Abstract:
The invention provides a downhole tubular milling apparatus and method of milling a downhole tubular. The apparatus comprises a body configured to be attached to downhole conveyance equipment and at least two cutter bases connected to the body and movable between a first position in which they are substantially retracted to the body and a second position in which they are extended outwardly from the body. An operating mechanism for moving the at least two cutter bases between the first position and the second position is provided. The set of one or more blades is arranged on the at least two cutter bases and is configured for milling in an uphole direction and a downhole direction without reconfiguring the at least one set of one or more blades. In an aspect and embodiment, each of the one more blades is configured for milling in an uphole direction and a downhole direction.
Abstract:
A casing mill for downhole casing milling has multiple elongated cutter bases hingedly connected to a main body by a plurality of positioning arms. An operating mechanism within the main body of the casing mill, actuated by fluid flow, moves the cutter bases to an extended position. Multiple cutters fixed to the cutter bases are then positioned to engage a casing surface. An internal fluid operated locking mechanism can be selectively actuated to secure the cutter bases in an extended position.
Abstract:
The invention provides a cutter base for a downhole tubular milling apparatus and a removable functional cassette for the cutter base. The cutter base comprises at least one slot for receiving a removable functional cassette and a portion devoid of cutters forming a stabilising section which is configured to bear against an inner surface of a downhole tubular during a cutting and/or milling operation. The cutter base is configured to be connected to the downhole tubular milling apparatus by hinged arms and to move between a retracted condition and an extended condition with respect to the downhole tubular milling apparatus on operation of an actuating mechanism. The removable functional cassette is configured to perform one or more functions selected from a group comprising: providing stabilisation, downhole tubular cutting and/or downhole tubular milling.
Abstract:
A downhole camera assembly (100) comprises a camera having a side-view viewport (82) that can be conveyed and manipulated within a wellbore on flexible cable. Light emitted from a light source is diffused and directed by a transparent or translucent material (61) in a substantially 360-degree pattern within a wellbore, thereby illuminating portion(s) of the wellbore positioned laterally to the camera assembly in a field of view of the viewport. The viewport may be selectively rotated 360 degrees by a motor assembly (40) positioned within the camera assembly which can be controlled from the earth's surface.
Abstract:
A validation tool (100) has a central body member (10) with threaded connections at each end (12, 13), as well as a central bore (11) extending there through. At least one battery powered video camera (20) or other optical data sensor is disposed along an outer surface of the body member and can be selective activated and de-activated. Optional mirror(s) (50) are provided to permit optimum viewing of the surrounding environment, while visual images and/or other sensed data is recorded and stored on at least one data storage media. The validation tool can be used for various purposes including wellbore integrity and verification that drilling mud has been fully displaced with completion fluid in a wellbore.
Abstract:
A downhole release mechanism for a drillstring. A first, uphole section and a second, downhole section comprise longitudinal bores and are rotationally locked together via a spline. A collet assembly is connected to the first section, with collet fingers extending into the bore of the second section when the first and second sections are joined. The collet fingers are biased outwardly, and an external shoulder on the collet fingers mates with an internal shoulder in the second section, locking the sections together. A piston is slidably disposed in a bore of the collet, and spring biased uphole. Fluid flow moves the piston to a downhole position, in which the collet fingers are held outwardly and the shoulders locked together. With fluid flow stopped, the piston moves uphole, and sufficient tension on the mechanism shears shear screws and snaps the collet fingers out the internal shoulder, releasing the mechanism.
Abstract:
An assembly (100) for the illumination of a wellbore, pipeline, tank, vessel or other environment wherein light is diffused and transmitted through an optically transparent material and projected in and around a field of view of a camera lens (10). A light source is disposed within a cavity at the proximal end (102) of a cylindrical shaped, optically transparent material. Light from the source is received into the transparent material, diffused, and transmitted to the distal end of the light tube (30), where it is projected in front of and around a field of view of a camera. Control of light intensity may be variable, pre-set before operations, or fixed by component design.
Abstract:
A fluid (30) of optically clear composition is used to create a viewing window within a wellbore (1), pipelines, tanks, vessels, or any other similar environment. Selective placement of optically clear fluid facilitates acquisition of visual images and/or other data in particular areas of interest within environments containing opaque or non-transparent fluids. Such optically clear fluid can displace opaque fluids and gases, while maintaining specific viscosity, weight, and other fluid properties in order to keep opaque fluids from encroaching into a viewing area while visual data acquisition is performed.
Abstract:
A method and apparatus for efficient and effective collection of debris from a wellbore, while permitting simultaneous visual verification of such debris collection. A debris collection assembly comprises a combination of one or more of the following: a reverse circulation assembly, a video assembly and at least one filter assembly. Fluids are circulated into a wellbore annular space via the reverse circulation assembly, into the video assembly where fluid and any associated debris are visually sensed and recorded, into the filter assembly where debris is separated from the fluids and collected, before cleaned fluids are circulated out of the wellbore. The components of the debris collection assembly are substantially modular, and can be run in combination with conventional wellbore cleaning tools (such as, for example, workstring-conveyed brushes, scrapers and/or magnets).
Abstract:
An apparatus for cutting and/or milling of tubulars in a wellbore, especially using coiled tubing. An elongated main body has a longitudinal bore, with a piston slidably positioned in the bore. The piston is connected to one or more operating arms which are rotatably connected to the main body. The connection between the piston and the operating arms may be a pinned connection or a geared connection, both of which provide for a positive connection between the piston and the operating arms. Cutter bases are connected to the cutter arms, with a number of cutters mounted to the cutter bases. Fluid flow down the coiled tubing and through the main body bore pushes the piston downwardly, opening the operating arms and cutter bases and permitting the apparatus to be pulled up into the lower end of a tubular string for cutting and/or milling.