Abstract: During extension, the reamer block of an expandable reamer pushes on an upper plate. Extension is limited by contact with a spring retainer. To adjust the maximum extension of the expandable reamer, a spacer is placed between the expandable block and the spring retainer. The spacer reduces the amount of longitudinal travel of the expandable reamer, thereby reducing the extension of the expandable reamer.

Abstract: A controllable downhole scraper includes a fluid reservoir having a pressure wall positioned and movable within the fluid reservoir defining a first portion of the fluid reservoir including a first fluid. The pressure wall exerts a force on the first fluid to maintain a first pressure. A scraper blade is movable between a retracted and an extended position. A sleeve is positioned on a tubular and slidable between a first position engaging the scraper blade to move into the retracted position, and a second position engaging the scraper blade to move into the extended position. The sleeve is configured to move between the two positions through a reduction in the first pressure in the first fluid. A restrictor is fluidly coupled between the fluid reservoir and a pressure reservoir. A gas reservoir, fluidly coupled to the first fluid, is selectively operable to reduce the first pressure in the first fluid.

Abstract: A method of positioning a bottom hole assembly in a wellbore includes lowering the bottom hole assembly into the wellbore. The bottom hole assembly has a whipstock, a downhole tool, and a cleaning tool having a cleaning element. The method also includes cleaning at least a portion of a wall of the wellbore using the cleaning tool, and activating the downhole tool to engage the cleaned portion of the wall.

Abstract: A system to clean well casing in a downhole well operation. The system comprises an inner collar having flow ports and an out collar having jet ports in fluid communication with the flow ports. The inner collar couples with a section of a tool string and the outer collar rotates about the inner collar in response to fluid flow through the tool string. The inner collar can include a sleeve. The sleeve can be moved from a first position to a second position causing the jet ports to be in fluid communication with the flow ports. The inner collar remains relatively stationary with respect to the rotation of the outer collar. In addition, the jet ports are angled in a way that a portion of force generated by the fluid flow through the jet ports induce rotation of the outer collar in the opposite direction of the fluid flow.

Abstract: A well case brushing and surge blocking apparatus includes a housing, a frame, an actuating arm, a gear assembly, a hydraulic motor, a hydraulic speed controller, and a hydraulic counterbalance. The housing is laterally connected to the frame. The gear assembly is laterally mounted to the frame and positioned opposite of the housing. The actuating arm is positioned within the housing as a stator of the hydraulic motor is externally mounted to the gear assembly, and a rotor of the hydraulic motor and the actuating arm is torsionally coupled with each other through the gear assembly. The hydraulic speed controller and the hydraulic counterbalance are mounted to the frame. The hydraulic motor is in fluid communication with the hydraulic speed controller and the hydraulic counterbalance so that a sand line of rig can be looped and operated through the well case brushing and surge blocking apparatus.

Abstract: Aspects of the present disclosure relate to a downhole tool having a plurality of turbulence-generating channels. Other aspects of the disclosure relate to downhole tools having one or more ports. Embodiments further include methods for connecting the downhole tool to a wireline system and performing a pump-down operation where the plurality of turbulence-generating channels of the downhole tool create turbulence in fluid being pumped around the downhole tool, creating a force on the downhole tool in a downhole direction. Embodiments further include methods where a component moving in the cavity of the downhole tool unseals the opening at the downhole end of the substantially cylindrical body; and pulling the downhole tool in an uphole direction in the wellbore, wherein fluid in the wellbore passes through the port, into the cavity, and out of the opening on the downhole end of the downhole tool.

Abstract: The present invention relates to a magnetic cleaning tool (100) for removing ferrous debris from within a BOP, riser or wellbore, the tool comprising: a tool body having a longitudinal axis, and one or more magnets (104) configured to rotate around an axis substantially parallel to the longitudinal axis from a first position to a second position. In the first position the one or more magnets attract ferrous debris to a debris gathering surface, and in the second position the one or more magnets do not attract ferrous debris to the debris gathering surface.

Abstract: A covering for a rig structure has plural segments separably connected together to form a loop to enclose a portion of a rig structure. Segments can be added or removed to adjust the size of the covering. A lower edge of the covering is connected around a containment basin suspended from the rig structure to contain fluids captured by the covering. An upper edge of the covering is connected to an adjustable frame suspended from the rig structure. The frame can be raised after the covering is attached to it to tauten the covering.

Abstract: The present invention relates to a method and apparatus for cleaning an oil and gas well riser section or assembly on location offshore that includes a larger diameter central pipe and a plurality of smaller diameter pipes that are spaced radially away from the central larger diameter pipe. Even more particularly, the present invention relates to an improved method and apparatus for cleaning oil and gas well riser sections wherein a specially configured cap or pair of caps are fitted to the ends of the riser which enable pressure washing cleaning tools (or a camera) to be inserted into and through a selected one of the pipes including either a smaller diameter of the pipes or the central larger diameter pipe and wherein the cap continuously collects spent cleaning fluid and debris, allowing the cleaning process to be done on location without transporting the riser section back onshore.

Abstract: A rod centralizer and solids control assembly can be mounted on a rod string. The assembly allows well fluid containing high solids to pass through the pump while eliminating the solids from being swept back into the pump barrel or accumulating in the tubing. The assembly can include a body portion coupled to a bristle positioned helically around the body portion. The bristle can be coupled to a piston, allowing the bristle to extend during upward fluid movement and retract when rod rotation stops. The bristle can trap solids, leaving the solids higher and away from a pump intake. This can allow the solids to be lifted out of the pump, preventing solids from collecting on a bottom portion of the pump or tubing. The assembly can include centralizer components that center the rod, preventing it from rubbing against the tubing. Multiple assemblies can be incorporated into the rod string.

Abstract: A pipe cleaning tool has a longitudinally extending hollow shaft with a honer head on the forward end and stabilizing legs behind the honer head. The shaft is adapted to be connected to a machine for pulling the tool through the pipe while rotating the tool such that the cutting elements on the reamer head remove debris from the inside wall of the pipe. The legs center and stabilize the reamer head to prevent contact with the internal pipe wall during the cleaning operation. Water or other lubricating fluid is ejected from the shaft during use of the tool to lubricate the tool in the pipe, and to flush loose debris out of the path of the tool.

Abstract: A tubular has a retracted configuration and an extended configuration. The tubular is initially in the retracted configuration and run into a bore at least partially lined with filter cake. The tubular is extended such that a filter cake-disrupting member mounted on the tubular defines high points or otherwise has an outer surface of varying radial extent for disrupting or disturbing the filter cake.

Abstract: A downhole milling tool (100) operable to remove unwanted debris from an interior wall of a pipeline, well casing or other tubular in which the tool (100) is deployable. The tool (100) comprises a hollow tool body (1, 11) mountable on a drill string and an annular element (8) mountable about an outside surface of the tool body (1). The annular element (8) houses at least one elongate milling blade (12). The at least one milling blade (12) is configured such that it always projects from an outside surface of the annular element (8) and includes an elongate cutting face (36). The annular element (8) is configured to be rotatably coupled to the tool body (1) in an active state and rotatably decoupled from the tool body (1) in an inactive state such that the annular element (8) and the tool body (1) are rotationally dependent when coupled and rotationally independent when decoupled.

Abstract: In accordance with embodiments of the present disclosure, a centralizer for aligning a tubular in a wellbore includes a stepped centralizer feature. The stepped centralizer feature includes a composite material with a stepped profile. That is, the stepped centralizer feature includes a first layer of the composite material having a convex rounded side for interfacing with the tubular, and a second layer of the composite material extending from the first layer. The first layer is wider than the second layer. The stepped centralizer feature may be a centralizer blade bonded to an outer surface of the tubular, or a stop collar used to hold a centralizer spring in place on the tubular. The stepped centralizer feature helps to distribute stress through the centralizer feature so that the centralizer feature does not crack or de-bond from the tubular in low temperature, high pressure environments.

Abstract: A drilling assembly is tripped in a cased hole to make more open hole. The assembly features retracted scrapers and a closed circulation sub so that the drilling can commence with string pressure delivered to bit nozzles due to the circulation sub being in a closed position. When drilling is done and the bit is to be removed, an object lands on a seat on a sleeve that acts as a piston to break scraper retainers for casing scraping deployment and to open the circulation port. A bypass opens around the seated ball when the sleeve shifts to allow flow around the seated ball for circulation while scraping. Drilling and casing scraping are accomplished in a single trip.

Abstract: A downhole tool in a wellbore may be at least partially enclosed by a protector. The protector may form a physical barrier between the downhole tool and a wellbore environment. The protector include a sheath formed of a pliant material or a textile and may include one or more hard inserts.

Abstract: An instrument for the mechanical removal of corrosive buildup, deposits or scale from within a wellbore. A tubing-conveyed scraping blade and/or other abrading devices (50) has a collapsible maximum outer diameter by using a multi-bar mechanism (53, 54) to ensure physical contact with corrosive buildup, deposits or scale on surfaces of a surrounding wellbore, oil and gas tubular, or drilling/production marine riser (and, in particular, inner surfaces thereof). The multi-bar mechanism allows for a wide range of motion irrespective of the direction of loading and variable maximum outer diameter to clean corrosive buildup, deposits or scale from tubular goods with unknown configurations and/or dimensions.

Abstract: The present invention relates to a downhole cleaning tool for removing residues or precipitation solids on an inner face of a casing or liner. The downhole cleaning tool comprises a tool body having a bore and a wall, at least one inlet in the wall of the tool body, said inlet being fluidly connected with the bore, a solid removing element connected with the tool body for releasing solids of the inner face of the casing or liner, and a fluid cleaner section comprising a chamber, a filter within the chamber for separation of the solids from the fluid and a pump fluidly connected with the bore for sucking fluid with released solids in through the inlet into the chamber, wherein the solid removing element comprises at least one projecting part projecting from the tool body and a spring arranged between the tool body and the projecting part, and wherein the at least one inlet may be arranged adjacent the projecting parts for suction of released solids.

Abstract: An expandable tool includes a body and a recess extending at least partially through the body from an outer radial surface of the body. A spline insert may be at least partially positioned in the recess and coupled to the body. The spline insert may include a single spline or multiple splines. A cutter block or other expandable member may be at least partially positioned in the recess. The cutter block or other expandable member may include a spline on a side surface thereof, which spline may be engaged with the one or more splines of the spline insert. Engagement between one or more splines of the spline insert and spline of the cutter block or other expandable member may allow the expandable member to move radially outward from a retracted position to an expanded position, and vice versa.

Abstract: An apparatus for, and method of, centering downhole well tools within the wellbore of a pipe comprises at least a pair of discs secured, respectively, to the distal end of a tool in a plane normal to a longitudinal tool axis, with an arc of each disc extended past the outer perimeter of the tool to at least an internal perimeter of an applied pipe bore and flexing to centralize the tool. In alternative embodiments, the discs are replaced by blades that are secured by a plurality of attachment points and fasteners, or by spring steel wires that are secured in radial apertures through an end boss by interference fit, soldering, swaging, or gluing.

Abstract: An apparatus and method, usable for centering downhole well tools within a pipe or wellbore, comprises a cylindrical end boss extension, from a distal end of a well tool housing, and a thin ring secured about said end boss comprising a plurality of radial apertures. Thin metallic wires, having distal ends secured within said apertures, extend radially from said ring into contact with the inside wall(s) of the pipe or wellbore. An alternative embodiment includes an annular extension from the distal end of said well tool that encloses a cavity within. A plurality of diametrically opposite apertures in said annular extension receives respective wires across a tool housing axis to project in opposite directions into contact with said inside wall of the pipe or wellbore. Said wires may be secured to said well tool by a potting compound, including a high temperature silica compound, an adhesive paste, or other compounds.

Abstract: A drilling assembly is tripped in a cased hole to make more open hole. The assembly features retracted scrapers and a closed circulation sub so that the drilling can commence with string pressure delivered to bit nozzles due to the circulation sub being in a closed position. When drilling is done and the bit is to be removed, an object lands on a seat on a sleeve that acts as a piston to break scraper retainers for casing scraping deployment and to open the circulation port. A bypass opens around the seated ball when the sleeve shifts to allow flow around the seated ball for circulation while scraping. Drilling and casing scraping are accomplished in a single trip.

Abstract: A tool for cleaning a casing tubular (13??) via a narrower casing tubular (9??) or width restriction, has an elongate tool body 1 with axial throughbore 2, box 3 for a corresponding pin 4 to form a tool joint with a workstring 5. In FIG. 1, the body has a nose 6 with fluid discharge channel 7 to pass circulation fluid. An internal shoulder provides a valve seat 8 for a ball 9 passed through the workstring under gravity or during pumping of fluid. Transverse channels 10 receive fluid diverted when the ball is seated within the tool. A side surface 21 has fluid outlet ports 11, and at least one further working surface 22 has tool elements, e.g. bristle-type cleaning elements 23, or scrapers or wipers. Thus the tool body is asymmetrical offering jetting functionality on one side of the tool and mechanical cleaning on the other side.

Abstract: An annulus spacer for a fuel channel assembly of a nuclear reactor, and method of manufacturing an annulus spacer. The fuel channel assembly includes a calandria tube and a pressure tube positioned at least partially within the calandria tube. The annulus spacer includes a garter spring configured to surround a portion of the pressure tube to maintain a gap between the calandria tube and the pressure tube. A girdle wire is positioned substantially within the garter spring and configured to form a loop around the pressure tube. The girdle wire includes a first segment and a second segment that overlaps the first segment to form an overlap, the overlap extending between approximately 45 degrees and approximately 135 degrees to reduce the possibility of girdle wire twisting.

Abstract: A completion system comprises tubular components coupled together to form a completion string. In-flow control devices are provided to permit selective fluid communication between an internal bore of the completion string and the annulus. A reaming tool is provided at a leading end of the completion string and the reaming tool is run into the borehole with the completion string. The reaming tool comprises a fluid-powered drive unit, a reaming body and a reaming nose. In use, the completion string is located in the borehole and fluid is directed to the reaming tool to facilitate reaming of the borehole. A second tubular in the form of a washpipe may extend through an internal bore of the completion string for providing fluid to the reaming tool. The reaming tool is operable at a fluid pressure below a pressure which would activate the in-flow control devices.

Abstract: An apparatus and method for substantially sealing an opening defined by a hydrocarbon well downhole component, wherein an interior portion of the downhole component is in fluid communication with a formation surrounding the hydrocarbon well. The apparatus includes a deformable plug adaptable to being injected into the wellbore upstream of the opening and carried through the wellbore in a fluid. The fluid carrying the deformable plug can flow through the opening and the deformable plug is sized and configured such that at least a portion of the deformable plug can deform to the contour of the opening and seat in the opening. The deformable plug is capable of swelling, hardening, or compressing such that the deformable plug forms a substantially sealed relationship with the hydrocarbon well downhole component such that the interior portion of the downhole component ceases to be in fluid communication with the formation surrounding the well.

Abstract: A torque resistant casing scraper for attachment to a drillstring is comprised of a one piece tool body having rotationally unrestrained two-piece blade carriers with hardened diamond-shaped cutting blades and rotationally unrestrained two-piece axial centralizers. Adjoining blade carriers and centralizers rotate independently of the drillstring and the blade carriers interlocked to prevent relative rotation between the blade carriers and to index, or orient the cutting blades as desired along the longitudinal axis of the casing scraper. The diamond-shaped cutting blades and the indexed blade carriers allow both right-handed and left-handed drillstring rotation without reducing utility or effectiveness of the scraper. The casing scraper is particularly effective for deep, near-horizontal wellbores.

Abstract: The present invention relates to a downhole tool (1) for borehole cleaning or for moving fluid in a borehole. The tool comprises a tool housing (29), a chamber inlet (6) and a chamber outlet (36), and the tool housing comprises a pump (8) arranged in a pump housing (4) and a driving unit powered by an electrical conducting means for driving the pump.

Abstract: An apparatus to alter the flow of a fluid (e.g., drilling fluid, mud, cement, etc.) in a wellbore by creating turbulence in the flowing fluid. The apparatus includes a plurality of blade members extending outward from an elongated member. The elongated member is attached to the exterior surface of a tubular that is then positioned in a wellbore.

Abstract: Systems and method for improving down hole operations of well casings are disclosed herein. Systems and methods disclosed herein can comprise brushes, high pressure fluid outlets, and skids. Other systems and methods are disclosed herein.

Abstract: The rod guide and solids control assembly can be mounted on a rod string. The assembly can allow well fluid that contains high solids to pass through the pump under normal operation while eliminating the solids from being swept back into the pump barrel. The assembly can include a body portion coupled to a bristle that extends helically around the body portion. The body portion can be placed on a pump valve rod or hollow valve rod. On an upstroke, the bristles can be locked into place for trapping and lifting the solids. On a downstroke, the bristles can be rotated for leaving the solids higher and away from a pump intake. This can allow the solids to be lifted out of the pump and thereby prevent solids from collecting on a bottom portion of the pump. Multiple assemblies can be incorporated into the sucker rod string.

Abstract: Milling tools, systems, and assemblies may have an adjustable gauge diameter. An example mill may include a body with tracks thereon. The tracks may slope in an axial direction and may be configured to couple to multiple blades. A locking collar may be positioned on the body and may be movable between multiple locking positions. Each locking position may be axially offset from another. At each locking position, the blades may be located at a different axial position on the body. Where the tracks slope, each different axial positions of the blades may also correspond to a different radial position for the blades. A gauge diameter of the blades may be based on the locking positions of the locking collar.

Abstract: A well cleanout tool configured to replace a joint of tubing in a multi-joint tubing string for a wellbore. The well cleanout tool having a bushing threadable to a tubular and a one piece integral nozzle threaded to the tubular opposite the bushing, with an inner gas separator assembly contained within the tubular for flowing particulate out the nozzle end and cleaned wellbore fluid out the bushing end.

Abstract: A method of drilling and cleaning a wellbore while rotating the drill string after full drilling depth is reached without running the drill string out the bore to install a clean up work string is disclosed wherein a drill string having a drill bit at one end includes at least one near bit selectively activatable cleaning tool (10, 11, 12) mounted within the length of the drill string, said cleaning tool having a cleaning member (18) adapted to be moved from a close fitting stowed configuration within a recess (17) to a deployed configuration upon a body of the tool, wherein the cleaning member has magnets (19, 43) for use in positioning thereof, and compact tools for scraping, milling and brushing with improved resistance to ingress of detritus, debris and formation particulates are disclosed.

Abstract: A torque resistant casing scraper for attachment to a drillstring is comprised of a one piece tool body having rotationally unrestrained two-piece blade carriers with hardened diamond-shaped cutting blades and rotationally unrestrained two-piece axial centralizers. Adjoining blade carriers and centralizers rotate independently of the drillstring and the blade carriers interlocked to prevent relative rotation between the blade carriers and to index, or orient the cutting blades as desired along the longitudinal axis of the casing scraper. The diamond-shaped cutting blades and the indexed blade carriers allow both right-handed and left-handed drillstring rotation without reducing utility or effectiveness of the scraper. The casing scraper is particularly effective for deep, near-horizontal wellbores.

Abstract: A space filler material is used to prevent accumulation of debris that could later foul the operation of adjacent moving parts. In one application a void space that is subsequently closed by actuated parts is initially filled with a material that is highly compressible and has voids that allow it to compress without undue resistance to part movement when the void volume is reduced. Ideally, the pores or voids in the material itself are small enough to keep most if not all the debris from entering and making the space filling material too rigid to collapse under part movement. In an alternative application, the material can be in an annular space such as a seal bore and it can keep debris from getting past the seal bore while allowing hydrostatic pressure across itself thereby helping it to maintain its position until moved such as by shifting of an inner string to which it is attached.

Abstract: A downhole cleaning tool for cleaning a casing is provided with a diverter cup assembly (102) including a housing (126) and a resilient swab cup (105) slidably mounted on a tubular body (120) with an increased external diameter portion 128 defining at either end upper and lower limit stops (130, 132), and sized to make provision for a gap (136) which allows a sliding movement of the swab cup such that only one of limit stops (130, 132) engages to always pull the swab cup via optional bearings (134) at each extremity of the sliding travel according to whether the tool is being run in hole or pulled out of the hole. This means that the swab cup is not compressed into a squat oversize shape susceptible to contact damage, and is naturally drawn out to tend towards an elongate shape in either direction of tool motion.

Abstract: A method of drilling and cleaning a wellbore includes providing a drill string having a drill bit and a cleaning tool with selectively activatable cleaning members; drilling a wellbore using the drill bit while maintaining the cleaning members in a deactivated position; and pulling the drill string from the wellbore with the cleaning members in an activated position, to thereby clean the wellbore. A corresponding cleaning tool includes a body having a bore running therethrough, a sleeve located within the bore, the sleeve including a ball seat and the sleeve being biased in a first direction, and a plurality of selectively activatable cleaning members mounted for repeated movement relative to the body between activated and deactivated positions.

Abstract: A downhole tool including a resilient body configured to be disposed on a drill string, the resilient body comprising a plurality of radial blades having an abrasive coating, wherein the radial blades are configured to deflect when inserted into downhole tubing, and wherein the resilient body is configured to allow rotation relative to the drill string. Additionally, a method for cleaning downhole tubing, the method including inserting a resilient scraper disposed on a drill string into the downhole tubing, the resilient scraper including a plurality of radial blades having an abrasive coating. The method further including rotating the drill string, and contacting the resilient scraper to an internal wall of the downhole tubing.

Abstract: An apparatus for cleaning the inner wall of wellbores and for capturing downhole wellbore debris. An elongated, tubular central mandrel is provided with recesses on its outer surface. Various service elements are interchangeably mounted over the split rings. The various service elements include stabilizers, brush assemblies, junk baskets and magnets.

Abstract: Work string-mounted cleaning tool and a method of assembling such tools using a quick release for the cleaning element. Oblong pad element has a curved upper surface with slots to receive work surface segments. Opposite edge has a part-circular recess with part-circular peripheral lip around an upper edge of the recess. A retainer fastening component in the recess has a core with socket adapted to receive a driving tool. The retainer is sized to permit it to rotate when mounted within the recess. Roll pins are provided for use in locating the fastener component in predetermined rotational configurations in relation to the recess. Shear pin is provided to inhibit unintended rotation of the fastener component, and to lock the retainer for normal use of the cleaning tool. Shearing of the shear pin permits disassembly of the tool.

Abstract: A drill pipe mountable wellbore cleaning tool apparatus is of an improved configuration that enables attachment to a drill pipe joint having first and second connector end portions and a cylindrically shaped portion in between the connector end portions. The drill pipe joint with attached debris cleaning tool or tools is made part of a drill string. The apparatus includes a support sleeve that is mounted to the drill pipe joint in between the connector end portions. The support sleeve abuts but does not invade the integrity of the cylindrical portion. Centralizers are attached to the opposing ends of the support sleeve, with each centralizer overlapping a portion of the support sleeve. The support sleeve carries one or more debris cleaning tools in between the centralizers. These tools enable debris to be removed from a wellbore. At least one locking clamp is attached to the cylindrical portion next to a said centralizer.

Abstract: A downhole jetting tool is provided for cleaning the interior of one or more hydraulic rams (14, 18) and one or more annular blowout preventers (26, 28). A unitary jetting tool body (40) has a central throughbore (42) and a plurality of radially outward jets (42, 46). A tapered landing shoulder (50) on the tool body engages a frustoconical surface of a landing ring (22) to position the tool in the well.

Abstract: A wellbore cleaning device having a unitary tool mandrel surrounded by a retaining sleeve that is rotatable with respect to the mandrel. A locking ring is used to secure the retaining sleeve to the mandrel. Cleaning blades are retained within recesses in the retaining sleeve and are biased radially outwardly from the recesses by springs.

Abstract: Systems and method for improving down hole operations of well casings are disclosed herein. Systems and methods disclosed herein can comprise brushes, high pressure fluid outlets, and skids. Other systems and methods are disclosed herein.

Abstract: An object for wiping a subterranean casing is described herein. The object may include an inner core with a first width. The ball may also include a deformable layer surrounding the inner core. The deformable layer may have a second width. The first width may be smaller than a diameter of at least one baffle within the subterranean casing. The second width may be larger than or equal to the largest inner diameter of the subterranean casing.

Abstract: There is described an apparatus device for mechanically loosening scale inside a pipe arranged to convey hydrocarbon fluids from a production zone in a well, in which an actuator arranged in a housing includes an axially movable stem which extends through at least part of the housing and is provided with at least one cam, at least one cutting means is arranged radially movable in a recess in the housing, the cam bearing, by the axial movement of the actuator towards a first extreme position, against the cutting means, applying to it a push force directed radially outwards. There is also described a method of mechanically loosening scale inside a pipe arranged to convey hydrocarbon fluids from a production zone by using the apparatus.

Abstract: Disclosed is an apparatus for cleaning the inner wall of wellbores and for capturing downhole wellbore debris. An elongated, tubular central mandrel is provided with recesses on its outer surface. Various service elements are interchangeably mounted over the split rings. The various service elements include stabilizers, brush assemblies, junk baskets and magnets.

Abstract: This invention relates to well cleaning methods and apparatus. In particular, this invention relates to a method of drilling and cleaning a wellbore. In one embodiment of the invention, a method of drilling and cleaning a wellbore (12) is disclosed. The method comprises the steps of providing a drill string (10) having a drill bit (28) and a cleaning tool (24) with selectively activatable cleaning members (34); drilling a wellbore using the drill bit while maintaining the cleaning members in a deactivated position; and pulling the drill string from the wellbore with the cleaning members in an activated position, to thereby clean the wellbore. A corresponding cleaning tool is also disclosed.

Abstract: A shearing tool for shearing, trimming, or reducing objects being pulled through a drill string and methods for retrieving retrievable tools with fins from the drill string, where the retrievable tools must pass through restrictions in the drill string having interior diameters less than the outer diameters of the fins. The fins, affixed to the retrievable tools, provide stability to the tools, while within the drill string, and can be made of rubber, plastic, other shearable materials, or combinations thereof. The apparatuses and methods include inserting a shearing tool with a flange into a box end of a section of drill string, where the flange keeps the shearing tool in place. The shearing tool further comprising a cutting surface for cutting materials pulled through the shearing tool.