US465103A - Combined drill - Google Patents

Combined drill Download PDF

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US465103A
US465103A US465103DA US465103A US 465103 A US465103 A US 465103A US 465103D A US465103D A US 465103DA US 465103 A US465103 A US 465103A
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jaws
drill
cutting
bit
head
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21BEARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B25/00Apparatus for obtaining or removing undisturbed cores, e.g. core barrels, core extractors

Description

UNITED STAT-Es PATE T OFFICE HERMAN WEGNER, OF GR'OTON. SOUTH DAKOTA.

COMBINED DRILL, REAMEILIAND PIPE-PULLYER.

SPECIFICATION forming part of Letters Patent Nc. 465,103, dated December 15,1891.

Application filed June 10,18'91. seen in. 395,759. lNomodelJ.

To all whom it may concern;

Be it known that I, HERMAN WEGNER, a elitizen of the United States, residing at Groton in the county oi Brown and State of South akote,have invented certain new and useful Improvements in a Combined Drill, Reamer, nd

. Pipe-Puller; and I do hereby declare the ollowing to-be'a full, clear, and exact description of the invention, suchas will enable others ing separate tools for accomplishing such results.

. To this end my invention consists, essentially, in a combination-tool which is adapted to be readilyconverted either into a drill and reamer or a tube puller or lifter, according to requirements.

My invention also consists in certain improved features of construction and combination of parts, all as hereinafter described, and particularly pointed out in the claims at the endot this description.

Referring to the accompanying drawings, which form a part of thespecitication, Figure 1 represents a sectional elevation of the combined drill and reamer, showing the expansiblejaws in operative positions below the casing or tube section. Fig.'2 is a similar view showing the jaws confined within the casing in a contracted position. Fig. 3 is a sectional elevation of the bit or cutting-section of the drill proper detached from the drill-head. Fig; i is a sectional elevation of the device arranged for use'asa tube puller or lifter. Fig. 5 is a detail illustrating the pipe-puller. I

Like letters of reference are used to designate like parts in each of the several views.

A designates the drill-head; to which the elpausible cutti :jaws andsliding bit are removably-secui d, ashereinatter. set forth.

A is the bit or cutting section of the drill proper, which is preferably constructed with a cutting-edgev a and an enlarged head a,

formed integrally with an arrow-headed shank 1313', which is fitted to slide vertically in a socket C,forn'1ed in the lower end of the drillhead A, the movements of the bit being limited by the shoulders I) of the arrow-headl," and the enlarged head a of the bit which come in contact with the top and bottom edges, respectively, of the wall surrounding the socket O. V The shank B is provided with an elongated recess or slot 11', which preferably extends transversely through the shank and has seated therein a coiled or-other suitably-shaped spring or springs D, which rest 'upon a follower b and bear against the upper wall of said recess, so as to exert a constant pressure, tending to lift the bit A,'and thus hold the same normally in an elevated posi tion with its head a. resting against th'elower end of the (lrilLhead. 7

EE designate expanding jaws or reainers, which are held normally in an expanded po sltion or with their lower ends thrown 0utward, as shown in Fig. l, by means of the arrow-headed portion of the bit-shank. These jaws are secured in a vertical recess in the drill-head by means of pivot-bolts which pass transversely through the head and through the jaws near their upper ends, the jaws being located one at either side of the upper portion of the vertical recess, so as to straddle the arrow-headed portion B of the bit-shank, whereby the upward pressure of the latter will tend to force the lower ends of the jaws; apart and hold them normally in an expanded position. I

To provide a smooth bearing-surface between'the jaws and the inclined or beveled sides-or edges of the arrow-head B the jaws are formed at their lower ends with. rounded portions f on the inner sides thereofl-and theirl0wer-ends are concaved, as at f to provide cutting-edges f". At their upper ends on the inner sides thereof the jaws are beveled or inclined, as at g, to permit their lower ends .to'separate, and the adjacent faces of said beveled portions are grooved, as at g; for a purpose to behereinafter described. The upper ends of the jaws are also cutaway or recessed on the outer sides thereof, as at g. to

increasing the lateral to the drill-head from undue strain.

p rovidc bearings or seats i'ortlie lower ends of the springs l, whichlattcr preferably consist of stout steel plates which have elongated slots i, through which passset-screws or bolts '5', by which the spring-plates are adjustably secured to the drill-head. These springs, being located above the pivotal center of the jaws E, exert a constant pressure, which tends to force theupper ends of said jaws together and consequently separate their lower ends, and at the same time serve as guards or shields which prevent mud and dirt from gotting in behind the springs andin'to the joints, thus keeping the joints free from clogging matter and in good working condition. Thus it will be seen that the jaws will be thrown outward by the pressure of the springs alone, and that when the drill is thrust downward tho arrow-headed portion I5 ot the bit-shank will also force said jaws apart and hold them firmly,'so as to insure a successfuloperation, and any increased pressure or downward thrust; upon the drill stock or rod for the purpose of forcing the bit or cutting-section A into the earth will result in correspondingly pressure upon the depending cutting portions of the jaws E, and thereby force and hold them apart; but on the upward movement or when withdrawing the drill the pressure of the pipe-section or casing upon the outer edges of the cuttingjaws will force the sameinward, and as their lower ends bear upon the inclined sides of the pointed or arrow-headed end of the bit or cutting-section A the latter will be forced downward against the pressure of the spring or springs D, so as to permit the jaws to contract and allow the drill to be' withdrawn. Theupper ends of the jaws E are also arranged as shown in Fig. 1, so as to bear upon the upper wall of the vertical recess, and thus relieve the pivot-bolts which secure saidI jaws also provide the drill-head with a longitudinal bore or channel F, which extends vertically through the upper part of the drill-head and out through the boring-bar G, whereby water may be supplied to the cutting-surfaces, and by means of which the device may be kept free from mud and dirt.

When it is desired to use the device as a puller or lifter, the bolts which secure the springs Iin place are loosened and the jaws E are removed. Fig. 4) may then be substituted for the jaws E by securing them in position by means of the same bolts that secure said jaws in place. The springs I are then adjusted so that their lower ends will be seated in recesses h, formed in'the necks of the dogs IL as shown, so as to hold said dogs in position for insertion in the pipe or casing, and at the same time retain the dogs in proper position for pulling or lifting the pipes.

tion

From the foregoing description the operaof my invention willbe readily under- The dogs H (shown in the pressure of the spring D until the jaws occupy the position indicated in Fig.2. In this position the device may be lowered within the casing until'itpasses below the end of the lowermost section, whereupon the. jaws will be'thrown outward by thespringsI and the bit will be thrown upward by the recoil of the spring I), in which position of the parts drilling and reaming operations may be performed in the usual manner. By the described construction the'downward thrust of the drill will cause an upward thrust of the bit, and thereby the arrow-headed shank of the bit will be caused to force the cutting ends of the reaming-jaws apart, and any increase of pressure uponthe bit will correspondingly increase the pressure upon the arms E, and thereby insure the proper action of the rcnmingjaws.

\Vhen the device is adjusted for use as a pipe-puller, with the parts inthe position indicated in Figs. 4 and 5, it may be lowered within the pipe or casing until the dogs catch beneath the end of the section to be raised, (the sections being generally slightly separated at theirjoints, so as to permit this to be done,) and thereupon the section. may be raised and removed from the well; but if a section of pipe or easing cannot be raised for any reason, or if it is desired to remove'the device without lifting the pipe-section it may be lowereduntil the dogs pass beneath the lowermost pipe-section, as indicated in Fig. 4, and there on the springs I will force the dogs apart s d tliciently tocauset-he same to catch under the pipe, as shown in said figure,

and by continuing the upward pull upon the will be forced to release device the springs I them to drop over, so as the dogs and allow to permit the device to be removed fromthe casing.

It will of course'be un'derstoodthat the con-- struction and arrangement of the parts may be modified in a number of ways. without deact construction and arrangement described and shown; but What I claim, and desire to secure by Let tors-Patent, is-

' 1'. In a combined drill and combination, with the .drilhhead provided with a vertically-elongated recess and a socket at the lower end thereof, of the verticallysliding bit or cutting-section fitted in said reaming-tool, the I parting from the spirit of myinve'ntion, and hence I do not desire to be limited to the erev socket, the cutting-jaws or reamers pivoted near their upper ends in said rec'eis and havin g their lower cutting ends arranged tostraddie the shank of said cutting-section, and the springs adjustably secured to the drill-head aesnoe t and having their depcndiugends' arranged to. arrow-headed shank for limiting the move-1 bear'upon the short arms or ends of the cutmnts of the bit, and the spring adapted-to ting-jaws, substantially as described; hold said bit normally-in an elevated .posi- 5o 2. In combination withgthe drilt-hcad' hav tion, so as to expand the cutting-jaws, sub- 5 ing the recess and socket at the lower end stantially as described,

thereoifltlie vort-ically-siiding bitor cutting: i 6. ;In a combineddrill and reaming-tool, section fitted in said socket and provided with the combination, with the drill-stock or boran arrow-headed shank, the cutting-jaws or reamers pivoted in said recess with their depending cutting ends arranged to straddle the shank of said bit,'and the springsbearing on'- said j aws so as to force-the cutting ends there Y of apart, whereby said jaws are adaptedto-be normally expanded bythe action of thesprings ,scribed.

and positively expanded by the action of the 7. cutting-section on the downward thrust of the drill, substantiaily as described.

3. In combination with the drill-head; the I channel leading to said recess, of the bit or" cutting-section and the pivoted jawshaving grooved upper ends communicating with the water-channel extending through the driib A-,- co nvertible drill, reamer, and pipepuller comprising the vertically-recessed drill-head, the spring-plates adjustably Se.- cu red to said drill-head, with their lower ends 65 ing-bar and recessed head havinga water-'55 .head and boring-bar, -sulistantia-ll-y as. deep vertically-sliding bit or cutting-section having an arrow-headedshank, the'p'ivoted cutting-jaws arranged above said sliding bit, one at either side 01? .the pointed arrow headed shank, the springs adapted to hold said jaws in a-normally-expanded position, and the spring for forcing said arrow-head upward bedependingbelow the upper wall of said recess,

and the interchangeable cutting-jawsand; pipe-lifting dogs, substantially as described.

8'. In combination with the dril1-head,'t h0 f spring-plates adjustably secured thereto, and .70-

the removable pivot-bolts adapted to receive eitherthc cutting-jaws or pipe-lifting dogs,

tween the depending cutting portions of said jaws, substantially as described. r

4. In a combined drill. and reaming-tool, the combination, with the recessed head,-ot.

substantially as described. 9."In combination with the drill-head provided with the vertically-elongated recess and 7 5 .the socket at the lowerend thereof, the exthe pivoted expansible cutting-jaws, and the vertically-sliding spring-pressed 'bit'or cut- Ling-section having the pointed head adapted.

to separate the cutting ends of said jaws,

whercbyithc jaws will be normally expandedbythe forc'e'of the spring and forcibly exp d d y the downward thrust of the drill and maybe contracted against the pressure of the spring upon the bit on the movement of the drill, substantially as described,

. 5. In a combined drill andreanier, the combination, with the recessed drill-head having the socket at the lower end thereofl-of ,the

pivoted cuttingjaws, the vertically sliding bit or-cutting-section fitted to'slide in-said socket and having the enlarged head and the upward pr'essureof thebiton.

withdrawal 0'!- upward.

pansible cutting-jaws on 'reamers' pivoted 'in said recess, thespring-plates bearing upon said jaws, so as to expand the cutting ends thereof, the vertically-sliding bit or cutting-4 80, section fitted in said socket and provided with an arrow-headed vertically-slotted shank; v

and the spring seated in the slot of said shank and adapted to force the same upward between the cutting ends of said jaws for. the :85

purpose of expanding the same, substantially as described.

In tcstimonywhorcof I affix my signature in v presence ottwo witnesses. V nERMAN WEGNER. Witnesses: A

N.S.- BASOM,

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Cited By (83)

* Cited by examiner, † Cited by third party
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US2466991A (en) * 1945-06-06 1949-04-12 Archer W Kammerer Rotary drill bit
US2485826A (en) * 1948-04-19 1949-10-25 Peter J Harinck Well drilling means
US2545033A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Well boring apparatus
US2545034A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Expansible rotary drill bit and method of assembling and disassembling the same
US2545035A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Rotary well drilling bit
US2566671A (en) * 1948-08-21 1951-09-04 Pearl Edith Livingstone Rotary drilled hole enlarger
US2771275A (en) * 1952-01-29 1956-11-20 Exxon Research Engineering Co Hard formation retractable drill bit
US7198119B1 (en) 2005-11-21 2007-04-03 Hall David R Hydraulic drill bit assembly
US20070114071A1 (en) * 2005-11-21 2007-05-24 Hall David R Rotary Bit with an Indenting Member
US20070114066A1 (en) * 2005-11-21 2007-05-24 Hall David R A Drill Bit Assembly Adapted to Provide Power Downhole
US20070114062A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with a Logging Device
US20070114068A1 (en) * 2005-11-21 2007-05-24 Mr. David Hall Drill Bit Assembly for Directional Drilling
US20070221406A1 (en) * 2006-03-24 2007-09-27 Hall David R Jack Element for a Drill Bit
US20070229304A1 (en) * 2006-03-23 2007-10-04 Hall David R Drill Bit with an Electrically Isolated Transmitter
US20080029312A1 (en) * 2006-03-23 2008-02-07 Hall David R Indenting Member for a Drill Bit
US20080087473A1 (en) * 2006-10-13 2008-04-17 Hall David R Percussive Drill Bit
US7392857B1 (en) 2007-01-03 2008-07-01 Hall David R Apparatus and method for vibrating a drill bit
US7419018B2 (en) 2006-11-01 2008-09-02 Hall David R Cam assembly in a downhole component
US7419016B2 (en) 2006-03-23 2008-09-02 Hall David R Bi-center drill bit
US7424922B2 (en) 2005-11-21 2008-09-16 Hall David R Rotary valve for a jack hammer
US20080296015A1 (en) * 2007-06-04 2008-12-04 Hall David R Clutch for a Jack Element
US7484576B2 (en) 2006-03-23 2009-02-03 Hall David R Jack element in communication with an electric motor and or generator
US7497279B2 (en) 2005-11-21 2009-03-03 Hall David R Jack element adapted to rotate independent of a drill bit
US7533737B2 (en) 2005-11-21 2009-05-19 Hall David R Jet arrangement for a downhole drill bit
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
US7559379B2 (en) 2005-11-21 2009-07-14 Hall David R Downhole steering
US20090183920A1 (en) * 2006-03-23 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US20090183919A1 (en) * 2005-11-21 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7591327B2 (en) 2005-11-21 2009-09-22 Hall David R Drilling at a resonant frequency
US7600586B2 (en) 2006-12-15 2009-10-13 Hall David R System for steering a drill string
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US7641002B2 (en) 2005-11-21 2010-01-05 Hall David R Drill bit
US20100059289A1 (en) * 2006-08-11 2010-03-11 Hall David R Cutting Element with Low Metal Concentration
US20100089648A1 (en) * 2006-08-11 2010-04-15 Hall David R Fixed Bladed Bit that Shifts Weight between an Indenter and Cutting Elements
US7721826B2 (en) 2007-09-06 2010-05-25 Schlumberger Technology Corporation Downhole jack assembly sensor
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US7762353B2 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Downhole valve mechanism
US20100326740A1 (en) * 2009-06-26 2010-12-30 Hall David R Bonded Assembly Having Low Residual Stress
US20110048811A1 (en) * 2005-11-21 2011-03-03 Schlumberger Technology Corporation Drill bit with a retained jack element
US7954401B2 (en) 2006-10-27 2011-06-07 Schlumberger Technology Corporation Method of assembling a drill bit with a jack element
US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
US7967083B2 (en) 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US20110180324A1 (en) * 2006-08-11 2011-07-28 Hall David R Sensor on a Formation Engaging Member of a Drill Bit
US20110180325A1 (en) * 2006-08-11 2011-07-28 Hall David R Sensor on a Formation Engaging Member of a Drill Bit
US8011457B2 (en) 2006-03-23 2011-09-06 Schlumberger Technology Corporation Downhole hammer assembly
US8122980B2 (en) 2007-06-22 2012-02-28 Schlumberger Technology Corporation Rotary drag bit with pointed cutting elements
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8205688B2 (en) 2005-11-21 2012-06-26 Hall David R Lead the bit rotary steerable system
US8215420B2 (en) 2006-08-11 2012-07-10 Schlumberger Technology Corporation Thermally stable pointed diamond with increased impact resistance
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US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US8297375B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Downhole turbine
US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
US8316964B2 (en) 2006-03-23 2012-11-27 Schlumberger Technology Corporation Drill bit transducer device
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US8342266B2 (en) 2011-03-15 2013-01-01 Hall David R Timed steering nozzle on a downhole drill bit
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US8360174B2 (en) 2006-03-23 2013-01-29 Schlumberger Technology Corporation Lead the bit rotary steerable tool
USD678368S1 (en) 2007-02-12 2013-03-19 David R. Hall Drill bit with a pointed cutting element
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US8418784B2 (en) 2010-05-11 2013-04-16 David R. Hall Central cutting region of a drilling head assembly
US8434573B2 (en) 2006-08-11 2013-05-07 Schlumberger Technology Corporation Degradation assembly
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US8522897B2 (en) 2005-11-21 2013-09-03 Schlumberger Technology Corporation Lead the bit rotary steerable tool
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US8550190B2 (en) 2010-04-01 2013-10-08 David R. Hall Inner bit disposed within an outer bit
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2466991A (en) * 1945-06-06 1949-04-12 Archer W Kammerer Rotary drill bit
US2545033A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Well boring apparatus
US2545034A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Expansible rotary drill bit and method of assembling and disassembling the same
US2545035A (en) * 1947-10-13 1951-03-13 Archer W Kammerer Rotary well drilling bit
US2485826A (en) * 1948-04-19 1949-10-25 Peter J Harinck Well drilling means
US2566671A (en) * 1948-08-21 1951-09-04 Pearl Edith Livingstone Rotary drilled hole enlarger
US2771275A (en) * 1952-01-29 1956-11-20 Exxon Research Engineering Co Hard formation retractable drill bit
US7198119B1 (en) 2005-11-21 2007-04-03 Hall David R Hydraulic drill bit assembly
US20070114071A1 (en) * 2005-11-21 2007-05-24 Hall David R Rotary Bit with an Indenting Member
US20070114066A1 (en) * 2005-11-21 2007-05-24 Hall David R A Drill Bit Assembly Adapted to Provide Power Downhole
US20070114065A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly
US20070114067A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with an Indenting Member
US20070114062A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with a Logging Device
US20070114068A1 (en) * 2005-11-21 2007-05-24 Mr. David Hall Drill Bit Assembly for Directional Drilling
US20070114061A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with a Probe
US7225886B1 (en) 2005-11-21 2007-06-05 Hall David R Drill bit assembly with an indenting member
US7258179B2 (en) 2005-11-21 2007-08-21 Hall David R Rotary bit with an indenting member
US7270196B2 (en) 2005-11-21 2007-09-18 Hall David R Drill bit assembly
US8522897B2 (en) 2005-11-21 2013-09-03 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US20110048811A1 (en) * 2005-11-21 2011-03-03 Schlumberger Technology Corporation Drill bit with a retained jack element
US8020471B2 (en) 2005-11-21 2011-09-20 Schlumberger Technology Corporation Method for manufacturing a drill bit
US7328755B2 (en) 2005-11-21 2008-02-12 Hall David R Hydraulic drill bit assembly
US7337858B2 (en) 2005-11-21 2008-03-04 Hall David R Drill bit assembly adapted to provide power downhole
US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
US7360610B2 (en) 2005-11-21 2008-04-22 Hall David R Drill bit assembly for directional drilling
US8528664B2 (en) 2005-11-21 2013-09-10 Schlumberger Technology Corporation Downhole mechanism
US7398837B2 (en) 2005-11-21 2008-07-15 Hall David R Drill bit assembly with a logging device
US20080179098A1 (en) * 2005-11-21 2008-07-31 Hall David R Drill Bit Assembly for Directional Drilling
US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
US7641002B2 (en) 2005-11-21 2010-01-05 Hall David R Drill bit
US7424922B2 (en) 2005-11-21 2008-09-16 Hall David R Rotary valve for a jack hammer
US7426968B2 (en) 2005-11-21 2008-09-23 Hall David R Drill bit assembly with a probe
US8297375B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Downhole turbine
US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
US7497279B2 (en) 2005-11-21 2009-03-03 Hall David R Jack element adapted to rotate independent of a drill bit
US7506701B2 (en) * 2005-11-21 2009-03-24 Hall David R Drill bit assembly for directional drilling
US8205688B2 (en) 2005-11-21 2012-06-26 Hall David R Lead the bit rotary steerable system
US7533737B2 (en) 2005-11-21 2009-05-19 Hall David R Jet arrangement for a downhole drill bit
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
US7559379B2 (en) 2005-11-21 2009-07-14 Hall David R Downhole steering
US8225883B2 (en) 2005-11-21 2012-07-24 Schlumberger Technology Corporation Downhole percussive tool with alternating pressure differentials
US20090183919A1 (en) * 2005-11-21 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US8267196B2 (en) 2005-11-21 2012-09-18 Schlumberger Technology Corporation Flow guide actuation
US7591327B2 (en) 2005-11-21 2009-09-22 Hall David R Drilling at a resonant frequency
US8281882B2 (en) 2005-11-21 2012-10-09 Schlumberger Technology Corporation Jack element for a drill bit
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US8950517B2 (en) 2005-11-21 2015-02-10 Schlumberger Technology Corporation Drill bit with a retained jack element
US7661487B2 (en) 2006-03-23 2010-02-16 Hall David R Downhole percussive tool with alternating pressure differentials
US20090183920A1 (en) * 2006-03-23 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7694756B2 (en) 2006-03-23 2010-04-13 Hall David R Indenting member for a drill bit
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US8550190B2 (en) 2010-04-01 2013-10-08 David R. Hall Inner bit disposed within an outer bit
US9677343B2 (en) 2010-04-23 2017-06-13 Schlumberger Technology Corporation Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements
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US8418784B2 (en) 2010-05-11 2013-04-16 David R. Hall Central cutting region of a drilling head assembly
US8820440B2 (en) 2010-10-01 2014-09-02 David R. Hall Drill bit steering assembly
US8342266B2 (en) 2011-03-15 2013-01-01 Hall David R Timed steering nozzle on a downhole drill bit

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