With Releasable Means To Detachably Retain Telescoping Members Against Axial Reciprocation Patents (Class 175/300)
  • Patent number: 9151813
    Abstract: Re-usable ceramic magic angle spinning (MAS) NMR rotors constructed of high-mechanic strength ceramics are detailed that include a sample compartment that maintains high pressures up to at least about 200 atmospheres (atm) and high temperatures up to about least about 300° C. during operation. The rotor designs minimize pressure losses stemming from penetration over an extended period of time. The present invention makes possible a variety of in-situ high pressure, high temperature MAS NMR experiments not previously achieved in the prior art.
    Type: Grant
    Filed: August 7, 2013
    Date of Patent: October 6, 2015
    Assignee: BATTELLE MEMORIAL INSTITUTE
    Inventors: Jian Zhi Hu, Mary Y. Hu, Mark R. Townsend, Johannes A. Lercher, Charles H. F. Peden
  • Publication number: 20130319772
    Abstract: A hammer bit retainer system includes a hammer bit locking mechanism arranged and designed to prevent decoupling of a driver sub from a hammer casing. The hammer bit locking mechanism includes an expandable split ring which is disposed in the coupling between the driver sub and hammer casing. The hammer bit locking mechanism prevents axial movement of the driver sub relative to the hammer casing in at least one direction.
    Type: Application
    Filed: June 3, 2013
    Publication date: December 5, 2013
    Inventors: Lokesh BHATIA, Jose F. HURTADO
  • Patent number: 8505653
    Abstract: A double-acting compounder comprises: an outer housing; an inner mandrel disposed telescopically within the outer housing to define a fluid chamber; an equalizer, such as an equalizer piston, between the fluid chamber and an exterior of the outer housing for equalizing pressure; a movable seal assembly within the fluid chamber with a first end defining an end of the fluid chamber; the inner mandrel having an outer shoulder for moving the movable seal assembly with the inner mandrel when the inner mandrel moves in a first direction relative to the outer housing to compresses fluid within the fluid chamber; and the outer housing having an inner shoulder for preventing the movable seal assembly from moving with the inner mandrel when the inner mandrel moves in a second direction relative to the outer housing to compresses fluid within the fluid chamber.
    Type: Grant
    Filed: April 1, 2010
    Date of Patent: August 13, 2013
    Assignee: Lee Oilfield Service Ltd.
    Inventors: Michael Shoyhetman, David Budney, Craig Budney, Glenn Budney
  • Patent number: 8302708
    Abstract: A drill wrench for driving drill steels, drill bits, and bolts during drilling and bolting operations is disclosed. The drill wrench may include an internal driver for driving a drill steel. The internal driver may be inserted in an internal-drive recess defined within an end of the drill steel. When the drill wrench is rotated, the internal driver may drive the drill steel by engaging at least one surface within the end of the drill steel. The drill wrench may also include an external support member that supports the drill steel during drilling. The external support member may also drive the drill steel by engaging an outer peripheral portion of the drill steel when the drill wrench is rotated.
    Type: Grant
    Filed: May 12, 2009
    Date of Patent: November 6, 2012
    Assignee: Dover BMCS Acquisition Corporation
    Inventors: E. Sean Cox, Russell Roy Myers
  • Patent number: 8100200
    Abstract: A chuck assembly, an assembly for an earth-boring drill assembly, and a method of retaining a drill bit for an earth-boring drill assembly, the drill assembly including a casing. The assembly includes a drill bit having a generally cylindrical head, a chuck connectable to the casing and operable to support the bit, the chuck having an outer surface with a radially-outwardly extending chuck ridge, an axially-extending first slot being defined in the ridge, a sleeve having an inner surface with a radially-inwardly extending sleeve ridge engageable with the chuck ridge to limit axial movement of the sleeve relative to the chuck, the sleeve having a first lug supported on the inner surface, the first lug being positionable in the first slot to limit relative rotational movement between the sleeve and the chuck. The assembly may also include a retainer assembly provided between the sleeve and the bit.
    Type: Grant
    Filed: November 19, 2009
    Date of Patent: January 24, 2012
    Assignee: Atlas Copco Secoroc LLC
    Inventor: Dale Richard Wolfer
  • Patent number: 7325631
    Abstract: A downhole mill includes a plurality of cutters extending generally radially from a center region to a gage diameter, wherein the plurality of cutters includes a first serrated cutter blade having a plurality of peaks and valleys along its length. The plurality of cutters includes a second serrated cutter blade having a plurality of peaks and valleys along its length. The plurality of cutters includes a non-serrated cutter blade positioned upon the cutting face between the first serrated cutter blade and the second serrated cutter blade, wherein the peaks of the first serrated cutter blade is radially aligned with the valleys of the second serrated cutter blade. A pump-off sub configured to release a downhole mill includes a dovetail connection maintained by a c-ring in an expanded state.
    Type: Grant
    Filed: July 29, 2005
    Date of Patent: February 5, 2008
    Assignee: Smith International, Inc.
    Inventors: William M. Roberts, Tracy R. Speer
  • Patent number: 7299885
    Abstract: A method and apparatus for allowing a downhole drill string to be stuck at one location and continue to rotate above the stuck section. The apparatus provides a method for collapsing the stuck subassembly by reducing its outside diameter. Simultaneous with the subassembly collapse, a jarring action is initiated from within the drill string to further loosen the stuck sections. At the same time drilling fluid inside the string is allowed to circulate outside the string through a circulation sub. The fluid is forced around the stuck subassembly further increasing the likelihood that the subassembly will be freed.
    Type: Grant
    Filed: July 10, 2003
    Date of Patent: November 27, 2007
    Inventor: Jeffery D. Baird
  • Patent number: 6827162
    Abstract: The present invention relates to a downhole-hammer drill-bit assembly for removable attachment to a substantially tubular casing of a downhole hammer. The drill-bit assembly has a substantially tubular chuck, a drill-bit, and a substantially tubular retainer. The chuck has a step. The drill-bit has a bit shank, a bit shoulder extending from the shank and a bit head. A 6first portion of the bit shank is in a bore of the chuck. The retainer has a split retainer sidewall, a first end and a second end. The first end has a split retainer collar. The second end has a split retainer ring. The split retainer sidewall is around a portion of the chuck and the bit shoulder. The split retainer collar is around a first surface of the step. The split retainer ring is around a portion of the bit shank between the bit shoulder and the bit head.
    Type: Grant
    Filed: October 30, 2002
    Date of Patent: December 7, 2004
    Assignee: Center Rock, Inc.
    Inventor: Brandon W. Fisher
  • Patent number: 6810974
    Abstract: A retainer device (10) is provided for retaining a drill bit (12) within a percussive drill assembly casing (2). The retainer device (10) includes a generally annular body (16) having a central axis and an inner circumferential shoulder portion (18) disposable within the casing (2) such that the body axis (17) is substantially collinear with a casing axis (2a). The shoulder (17) is deflectable between a first position (P1), where the shoulder (18) is contactable with the bit head (14) to retain the bit (12) within the retainer body (16), and a second position (P2). The second position (P2) is spaced radially outwardly from the first position such that the bit head (14) is displaceable through the body (16) in a direction along the casing axis (2a). Also, the retainer device (10) includes a spacer (24) that locates the retainer body (16) at a desired axial position within the casing (2) and a centralizer (26) that centers the body (16) about the casing axis (2a).
    Type: Grant
    Filed: March 20, 2003
    Date of Patent: November 2, 2004
    Assignee: Atlas Copco AB
    Inventors: Leland H. Lyon, Richard K. Smith, Jr.
  • Patent number: 6789632
    Abstract: A rock drilling apparatus includes a drill string terminating in a drill chuck (32) and a drill bit (16) detachably fitted into the drill chuck, the drill bit having a shank (18) received in the drill chuck, the drill chuck (32) and the drill bit shank (18) having complementary splines and grooves allowing rotation or movement of the drill chuck to be transmitted to the drill bit whilst allowing limited longitudinal movement of the drill chuck relative to the drill bit. The drill bit has a drill head (22) at its lower end which is of greater diameter than said shank, said head having a part (26) above that lower end and below the splined region.
    Type: Grant
    Filed: February 27, 2003
    Date of Patent: September 14, 2004
    Assignee: Halco Drilling International Limited
    Inventor: Christopher J. Green
  • Patent number: 6698537
    Abstract: A bit retainer for a percussion bit assembly has a bore and upper and lower lips extending into the bore. Multiple slots extend from the lower end of the retainer member to a terminal end disposed intermediate the upper and lower ends, forming multiple cantilever beam segments. The cantilever beam segments are resiliently, radially deflected by the retention shoulder of the percussion bit to mount and retain the bit.
    Type: Grant
    Filed: December 5, 2001
    Date of Patent: March 2, 2004
    Assignee: Numa Tool Company
    Inventors: Jack H. Pascale, Dennis J. Dugas
  • Publication number: 20030116358
    Abstract: A stabilizing sleeve device for an impact drill bit used in underground drilling operations. The cylindrical tubular device has arcuate keys on a bottom edge for interlocking with keyways in the shoulder of a hammer drill bit and a locking key groove in its top edge.
    Type: Application
    Filed: February 7, 2003
    Publication date: June 26, 2003
    Inventor: Cody H. Rogers
  • Patent number: 6516903
    Abstract: A stabilizing sleeve device for an impact drill bit used in underground drilling operations. The cylindrical tubular device has arcuate keys on a bottom edge for interlocking with keyways in the shoulder of a hammer drill bit and a locking key groove in its top edge.
    Type: Grant
    Filed: December 20, 2000
    Date of Patent: February 11, 2003
    Assignee: Weatherford/Lamb, Inc.
    Inventor: Cody H. Rogers
  • Patent number: 6308940
    Abstract: A rotary and longitudinal shock absorbing apparatus with an mandrel therein is connected to a drill string assembly to absorb abnormal longitudinal shocks and abnormal torsional shocks by cooperating hydraulic and mechanical means, while allowing communication of drilling fluid through the body of the apparatus. The construction of the apparatus is such that torque shock absorbing action is independent of the longitudinal shock absorbing action and the apparatus provides balanced internal and external pressure to permit its operation at all levels of hydraulic pressure.
    Type: Grant
    Filed: September 11, 1999
    Date of Patent: October 30, 2001
    Assignee: Smith International, Inc.
    Inventor: Edwin A. Anderson
  • Patent number: 6182776
    Abstract: Overburden drilling equipment for drilling a hole includes a down-the-hole hammer formed by a cylinder and a piston reciprocating in the cylinder due to pressurized water being directed alternately to the upper and lower ends of the piston. Each downward stroke inflicts an impact blow upon an anvil portion of a drill bit extending upwardly within the lower portion of the cylinder. A drill chuck is mounted at a lower end of the cylinder to receive the drill bit. A generally cylindrical casing shoe is attached to a casing and is rotatably connected to the drill bit to be longitudinally advanced thereby during drilling operation. The drill chuck includes at least one key which defines the largest radius of the drill chuck. The casing includes a diametrically reduced portion which has at least one keyway therein. The key and the diametrically reduced portion retain the hammer longitudinally in relation to the drill bit.
    Type: Grant
    Filed: June 7, 1999
    Date of Patent: February 6, 2001
    Assignee: Sandvik AB
    Inventor: Bengt Åsberg
  • Patent number: 6070678
    Abstract: A substantially tubular retainer member is provided, having a bore of substantially uniform internal diameter which can slip over the retention shoulder of the percussion bit, whether that shoulder is solid or threaded. Pins are then driven through holes in the retainer, under the retention shoulder. The pins retain the head of the bit in the event of bit breakage.
    Type: Grant
    Filed: May 1, 1998
    Date of Patent: June 6, 2000
    Assignee: Numa Tool Company
    Inventor: Jack H. Pascale
  • Patent number: 5647447
    Abstract: A bit retention device for a bit and chuck assembly of a down-the-hole, percussive drill, for retaining a head section of a bit should the head section separate from a shank of the bit includes a chuck adapted for threadable connection to a drill casing, a drill bit, a bit retaining shoulder in the the assembly; a wear collar concentric about the chuck and bit and a flexible retaining member removably connected to the assembly, the retaining member extending radially between the wear collar and bit a sufficient distance to contact the retaining shoulder should the bit drop axially downwardly.
    Type: Grant
    Filed: June 10, 1996
    Date of Patent: July 15, 1997
    Assignee: Ingersoll-Rand Company
    Inventor: William Leslie Jones
  • Patent number: 5425430
    Abstract: There is disclosed a tool for enhancing the impact delivered to an object stuck in a well bore by means of a jar having a first tubular member connected to the object and a second tubular member having a hammer arranged to deliver an upward blow to an anvil on the first member in response to raising and a downward blow in response to lowering of the second tubular mandrel member with respect to the first member, the tool comprising a first tubular member having a lower end adapted to be connected to the second tubular member of the jar for raising and lowering therewith, a second tubular member vertically reciprocable with respect to the first member to form on annular space between them and having an upper end adapted to be connected to a well pipe string above it, and first and second sets of upper and lower longitudinally spaced seal rings within the annular space and sealably slidable with respect to equal diameter portions of each of the tubular members to form upper and lower fluid chambers between the
    Type: Grant
    Filed: January 27, 1994
    Date of Patent: June 20, 1995
    Assignee: Houston Engineers, Inc.
    Inventor: Billy J. Roberts
  • Patent number: 5318139
    Abstract: A reduce waiting time drilling jar 1 includes a mandrel 2, a housing 3 telescopingly positioned about the mandrel 2, and first and second pistons 89, 111 positioned axially between the mandrel 2 and the housing 3. The pistons 89, 111 are spaced longitudinally apart, forming a substantially sealed chamber 88 therebetween. The first piston 89 has a first and second substantially parallel flow passage 94, 200 formed therein and extending longitudinally therethrough to provide first and second flow characteristics. A valve 204 is hydraulically connected to the second flow passage 200. The valve 204 is translatable between first and second operating positions, wherein fluid flows relatively freely through the second flow passage 200 in the first operating position, but is restricted in the second operating position.
    Type: Grant
    Filed: April 29, 1993
    Date of Patent: June 7, 1994
    Inventor: Robert W. Evans
  • Patent number: 5086853
    Abstract: A double acting hydraulic drilling jar 1 includes a mandrel 2 arranged in a housing 3 for sliding longitudinal movement. A hammer 69 is positioned on the mandrel 2 and interacts with anvil surfaces 64, 66 in the housing 3 to deliver both upward and downward jarring forces to a drill string. A hydraulic valve arrangement permits the storage of large amounts of static force before releasing the hammer 69 to strike the anvil surfaces with great force. The hydraulic valve arrangement includes a tripping valve 95 positioned to be actuated by a first pair of engaging surfaces in response to downward movement of the mandrel 2 in the housing 3 and a second pair of engaging surfaces in response to upward movement of the mandrel 2 in the housing 3. Thus, independent control over the upward and downward jarring action is achieved.
    Type: Grant
    Filed: March 15, 1991
    Date of Patent: February 11, 1992
    Inventor: Robert W. Evans
  • Patent number: 4903785
    Abstract: A drilling and chiseling tool bit includes a tool bit head, an axially extending shank and an insertion end for insertion into a drilling or chiseling device. The shank extends between the tool bit head and the insertion end and is divided into individual axially aligned members. The individual shank members are held together by a retaining member which also interconnects the tool bit head and the insertion end. The tool bit head and insertion end are rotatable as a unit and are movable axially relative to one another. By dividing the shank axially, its individual members have a higher natural frequency and afford improved transmission of impact energy. As a result, preventing the excitation of natural vibrations in individual shank members, the vibration period is shorter compared to the impact transmission time period. Accordingly, the sound radiation from the tool bit is reduced.
    Type: Grant
    Filed: December 23, 1988
    Date of Patent: February 27, 1990
    Assignee: Hilti Aktiengesellschaft
    Inventors: Walter Odoni, Oliver Berchtold, Wilhelm Gerber
  • Patent number: 4846273
    Abstract: An energy accumulator for use with a well pipe string to enhance the jarring impact delivered to an object stuck in a well bore by an up and/or down jar mechanism includes inner and outer telescopically connected members relatively movable longitudinally to accumulate energy in a mechanical spring arrangement, gas or compressible liquid in the accumulator. Cooperating surfaces on the inner and outer members of the energy accumulator assure that the jarring impact of the jar mechanism members is delivered to the stuck independently of the tensile or compressive load applied to the object jar mechanism and independently of the load rate of accumulating energy in the energy accumulator.
    Type: Grant
    Filed: September 21, 1987
    Date of Patent: July 11, 1989
    Inventors: Edwin A. Anderson, Derrel D. Webb
  • Patent number: 4694917
    Abstract: A jarring device for use in drilling comprises first and second members longitudinally relatively movable between a locked position and a released position said device comprising control means including a pair of locking devices each arranged to prevent relative movement between said members until a predetermined force is applied to one of said movable members in either of two longitudinal directions. The control means includes two locking devices each of which locks in one of the two directions.The locking devices may comprise pivotable bolts pivoted on a sliding member so that the free ends of the bolts contact an abutment on one of the movable members to effect locking, the bolts being retracted from engagement with the abutment by movement of the sliding member.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: September 22, 1987
    Assignee: Eastman Christensen Co.
    Inventors: Gerhard Heidemann, Johannes Witte
  • Patent number: 4662460
    Abstract: The rotary drilling jar includes inner and outer mandrels releaseably locked against relative longitudinal movement. The inner mandrel is connected to the drilling string and the outer mandrel is connected to the drill bit or other well tools suspended below the jar in the well bore. A detent mechanism releaseably connects the inner and outer mandrels and includes a stack of Belleville springs that is configured to determined the amount of force required to move the detent mechanism to unlock the mandrels to permit relative longitudinal movement. In one aspect, the jar also includes an upwardly facing shoulder on the inner mandrel and outwardly facing shoulder on the outer mandrel that are in engagement when the jar is being lowered into, suspended in, and pulled from the well bore to prevent the imposition of string weight on the detent mechanism.
    Type: Grant
    Filed: November 4, 1985
    Date of Patent: May 5, 1987
    Assignee: Dresser Industries, Inc.
    Inventors: James B. Loeb, Andrew J. Osborne, Jr., Raul A. Miglierini
  • Patent number: 4607692
    Abstract: An upstroke wireline jar having a hammer 12 at the bottom end of an operating rod 3 which is axially slidable in a casing 2 having an anvil 13 at its upper end. This casing also includes a releasable coupling means which is biased downwards by a spring 5 to a rest position, said coupling means comprising a sleeve 4 which receives the rod 3 into its upper end and a plurality of arcuate segments 9 which are contained in apertures in the sleeve and engage in a circumferential groove 10 in the rod. Circumferential recesses 11 and 17 in the interior wall of the casing 2 are adapted to partially receive the segments when the sleeve is in appropriate registration therewith thereby facilitating disconnection and subsequent re-engagement of the operating rod with the sleeve. The spring 5 is mounted below the hammer so as to allow free travel of the latter along a substantial portion of the casing.
    Type: Grant
    Filed: December 20, 1984
    Date of Patent: August 26, 1986
    Inventor: Klaas Zwart
  • Patent number: 4582148
    Abstract: This invention relates to a double-acting drilling jar characterized by a constantly recharged hydraulic system operating in concert with a mechanical brake to actuate the latter and temporarily inhibit extension of the relatively moving parts utilizing a modest fluid pressure multiplied many-fold so as to exert a holding force far in excess of that which the hydraulic system could impose alone without destroying the seals. The invention also encompasses the virtual elimination of heat build-up through the use of drilling mud as the working fluid in a hydraulic system where once-used fluid is discharged downhole before it gets too hot while, at the same time, being replaced by a fresh supply of cool fluid from the surface. By calling upon the hydraulic system to only exert enough force to actuate the mechanical system, none of the fluid seals need be loaded to anywhere near their capacity.
    Type: Grant
    Filed: December 5, 1983
    Date of Patent: April 15, 1986
    Assignees: B. Walter Research Company, Ltd, Titan Tools, Inc.
    Inventor: Bruno H. Walter
  • Patent number: 4558976
    Abstract: Drill wrench apparatus for use with a drill bit, drilling steel, and a drive source for drilling a hole in the ceiling of a mine is disclosed. The drill wrench (18) includes a first end (50) having a non-circular aperture (58) suitable for receiving a hexagon-shaped drill bit shaft and the square head of a ceiling bolt. A central portion (52) connects first end (50) to second end (54) which also defines a non-circular aperture (38) extending through the wrench (18) to allow the removal of drill dust and debris. The second end (54) is cylindrically shaped, and includes pipe threads (62) on the outside surface suitable for meshing with threads (74) on the inside surface of a binding ring (72). The second end has a non-circular aperture (63) for receiving a hexagonal drill steel, and also defines a conical end surface (64). Binding ring (72) includes a bearing surface (76) for forcing a resilient annular shaped member (68) into the concave recess (64 ).
    Type: Grant
    Filed: February 6, 1984
    Date of Patent: December 17, 1985
    Inventor: John H. Begluitti
  • Patent number: 4545444
    Abstract: An energizer for use with a jar mechanism incorporated on inner and outer bodies in a well string to assist the jar mechanism in delivering an upward jar to the well string includes longitudinally spaced seal means between the inner and outer bodies forming a chamber for receiving a compressible medium therein. A differential area formed on one of the bodies within the compressible medium chamber compresses a compressible medium in the chamber as the well string is lowered to position the inner and outer bodies so that the jar mechanism is actuated to restrain relative longitudinal movement between the inner and outer bodies to an extended position whereby a pull force may be developed in the well string in one of the bodies.
    Type: Grant
    Filed: January 9, 1984
    Date of Patent: October 8, 1985
    Inventors: Derrel D. Webb, Edwin A. Anderson
  • Patent number: 4462471
    Abstract: Disclosed is a bidirectional fluid operated jarring apparatus. The apparatus includes a tubular body having a lower end defining a downwardly facing body hammer. A tubular knocker sub is axially slidingly mounted to the body adjacent the body hammer and includes an upwardly facing anvil engageable with the body hammer and spaced apart oppositely facing internal hammers, the upper one of which defines an internal anvil. A tubular mandrel having a low passage therethrough is axially movably mounted in the body and knocker sub. The mandrel includes a hammer positioned within the knocker sub between the internal shoulders. A valve is provided for closing the mandrel flow passage so that fluid pressure urges the mandrel axially downwardly with respect to the body and opening the mandrel flow passage upon predetermined downward movement of the mandrel. When the knocker sub is in a retractive position, the apparatus produces a downward jarring force.
    Type: Grant
    Filed: October 27, 1982
    Date of Patent: July 31, 1984
    Inventor: James Hipp
  • Patent number: 4401161
    Abstract: An oil well tool retrieving device in the form of a jar is provided having a hollow casing including a downwardly facing impact surface, a hammer of cylindrical construction slidably engaging an inner surface of the casing and impacting with the impact surface in one direction and an upwardly facing casing impact surface in the other, a mandrel of cylindrical construction from which the hammer is supported slidably engaging an inner surface of the casing, a double track raceway formed in and extending along a length of the mandrel, resiliently mounted bearing elements supported from the casing and for engaging the double track raceway and a hump element mounted in one of the tracks of the double track raceway while the other track is a free raceway.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: August 30, 1983
    Inventor: Kenneth R. Warren
  • Patent number: 4186807
    Abstract: An improvement on the tool shown in U.S. Pat. No. 3,853,187, this tool also embodies in a single structure inner and outer telescopically related tubular elements confining a body of operating liquid and comprising a hydraulically retarded up-blow jar, actuated by placing a lifting strain on the drill string, and a simple mechanically retarded down-blow jar actuated optionally by a controlled downward pressure of the drill string on the jar. This jar differs from the patented jar by inverting said structure and actuating said two jar mechanisms respectively by upward and downward movements of said inner element. It also embraces improved specific control devices for said up-blow and down-blow jar mechanisms.
    Type: Grant
    Filed: December 20, 1977
    Date of Patent: February 5, 1980
    Inventors: Wayne N. Sutliff, Jim L. Downen
  • Patent number: 4142597
    Abstract: A jar for use in facilitating the removal of stuck objects from wells. The jar has a telescoping assembly held in a collapsed position by a latching means urged into latching position by a resilient means so that the hammer of the jar is spaced from the anvil thereof. The release of the latching means is actuated by a predetermined longitudinal force applied to the upper end of the jar which overcomes the resilient means to cause the hammer to strike the anvil with a sudden impact translated by a connecting means from the jar to the stuck object.
    Type: Grant
    Filed: April 8, 1977
    Date of Patent: March 6, 1979
    Assignee: Otis Engineering Corporation
    Inventor: Russell A. Johnston
  • Patent number: 4113038
    Abstract: A drilling jar to be installed in a set of drill collars in a drill string is disclosed. In the illustrated embodiment, first and second tubular members telescope relative to one another. At the upper end of the lower tubular member, a set of protruding lugs match shoulders having undercuts which permit relative rotation of the two tubular members through part of a turn, thereby permitting the two members to axially telescope whereby locking or unlocking the telescoping movement is controlled. The lower tubular member has an upwardly facing shoulder which is abutted against the lower end of the upper tubular member. This permits the two to be reciprocated and banged together to create a jar for the drill string. When the string is jarred, the drill string can be jarred loose. the apparatus further includes a packer around a pipe positioned in the upper end of the upper tubular member.
    Type: Grant
    Filed: April 18, 1977
    Date of Patent: September 12, 1978
    Inventor: George M. Clark
  • Patent number: 4004643
    Abstract: The specification describes a drilling jar for connection in a rotary drill string. There is a trap space in the jar for collecting the products of wear between its moving parts. The drilling jar includes a generally tubular housing assembly, which has near its bottom, a wash pipe sleeve. There is a tubular mandrel assembly extending into the housing and movable with respect to it, which has near its bottom a wash pipe that slides in the sleeve. An annular trap space is defined near the top of the sleeve between its outer surface and an inner surface of the housing. Wear products are collected in the trap space and thereby prevented from entering between the wash pipe and sleeve where they would cause abrasion.
    Type: Grant
    Filed: March 3, 1976
    Date of Patent: January 25, 1977
    Inventor: James L. Newman