US1183630A - Underreamer. - Google Patents

Underreamer. Download PDF

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Publication number
US1183630A
US1183630A US3693715A US3693715A US1183630A US 1183630 A US1183630 A US 1183630A US 3693715 A US3693715 A US 3693715A US 3693715 A US3693715 A US 3693715A US 1183630 A US1183630 A US 1183630A
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United States
Prior art keywords
shank
cutters
recess
weighted
well
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Expired - Lifetime
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US3693715A
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Charles R Bryson
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Charles R Bryson
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Application status is Expired - Lifetime legal-status Critical

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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
    • E21B10/26Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers
    • E21B10/32Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools
    • E21B10/34Drill bits with leading portion, i.e. drill bits with a pilot cutter; Drill bits for enlarging the borehole, e.g. reamers with expansible cutting tools of roller-cutter type

Description

C. BRYSON.

UNDERBEAMER.

APPLICATION FILE!) JUNE 29. I915.

Patented May 16, 1916.

WITNESSES enemas 11. season, or rrrr'snonen, rnnnsrnvnnra UNDERREAMER.

meaeso. specification of Letters n {Patented May is, rare. Application filed June 29, 1915. Serial No. 36,937. v

To all whom it mam/concern Be it known that 1, CHARLES R. BRYSON, a citizen of the UnitedStates, residing at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Underrearners, of which improvement the following 1s a specification. I 0

My invention relates to improvements 1n under reamers.

The objects of my invention are toproduce 'a device adapted to enlarge the diameter of the drill hole-or well below the casing, without the necessity of withdrawing the casing, which device is simple 1n construction and operationwhile at the same time possessing great strength and durability to meet the requirements of deep well under reaming. These objects I accomplish by means of the device hereinafter more specifically described, reference belng had to theaccompanying drawings, forming part hereof, in which Figure l is a side elevation partly broken away to show the operative parts, the cutters being in operative posltlon. Fig. 2 1s a side elevation partly broken away, showing the device in position to be lowered into the well. Figs. 3 and 4 are details of the spring supporting plug. Fig. 5 is a fragmentary view of cutter and spring, showing spring plug on upper end of cutter. Fig. 6 is a plan View of the devlce. Fig. 7 is a section on the line 77 of, Fig. l.

- Referring to said drawings, 1, is the bit shank, which is formed by forging in the usual-manner, and is provided with a suitable recess or opening a for the reception of the cutters, 2, and socket 1), extending from said recess a, for the enlarged upper end of the weighted shank 3, and for the spring 4, the upper end of which is secured in the top of said recess and the lower end thereof to the top of said shank 3. The lower edges of the bit shank against which the upper edges of the cutters engage are tapered correspondingly with the upper edges of said cutters, in order to furnish a bearing or support for the cutters on the downward stroke of the under rearner. The bit shank is also provided with screw threaded openings 5,. for the reception of the correspondingly threaded spring plugs 6, which hold the cutter springs in operative position.

The cutters 2 are preferably formed of tool steel as shown, and are pivotally supported in the bit shank by the pins 7 The upper ends 8 of the cutters are angularly shaped to conform to the lower squaredsides 9 of the weighted shank 3. The upper squared portion 10 of the weighted shank is of larger cross section than the lower squared portion and is preferably slightly tapered. A ring or collar 11 isformed at the top of the weighted shank to prevent said shank from being pulled enti'rely between the cutters.v A spring 12 is interposed between each of the cutters and the side of the bit shank, and is adapted to force the cutters into operative: position when the knob or weight 13 of the shank 3,

drill hole or well below the casing, the ordi nary drill bit is removed from the string of drilling tools and the under reamer substituted, the parts are adjusted to the position shown in Fig. 2 by inwardly compressing the lower ends of the cutters and thus collapsing the same, then by pulling the shank 3 downward until the end of the upper portion of the weighted shank en-' gages the inner sides of the upper portion of the'cutters, the springs 12 are held compressed, thus holding the cutters in the posi tion shown in Fig. 2. The drilling tools with the under reamer attached are then lowered into the well, and when the knob of the weighted shank strikes the bottom of the well, the said shank is forced upward into the opening in the bit shank, the spring 4 holding said shank suspended contracts and the cutter springs force the upper ends of the cutters to their seat against the lower squared sides of the weighted shank and the cutters are then in position to ream the well below the casing. The under reameris then operated in the-usual manner and the diameter of the well is enlarged as desired and to the depth required.

The string of tools and attached under reamer may be readily withdrawn from the well when desired as the engagement of the sides of the cutters against the casing will tion for reaming the well as soon as they reach the end of the casing.

I claim as my invention and desire to secure by Letters Patent:

1. In an underreamer, the combination of a bit shank having a recess in its lower. end,

a plurality of cutters 'pivotally mounted in said recess, the upper ends of said cutters having vertically disposed recesses therein, a Weighted shank movably seated in said recesses and adapted when in lowered position to hold the cutters in inoperative position, and yielding means adapted to throw the cutters into operative position when said shank-is moved upwardly.

2. In an under reamer, the combination of a bit shank havinga recess in its lower in said recess and yielding means to hold the upper ends of said cutters in contact with said Weighted shank.

3. In an underreamer the combination of a bit shank screw threaded at its upper end, the said shank having a recess in its lower end, a socket extending from said recess longitudinally of said'recess, a plurality of cut-' ters pivotally mounted in said recess, the upperiends thereof forming a squared opening, a Weighted shank movably supported in said socket and seated inthe squared opening of said cutters, and yielding means to hold the cutters in contact with said weighted shank.

In testimony whereof, .I have hereunto signed my name in the presence of two subscribing witnesses.

CHARLES 11.. BRYSON.

In the presence of JAMES C. HERRON, CLARENCE A. WILLIAMS- Y

US3693715A 1915-06-29 1915-06-29 Underreamer. Expired - Lifetime US1183630A (en)

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Cited By (86)

* 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
US2499252A (en) * 1947-12-26 1950-02-28 Gurney L Michael Earth boring tool
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
US2545036A (en) * 1948-08-12 1951-03-13 Archer W Kammerer Expansible drill bit
US2585369A (en) * 1946-11-20 1952-02-12 Stanolind Oil & Gas Co Side-wall sampler
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
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
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
US20080029312A1 (en) * 2006-03-23 2008-02-07 Hall David R Indenting Member for a Drill 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
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
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
US20090183919A1 (en) * 2005-11-21 2009-07-23 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
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
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
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
USD620510S1 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Drill bit
US20100264721A1 (en) * 2009-04-16 2010-10-21 Hall David R Seal with Rigid Element for Degradation Assembly
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
US7900720B2 (en) 2006-01-18 2011-03-08 Schlumberger Technology Corporation Downhole drive shaft connection
US7967083B2 (en) 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
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
US8201892B2 (en) 2006-08-11 2012-06-19 Hall David R Holder assembly
US8215420B2 (en) 2006-08-11 2012-07-10 Schlumberger Technology Corporation Thermally stable pointed diamond with increased impact resistance
US8267196B2 (en) 2005-11-21 2012-09-18 Schlumberger Technology Corporation Flow guide actuation
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
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
US8342611B2 (en) 2007-05-15 2013-01-01 Schlumberger Technology Corporation Spring loaded pick
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
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
US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
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Cited By (137)

* 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
US2585369A (en) * 1946-11-20 1952-02-12 Stanolind Oil & Gas Co Side-wall sampler
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
US2499252A (en) * 1947-12-26 1950-02-28 Gurney L Michael Earth boring tool
US2545036A (en) * 1948-08-12 1951-03-13 Archer W Kammerer Expansible drill bit
US20090158897A1 (en) * 2005-11-21 2009-06-25 Hall David R Jack Element with a Stop-off
US20070114071A1 (en) * 2005-11-21 2007-05-24 Hall David R Rotary Bit with an Indenting Member
US20070114067A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly 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
US20070114065A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly
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
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
US7198119B1 (en) 2005-11-21 2007-04-03 Hall David R Hydraulic drill bit assembly
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
US8950517B2 (en) 2005-11-21 2015-02-10 Schlumberger Technology Corporation Drill bit with a retained jack element
US20070221412A1 (en) * 2005-11-21 2007-09-27 Hall David R Rotary Valve for a Jack Hammer
US8528664B2 (en) 2005-11-21 2013-09-10 Schlumberger Technology Corporation Downhole mechanism
US8522897B2 (en) 2005-11-21 2013-09-03 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US20070272443A1 (en) * 2005-11-21 2007-11-29 Hall David R Downhole Steering
US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
US7328755B2 (en) 2005-11-21 2008-02-12 Hall David R Hydraulic drill bit assembly
US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
US7337858B2 (en) 2005-11-21 2008-03-04 Hall David R Drill bit assembly adapted to provide power downhole
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US7360610B2 (en) 2005-11-21 2008-04-22 Hall David R Drill bit assembly for directional drilling
US8281882B2 (en) 2005-11-21 2012-10-09 Schlumberger Technology Corporation Jack element for a drill bit
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
US8205688B2 (en) 2005-11-21 2012-06-26 Hall David R Lead the bit rotary steerable system
US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
US7398837B2 (en) 2005-11-21 2008-07-15 Hall David R Drill bit assembly with a logging device
US20080173482A1 (en) * 2005-11-21 2008-07-24 Hall David R Drill Bit
US20080179098A1 (en) * 2005-11-21 2008-07-31 Hall David R Drill Bit Assembly for Directional Drilling
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
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
US7641002B2 (en) 2005-11-21 2010-01-05 Hall David R Drill bit
US20080302572A1 (en) * 2005-11-21 2008-12-11 Hall David R Drill Bit Porting System
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer bit
US20090255733A1 (en) * 2005-11-21 2009-10-15 Hall David R Lead the Bit Rotary Steerable System
US7591327B2 (en) 2005-11-21 2009-09-22 Hall David R Drilling at a resonant frequency
US7497279B2 (en) 2005-11-21 2009-03-03 Hall David R Jack element adapted to rotate independent of a drill bit
US20090057016A1 (en) * 2005-11-21 2009-03-05 Hall David R Downhole Turbine
US20090183919A1 (en) * 2005-11-21 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7506701B2 (en) * 2005-11-21 2009-03-24 Hall David R Drill bit assembly for directional drilling
US7559379B2 (en) 2005-11-21 2009-07-14 Hall David R Downhole steering
US7533737B2 (en) 2005-11-21 2009-05-19 Hall David R Jet arrangement for a downhole drill bit
US20070125580A1 (en) * 2005-11-21 2007-06-07 Hall David R Jet Arrangement for a Downhole Drill Bit
US20080156541A1 (en) * 2005-12-22 2008-07-03 Hall David R Downhole Hammer Assembly
US7900720B2 (en) 2006-01-18 2011-03-08 Schlumberger Technology Corporation Downhole drive shaft connection
US20090183920A1 (en) * 2006-03-23 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7762353B2 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Downhole valve mechanism
US7484576B2 (en) 2006-03-23 2009-02-03 Hall David R Jack element in communication with an electric motor and or generator
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
US8316964B2 (en) 2006-03-23 2012-11-27 Schlumberger Technology Corporation Drill bit transducer device
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US8130117B2 (en) 2006-03-23 2012-03-06 Schlumberger Technology Corporation Drill bit with an electrically isolated transmitter
US7661487B2 (en) 2006-03-23 2010-02-16 Hall David R Downhole percussive tool with alternating pressure differentials
US8360174B2 (en) 2006-03-23 2013-01-29 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US7419016B2 (en) 2006-03-23 2008-09-02 Hall David R Bi-center drill bit
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US20070221406A1 (en) * 2006-03-24 2007-09-27 Hall David R Jack Element for a Drill Bit
US8590644B2 (en) 2006-08-11 2013-11-26 Schlumberger Technology Corporation Downhole drill bit
US8596381B2 (en) 2006-08-11 2013-12-03 David R. Hall Sensor on a formation engaging member of a drill bit
US20110042150A1 (en) * 2006-08-11 2011-02-24 Hall David R Roof Mining Drill Bit
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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
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US8434573B2 (en) 2006-08-11 2013-05-07 Schlumberger Technology Corporation Degradation assembly
US20100089648A1 (en) * 2006-08-11 2010-04-15 Hall David R Fixed Bladed Bit that Shifts Weight between an Indenter and Cutting Elements
US20100059289A1 (en) * 2006-08-11 2010-03-11 Hall David R Cutting Element with Low Metal Concentration
US20090000828A1 (en) * 2006-08-11 2009-01-01 Hall David R Roof Bolt Bit
US8191651B2 (en) 2006-08-11 2012-06-05 Hall David R Sensor on a formation engaging member of a drill bit
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USD678368S1 (en) 2007-02-12 2013-03-19 David R. Hall Drill bit with a pointed cutting element
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US20080296015A1 (en) * 2007-06-04 2008-12-04 Hall David R Clutch for a Jack Element
US8122980B2 (en) 2007-06-22 2012-02-28 Schlumberger Technology Corporation Rotary drag bit with pointed cutting elements
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US20090065251A1 (en) * 2007-09-06 2009-03-12 Hall David R Downhole Jack Assembly Sensor
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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
US8540037B2 (en) 2008-04-30 2013-09-24 Schlumberger Technology Corporation Layered polycrystalline diamond
US8931854B2 (en) 2008-04-30 2015-01-13 Schlumberger Technology Corporation Layered polycrystalline diamond
US20100264721A1 (en) * 2009-04-16 2010-10-21 Hall David R Seal with Rigid Element for Degradation Assembly
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
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
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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