With Storage Means For Bit Lubricant Carried By Bit Or Shaft Patents (Class 175/227)
  • Patent number: 9657528
    Abstract: An earth boring bit with sealed cutter bearings has lubricant flow passages which extend from an interior cavity of the bit body to spaces located between bearing shafts and rotary cutters. A lubricant compensator has an elongate body defined by a tube which has a first end disposed in one of the flow passages and a second end which extends into the interior cavity. A piston is initially disposed in the second end, biased to apply pressure to lubricant located in the flow passages. The first end has a section for receiving the piston when lubricant is expelled from within the tube. Apertures extend through a sidewall of the tube, spaced apart from the section in the first end and in fluid communication with the flow passages. The apertures, the flow passages, and the spaces located between bearing shafts and rotary cutters are sized for passing drilling fluid.
    Type: Grant
    Filed: October 28, 2014
    Date of Patent: May 23, 2017
    Assignee: PDB TOOLS, INC.
    Inventor: Nam Duy Nguyen
  • Publication number: 20150136489
    Abstract: The present invention relates to apparatus and methods for remotely adjusting the drill bit hydraulic horse power per square inch (HSI). Varying the nozzle geometry remotely without the need to pull the drill string outside the hole has obvious advantage. Changing the nozzle flow geometry results in changing the nozzle HSI, which is beneficial to optimize drilling a well having different rock formations. The drill bit nozzle geometry of the present invention can be varied by causing a change of at least one physical property of the environment. The variable geometry nozzle is not limited to drill bit, it can be placed within the inner flow passage or between the inner flow passage and annular flow passage for controlling flow profile within a wellbore, a tubular string or a flow conduit.
    Type: Application
    Filed: November 17, 2013
    Publication date: May 21, 2015
    Inventors: Ahmed Tahoun, Raed I. Kafafy, Karam J. Jawamir, Mohammed A. Aldheeb, Abdul Mushawwir Khalil
  • Patent number: 8865309
    Abstract: The present invention includes compositions and methods of supplying a corrosion inhibitor including placing a corrosion inhibitor attached to a nanostructure carrier, placing the nanostructure carrier containing the corrosion inhibitor at a location and the nanostructure carrier is capable of releasing the corrosion inhibitor.
    Type: Grant
    Filed: January 28, 2013
    Date of Patent: October 21, 2014
    Assignee: National Oilwell Varco, L.P.
    Inventors: Deepthi R. Setlur, Stefan M. Butuc
  • Publication number: 20140246245
    Abstract: A drill bit of the type used to drill a wellbore in the earth can comprise a bore formed in the drill bit, and a plug sealingly and reciprocably disposed in the bore, whereby the plug prevents fluid communication between sections of the bore in the drill bit. The plug can comprise a spherically-shaped member. The plug can comprise a floating plug sealingly and reciprocably disposed in the bore, whereby pressure in the different sections of the bore on respective opposite sides of the plug is substantially equalized.
    Type: Application
    Filed: May 15, 2014
    Publication date: September 4, 2014
    Applicant: HALLIBURTON ENERGY SERVICES, INC.
    Inventor: Micheal B. CRAWFORD
  • Publication number: 20140238742
    Abstract: A device for supplying lubricant to a lubrication point in a machine, a tunnel boring machine, for example, includes a lubrication pump unit and a control unit. The lubrication pump unit is configured to supply a quantity of the lubricant to the lubrication point, and the control unit is configured to regulate the quantity of lubricant based on a sensor measurement signal. The sensor measurement signal may be based on a temperature measured in a region of the lubrication point, a pressure measured in a region of the lubrication point, a measured viscosity of the lubricant, a measured dielectricity of the lubricant, a measured water content of the lubricant, a vibration intensity measured at a part of the machine, or a measured rotational speed of a part of the machine.
    Type: Application
    Filed: February 27, 2014
    Publication date: August 28, 2014
    Applicant: SKF Lubrication Systems Germany AG
    Inventors: Andreas Borek, Juergen Kreutzkaemper, Sefan Frank, Stefan Schuermann
  • Patent number: 8800689
    Abstract: A drill bit of the type used to drill a wellbore in the earth can comprise a bore formed in the drill bit, and a plug sealingly and reciprocably disposed in the bore, whereby the plug prevents fluid communication between sections of the bore in the drill bit. The plug can comprise a spherically-shaped member. The plug can comprise a floating plug sealingly and reciprocably disposed in the bore, whereby pressure in the different sections of the bore on respective opposite sides of the plug is substantially equalized.
    Type: Grant
    Filed: December 5, 2012
    Date of Patent: August 12, 2014
    Assignee: Halliburton Energy Services, Inc.
    Inventor: Michael B. Crawford
  • Publication number: 20140000966
    Abstract: A wellbore tool includes a non-hydrocarbon-based grease disposed between a first component and a second component. The grease remains substantially impermeable to hydrocarbons at temperatures up to at least about 150° C. and possibly up to at least about 200° C., and pressures up to at least about 27 MPa and possibly to at least about 50 MPa. Methods of forming such wellbore tools include selecting a grease to comprise a non-hydrocarbon-based grease that remains at least substantially impermeable to hydrocarbons at temperatures up to at least about 150° C. and possibly up to at least about 200° C., and pressures up to at least about 27 MPa and possibly to at least about 50 MPa; and disposing the grease at an interface between a first component of a wellbore tool and a second component of a wellbore tool.
    Type: Application
    Filed: June 29, 2012
    Publication date: January 2, 2014
    Applicant: BAKER HUGHES INCORPORATED
    Inventors: Karsten Fuhst, Jan C. Bertke
  • Patent number: 8579046
    Abstract: A pressure compensation assembly for a drill bit having a cavity to receive the pressure compensation assembly, a mud port connected to the cavity, and a lubricant passageway connected to the cavity, is disclosed. The pressure compensation assembly includes a relief mechanism having a selected operating pressure. The pressure compensation assembly is movable from a first position to a second position within the cavity. The pressure compensation assembly may receive lubricant at a pressure exceeding the selected operating pressure to permit the flow of lubricant into the lubricant passageway while substantially preventing the release of lubricant into the mud port while in the first position. The pressure compensation assembly is operable to limit a pressure differential within the drill bit while in the second position.
    Type: Grant
    Filed: September 13, 2007
    Date of Patent: November 12, 2013
    Assignee: Burintekh USA, LLC
    Inventors: Michael Burl Crawford, Pele Jason Nunley
  • Publication number: 20130192900
    Abstract: Surface texturing is employed to modify the topography of one or more surfaces (radial or cylindrical) of the bearing system for a roller cone rock bit. The surface texturing results in a dimpled surface which retains additional lubricant helpful in reducing friction in the boundary and mixed lubrication regimes. Shot peening is disclosed as one method for texturing the desired surface.
    Type: Application
    Filed: March 13, 2013
    Publication date: August 1, 2013
    Applicant: Varel International Ind., L.P.
    Inventor: Varel International Ind., L.P.
  • Publication number: 20130098688
    Abstract: A drill bit may include a bit body rotatable about a longitudinal axis and having, at one end, a connection for securing the drill bit to a drill string and having a face opposite the connection end; and a plurality of cutting structures having at least one fixed cutting structure disposed on the bit body face and at least one cutting body rotatably attached to the face of the bit body; wherein, in a rotated view of the plurality of cutting structures into a single plane, there is substantially no radial overlap between at least one fixed cutting structure and the at least one cutting body.
    Type: Application
    Filed: October 15, 2012
    Publication date: April 25, 2013
    Applicant: SMITH INTERNATIONAL, INC.
    Inventor: Smith International, Inc.
  • Patent number: 8397838
    Abstract: A bore hole rotary reamer includes a body having cutters rotatably mounted by one or more respective spindles. A bearing region is formed on the spindle. At least one annular seal prevents ingress of contaminant to the bearing region. A circumferential void is formed adjacent the seal. At least one passageway extends in an axial direction of the spindle to the circumferential void and a piston movable in the passageway in response to supply of pressure to an outer side of the piston from the environment which surrounds the reamer. The piston transfers pressure to fluid in the cylindrical passage on an inner side of the piston to supply pressure to the circumferential void and thereby to the seal. The pressure is substantially determined by the pressure of the environment surrounding the reamer.
    Type: Grant
    Filed: October 5, 2010
    Date of Patent: March 19, 2013
    Assignee: Gearhart United Pty Ltd
    Inventor: Terry Michael McManus
  • Patent number: 8383559
    Abstract: The present invention includes compositions and methods of supplying a corrosion inhibitor including placing a corrosion inhibitor attached to a nanostructure carrier, placing the nanostructure carrier containing the corrosion inhibitor at a location and the nanostructure carrier is capable of releasing the corrosion inhibitor.
    Type: Grant
    Filed: October 13, 2010
    Date of Patent: February 26, 2013
    Assignee: National Oilwell Varco, L.P.
    Inventors: Deepthi R. Setlur, Stefan M. Butuc
  • Patent number: 7975782
    Abstract: An earth bit includes a cutting cone mounted to a lug to form a bearing cavity. A valve is in fluid communication with the bearing cavity and a bit chamber, wherein the valve includes a diaphragm with an aperture. The aperture is repeatably moveable between open and closed conditions in response to a pressure difference between the material in the bearing cavity and bit chamber.
    Type: Grant
    Filed: August 18, 2007
    Date of Patent: July 12, 2011
    Assignee: Atlas Copco Secoroc LLC
    Inventor: Gregory W. Peterson
  • Publication number: 20100230170
    Abstract: A pressure compensation assembly for a drill bit having a cavity to receive the pressure compensation assembly, a mud port connected to the cavity, and a lubricant passageway connected to the cavity, is disclosed. The pressure compensation assembly includes a relief mechanism having a selected operating pressure. The pressure compensation assembly is movable from a first position to a second position within the cavity. The pressure compensation assembly may receive lubricant at a pressure exceeding the selected operating pressure to permit the flow of lubricant into the lubricant passageway while substantially preventing the release of lubricant into the mud port while in the first position. The pressure compensation assembly is operable to limit a pressure differential within the drill bit while in the second position.
    Type: Application
    Filed: September 13, 2007
    Publication date: September 16, 2010
    Applicant: Burintekh USA, LLC
    Inventors: Michael Burl Crawford, Pele Jason Nunley
  • Patent number: 7708090
    Abstract: An elastomeric seal ring is located between each bearing pin and each cone of an earth-boring bit. An excluder ring or band is imbedded within the inner diameter of the seal ring. A portion of the inner diameter of the seal ring as well as the excluder ring are in dynamic sealing contact with the bearing pin. The excluder ring may be harder and more wear resistant than the seal ring. The excluder ring may have lubricating properties. An outer excluder ring may be located on the outer diameter of the seal ring for engaging the cone to resist rotation.
    Type: Grant
    Filed: July 12, 2006
    Date of Patent: May 4, 2010
    Assignee: Baker Hughes Incorporated
    Inventors: Anton Zahradnik, Gregory L. Ricks, Gregory W. Peterson, Don Quy Nguyen, Chih C. Lin, Terry J. Koltermann
  • Publication number: 20090236147
    Abstract: A method for lubricating a diamond bearing system of a downhole well tool involves dispensing a polyol lubricant for the reduction of friction between the two diamond surfaces. The lubricant forms a reduced friction surface film on the diamond. The polyol lubricant may be mixed with water. The polyol lubricant may contain ethylene glycol, glycerol, or a combination with water.
    Type: Application
    Filed: March 20, 2008
    Publication date: September 24, 2009
    Applicant: Baker Hughes Incorporated
    Inventors: Terry J. Koltermann, Aaron J. Dick
  • Patent number: 7464773
    Abstract: A lubricating nutating single cone drill bit 10 includes bit shank 12 with an axially skewed journal 18 rotatably retaining cutter body 22. Bearings (26, 28, 30, 32) enable rotation of the cutter body 22. Lubrication flows to a gap between the axially skewed journal 18 and cutter body 22 from lubricant chamber 76 having plunger 80 acted on by an annulus fluid, the gap bounded by first 66 and second 68 radial dynamic seals. A fluid passage 90 extending through the bit 10 communicates with fluid inlet port 88 on the proximal end 16 of the bit shank 12. Fluid passage 90 also communicates with a first fluid outlet port 98 on the distal end 36 of the axially skewed journal 18 and with a second fluid outlet port 94 formed on a lateral portion of bit shank 12.
    Type: Grant
    Filed: August 18, 2006
    Date of Patent: December 16, 2008
    Inventor: Allen Kent Rives
  • Patent number: 7445062
    Abstract: An arrangement for replenishing lubricating grease in drill cutters (3) that include a conical outer barrel (7) which is rotatable about a shaft (5) disposed centrally in the cutter, wherein there is provided in the cutter shaft (5) a passageway (16) that extends along the shaft from the cutter end of largest diameter and that connects with a transverse passageway (18) which opens into a bearing-accommodating space (13) in the cutter for delivering lubricating grease to the space (13), and wherein a lubricating nipple (19) is provided on the cutter end wall of largest diameter and functions to allow lubricating grease to be released from the bearing-accommodating space (13).
    Type: Grant
    Filed: September 14, 2007
    Date of Patent: November 4, 2008
    Assignee: Atalas Copco Secoroc AB
    Inventors: Jonas Thuresson, Lars Holmgren
  • Patent number: 7267183
    Abstract: A high-temperature lubricant is shown and described. The lubricant includes a base stock and about 1 to about 20 weight percent zirconium 2-ethylhexanoate. The lubricant may also include about 1 to about 9 weight percent bismuth 2-ethylhexanoate.
    Type: Grant
    Filed: May 16, 2005
    Date of Patent: September 11, 2007
    Assignee: Smith International, Inc.
    Inventors: Robert Denton, Alan W. Lockstedt, Alysia C. White
  • Patent number: 7121365
    Abstract: A lubricating grease is specific for a rock bit for drilling subterranean formations. The rock bit body includes a plurality of journal pins, each having a bearing surface, with a cutter cone mounted on each journal pin and also including a bearing surface. A grease reservoir provides lubricating grease to such bearing surfaces. The grease composition adjacent the bearing surfaces comprises a lubricating base oil, sufficient thickener and additives in the base oil to form a rock bit grease, and an effective amount of polarized graphite.
    Type: Grant
    Filed: December 23, 2003
    Date of Patent: October 17, 2006
    Assignee: Smith International, Inc.
    Inventors: Robert M. Denton, Alan W. Lockstedt
  • Patent number: 6698536
    Abstract: A roller cone drill bit is disclosed which includes at least one roller cone rotatably mounted to a bit body. The bit body includes therein a lubricant reservoir adapted to supply lubricant to bearings on which the roller cone rotates about the bit body. The bit includes a sensor adapted to detect drilling fluid contamination of the lubricant. The bit includes a processor/transmitter operatively coupled to the sensor and adapted to communicate signals corresponding to detected contamination.
    Type: Grant
    Filed: February 20, 2002
    Date of Patent: March 2, 2004
    Assignee: Smith International, Inc.
    Inventors: David P. Moran, Gary R. Portwood
  • Patent number: 6695079
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and a conduit for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Grant
    Filed: March 18, 2002
    Date of Patent: February 24, 2004
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Patent number: 6679342
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and a conduit for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Grant
    Filed: August 7, 2002
    Date of Patent: January 20, 2004
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert Denton, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau
  • Publication number: 20030116357
    Abstract: A drill bit has a plurality of air tubes extending into the bowl for separating entrained debris and liquids from air flow used to clean and cool bearings in the cutters of the bit. The air tube is assembled from a tube and a cap. The tube has open ends and a plurality of openings through the sidewall of the tube for allowing air to flow through the openings while preventing large debris from entering the tube. The lower end of the tube is inserted into an inner portion of a fluid passage, and the cap is secured to the upper end of the tube. The cap is removable for providing access to the interior of the tube when necessary to dislodge debris from within the tube.
    Type: Application
    Filed: December 21, 2001
    Publication date: June 26, 2003
    Inventors: Gregory W. Peterson, Samuel B. Davis
  • Publication number: 20030062197
    Abstract: A roller cone drill bit is disclosed which includes at least one roller cone rotatably mounted to a bit body. The bit body includes therein a lubricant reservoir adapted to supply lubricant to bearings on which the roller cone rotates about the bit body. The bit includes a sensor adapted to detect drilling fluid contamination of the lubricant. The bit includes a processor/transmitter operatively coupled to the sensor and adapted to communicate signals corresponding to detected contamination.
    Type: Application
    Filed: February 20, 2002
    Publication date: April 3, 2003
    Inventors: David P. Moran, Gary R. Portwood
  • Publication number: 20030019666
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and means for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space.
    Type: Application
    Filed: August 7, 2002
    Publication date: January 30, 2003
    Applicant: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert Denton, Robert H. Slaughter, Roger Didericksen, Peter Cariveau
  • Patent number: 6431293
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone and an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole. An annular space is defined between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity. The seals are configured to allow the passage of a fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for fluid from the borehole to the annular space can be included.
    Type: Grant
    Filed: October 13, 2000
    Date of Patent: August 13, 2002
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Patent number: 6405811
    Abstract: A solid lubricant is added to the internal passages of an air cooled bit such that the air erodes, or ablates, the solid lubricant into the air stream. Compressed air travels down the drill stem to the bit. The air passes through an air tube into the main air passage where the solid lubricant has been placed. As the air passes the solid lubricant, it erodes the solid lubricant. The solid lubricant particles ablated into the air stream travel through the ball passage into the journal air passage and out to the bearing surfaces between the cutter and the journal. The air stream both cools the surfaces and deposits the solid lubricant to reduce the friction between the bearing surfaces.
    Type: Grant
    Filed: September 18, 2000
    Date of Patent: June 18, 2002
    Assignee: Baker Hughes Corporation
    Inventor: Ed G. Borchardt
  • Publication number: 20020046884
    Abstract: A sealing structure for a rock drill bit includes an elastomeric diaphragm for installation in the drill bit so as to separate grease from drilling mud. The diaphragm has an aperture extending through it, and a plug is disposed in the aperture so as to form a mechanical seal with a wall of the aperture. The plug has a channel therethrough which is normally held sealed by a face of the aperture in the diaphragm. If the pressure of the grease exceeds pressure in mud on the other side of the diaphragm by more than a critical value, the diaphragm aperture deforms and allows grease to move through the plug channel and escape. The critical value can be varied by using, with the same diaphragm, plugs having different numbers, sizes and axial positions of plug channels.
    Type: Application
    Filed: July 25, 2001
    Publication date: April 25, 2002
    Inventors: Nigel M. Page, Philip D. Embury
  • Publication number: 20010054514
    Abstract: A drill bit for use in drilling operations in a wellbore, the drill bit having a bit body including a plurality of bit legs, each supporting a rolling cone cutter; a coupling member formed at an upper portion of said bit body; at least one temperature sensor for monitoring at least one temperature condition of said improved drill bit during drilling operations; and at least one temperature sensor cavity formed in said bit body and adapted for receiving, carrying, and locating said at least one temperature sensor in a particular position relative to said bit body which is empirically determined to optimize temperature sensor discrimination.
    Type: Application
    Filed: February 6, 2001
    Publication date: December 27, 2001
    Applicant: Baker Hughes Incorporated
    Inventors: Eric Charles Sullivan, Theodore Edward Zaleski, Scott Ray Schmidt, Don Quy Nguyen, Glenn R. Zadrapa, Chih Lin
  • Patent number: 6296067
    Abstract: A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and the leg on which it is supported, and a lubricant reservoir in fluid communication with the bearing system. The reservoir can be provided with a wear resistant plug, if desired. In the present bit, the reservoir has at least one opening positioned in either the leg's leading surface, trailing surface, center surface, shoulder surface or some combination of these. Alternatively, the reservoir can be formed inside the bit body, preferably by means of a canister, which can be provided with venting means as desired.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: October 2, 2001
    Assignee: Smith International, Inc.
    Inventors: Robert H. Slaughter, Jr., Peter T. Cariveau, Kirk A. Norris, Roger Didericksen, William M. Conn
  • Patent number: 6206110
    Abstract: A rotary cone rock bit, comprises a bit body including a plurality of legs extending therefrom, each of the legs having an outer surface that includes a leading surface and a trailing surface, a roller cone rotatably supported on each of the legs, a bearing system between each cone and the leg on which it is supported, and a lubricant reservoir in fluid communication with the bearing system. The reservoir can be provided with a wear resistant plug, if desired. In the present bit, the reservoir can be pressured-balanced with fluid in the bit plenum or the borehole annulus, or maintained at some desired differential with respect to either of these. Alternatively, the reservoir can be formed inside the bit body, preferably by means of a canister, which can be provided with venting means as desired.
    Type: Grant
    Filed: January 18, 2000
    Date of Patent: March 27, 2001
    Assignee: Smith International, Inc.
    Inventors: Robert H. Slaughter, Jr., Peter T. Cariveau, Kirk A. Norris, Roger Didericksen, William M. Conn
  • Patent number: 6196339
    Abstract: A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone and an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole. An annular space is defined between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity. The seals are configured to allow the passage of a fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and a passage for fluid from the borehole to the annular space can be included.
    Type: Grant
    Filed: November 30, 1998
    Date of Patent: March 6, 2001
    Assignee: Smith International, Inc.
    Inventors: Gary Ray Portwood, Chris Edward Cawthorne, Robert H. Slaughter, Jr., Roger Didericksen, Peter Cariveau, Robert Denton
  • Patent number: 6092611
    Abstract: A relief valve for use in roller cone drilling bits of the sealed bearing type and other types of sealed fluid systems. The relief valve includes a valve body arranged to fit into the lubricating system of the bit and an elastomeric valve member having a flow port therein that is normally closed. The valve member includes a flexible lip defining the port that is arranged to permit flow in one direction through the port to relieve pressure above a predetermined value while preventing flow therethrough in the opposite direction.
    Type: Grant
    Filed: May 18, 1998
    Date of Patent: July 25, 2000
    Assignee: Dresser Industries, Inc.
    Inventor: William C. Saxman
  • Patent number: 6056072
    Abstract: A heavy-duty lubricating grease is shown which includes a synthetic fluid base and a thickener system. The heavy-duty grease can be used in both rolling element and journal type rock bit bearings to drill in heavy-duty, high temperature applications, such as in the bearing structures of rock bits used to drill hot subterranean formations.
    Type: Grant
    Filed: November 2, 1998
    Date of Patent: May 2, 2000
    Assignee: Baker Hughes Inc.
    Inventors: Terry J. Koltermann, Thomas F. Willey
  • Patent number: 5984024
    Abstract: The present invention relates to a cutter for a raise boring head. The cutter is rotatable about a center axis and mounted, via a shaft of the cutter, in a saddle secured to the raise boring head. The shaft has ends that are secured to the saddle by a fastening mechanism. Bearings are provided between the shaft and a hub of the cutter in order to make it possible for the hub to rotate relative to the shaft. Seals are provided between the shaft and the hub, and the bore which is provided for introducing lubrication into the interior of the cutter. An expansion plug is mounted in the bore. The expansion plug is designed to accommodate the lubrication that enters into the bore from the bearings. A stopper is provided in the bore. The stopper encases a part of the fastening mechanism and is arranged to prevent mud from entering the orifice of the bore.
    Type: Grant
    Filed: April 22, 1998
    Date of Patent: November 16, 1999
    Assignee: Sandvik AB
    Inventor: Goran Strand
  • Patent number: 5931241
    Abstract: A rolling cutter drill bit comprises a main body and three depending legs, each leg having a cantilevered bearing spindle on which a rolling cutter is rotatably mounted. Bearings located between the cutter and spindle include a radial bearing, and a thrust bearing configured to carry onward thrust loads from the cutter onto the spindle. A bearing seal defines an enclosed region between the cutter and the spindle in which the bearings are located, and a pressure balanced lubricant delivery system within the spindle delivers lubricant to the bearings. The lubricant delivery system includes a non-return valve to allow lubricant to flow into the area of the enclosed region containing the thrust bearing and the area is bounded by a tortuous flow path which allows a more restricted flow of lubricant out of the thrust bearing area and into another area of the enclosed region, without pressurizing the bearing seal.
    Type: Grant
    Filed: January 10, 1997
    Date of Patent: August 3, 1999
    Assignee: Camco International Inc.
    Inventor: Jeffery E. Daly
  • Patent number: 5891830
    Abstract: A heavy-duty lubricating grease is shown which includes a synthetic fluid base and a thickener system. The heavy-duty grease can be used in both rolling element and journal type rock bit bearings to drill in heavy-duty, high temperature applications, such as in the bearing structures of rock bits used to drill hot subterranean formations.
    Type: Grant
    Filed: January 31, 1997
    Date of Patent: April 6, 1999
    Assignee: Baker Hughes Incorporated
    Inventors: Terry J. Koltermann, Thomas F. Willey
  • Patent number: 5791421
    Abstract: An earth-boring bit has a bit body, at least one cantilevered bearing shaft, including a base and a cylindrical journal bearing surface extending inwardly and downwardly from the bit body, and at least one cutter mounted for rotation on the cylindrical journal bearing surface of the bearing shaft. A seal assembly is disposed between the cylindrical journal bearing surface and the cutter proximally to the base of the cantilevered bearing shaft. The seal assembly includes at least one rigid seal ring having a seal face in contact with a second seal face. A selected one of the seal faces is at least partially formed of a hard ceramic type material with the other seal face being formed of a relatively softer material to provide improved wear resistance for the seal assembly.
    Type: Grant
    Filed: August 6, 1996
    Date of Patent: August 11, 1998
    Assignee: Baker Hughes Incorporated
    Inventor: Chih Lin
  • Patent number: 5628375
    Abstract: A rolling cutter drill bit comprises a main body and three depending legs, each leg having a cantilevered bearing spindle on which a rolling cutter is rotatably mounted. Bearings located between the cutter and spindle include a radial bearing, and a thrust bearing configured to carry onward thrust loads from the cutter onto the spindle. A bearing seal defines an enclosed region between the cutter and the spindle in which the bearings are located, and a pressure balanced lubricant delivery system within the spindle delivers lubricant to the bearings. The lubricant delivery system includes a non-return valve to allow lubricant to flow into the area of the enclosed region containing the thrust bearing and the area is bounded by a tortuous flow path which allows a more restricted flow of lubricant out of the thrust bearing area and into another area of the enclosed region, without pressurizing the bearing seal.
    Type: Grant
    Filed: August 29, 1995
    Date of Patent: May 13, 1997
    Assignee: Camco International Inc.
    Inventor: Jeffery E. Daly
  • Patent number: 5589443
    Abstract: A rock bit grease composition is prepared by combining synthetic polymer lubricant basestocks comprising a first ethylene-alphaolefin polymer having an average molecular weight in the range of from 3,500 to 4,000, and a polyisobutylene polymer to form a first master. A metal complex soap base thickener is prepared by combining a synthetic polymer lubricant basestocks comprising a second ethylene-alphaolefin having an average molecular weight in the range of from 400 to 800, with an alkali-metal or alkaline-earth metal hydroxide, and at least one fatty acid. A preferred fatty acid is a blend of a first fatty acid having in the range of from 15 to 20 carbon atoms, and a second fatty acid having in the range of from 5 to 12 carbon atoms. The first master and metal complex soap base thickener are mixed together in desired proportions.
    Type: Grant
    Filed: December 21, 1995
    Date of Patent: December 31, 1996
    Assignee: Smith International, Inc.
    Inventors: Robert M. Denton, Zhigang Fang
  • Patent number: 5520257
    Abstract: A shaft boring bit has a bit body with at least one saddle member secured to the bit body. The saddle receives and supports the ends of a journal member. A cutter is mounted for rotation on the journal member and an anti-friction bearing is disposed between the cutter and the journal and secures the cutter on the journal member. Seal means are provided between the cutter and the journal member to retain lubricant in the anti-friction bearing. A bearing loading passage is formed in the journal member for loading at least a portion of the anti-friction bearing between the cutter and the journal member. A lubricant compensator assembly is removably disposed in a lubricant compensator recess formed at one end of the journal. The lubricant compensator is in fluid communication with the anti-friction bearing and includes a rigid ball plug member, which obstructs the bearing loading passage and abuts the portion of the anti-friction bearing to retain the bearing between the cutter and journal.
    Type: Grant
    Filed: December 5, 1994
    Date of Patent: May 28, 1996
    Assignee: Baker Hughes Incorporated
    Inventor: Kay M. Crews
  • Patent number: 5477934
    Abstract: A cutter mounted on a boring head includes a shaft and a roller body rotatably mounted thereon The greasing of bearings disposed between the roller body and shaft is achieved through an axial bore formed in the shaft and into which a filling plug is inserted. Grease is pumped through the filling plug and into channels in which the bearings are disposed. The filling plug is then removed, leaving the bore essentially grease-free. To prevent the escape of grease from the passage during a cutting operation, while accommodating thermal expansion of the grease, a grease retainer plug is secured in the passage. The retainer plug forms a space which communicates with the bearings for receiving thermally expanding grease. If the volume of expanded grease exceeds the volume of that space, the grease passes through a pressure relief valve and displaces a cover of the valve to create another space of gradually expanding volume for receiving the grease.
    Type: Grant
    Filed: September 21, 1994
    Date of Patent: December 26, 1995
    Assignee: Sandvik AB
    Inventor: Goran Strand
  • Patent number: 5439068
    Abstract: A rotary cone drill bit for forming a borehole having a one-piece bit body with a lower portion having a convex exterior surface and an upper portion adapted for connection to a drill string. The drill bit will generally rotate around a central axis of the bit body. A number of support arms are preferably attached to pockets formed in the bit body and depend therefrom. Each support arm has an inside surface with a spindle connected thereto and an outer surface. Each spindle projects generally downwardly and inwardly with respect to the longitudinal axis of the associated support arm and the central axis of the bit body. A number of cone cutter assemblies equal to the number of support arms are mounted respectively on each of the spindles. The spacing between each of the support arms along with their respective length and width dimensions are selected to enhance fluid flow between the cutter cone assemblies mounted on the respective support arms and the lower portion of the bit body.
    Type: Grant
    Filed: August 8, 1994
    Date of Patent: August 8, 1995
    Assignee: Dresser Industries, Inc.
    Inventors: Alan D. Huffstutler, Wesley P. Dietz
  • Patent number: 5015401
    Abstract: A heavy duty lubricating grease as shown which includes a multi-purpose heavy duty hydrocarbonaceous lubricant thickened by an alkaline soap to form a lubricating grease, molybdenum disulfide and powdered calcium fluoride. The heavy duty grease can be used in a journal bearing of a drill bit in heavy duty, high temperature applications, such as journal bearings on its used to drill hot subterranean formations.
    Type: Grant
    Filed: October 16, 1990
    Date of Patent: May 14, 1991
    Assignee: Hughes Tool Company
    Inventors: David K. Landry, Terry J. Koltermann
  • Patent number: 4981182
    Abstract: A sealed rotary drill bit has a plurality of leg members, with each leg member having a projecting conical cutter receiving journal. A conical cutter has friction reducing bearings interior to the conical cutter for rotatably mounting the cutter on the respective journal. A sealing arrangement retains lubricant for the bearings. A circumferential porous gas restrictor is positioned concentric with and spaced outwardly from the sealing arrangement to form an annular gas chamber therebetween. Pressurized gas is carried by passageways into the annular gas chamber. The porous gas restrictor, which can be formed of metal particles bonded together, prevents drilling debris from getting past it, but the porosity of the restrictor allows pressurized gas to pass therethrough as a controlled dissipation and wash away drilling debris, thereby shielding the sealing arrangement from debris that might otherwise reach the sealing arrangement.
    Type: Grant
    Filed: January 26, 1990
    Date of Patent: January 1, 1991
    Assignee: Dresser Industries, Inc.
    Inventor: Theodore R. Dysart
  • Patent number: 4865136
    Abstract: A one-way pressure relief valve assembly is provided for venting the lubricant reservoir of a roller-type well drilling bit. The valve assembly is mounted in the cap of the lubricant reservoir, to open outwardly, and is adapted to provide hydrostatic loading of the valve element to its closed position.
    Type: Grant
    Filed: October 5, 1987
    Date of Patent: September 12, 1989
    Assignee: Cummins Engine Company
    Inventor: James E. White
  • Patent number: 4749053
    Abstract: A roller cutter drill bit adapted to drill bores in the earth comprising a bit body of steel having a plurality of bearing journals at its lower end, and a plurality of roller cutters, each having a recess therein receiving one of the journals. A radial bearing asembly for each roller cutter rotatably mounts the roller cutter on the journal, and an axial or thrust bearing assembly at the free end of each journal carries axial forces applied to the roller cutter during drilling, with the thrust bearing assembly thus being subject to rotary frictional forces and heating upon rotation of the drill bit during drilling. According to this invention, a heat dissipation member formed of material having higher thermal conductivity than steel is incorporated into the bit body. This material extends from the free end toward the attached end of the journal for conducting heat away from the thrust bearing assembly, thereby reducing bearing temperatures and providing longer bearing life.
    Type: Grant
    Filed: February 24, 1986
    Date of Patent: June 7, 1988
    Assignee: Baker International Corporation
    Inventor: Frank A. Hollingshead
  • Patent number: 4678045
    Abstract: A drill string is made flexible near the lower marginal end thereof, and a pneumatic turbine motor is located at the lower terminal end thereof. The pneumatic turbine is connected to a planetary gear reduction system for rotating a drill bit. The diameter and the length of the pneumatic turbine motor, gear reduction system, and bit is of a size which enables the entire assembly to negotiate a sharp bend in the borehole, so that the borehole can be formed to extend downwardly along a relatively straight vertical line towards a payzone, where the borehole then sharply bends laterally towards the payzone, and then continues in another relatively straight line horizontally through the payzone. The pneumatic turbine motor includes reaction ports arranged to force the drill bit against the formation being penetrated, and to counteract the bit torque.
    Type: Grant
    Filed: October 8, 1985
    Date of Patent: July 7, 1987
    Inventor: William C. Lyons
  • Patent number: 4591008
    Abstract: This invention discloses a method to protect the lubrication reservoir system for sealed bearing rotary cone rock bits. A multiplicity of flush-type tungsten carbide inserts are positioned in each leg of the rock bit surrounding the lubrication reservoir cover cap. The inserts prevent erosion of the leg around the cover cap, thus protecting the snap ring that secures the cover cap within the reservoir chamber.
    Type: Grant
    Filed: August 22, 1984
    Date of Patent: May 27, 1986
    Assignee: Smith International, Inc.
    Inventor: Michael S. Oliver