Plural Selectively Shiftable Cutter Elements Patents (Class 175/266)
  • Patent number: 9670735
    Abstract: A drilling assembly for simultaneous hole enlargement operations comprises a drill bit, an adjustable diameter reamer, and a hole opener. The reamer is coupled with, and positioned uphole from the drill bit. The reamer is adjustable between a first diameter and a second diameter that is larger than the first diameter. The hole opener is coupled with, and positioned uphole from the reamer.
    Type: Grant
    Filed: March 27, 2009
    Date of Patent: June 6, 2017
    Assignee: Halliburton Energy Services, Inc.
    Inventors: Luk Servaes, Stefano Mancini
  • Patent number: 9341026
    Abstract: The present invention concerns an apparatus for modifying sidewalls of a borehole. The apparatus includes a longitudinal housing adapted to fit inside the borehole. The housing includes a first end portion, a second end portion, and a side portion between said end portions, adapted to face the sidewalls of the borehole. Means are provides on the side of the housing for removing material from said borehole sidewall. The housing is adapted to be rotated with a controlled rotational speed in relation to said borehole sidewalls and to be fed in a controlled rate of longitudinal motion in relation to said borehole. Furthermore, the invention relates to a method for making a borehole with internal, helical grooves.
    Type: Grant
    Filed: September 8, 2009
    Date of Patent: May 17, 2016
    Assignee: SINVENT AS
    Inventors: Mohammad Ali Taghipour Khadrbeik, Inge Manfred Carlsen
  • Publication number: 20140353032
    Abstract: An expandable reamer apparatus and methods for reaming a borehole, wherein a laterally movable blade carried by a tubular body may be selectively positioned at an inward position and an expanded position. The laterally movable blade, held inwardly by blade-biasing elements, may be forced outwardly by drilling fluid selectively allowed to communicate therewith by way of an actuation sleeve disposed within the tubular body. Alternatively, a separation element may transmit force or pressure from the drilling fluid to the movable blade. Further, a chamber in communication with the movable blade may be pressurized by way of a downhole turbine or pump. A ridged seal wiper, compensator, movable bearing pad, fixed bearing pad preceding the movable blade, or adjustable spacer element to alter expanded blade position may be included within the expandable reamer. In addition, a drilling fluid pressure response indicating an operational characteristic of the expandable reamer may be generated.
    Type: Application
    Filed: August 20, 2014
    Publication date: December 4, 2014
    Inventors: Steven R. Radford, Anurag Gautam, Robert A. Laing
  • Patent number: 8899352
    Abstract: This disclosure relates in general to a method and system for controlling a drilling system for drilling a borehole in an earth formation. More specifically, but not by way of limitation, embodiments of the present invention provide systems and methods for controlling dynamic interactions between the drilling system for drilling the borehole and an inner surface of the borehole being drilled to steer the drilling system to directionally drill the borehole. In another embodiment of the present invention, data regarding the functioning of the drilling system as it drills the borehole may be sensed and interactions between the drilling system for drilling the borehole and an inner surface of the borehole may be controlled in response to the sensed data to control the drilling system as the borehole is being drilled.
    Type: Grant
    Filed: February 13, 2009
    Date of Patent: December 2, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Ashley Johnson, Walter David Aldred, Geoffrey Downton, Riadh Boualleg, Kjell Haugvaldstad, Michael Sheppard
  • Publication number: 20140332283
    Abstract: Earth-boring tools may have a body, a cutting element attached to the body at a first location, and a formation-engaging structure attached to the body at a second location. The formation-engaging structure may be movable during a drilling operation between a first position and a second position. In the first position, the formation-engaging structure may be located rotationally behind the cutting element at a first radial distance from a longitudinal axis of the body at which the cutting element will at least initially shield the formation-engaging structure from engaging a formation. In the second position, the formation-engaging structure may be located at a different second radial distance from the longitudinal axis of the body at which the formation-engaging structure will engage a formation.
    Type: Application
    Filed: May 13, 2013
    Publication date: November 13, 2014
    Inventors: Eric Do, Juan Miguel Bilen, Philip Christof Schulte, Jason E. Hoines
  • Patent number: 8863863
    Abstract: An undercutting tool for producing transverse grooves in a drilled hole. An upper support and a lower support axially delimit a receiving region of a shank. At least two spreading elements are disposed in the receiving region between the spreading elements and the receiving region. The shank and the supports are disposed so the axial distance between the supports can be reduced by exerting an axial force. The spreading elements each have an oblique upper and lower end face, which each have such an outer geometric shape, extending in a direction not perpendicular to the longitudinal axis and are displaced in substantially opposite radial directions, and the axial force is in each case converted to a radial force in the radial directions.
    Type: Grant
    Filed: December 13, 2011
    Date of Patent: October 21, 2014
    Inventor: Josef Hasler
  • Patent number: 8820440
    Abstract: In one aspect of the present invention, a steering assembly for downhole directional drilling comprises an outer bit comprising a bore and an outer cutting area and in inner bit comprising an inner cutting area and connected to a shaft that is disposed within the bore. At least one biasing mechanism is disposed around the shaft. At least one fluid channel is disposed within the outer bit and redirects fluid to the at least one biasing mechanism causing the at least one biasing mechanism to push the shaft and alter an axis of the inner bit with respect to an axis of the outer bit.
    Type: Grant
    Filed: November 30, 2010
    Date of Patent: September 2, 2014
    Inventors: David R. Hall, Scott Dahlgren, Jonathan Marshall
  • Patent number: 8763726
    Abstract: The present specification describes a drill bit for drilling a cavity. The drill bit may include a chassis, a plurality of gauge pad sets, and at least one gauge pad structure. The chassis may be configured to rotate about an axis. The plurality of gauge pad sets may each include at least one gauge pad. The at least one gauge pad structure may moveably couple at least one of the gauge pads of at least one of the plurality of gauge pad sets with the chassis.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: July 1, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Ashley Bernard Johnson, Michael Charles Sheppard, Geoff Downton
  • Patent number: 8757294
    Abstract: This disclosure relates in general to a method and system for controlling a drilling system for drilling a borehole in an earth formation. More specifically, but not by way of limitation, embodiments of the present invention provide systems and methods for controlling dynamic interactions between the drilling system for drilling the borehole and an inner surface of the borehole being drilled to steer the drilling system to directionally drill the borehole. In another embodiment of the present invention, data regarding the functioning of the drilling system as it drills the borehole may be sensed and interactions between the drilling system for drilling the borehole and an inner surface of the borehole may be controlled in response to the sensed data to control the drilling system as the borehole is being drilled.
    Type: Grant
    Filed: August 15, 2007
    Date of Patent: June 24, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Ashley Johnson, Walter David Aldred, Geoffrey Charles Downton, Riadh Boualleg, Kjell Haugvaldstad, Michael Sheppard
  • Patent number: 8720604
    Abstract: A drill bit direction system and method is disclosed that modifies or biases the stochastic movement of the drill bit to change a drilling direction of a drilling system. The direction of the drill bit is monitored to determine if the direction happens to align in some way with a preferred direction. If the direction isn't close enough to a preferred or desired direction, stochastic motion of the drill bit in the borehole may be controlled and/or motion of the drill bit under a side force acting on the drill bit to direct the drilling may be focused or biased to modify the direction of drilling closer to the preferred direction. Any of a number of stochastic motion control mechanisms or biasing mechanisms can be used. Some embodiments can resort to conventional steering mechanisms to supplement the stochastic motion control or side force biasing mechanisms.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: May 13, 2014
    Assignee: Schlumberger Technology Corporation
    Inventors: Michael Charles Sheppard, Ashley Bernard Johnson, Geoff Downton
  • Publication number: 20140048336
    Abstract: A reamer is designed to enhance operation of a bottom hole assembly in which it is included. One or more capabilities and/or characteristics of the cutters carried by the reamer blocks of the reamer may be varied even in the same profile portion to enhance the functionality and/or durability of the reamer.
    Type: Application
    Filed: August 14, 2012
    Publication date: February 20, 2014
    Applicant: Chevron U.S.A. Inc.
    Inventor: Graham MENSA-WILMOT
  • Patent number: 8528668
    Abstract: An electronically activated tool (50) comprising a tool body, cutter blocks and sensors with means for attachment to a drilling support and rotation so as to permit the simultaneous underreaming and measurement of the diameter of a wellbore (especially in oil and gas drilling) characterized by a means of activation using an electronic signal sent by mud-pulse, fiber-optics, wireless transmission or other means which may also communicate commands and receive data from the underreamer during drilling, at least one radially extendable cutter block (62) incorporating positional sensors adapted to measure the relative position of the cutter block to the tool, at least one calliper means (76) to measure wellbore diameter, all of which are inter-linked by a means of communication using receivers, sensors and microprocessors and a system that optimizes underreaming or expansion (22) by simultaneously comparing and correlating wellbore diameter data (22) and underreaming parameters in real-time or in memory.
    Type: Grant
    Filed: June 16, 2011
    Date of Patent: September 10, 2013
    Inventor: Wajid Rasheed
  • Publication number: 20130056281
    Abstract: A well bore reamer has an elongated body for coupling between members of a well string, a first set of cutting elements on the body at a fixed position, a second set of cutting elements on a sleeve closing around a sleeve carrying portion of the elongated body. The sleeve is slidable along a longitudinal axis of the body and rotatable thereabout. A lower clutch mechanism operates between the sleeve and the elongated body at a bottom end of the body's sleeve carrying portion to block rotation of the sleeve relative to the elongated body in a predetermined direction about the longitudinal axis under sliding of the sleeve into a lowered position adjacent said bottom end of the sleeve carrying portion.
    Type: Application
    Filed: April 2, 2012
    Publication date: March 7, 2013
    Inventor: Bradley Allan Lamontagne
  • Patent number: 8381843
    Abstract: A well bore reamer has an elongated body for coupling between members of a well string, a first set of cutting elements on the body at a fixed position, a second set of cutting elements on a sleeve closing around a sleeve carrying portion of the elongated body. The sleeve is slidable along a longitudinal axis of the body and rotatable thereabout. A lower clutch mechanism operates between the sleeve and the elongated body at a bottom end of the body's sleeve carrying portion to block rotation of the sleeve relative to the elongated body in a predetermined direction about the longitudinal axis under sliding of the sleeve into a lowered position adjacent said bottom end of the sleeve carrying portion.
    Type: Grant
    Filed: April 2, 2012
    Date of Patent: February 26, 2013
    Inventor: Bradley Allan Lamontagne
  • Publication number: 20120193147
    Abstract: In one aspect of the invention, an expandable tool for an earth boring system comprises a through bore configured to accommodate drilling fluid. A blade is configured to extend and retract out of an outer surface of the tool. A secondary fluid pathway connects the bore with an interface between the outer surface of the tool and a surface of the blade. The secondary pathway directs drilling fluid through the interface.
    Type: Application
    Filed: January 28, 2011
    Publication date: August 2, 2012
    Inventors: David R. Hall, Scott Dahlgren, Jonathan Marshall
  • Publication number: 20120168229
    Abstract: An expandable downhole tool apparatus is disclosed. The apparatus comprises a body adapted to be incorporated into a drill string and at least one working member moveable relative to the body between an inward deactivated position and an outwardly deployed activated position in order to engage the wall of a borehole. Activation means adapted to move at least one said working member between the inward deactivated position and outwardly deployed activated position is provided. At least one passage is formed through the body and extends from a location on the body adjacent at least one working member to a location remote from the respective working member to enable debris accumulating underneath the respective working member to move along the passage and exit the body.
    Type: Application
    Filed: August 20, 2010
    Publication date: July 5, 2012
    Inventor: Paul Bernard Lee
  • Patent number: 8118099
    Abstract: A method for forming and sealing a hole in a sidewall of a borehole may include conveying a bit and a sealer into the borehole using a carrier, forming a hole in the sidewall using the bit, and introducing a sealant from the sealer to the hole along a surface portion of the bit. An apparatus for forming and sealing a hole in a sidewall of a borehole includes a carrier conveyable into the borehole, a bit disposed on the carrier that forms the hole in a sidewall, and a sealer operable to introduce a sealant to the hole along a surface portion of the bit.
    Type: Grant
    Filed: October 1, 2008
    Date of Patent: February 21, 2012
    Assignee: Baker Hughes Incorporated
    Inventors: Michael J. Moody, John M. Michaels
  • Patent number: 8066085
    Abstract: A drill bit direction system and method is disclosed that modifies or biases the stochastic movement of the drill bit and/or stochastic interactions between the drill bit and an inner-wall of a borehole being drilled by a drilling system to change the direction of drilling of the drilling system. The direction of the drill bit is monitored to determine if the direction happens to align in some way with a preferred direction. If the direction isn't close enough to a preferred direction, a biasing mechanism modifies the stochastic movement in an attempt to modify the direction closer to the preferred direction. Any of a number of biasing mechanisms can be used. Some embodiments can resort to conventional steering mechanisms to supplement the biasing mechanism.
    Type: Grant
    Filed: May 7, 2008
    Date of Patent: November 29, 2011
    Assignee: Schlumberger Technology Corporation
    Inventors: Ashley Bernard Johnson, Michael Charles Sheppard, Geoff Downton
  • Patent number: 7931098
    Abstract: A drilling system includes a steerable bottomhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string or drill bit, can include a dynamically adjustable articulated joint having a plurality of elements that deform in response to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. The force pads are actuated by a shape change material that deforms in response to an excitation signal. A method of directional drilling includes continuously cycling the position of the steering unit based upon the rotational speed of the drill string and/or drill bit and with reference to an external reference point.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: April 26, 2011
    Assignee: Baker Hughes Incorporated
    Inventors: Peter Aronstam, Roger Fincher, Larry Watkins
  • Patent number: 7909100
    Abstract: Casing cutter for severing multiple tubulars in a well bore has a pair of cutter blades pivotally mounted on a support body. The blades are pivotally mounted for gradual movement outside of the support body when downward force is applied to proximate ends of the cutter blades. The support body is rotated inside the innermost of the multiple tubulars, while the cutter blades sever the tubulars of progressively increasing diameter. Should the cutter blades or pivotal connections become unusable, the tool body can be rotated about the vertical axis and secured to a downhole string by the opposite end. A substitute pair of cutter blades are then engaged on the tool body and operated to cut the casings similar to the first set of the cutter blades.
    Type: Grant
    Filed: June 26, 2008
    Date of Patent: March 22, 2011
    Assignee: Deltide Fishing & Rental Tools, Inc.
    Inventors: Charles Larue Bryant, Jr., David J. Ruttley
  • Patent number: 7836975
    Abstract: A bottom hole assembly for drilling a cavity including a chassis configured to rotate is provided. The chassis may include a conduit, a circuit, a pressure transfer device, a plurality of pistons, a plurality of valves, and a plurality of cutters. The conduit may accept a first flow of a primary fluid. The circuit may have a second flow of a secondary fluid. The pressure transfer device may be configured to transfer pressure between the flows. The pistons may be operably coupled with the circuit, and each piston may be configured to move based at least in part on a pressure of the circuit at that piston, with the valves possibly configured to control a pressure of the circuit at each piston. Each cutter may be coupled with one of the pistons.
    Type: Grant
    Filed: October 24, 2007
    Date of Patent: November 23, 2010
    Assignee: Schlumberger Technology Corporation
    Inventors: Kuo-Chiang Chen, Geoff Downton
  • Patent number: 7802637
    Abstract: A drilling system includes a steerable bottomhole assembly (BHA) having a steering unit and a control unit that provide dynamic control of drill bit orientation or tilt. Exemplary steering units can adjust bit orientation at a rate that approaches or exceeds the rotational speed of the drill string or drill bit, can include a dynamically adjustable articulated joint having a plurality of elements that deform in response to an excitation signal, can include adjustable independently rotatable rings for selectively tilting the bit, and/or can include a plurality of selectively extensible force pads. The force pads are actuated by a shape change material that deforms in response to an excitation signal. A method of directional drilling includes continuously cycling the position of the steering unit based upon the rotational speed of the drill string and/or drill bit and with reference to an external reference point.
    Type: Grant
    Filed: October 30, 2007
    Date of Patent: September 28, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Peter Aronstam, Roger Fincher, Larry Watkins
  • Patent number: 7757787
    Abstract: An expandable drilling apparatus includes a main body comprising a central bore and at least one axial recess configured to receive an arm assembly operable between a retracted position and an extended position, a biasing member to urge the arm assembly into the retracted position, a drive position configured to thrust the arm assembly into the extended position when in communication with drilling fluids in the central bore, a selector piston translatable between an open position and a closed position, wherein the selector piston is thrust into the open position when a pressure of the drilling fluids exceeds an activation value, wherein the drilling fluids are in communication with the drive piston when the selector piston is in the open position, and a selector spring configured to thrust the selector piston into the closed position when the pressure of the drilling fluids falls below a reset value.
    Type: Grant
    Filed: January 31, 2007
    Date of Patent: July 20, 2010
    Assignee: Smith International, Inc.
    Inventors: Alexander Craig Mackay, George Armando Espiritu, Charles H. Dewey
  • Publication number: 20100006338
    Abstract: A drilling apparatus includes a tubular body including an upper connection and a lower connection with a drill bit disposed thereon, and an axial borehole therethrough, wherein the upper connection is configured to attach to a drillstring, primary cutter blocks coupled to the tubular body and configured to selectively expand radially therefrom. The drilling apparatus further includes backup cutter blocks coupled to the tubular body and configured to selectively expand radially therefrom, and an activation system configured to selectively expand and collapse the primary and backup cutter blocks in response to changes in weight applied to the primary and backup cutter blocks.
    Type: Application
    Filed: July 8, 2009
    Publication date: January 14, 2010
    Applicant: Smith International, Inc.
    Inventor: Praful C. Desai
  • Patent number: 7493971
    Abstract: An expandable downhole tool comprises a tubular body, at least one moveable arm disposed within the tubular body and being radially translatable between a retracted position and a wellbore engaging position, and at least one piston operable to mechanically support the at least one moveable arm in the wellbore engaging position when an opposing force is exerted. A method of reaming a formation to form an enlarged borehole in a wellbore comprising disposing an expandable reamer in a retracted position in the wellbore, expanding at least one movable arm of the expandable reamer radially outwardly into engagement with the formation, reaming the formation with the at least one moveable arm to form the enlarged borehole; and mechanically supporting the at least one moveable arm in the radially outward direction during reaming.
    Type: Grant
    Filed: May 5, 2004
    Date of Patent: February 24, 2009
    Assignee: Smith International, Inc.
    Inventors: Kenneth M. Nevlud, Timothy P. Beaton
  • Patent number: 7383900
    Abstract: A drill bit for drilling a borehole in an object, the drill bit having a central longitudinal axis and comprising a bit body provided with a central shank for connecting the drill bit to a drilling system. The drill bit further comprises at least one cutting arm, each cutting arm being provided with a set of cutters for cutting the object and being coupled to the bit body allowing the cutting arm to pivot between a radially retracted position and a radially expanded position.
    Type: Grant
    Filed: May 19, 2004
    Date of Patent: June 10, 2008
    Assignee: Shell Oil Company
    Inventor: Djurre Hans Zijsling
  • Patent number: 7370712
    Abstract: An under reamer for expanding a borehole through an earthen formation is taught. The under reamer includes: a mandrel including an end for connection into a drill string and an opposite end and a housing including an inner bore, telescopically disposed over the mandrel and axially moveable relative to the mandrel but rotationally moveable with the mandrel. A plurality of under reamer arms are carried on the housing, the under reamer arms are formed as blocks including cutter-supporting portions in which poly-crystalline diamond compact cutters are mounted. The under reamer arms are moveable by driving the housing axially over the mandrel between a retracted position extending into the bore of the housing and an expanded position wherein the under reamers arms are pivoted out of the housing inner bore and supported therebehind by the mandrel such that the cutter-supporting portions are exposed for use to enlarge a borehole.
    Type: Grant
    Filed: May 29, 2003
    Date of Patent: May 13, 2008
    Assignee: Tesco Corporation
    Inventors: Mark Clifton Stout, Cristian Mihai Catrinescu, Bruno H. Walter
  • Patent number: 7314099
    Abstract: An expandable downhole tool comprises a tubular body having an axial flowbore extending therethrough, at least one moveable arm, and a selectively actuatable sleeve that prevents or allows the at least one moveable arm to translate between a collapsed position and an expanded position. A method of expanding the downhole tool comprises disposing the downhole tool within the wellbore, biasing the at least one moveable arm to a collapsed position corresponding to an initial diameter of the downhole tool, flowing a fluid through an axial flowbore extending through the downhole tool while preventing the fluid from communicating with a different flowpath of the downhole tool, allowing the fluid to communicate with the different flowpath by introducing an actuator into the wellbore, and causing the at least one moveable arm to translate to an expanded position corresponding to an expanded diameter of the downhole tool.
    Type: Grant
    Filed: May 18, 2006
    Date of Patent: January 1, 2008
    Assignee: Smith International, Inc.
    Inventors: Charles H. Dewey, Wei Xu
  • Patent number: 7306056
    Abstract: A bottomhole assembly (BHA) for single trip sidetracking operations has a mill for forming an open hole section in a cased wellbore and a steering unit for controlling drill bit orientation. During use, the drilling system is assembled at the surface and tripped into the wellbore. The mill is positioned adjacent a kick-off point and operated to form an open hole section. Thereafter, the drill bit is positioned adjacent the open hole section. An exemplary steering unit includes one or more force application members that, when energized, displace the drill bit such that the bit is pointed in a specified direction into the open hole section. The steering unit also includes one or more force application members that facilitate directional drilling through the open hole section. Other suitable steering units can employ devices that alter the BHA centerline geometry.
    Type: Grant
    Filed: October 29, 2004
    Date of Patent: December 11, 2007
    Assignee: Baker Hughes Incorporated
    Inventors: Ray Ballantyne, Joachim Oppelt
  • Patent number: 7195080
    Abstract: A system is provided (1) for increasing the diameter of at least a portion of a well bore, the system being intended to be attached to a drill pipe (3), the system having a support element (10) bearing cutting arms (13, 14) which is movably mounted with respect to a body (4) and wherein the arms and the chamber (6) of the body (4) are designed so as to cooperated. A method is also provided for increasing the diameter of at least a portion of a well bore by drilling.
    Type: Grant
    Filed: June 1, 2001
    Date of Patent: March 27, 2007
    Inventor: Italo De Luca
  • Patent number: 6902014
    Abstract: A roller cone bi-center bit for economically drilling an enlarged borehole below casing in earth formation is provided. The bi-center bit includes a rolling cone cutter or other appropriate cutter to enlarge a pilot bore also made by rolling cone or other type of cutters. The bit comprises a single-diameter body with a recess to accommodate the trailing cutter which enlarges the pilot bore. The bi-center bit may also provide the ability to change out the cutters efficiently in the field. The cutters are oriented to enhance drilling out the cement plug at the bottom of the casing. The cone cutter may be also be mounted on segments which are designed to be easily removed for replacement or adjustment in position in the field.
    Type: Grant
    Filed: August 1, 2002
    Date of Patent: June 7, 2005
    Assignee: Rock Bit L.P.
    Inventor: Roy D. Estes
  • Patent number: 6892815
    Abstract: A coalbed methane borehole pipe liner perforation system comprises a plastic pipe punch that slips down inside a coalbed methane production borehole lined with a non-perforated plastic pipe. A ground-penetrating radar is used inside the plastic-pipe lined borehole to determine which sections of the pipe are in contact with groundwater. The punch is then operated along the length of the plastic-pipe lined borehole to perforate it for methane-gas collection wherever such groundwater is not present. A radar survey to determine groundwater contact can be made simultaneously in combination with the punching of liner pipe perforations, or earlier in a separate operation.
    Type: Grant
    Filed: November 4, 2002
    Date of Patent: May 17, 2005
    Inventor: Larry G. Stolarczyk
  • Publication number: 20040206547
    Abstract: System (1) for increasing the diameter of at least a portion of a well bore, the system being intended to be attached to a drill pipe (3), the system having the improvement that the support element (10) bearing the curring arms (13, 14) is movably mounted with respect to the body (4) and that the arms and the chamber (6) of the body (4) are designed so as to cooperate.
    Type: Application
    Filed: June 2, 2004
    Publication date: October 21, 2004
    Inventor: Italo de Luca
  • Patent number: 6668949
    Abstract: An underreamer (5) is formed from a tubular body (10) having a longitudinal bore therethrough, and providing an integral piston actuator (20) responsive to hydraulic pressure to move cutters (40) into engagement with the well bore and springs (60) to resist premature engagement of the cutter arms (40) and to return the cutters (40) to the body upon conclusion of the underreaming job. Skewed longitudinal grooves (45) are formed in the tubular body thereby permitting the flowpath through the underreamer to provide substantially the same inner diameter throughout the tool (5).
    Type: Grant
    Filed: August 17, 2001
    Date of Patent: December 30, 2003
    Inventor: Allen Kent Rives
  • Patent number: 6427788
    Abstract: A drilling apparatus for underreaming includes a top sub, a pressure sleeve mated to the top sub, and a blade body mated to the pressure sleeve. A pilot bit is mated to the lower end of the blade body. A plurality of movable cutting blades are pivotably attached to the blade body by pivot pins. Each of the pins is inserted through the blade body and the cutting blade. Slidable covers, held in place by the pressure sleeve, are used to retain the pins. A mandrel is centrally positioned with respect to the pressure sleeve and the blade body and is axially movable therein. Each of the cutting blades includes an end which is operatively associated with channels transversely formed on one end of the mandrel. Movement of the mandrel in a first axial direction effects retraction of the cutting blades. Movement of the mandrel in a second axial direction effects extension of the cutting blades. The mandrel is held in its blade-retracting position by the biasing force of a spring.
    Type: Grant
    Filed: September 22, 2000
    Date of Patent: August 6, 2002
    Assignee: Emerald Tools, Inc.
    Inventor: William D. Rauchenstein
  • Patent number: 5971085
    Abstract: A downhole unit for use in subsurface boreholes, for example a bias unit for imparting a lateral bias to the drill bit to control the direction of drilling, includes a main body and a number of pads pivotally mounted on the main body for engagement with the walls of the borehole. A thrust member is disposed inwardly of each pivotal pad and is movable along a guide passage in the main body to transmit movement to the pad. Each thrust member is movable by hydraulic pressure and a fluid-tight sliding seal is provided between the thrust member and its guide passage. The outer surface of each thrust member or the inner surface of the guide passage, or both, is in the form of a portion of a toroid centred on the pivot axis of the respective pad so as to minimise lateral movement of the seal as the thrust member moves along the passage. This also allows relative displacement between the thrust member and pad to be avoided, so that the thrust member can be integral with the pad or rigidly connected to it.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: October 26, 1999
    Assignee: Camco International (UK) Limited
    Inventor: Mark Colebrook
  • Patent number: 5957224
    Abstract: A method to drill a hole in the soil by a bit assembly and a bit assembly comprising a ring-shaped bit (2) to drill the outer circle of the hole and to which a protection tube system (4), mounted in the hole while drilling, is coupled, and a cylindric inner bit (1) to drill the center portion of the hole, from which bit at least the rotative motion is transmitted to the outer bit (2). Drilling by the outer bit (2) and pulling out the protection tube (4) are disconnected upon need by reverse rotation of the inner bit, whereafter drilling is continued with the inner bit (1) only.
    Type: Grant
    Filed: August 12, 1997
    Date of Patent: September 28, 1999
    Inventor: Valto Ilomaki
  • Patent number: 5074355
    Abstract: A section mill for cutting through well casing, the mill including multiple sets of cutting blades which are selectively engaged to continue cutting operations as blades dull. The cutting blade sets are selectively indexable such that as a first set dulls or fails a succeeding set can be utilized following retraction of the first set. The section mill includes a central mandrel having offset cammed surfaces which engage the cutting blades and cause them to expand outwardly. The mandrel is axially displaceably by a piston affected by hydraulic pressure. As the mandrel is axially displaced the indexed cutting blades are expanded by the cammed surface. Indexing is accomplished by a cam drum which allows the mandrel to be rotated relative to the cutting blades in order to align the next cammed surfaces with their respective cutting blades.
    Type: Grant
    Filed: August 10, 1990
    Date of Patent: December 24, 1991
    Assignee: MASX Energy Services Group, Inc.
    Inventor: W. L. Lennon
  • Patent number: 5036921
    Abstract: An underreamer tool has a body with upper and lower portions having an upper cutter blade slot extending transversely through the upper portion and a lower cutter blade slot extending transversely through the lower portion at a right angle thereto. The upper and lower portions have central bores separated by a wall and connected by upper and lower fluid flow passageways bypassing the cutter blade slots. An upper pair of cutter blades mounted in the upper cutter blade slot and a lower pair of cutter blades mounted in the lower cutter blade slot move between a retracted position within the slots and an extended position outward therefrom. An upper piston in the central bore above the upper cutter blade slot has its bottom end engaged on the upper cutter blades and a lower piston in the central bore above the lower cutter blade slot has its bottom end engaged on the lower cutter blades.
    Type: Grant
    Filed: June 28, 1990
    Date of Patent: August 6, 1991
    Assignee: Slimdril International, Inc.
    Inventors: Fred J. Pittard, Jimmy D. Fultz
  • Patent number: 4809793
    Abstract: A downhole cutting tool, specifically adapted to function as an enhanced diameter clean-out tool, includes longitudinal bores which are opened to fluid flow when cutting members are moved to their extended positions. Upper and lower subassemblies are connected through an adapter which establishes an angular offset between an upper pair of extendible members and a lower pair of extendible members, which upper pair functions as a stabilizing structure to stabilize rotation of the tool and which lower pair functions as an enhanced diameter cutter.
    Type: Grant
    Filed: October 19, 1987
    Date of Patent: March 7, 1989
    Inventor: Charles D. Hailey
  • Patent number: 4153121
    Abstract: The invention herein relates to an undercutting device which is provided with a substantially tubular body adapted to be placed within a parallel-sided hole. A rotary percussion head is provided at one end of the body and has one or more cutting tools which extend radially therefrom at an obtuse angle and which cutting tools are adapted to cut outwardly from the radius of the body, means are provided for rotating the head about the axis of the body and for operating the percussion head at one predetermined depth in the hole so that the cutting tools may act on the wall of the parallel-sided hole.
    Type: Grant
    Filed: December 13, 1976
    Date of Patent: May 8, 1979
    Assignee: John MacDonald & Company (Pneumatic Tools) Ltd.
    Inventor: David T. Allan