A method of recovering casing from a wellbore in which: a logging tool is run to an estimated stuck point of the casing through the central bore of the casing spear and casing cutter; the casing spear is attached to the casing and tension applied so that logging can be performed over a length at an estimated stuck point both with and without tension to provide the verified stuck point; and the casing cutter is positioned relative to this to cut the free casing; and the spear used to remove it. The method can be performed on a single trip. Embodiments include incorporating a packer to circulate fluid during casing cutting; a disconnect, anchor mechanism and motor to allow use of a motor to operate the cutter; and a Down Hole Power Tool with a method of establishing the required force to recover a length of stuck casing.

An oil well improvement system having an intrusion detection and response subsystem that provides practical capability to defend offshore drilling platform from surface or subsurface terrorist threats/attacks utilizing modified low-cost off-the-shelf equipment and processor programs. The subsystem processes acoustical and/or RF sensor data to determine contact positions, rates, projected future positions, identification, threat analysis and recommends appropriate soft/hard kill counter measures and further provides control of those countermeasures.

A wellbore casing cutting tool having multiple expandable cutter bases. The leading or downhole ends of the cutter bases are tapered, forming a tapered nose profile, and are covered with hardened cutting material to form a cutting surface. The cutting surface on the tapered nose profile can be used to remove a cement sheath within a casing string being cut or milled.

This subsystem is an element of an oil well improvement (disasters preventive) system for offshore wells. This subsystem modifies existing in-well; data transmission equipment, data formatting & processing, and further modifies the processing of the existing sensors and remote controlled devices to provide enhanced capacity, reaction time & reliability for dynamically monitoring & controlling in-well resources. This sensor data and controlled tool status is further integrated into a single data base along with all seabed & platform devices and all related information (formation survey, drill plan, etc). The subsystem processes this data and develops instant status of operational conditions and provides recommendations/alerts/automated controls. Although the primary objective of the subsystem focuses on reducing/eliminating the disastrous effects of blowout, the subsystem also provides the means to alter/improve the normal/uneventful well drilling processes.

An offshore well-processing system includes a mobile offshore drilling unit and a remote well-processing device configured to be positioned on an offshore platform different from the mobile offshore drilling unit, the mobile offshore drilling unit defining at least one well centre and comprising at least one primary drill rig including at least one drill floor and at least one hoisting system for raising and lowering tubular equipment through the at least one well centre from/into a well in the seafloor. The mobile offshore drilling unit and the remote well-processing device are configured to be operationally coupled to each other; and the mobile offshore drilling unit is configured to assist in performing concurrent well-processing tasks on respective wells, including the first well processing task performed by the remote well-processing device on a first well and a second well-processing task concurrently performed by the offshore well-processing system on a second well.

The present invention provides a milling tool (1) for a wellbore, comprising a milling section (2) and a metal cuttings removal section (3), the milling section (2) comprises radially arranged milling elements (4); and the metal cuttings removal section (3) has a first end (5) and a second end (6) and comprises a cylinder-shaped magnetic element (7), a rotation generating device (8) and a helix-shaped longitudinal guide element (9), wherein the first end (5) is connected to the milling section; the helix-shaped longitudinal guide element (9) is arranged around the cylinder-shaped magnetic element (7); the rotation generating device (8) is operably connected to the cylinder-shaped magnetic element (7) or the helix-shaped longitudinal guide element (9); wherein the cylinder-shaped magnetic element and the helix-shaped longitudinal guide element (9) are rotatable relative to each other around a common centreline (C), and configured such that metal cuttings accumulating on the cylinder-shaped magnetic element during use is guided by the helix-shaped longitudinal guide element towards the second end (6) of the metal cuttings removal section when the rotation generating device is operated.

The present invention provides a milling tool (1) for a wellbore, comprising a milling section (2) and a metal cuttings removal section (3), the milling section (2) comprises radially arranged milling elements (4); and the metal cuttings removal section (3) has a first end (5) and a second end (6) and comprises a cylinder-shaped magnetic element (7), a rotation generating device (8) and a helix-shaped longitudinal guide element (9), wherein the first end (5) is connected to the milling section; the helix-shaped longitudinal guide element (9) is arranged around the cylinder-shaped magnetic element (7); the rotation generating device (8) is operably connected to the cylinder-shaped magnetic element (7) or the helix-shaped longitudinal guide element (9); wherein the cylinder-shaped magnetic element and the helix-shaped longitudinal guide element (9) are rotatable relative to each other around a common centreline (C), and configured such that metal cuttings accumulating on the cylinder-shaped magnetic element during use is guided by the helix-shaped longitudinal guide element towards the second end (6) of the metal cuttings removal section when the rotation generating device is operated.

A waterjet cutting tool for radial connection to a wellbore casing for cutting the wellbore casing or associated components thereof is disclosed herein. The waterjet cutting tool comprises a waterjet nozzle for outputting a cutting solution at high pressure, the waterjet nozzle for connection to a cutting solution source; a radial adjustment unit for radially associating the waterjet nozzle to the wellbore; and an annular adjustment assembly for mount of the waterjet nozzle thereto, for allowing annular movement of the waterjet nozzle about a vertical axis of the wellbore.

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 tubular stabbing guide (10) used to assist in the location of a pin end connection of a tubular in a box end connection (14) of another tubular forming the upper end of a drill string held and supported from the drill floor (16) of a rig. The stabbing guide (10) has a mounting frame (22) for location on the drill floor (16) and funnel-forming members (32) mounted on the frame (22). In use, the funnel-forming members (32) are moved from a retracted location spaced from the box end connection (14) to an active location surrounding the box end connection (14), such that the funnel-forming members (32) form a funnel for guiding the pin end connection into the box end connection (14).