of production tubing extending from a packer assembly, the packer assembly comprising a packer element. The milling tool is configured to mill one or more portions at an outer periphery of the packer element. A related method includes deploying and utilizing such a retrieval tool downhole.

A borehole fishing tool, including a grapple for fixedly attaching to a fish in a borehole, a tool housing to which the grapple is connected, and at least one camera, mounted in the tool housing, to generate at least one image of the fish in the borehole. The borehole fishing tool also includes at least one light source, mounted in the tool housing, to illuminating a portion of the borehole between the at least one camera and the fish, a connector attached to the tool housing to connect the tool housing to a conveyor, and a telemetry transceiver to transmit at least one image of the fish through a telemetry channel in the conveyor to a computer system at an Earth's surface.

An overshot apparatus includes a tubular housing and a grapple disposed within a bore of the tubular housing. The grapple has a central opening to receive a fish and is operable to grip an outer diameter of the fish. A stinger is supported in the bore by an adapter attached to an upper end of the tubular housing. The stinger is positioned to be inserted into the fish received in the central opening of the grapple. A packing element is positioned on an external surface of the stinger to engage an inner diameter of the fish when the stinger is inserted into the fish and the fish is received within the central opening of the grapple. The adapter and stinger have conduits for passage of fluid into the fish.

An overshot apparatus includes a tubular housing and a grapple disposed within a bore of the tubular housing. The grapple has a central opening to receive a fish and is operable to grip an outer diameter of the fish. A stinger is supported in the bore by an adapter attached to an upper end of the tubular housing. The stinger is positioned to be inserted into the fish received in the central opening of the grapple. A packing element is positioned on an external surface of the stinger to engage an inner diameter of the fish when the stinger is inserted into the fish and the fish is received within the central opening of the grapple. The adapter and stinger have conduits for passage of fluid into the fish.

A well column pipe retrieval tool incorporating a “U” bracket having a lateral arm and an oppositely lateral arm, wherein the oppositely lateral arm has a fixed segment and a moveable segment; the column pipe retrieval tool further incorporating a column pipe receiving throat which is laterally bounded by the “U” bracket's lateral arm, and which is oppositely laterally bounded by the oppositely lateral arms' moveable segment; the column pipe retrieval tool further incorporating a plurality of pin and angled slide slot combinations which interconnect the oppositely lateral arm's fixed and moveable segments.

A borehole fishing tool, including a grapple for fixedly attaching to a fish in a borehole, a tool housing to which the grapple is connected, and at least one camera, mounted in the tool housing, to generate at least one image of the fish in the borehole. The borehole fishing tool also includes at least one light source, mounted in the tool housing, to illuminating a portion of the borehole between the at least one camera and the fish, a connector attached to the tool housing to connect the tool housing to a conveyor, and a telemetry transceiver to transmit at least one image of the fish through a telemetry channel in the conveyor to a computer system at an Earth's surface.

A method of freeing a stuck pipe in a wellbore includes positioning a pipe freeing tool within an annulus of the stuck pipe, the pipe freeing tool including a body and two or more arms coupled to and extending from the body, and activating the two or more arms of the pipe freeing tool to extend outwards from the body to apply a force to the stuck pipe. Another method of freeing a stuck pipe in a wellbore includes determining a stuck point along a drillstring comprising the stuck pipe, and activating a pipe freeing tool coupled to the stuck pipe to apply a force to the stuck pipe, wherein the force moves the stuck pipe away from a surface of the wellbore and towards a center of the wellbore, and the pipe freeing tool includes a plurality of expandable disc elements.