Method and apparatus for removing a downhole casing from a well on a single trip. A downhole tool assembly is arranged on a work string having a downhole pull tool, a spear tool, motor unit and cutting device. The downhole pull tool is set inside a first casing string and the spear tool, motor unit and cutting device are located inside a second casing string, located through the first casing string. The downhole pull tool and spear tool can be configured to grip the respective casings during cutting of the second casing string. The cut casing section can then be pulled using the downhole pull tool to dislodge the casing section, whereupon via attachment to the spear tool, the cut casing section can be removed from the well. The assembly can be re-set at shallower depths in the event that the cut casing section cannot be dislodged for removal.

A thermal cutter device for cutting downhole objects in a reservoir wellbore, wherein the device lacks moving parts, and thus is more robust and less failure prone than prior art thermal cutter.

Method and apparatus for removing a downhole casing from a well on a single trip. A downhole tool assembly is arranged on a work string having a downhole pull tool, a spear tool, motor unit and cutting device. The downhole pull tool is set inside a first casing string and the spear tool, motor unit and cutting device are located inside a second casing string, located through the first casing string. The downhole pull tool and spear tool can be configures to grip the respective casings during cutting of the second casing string. The cut casing section can then be pulled using the downhole pull tool to dislodge the casing section, whereupon via attachment to the spear tool, the cut casing section can be removed from the well. The assembly can be re-set at shallower depths in the event that the cut casing section cannot be dislodged for removal.

Method and apparatus for removing a downhole casing from a well on a single trip. A downhole tool assembly is arranged on a work string having a downhole pull tool, a spear tool, motor unit and cutting device. The downhole pull tool is set inside a first casing string and the spear tool, motor unit and cutting device are located inside a second casing string, located through the first casing string. The downhole pull tool and spear tool can be configures to grip the respective casings during cutting of the second casing string. The cut casing section can then be pulled using the downhole pull tool to dislodge the casing section, whereupon via attachment to the spear tool, the cut casing section can be removed from the well. The assembly can be re-set at shallower depths in the event that the cut casing section cannot be dislodged for removal.

The invention provides a downhole tool for cutting a wellbore casing. The downhole tool comprises a gripping mechanism for gripping a section of wellbore casing and a cutting mechanism configured to cut the casing. The grip mechanism is configured to grip a range of casing diameters.

The invention provides a downhole tool for cutting a wellbore casing. The downhole tool comprises a gripping mechanism for gripping a section of wellbore casing and a cutting mechanism configured to cut the casing. The grip mechanism is configured to grip a range of casing diameters.

A central shaft defines a first interior flow path. The central shaft disposed at least partially within a washover pipe. A lead tapered mill is positioned at a downhole end of the central shaft to center the downhole-type milling tool within a tubular. The lead tapered mill defines a second central flow path in line with the first interior flow path. Milling blades extend between the central shaft and the washover pipe. The milling blades are arranged to allow fluid flow around the milling blades. Each of the milling blades includes a tungsten-carbide hardened face and a soft steel body configured to support a load of the downhole-type milling tool during milling operations. A junk basket is positioned within the washover pipe uphole of the milling blades to receive and retain cuttings formed by the milling blades.

A central shaft defines a first interior flow path. The central shaft disposed at least partially within a washover pipe. A lead tapered mill is positioned at a downhole end of the central shaft to center the downhole-type milling tool within a tubular. The lead tapered mill defines a second central flow path in line with the first interior flow path. Milling blades extend between the central shaft and the washover pipe. The milling blades are arranged to allow fluid flow around the milling blades. Each of the milling blades includes a tungsten-carbide hardened face and a soft steel body configured to support a load of the downhole-type milling tool during milling operations. A junk basket is positioned within the washover pipe uphole of the milling blades to receive and retain cuttings formed by the milling blades.

Systems and methods for removing casing from a wellbore including a casing removal tool that includes a tubular body configured to contain a thermite fuel mixture configured to initiate into a molten thermite fuel. The casing removal tool also includes a nozzle array having a plurality of nozzles positioned on an external surface of the tubular body. The nozzle array is configured to impinge the molten thermite fuel from within the tubular onto the wellbore casing. The casing removal tool also includes an orientation lug configured to anchor into a downhole orientation tool.

Systems and methods for removing casing from a wellbore including a casing removal tool that includes a tubular body configured to contain a thermite fuel mixture configured to initiate into a molten thermite fuel. The casing removal tool also includes a nozzle array having a plurality of nozzles positioned on an external surface of the tubular body. The nozzle array is configured to impinge the molten thermite fuel from within the tubular onto the wellbore casing. The casing removal tool also includes an orientation lug configured to anchor into a downhole orientation tool.