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Pilot bit

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Publication number
US2540464A
US2540464A US75152947A US2540464A US 2540464 A US2540464 A US 2540464A US 75152947 A US75152947 A US 75152947A US 2540464 A US2540464 A US 2540464A
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Prior art keywords
bit
core
stinger
sub
pilot
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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John C Stokes
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Reed Roller Bit Co
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Reed Roller Bit Co
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Publication date
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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
    • E21B10/00Drill bits
    • E21B10/02Core bits
    • E21B10/06Roller core bits
    • 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
    • E21B10/00Drill bits
    • E21B10/08Roller bits
    • E21B10/14Roller bits combined with non-rolling cutters other than of leading-portion type

Description

Feb. 6, 1951 J. c. STOKES 2,540,464

PILOT BIT Filed May 51, 1947 w. 2 I 3 J'o/m g vgagoljees TORNEYS Patented Feb. 6, 1951 PILOT BIT John C. Stokes, Houston, Tex., assignor to Reed Roller Bit Company, Houston, Tex., a corporation of Texas Application May 31, 1947, Serial No. 751,529

' provided for this purpose, such as shown in United States Patent No. 1,399,863 filed December 13, 1921, but these bits are expensive and have a lim ited use. It is desirable to modify another conventional bit so that it is able to function as a pilot bit in addition to the function for which it was manufactured.

An object of this invention is to provide a pilot bit made up in part by a conventional core bit.

Another object is to provide an adapter sub by means of whicha stinger may be mounted in operable relation with a conventional core bit.

A further object is to provide an adapter sub and stinger combination usable in conjunction with a conventional core bit to make up a pilot bit.

Yet another object is to provide an adapter sub by means of which a stinger may be mounted in operable relation with a core bit to provide a I pilot bit.

' parts in the various views;

Fig. 1 is a vertical sectional view through a pilot bit embodying this invention; and

Fig. 2 is a bottom plan view of the bit shown in Fig. 1.

Referring to the drawings, the numeral H3 designates a conventional core bit of the roller cutter type. The cutters on the bit shown are arranged in two pairs, cutters ll being disposed at an angle to cut the-outside of a hole, and cutters [2 are adapted to out about and form the core. It is to be understood that the cutter type core bit is shown by way of illustration and not by way of limitation and that a drag type core bit may be used in a similar manner. In the drawings the bit is shown with the core barrel removed from the usual guide support l3, which in normal operations supports and guides the core barrel, but

Z Claims. (Cl. 255-72) elements of the core bit.

2 serves in this invention as a guide support for the shank Ma of stinger M.

A tubular coupling member or adapter sub it is provided as a means for mounting a stinger in operative relation with the core bit. The sub has threaded fittings 15a and l5b at its ends, respectively, and is adapted to couple the core bit to the lower end of a drill stem not shown in the drawings. Usually the threaded box lbb will receive the lower end of a drill collar, not shown, which customarily constitutes the lower end of the drill stem.

Sub l5 has formed therein a bridge It having a threaded central opening 16a adapted to removably receive the shank I i'a of stinger E4. The stinger shank extends through the guide support 13 of the bit and axially through the bit body. The stinger is fabricated with a somewhat longer shank than heretofore to provide proper spacing of the stinger cutter II from the cutter Cutter ii is shown as a blade but roller cutters may be used. The stinger shank H! has a central passage to provide for flow of drilling fluid upon cutter blade ii, the fluid being played directly over the surface of the blade through ports It best shown in Fig. 2.

In order that drilling fluid may be played upon the cutter elements, roller cutters H and E2 in the embodiment of the drawings, flow passages it are provided in bridge 16 of the sub to provide for flow of drilling fluid past the bridge. The guide support l3 has grooves i311 in its outer periphery, through which drilling fluid flows and plays upon the cutters. It will be understood that the guide support is held within the bit body by abutment of the tapered shoulders at the upper end of the body and support and by welding material as shown at 202 It is thought that the assembly of the pilot bit is apparent from its simplicity and the foregoing description. In making up a pilot bit, which operation can be performed in the field in accordance with this invention, the core barrel is first removed from a core bit and the core bit is threadedly secured to the fitting iiia of the adapter sub [5. The stinger shank I4 is then inserted axially through the bit extending through the central passage of the guide support and threaded into the central opening ita of bridge 18. This completes the assembly of the pilot bit which may then be connected to the lower end of a drill collar or other drill stem fitting and lowered within a well bore.

Whenin the course of drilling a well bore it becomes desirable to use a pilot bit, a conventional core bit may be quickly and readily transformed into the pilot bit in the manner outlined above. This bit may then be lowered into the well bore on the lower end of a drill stem in accordance with usual rotary drilling operations. When the use of the bit as a pilot bit is no longer required the bit may be withdrawn from the well bore by withdrawing the drill stem according to the usual practice and the assembly including sub 55, bit it and the stinger may be removed from the drill stem. If it again becomes desirable to use the bit ii! in a core bit assembly, stinger shank. E la is rotated to remove the stinger from its connection with bridge 16 and the stinger is withdrawn from the assembly. Bit it may then be readily removed from sub l5 and a core barrel may then be inserted within guide support l3 and the reassembled core bit unit is then ready for use in conventional core drilling operations.

It will be seen that the objects of this invention have been accomplished. There has been provided a pilot which may be readily made up from a core bit. The means for mounting the stinger in operative relation with the core bit to provide a pilot bit is such that the operation may be carried out under field conditions. The constructionis such that the pilot bit may be readily broken down and the core bit reassembled. The adapter sub which makes this possible may be economically manufactured and is of great utility in drilling operations as it makes possible a dual use of the usual core bit.

From th foregoing it will be seen that this invention is one well adapted to attain all of the ends and objects hereinabove set forth, together with other advantages which are obvious and which are inherent to the structure.

It will be understood that certain features and subcornbinations are of utility and may be employed without reference to other features and subcombinations. This is contemplated by and is within the scope of the claims.

As many possible embodiments may be made of the invention without departing from the scope thereof it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having described my invention, I claim:

1. In combination a tubular sub having a fitting at one end adapted to receive the lower end of.a drill stern, a core bit having cutters and also having a bore, the bit secured to the other end of the sub, a stinger guide support with a central passage therethrough extending through the bore of the bit, flow passages in the guide support radially of the central passage for playing drilling fluid upon the core bit cutters, a bridge extending across the bore of the sub adjacent the connection between the sub and bit, a stinger having its upper end threaded into the bridge and extending axially through the guide support, and passages establishing communication between the upper and lower sides of the bridge.

2. In combination, a relatively short sub adapted to be connected with a core bit and having an axial bore, a tubular guide member disposed axially within the core bit, a transverse bridge element extending across the bore of the sub and disposed in close proximity to the upper end of the bit and having an axial threaded opening, and an elongate stinger having its upper end threaded into the opening in the bridge and extending downwardly through the tubular guide member, within the bit and having its lower end projecting in a plane a considerable distance in advance of the core bit, said bridge element having passages extending therethrough for establishing communication between the area above said bridge and the area therebelow.

JOHN C. STOKES.

REFERENCES CITED The following references are of record in the file of this patent;

UNITED STATES PATENTS Number Name Date 1,560,781 Hair et a1 Nov. 10, 1925 1,868,348 De Costa July 19, 1932 2,020,599 Barrett et al Nov. 12, 1935 2,064,255 Garfield Dec. 15, 1936

US2540464A 1947-05-31 1947-05-31 Pilot bit Expired - Lifetime US2540464A (en)

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Cited By (82)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725215A (en) * 1953-05-05 1955-11-29 Donald B Macneir Rotary rock drilling tool
US2901223A (en) * 1955-11-30 1959-08-25 Hughes Tool Co Earth boring drill
US2963102A (en) * 1956-08-13 1960-12-06 James E Smith Hydraulic drill bit
US3101799A (en) * 1960-11-29 1963-08-27 Paul W Grabow Steam nozzle boring device
US5351765A (en) * 1993-08-31 1994-10-04 Baroid Technology, Inc. Coring assembly and method
US7198119B1 (en) 2005-11-21 2007-04-03 Hall David R Hydraulic drill bit assembly
US20070114066A1 (en) * 2005-11-21 2007-05-24 Hall David R A Drill Bit Assembly Adapted to Provide Power Downhole
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
US20070119630A1 (en) * 2005-11-21 2007-05-31 Hall David R Jack Element Adapted to Rotate Independent of a Drill Bit
US20070125580A1 (en) * 2005-11-21 2007-06-07 Hall David R Jet Arrangement for a Downhole Drill Bit
US20070221406A1 (en) * 2006-03-24 2007-09-27 Hall David R Jack Element for a Drill Bit
US20070221412A1 (en) * 2005-11-21 2007-09-27 Hall David R Rotary Valve for a Jack Hammer
US20070221408A1 (en) * 2005-11-21 2007-09-27 Hall David R Drilling at a Resonant Frequency
US20070229232A1 (en) * 2006-03-23 2007-10-04 Hall David R Drill Bit Transducer Device
US20070229304A1 (en) * 2006-03-23 2007-10-04 Hall David R Drill Bit with an Electrically Isolated Transmitter
US20070272443A1 (en) * 2005-11-21 2007-11-29 Hall David R Downhole Steering
US20080035380A1 (en) * 2006-08-11 2008-02-14 Hall David R Pointed Diamond Working Ends on a Shear Bit
US20080048484A1 (en) * 2006-08-11 2008-02-28 Hall David R Shank for an Attack Tool
US20080087473A1 (en) * 2006-10-13 2008-04-17 Hall David R Percussive Drill Bit
US20080099243A1 (en) * 2006-10-27 2008-05-01 Hall David R Method of Assembling a Drill Bit with a Jack Element
US20080142263A1 (en) * 2006-03-23 2008-06-19 Hall David R Downhole Valve Mechanism
US7392857B1 (en) 2007-01-03 2008-07-01 Hall David R Apparatus and method for vibrating a drill bit
US20080156541A1 (en) * 2005-12-22 2008-07-03 Hall David R Downhole Hammer Assembly
US20080173482A1 (en) * 2005-11-21 2008-07-24 Hall David R 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
US20080296015A1 (en) * 2007-06-04 2008-12-04 Hall David R Clutch for a Jack Element
US20080302572A1 (en) * 2005-11-21 2008-12-11 Hall David R Drill Bit Porting System
US20080314647A1 (en) * 2007-06-22 2008-12-25 Hall David R Rotary Drag Bit with Pointed Cutting Elements
US20090000828A1 (en) * 2006-08-11 2009-01-01 Hall David R Roof Bolt Bit
US7484576B2 (en) 2006-03-23 2009-02-03 Hall David R Jack element in communication with an electric motor and or generator
WO2008076625A3 (en) * 2006-12-15 2009-02-26 David R Hall System for steering a drill string
US20090057016A1 (en) * 2005-11-21 2009-03-05 Hall David R Downhole Turbine
US20090065251A1 (en) * 2007-09-06 2009-03-12 Hall David R Downhole Jack Assembly Sensor
US20090133936A1 (en) * 2006-03-23 2009-05-28 Hall David R Lead the Bit Rotary Steerable Tool
US20090133938A1 (en) * 2006-08-11 2009-05-28 Hall David R Thermally Stable Pointed Diamond with Increased Impact Resistance
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
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
US20090236148A1 (en) * 2005-11-21 2009-09-24 Hall David R Flow Guide Actuation
US7600586B2 (en) 2006-12-15 2009-10-13 Hall David R System for steering a drill string
US20090255733A1 (en) * 2005-11-21 2009-10-15 Hall David R Lead the Bit Rotary Steerable System
US20090273224A1 (en) * 2008-04-30 2009-11-05 Hall David R Layered polycrystalline diamond
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US20090294182A1 (en) * 2006-08-11 2009-12-03 Hall David R Degradation Assembly
US20100000794A1 (en) * 2005-11-21 2010-01-07 Hall David R Lead the Bit Rotary Steerable Tool
US20100059289A1 (en) * 2006-08-11 2010-03-11 Hall David R Cutting Element with Low Metal Concentration
US20100065334A1 (en) * 2005-11-21 2010-03-18 Hall David R Turbine Driven Hammer that Oscillates at a Constant Frequency
US20100065332A1 (en) * 2006-08-11 2010-03-18 Hall David R Method for Drilling with a Fixed Bladed Bit
US7694756B2 (en) 2006-03-23 2010-04-13 Hall David R Indenting member for a drill bit
USD620510S1 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Drill bit
US20100326740A1 (en) * 2009-06-26 2010-12-30 Hall David R Bonded Assembly Having Low Residual Stress
US20110042150A1 (en) * 2006-08-11 2011-02-24 Hall David R Roof Mining Drill Bit
US20110048811A1 (en) * 2005-11-21 2011-03-03 Schlumberger Technology Corporation Drill bit with a retained jack element
US20110080036A1 (en) * 2007-05-15 2011-04-07 Schlumberger Technology Corporation Spring Loaded Pick
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
US20120111557A1 (en) * 2009-06-03 2012-05-10 2K Tools As Landing sub for a wiper
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8333254B2 (en) 2010-10-01 2012-12-18 Hall David R Steering mechanism with a ring disposed about an outer diameter of a drill bit and method for drilling
US8342266B2 (en) 2011-03-15 2013-01-01 Hall David R Timed steering nozzle on a downhole drill bit
USD674422S1 (en) 2007-02-12 2013-01-15 Hall David R Drill bit with a pointed cutting element and a shearing cutting element
USD678368S1 (en) 2007-02-12 2013-03-19 David R. Hall Drill bit with a pointed cutting element
US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
US8418784B2 (en) 2010-05-11 2013-04-16 David R. Hall Central cutting region of a drilling head assembly
US8528664B2 (en) 2005-11-21 2013-09-10 Schlumberger Technology Corporation Downhole mechanism
US8550190B2 (en) 2010-04-01 2013-10-08 David R. Hall Inner bit disposed within an outer bit
US8567532B2 (en) 2006-08-11 2013-10-29 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle
US8590644B2 (en) 2006-08-11 2013-11-26 Schlumberger Technology Corporation Downhole drill bit
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US8820440B2 (en) 2010-10-01 2014-09-02 David R. Hall Drill bit steering assembly
US8839888B2 (en) 2010-04-23 2014-09-23 Schlumberger Technology Corporation Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements
US9051795B2 (en) 2006-08-11 2015-06-09 Schlumberger Technology Corporation Downhole drill bit
US9068410B2 (en) 2006-10-26 2015-06-30 Schlumberger Technology Corporation Dense diamond body
US9316061B2 (en) 2006-08-11 2016-04-19 David R. Hall High impact resistant degradation element
US9366089B2 (en) 2006-08-11 2016-06-14 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1560781A (en) * 1925-11-10 Device foe
US1868348A (en) * 1930-02-28 1932-07-19 Costa John B De Convertible drilling tool
US2020599A (en) * 1934-03-01 1935-11-12 George J Barrett Drilling apparatus
US2064255A (en) * 1936-06-19 1936-12-15 Hughes Tool Co Removable core breaker

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1560781A (en) * 1925-11-10 Device foe
US1868348A (en) * 1930-02-28 1932-07-19 Costa John B De Convertible drilling tool
US2020599A (en) * 1934-03-01 1935-11-12 George J Barrett Drilling apparatus
US2064255A (en) * 1936-06-19 1936-12-15 Hughes Tool Co Removable core breaker

Cited By (138)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2725215A (en) * 1953-05-05 1955-11-29 Donald B Macneir Rotary rock drilling tool
US2901223A (en) * 1955-11-30 1959-08-25 Hughes Tool Co Earth boring drill
US2963102A (en) * 1956-08-13 1960-12-06 James E Smith Hydraulic drill bit
US3101799A (en) * 1960-11-29 1963-08-27 Paul W Grabow Steam nozzle boring device
US5351765A (en) * 1993-08-31 1994-10-04 Baroid Technology, Inc. Coring assembly and method
US20080173482A1 (en) * 2005-11-21 2008-07-24 Hall David R Drill Bit
US20070114066A1 (en) * 2005-11-21 2007-05-24 Hall David R A Drill Bit Assembly Adapted to Provide Power Downhole
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
US20070114061A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with a Probe
US20070114065A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly
US20070114071A1 (en) * 2005-11-21 2007-05-24 Hall David R Rotary Bit with an Indenting Member
US20070119630A1 (en) * 2005-11-21 2007-05-31 Hall David R Jack Element Adapted to Rotate Independent of a Drill Bit
US7225886B1 (en) 2005-11-21 2007-06-05 Hall David R Drill bit assembly with an indenting member
US20070125580A1 (en) * 2005-11-21 2007-06-07 Hall David R Jet Arrangement for a Downhole Drill Bit
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
US7198119B1 (en) 2005-11-21 2007-04-03 Hall David R Hydraulic drill bit assembly
US20070221412A1 (en) * 2005-11-21 2007-09-27 Hall David R Rotary Valve for a Jack Hammer
US20070221408A1 (en) * 2005-11-21 2007-09-27 Hall David R Drilling at a Resonant Frequency
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US7641002B2 (en) 2005-11-21 2010-01-05 Hall David R Drill bit
US20070272443A1 (en) * 2005-11-21 2007-11-29 Hall David R Downhole Steering
US7328755B2 (en) 2005-11-21 2008-02-12 Hall David R Hydraulic drill bit assembly
US8950517B2 (en) 2005-11-21 2015-02-10 Schlumberger Technology Corporation Drill bit with a retained jack element
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US7337858B2 (en) 2005-11-21 2008-03-04 Hall David R Drill bit assembly adapted to provide power downhole
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US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
US20090236148A1 (en) * 2005-11-21 2009-09-24 Hall David R Flow Guide Actuation
US7591327B2 (en) 2005-11-21 2009-09-22 Hall David R Drilling at a resonant frequency
US7398837B2 (en) 2005-11-21 2008-07-15 Hall David R Drill bit assembly with a logging device
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
US8297375B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Downhole turbine
US20110048811A1 (en) * 2005-11-21 2011-03-03 Schlumberger Technology Corporation Drill bit with a retained jack element
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
US8281882B2 (en) 2005-11-21 2012-10-09 Schlumberger Technology Corporation Jack element for a drill bit
US20080302572A1 (en) * 2005-11-21 2008-12-11 Hall David R Drill Bit Porting System
US8267196B2 (en) 2005-11-21 2012-09-18 Schlumberger Technology Corporation Flow guide actuation
US8225883B2 (en) 2005-11-21 2012-07-24 Schlumberger Technology Corporation Downhole percussive tool with alternating pressure differentials
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US8205688B2 (en) 2005-11-21 2012-06-26 Hall David R Lead the bit rotary steerable system
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US8020471B2 (en) 2005-11-21 2011-09-20 Schlumberger Technology Corporation Method for manufacturing a drill bit
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US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
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US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
US20080156541A1 (en) * 2005-12-22 2008-07-03 Hall David R Downhole Hammer Assembly
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US7484576B2 (en) 2006-03-23 2009-02-03 Hall David R Jack element in communication with an electric motor and or generator
US7419016B2 (en) 2006-03-23 2008-09-02 Hall David R Bi-center drill bit
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US8130117B2 (en) 2006-03-23 2012-03-06 Schlumberger Technology Corporation Drill bit with an electrically isolated transmitter
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US20090000828A1 (en) * 2006-08-11 2009-01-01 Hall David R Roof Bolt Bit
US9366089B2 (en) 2006-08-11 2016-06-14 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle
US9316061B2 (en) 2006-08-11 2016-04-19 David R. Hall High impact resistant degradation element
US9051795B2 (en) 2006-08-11 2015-06-09 Schlumberger Technology Corporation Downhole drill bit
US20080035380A1 (en) * 2006-08-11 2008-02-14 Hall David R Pointed Diamond Working Ends on a Shear Bit
US8567532B2 (en) 2006-08-11 2013-10-29 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle
US20100059289A1 (en) * 2006-08-11 2010-03-11 Hall David R Cutting Element with Low Metal Concentration
US20110042150A1 (en) * 2006-08-11 2011-02-24 Hall David R Roof Mining Drill Bit
US20090294182A1 (en) * 2006-08-11 2009-12-03 Hall David R Degradation Assembly
US8714285B2 (en) 2006-08-11 2014-05-06 Schlumberger Technology Corporation Method for drilling with a fixed bladed bit
US8622155B2 (en) 2006-08-11 2014-01-07 Schlumberger Technology Corporation Pointed diamond working ends on a shear bit
US20090133938A1 (en) * 2006-08-11 2009-05-28 Hall David R Thermally Stable Pointed Diamond with Increased Impact Resistance
US8596381B2 (en) 2006-08-11 2013-12-03 David R. Hall Sensor on a formation engaging member of a drill bit
US20110180324A1 (en) * 2006-08-11 2011-07-28 Hall David R Sensor on a Formation Engaging Member of a Drill Bit
US8590644B2 (en) 2006-08-11 2013-11-26 Schlumberger Technology Corporation Downhole drill bit
US20080048484A1 (en) * 2006-08-11 2008-02-28 Hall David R Shank for an Attack Tool
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US8434573B2 (en) 2006-08-11 2013-05-07 Schlumberger Technology Corporation Degradation assembly
US9708856B2 (en) 2006-08-11 2017-07-18 Smith International, Inc. Downhole drill bit
US20100065332A1 (en) * 2006-08-11 2010-03-18 Hall David R Method for Drilling with a Fixed Bladed Bit
US8191651B2 (en) * 2006-08-11 2012-06-05 Hall David R Sensor on a formation engaging member of a drill bit
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8240404B2 (en) 2006-08-11 2012-08-14 Hall David R Roof bolt bit
US8215420B2 (en) 2006-08-11 2012-07-10 Schlumberger Technology Corporation Thermally stable pointed diamond with increased impact resistance
US20110180325A1 (en) * 2006-08-11 2011-07-28 Hall David R Sensor on a Formation Engaging Member of a Drill Bit
US8573331B2 (en) 2006-08-11 2013-11-05 David R. Hall Roof mining drill bit
US7527110B2 (en) 2006-10-13 2009-05-05 Hall David R Percussive drill bit
US20080087473A1 (en) * 2006-10-13 2008-04-17 Hall David R Percussive Drill Bit
US9068410B2 (en) 2006-10-26 2015-06-30 Schlumberger Technology Corporation Dense diamond body
US20080099243A1 (en) * 2006-10-27 2008-05-01 Hall David R Method of Assembling a Drill Bit with a Jack Element
US7954401B2 (en) 2006-10-27 2011-06-07 Schlumberger Technology Corporation Method of assembling a drill bit with a jack element
US7419018B2 (en) 2006-11-01 2008-09-02 Hall David R Cam assembly in a downhole component
WO2008076625A3 (en) * 2006-12-15 2009-02-26 David R Hall System for steering a drill string
US7600586B2 (en) 2006-12-15 2009-10-13 Hall David R System for steering a drill string
US20080156536A1 (en) * 2007-01-03 2008-07-03 Hall David R Apparatus and Method for Vibrating a Drill Bit
US7392857B1 (en) 2007-01-03 2008-07-01 Hall David R Apparatus and method for vibrating a drill bit
USD674422S1 (en) 2007-02-12 2013-01-15 Hall David R Drill bit with a pointed cutting element and a shearing cutting element
USD678368S1 (en) 2007-02-12 2013-03-19 David R. Hall Drill bit with a pointed cutting element
US20110080036A1 (en) * 2007-05-15 2011-04-07 Schlumberger Technology Corporation Spring Loaded Pick
US8342611B2 (en) 2007-05-15 2013-01-01 Schlumberger Technology Corporation Spring loaded pick
US8307919B2 (en) 2007-06-04 2012-11-13 Schlumberger Technology Corporation Clutch for a jack element
US20080296015A1 (en) * 2007-06-04 2008-12-04 Hall David R Clutch for a Jack Element
US7866416B2 (en) 2007-06-04 2011-01-11 Schlumberger Technology Corporation Clutch for a jack element
US20080314647A1 (en) * 2007-06-22 2008-12-25 Hall David R Rotary Drag Bit with Pointed Cutting Elements
US8122980B2 (en) 2007-06-22 2012-02-28 Schlumberger Technology Corporation Rotary drag bit with pointed cutting elements
US7967083B2 (en) 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US8499857B2 (en) 2007-09-06 2013-08-06 Schlumberger Technology Corporation Downhole jack assembly sensor
US7721826B2 (en) 2007-09-06 2010-05-25 Schlumberger Technology Corporation Downhole jack assembly sensor
US20090065251A1 (en) * 2007-09-06 2009-03-12 Hall David R Downhole Jack Assembly Sensor
US20100108385A1 (en) * 2007-09-06 2010-05-06 Hall David R Downhole Jack Assembly Sensor
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US20090273224A1 (en) * 2008-04-30 2009-11-05 Hall David R Layered polycrystalline diamond
US8931854B2 (en) 2008-04-30 2015-01-13 Schlumberger Technology Corporation Layered polycrystalline diamond
US8540037B2 (en) 2008-04-30 2013-09-24 Schlumberger Technology Corporation Layered polycrystalline diamond
US8322796B2 (en) 2009-04-16 2012-12-04 Schlumberger Technology Corporation Seal with contact element for pick shield
US8701799B2 (en) 2009-04-29 2014-04-22 Schlumberger Technology Corporation Drill bit cutter pocket restitution
US20120111557A1 (en) * 2009-06-03 2012-05-10 2K Tools As Landing sub for a wiper
US9341030B2 (en) * 2009-06-03 2016-05-17 2K Tools As Landing sub for a wiper
US20100326740A1 (en) * 2009-06-26 2010-12-30 Hall David R Bonded Assembly Having Low Residual Stress
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
US8839888B2 (en) 2010-04-23 2014-09-23 Schlumberger Technology Corporation Tracking shearing cutters on a fixed bladed drill bit with pointed cutting elements
US8418784B2 (en) 2010-05-11 2013-04-16 David R. Hall Central cutting region of a drilling head assembly
US8333254B2 (en) 2010-10-01 2012-12-18 Hall David R Steering mechanism with a ring disposed about an outer diameter of a drill bit and method for drilling
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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