US3126067A - Roller bit with inserts - Google Patents

Roller bit with inserts Download PDF

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Publication number
US3126067A
US3126067A US3126067DA US3126067A US 3126067 A US3126067 A US 3126067A US 3126067D A US3126067D A US 3126067DA US 3126067 A US3126067 A US 3126067A
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teeth
bit
inserts
roller
rows
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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
    • E21B10/46Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/50Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
    • E21B10/52Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type with chisel or button type inserts
    • 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
    • E21B10/16Roller bits characterised by tooth form or arrangement

Description

March 24, 1964 P. w. SCHUMACHER, JR 3, 26 I ROLLER BIT WITH INSERTS Filed March 12, 1959 2 Sheets-Sheet 1 Percy 14 Jcfiu/rmc/fer, d/n

' IN V EN TOR.

A770 IVEKS March 24, 1964 P. W. SCHUMACHER, JR

ROLLER BIT WITH INSERTS 2 Sheets-Sheet 2' Filed March 12, 1959 INVENTOR ,1, h j WWW ATTORNEYS United States Patent Office 3,126,067. Patented Mar. 24, 1964 3,126,067 ROLLER BIT WITH INSERTS Percy W. Schumacher, In, Houston, Tex., assignor to Reed Roller Bit Company, Houston, Tex., a corporation of Texas Filed Mar. 12, 1959, Ser. No. 799,041 4 Claims. (Cl. 175-374) This invention relates generally to drill bits and more particularly to roller bits for deep well drilling.

One of the general objects of the invention is to provide a new and improved drill that will more eiiiciently drill hard and medium-hard formations.

Another object of the invention is to provide a new and improved roller cutter wherein the cutting elements thereon are particularly adapted in drilling formations containing hard streaks, non-uniform or unconsolidated formations.

Another object is to provide a drill bit roller having a unique arrangement of steel teeth and hard metal inserts.

Other objects and advantages of the invention will become apparent from the following description and the accompanying drawings wherein is set forth by way of example an embodiment of the invention.

FIG. 1 is a bottom plan view of a cone type bit embodying the invention.

FIG. 2 is a side elevation view of the bit shown in FIG. 1.

FIG. 3 is a sectional view taken on the line 33 of FIG. 1 through a cone type roller cutter embodying the invention.

FIG. 4 is a fragmentary sectional view taken along line 44 of FIG. 3.

Referring to FIGS. 1 and 2 a cone type roller bit is shown embodying a number of conventional parts and the new and improved roller cutters provided by the invention. In these figures, a bit head 1 has the usual hollow threaded shank 2 by which the bit may be secured to the lower end of a drill stern (not shown). The bit head 1 has rotatably mounted therein roller cutters 3, 4 and 5. The roller cutter 3 has intermediate rows of teeth, or cutting elements, 6 and 7, and a gage row of teeth 8. The cutter 3 also has a spear point 9 to drill the earth formation at and adjacent to the longitudinal axis of the bit.

The roller cutter 4 has intermediate rows of teeth or cutting elements, 10 and 11, and a gage row of teeth 12.

The roller cutter has intermediate rows of teeth 13, 14 and 15, and a gage row of teeth 16.

The cutting elements of the cutters 3, 4 and 5 are constructed and arranged to cooperate in removing the formation from the entire bottom of the hole being drilled.

In operation, a drill bit is attached to the lower end of a drill stem (not shown), and rotated about the 1ongitudinal axis of the drill bit upon the bottom of a bore hole. Thus, the cutters are caused to rotate, and as weight is applied to the bit by the weight of the drill stem, the teeth, or cutting elements, of the rollers will crush, chip or scrape the formation upon which the bit is rotated. The particles of formation thus dislodged will be carried out of the bore hole by drilling fluid which is pumped downwardly through the drill stem and bit head, returning to the surface of the earth in the space between the drill stem and the wall of the bore hole being drilled.

The roller cutters of the invention are similar in operation and construction, so that a description of one will describe the others.

Referring to FIG. 2, the roller cutter 3 has circumferential rows of cutting elements 6, 7 and 8 on the body portion 23, and a spear point 9. The rows of cutting elements are similarly constructed. For example, the gage row of cutting elements 8 of the cutter 3 comprises spaced steel teeth 17 having circumferentially extending cutting crests. Substantially cylindrical hard metal inserts 18 are mounted in the cutter between adjacent ends of the teeth 17. The row of cutting elements 7 comprises spaced steel teeth 22 having circumferentially extending crests. Hard metal inserts 18 are mounted in the cutter between adjacent ends of the teeth 22.

Referring to FIGS. 3 and 4, the roller cutter 3 is shown with the rows of cutting elements 6, 7 and 8, and the spear point 9. The row of cutting elements 6 comprises spaced teeth 19 having circumferentially extending crests. The cutter 3 has sockets 20 between the adjacent ends of the teeth 19. Hard metal inserts 18 are pressed, or otherwise secured, in the sockets 29. The teeth 19 extend radially beyond the outer ends of the hard metal inserts 18 in the same row, as is shown in FIG. 4.

The spear point 9, which drills the formation at and near the center of the hole, has sockets 21 and hard metal inserts 18 secured therein.

In operation, the steel teeth 17, 19 and 22 will engage the formation first since they extend radially beyond the inserts 18 in the same rows. Thus, if the formation is susceptible of being drilled by the steel teeth 17, 19 and 22, the bit will progress in the usual manner. The steel of which the teeth are made may be the carburized steel commonly used in the teeth of rock bits. If the bit should encounter extremely hard and abrasive formations, the steel teeth 17, 19 and 22 would be abraded away, whereupon the hard metal inserts 18, which usually are made with sintered tungsten carbide or other wear-resistant materials, would then engage the hard formation to crush or chip the same. In other Words, the bit of the invention will drill formations normally drilled with bits employing only steel teeth; however, if the steel teeth on the cutters of this invention should be abraded away by hard abrasive formations, the wear-resistant hard metal inserts will then be exposed to crush this hard formation as the bit is rotated.

In field use, this bit has found particular utility in areas where the formation structure is unknown or of uncertain composition and thickness, or in areas where alternate streaks or beds of formation of varying hardness and abrasiveness are encountered.

This invention is not limited to the embodiment shown. Various changes within the scope of the following claims will occur to those skilled in the art.

I claim:

1. A drill bit having a head and a plurality of substantially conical roller cutters rotatably mounted in said head, each of the said roller cutters having circumferential rows of cutting elements thereon, each of the said rows of cutting elements comprising spaced teeth having circumferentially extending cutting crests, and substantially cylindrical wear-resistant inserts mounted in each of the said rows between adjacent ends of the said cutting crests, the said cutting crests extending radially beyond the outer ends of the said inserts.

2. A roller cutter comprising a body, circumferential rows of teeth on the said body, each of the said rows comprising spaced teeth having circumferentially extending crests, and cylindrical hard metal inserts in said body between said spaced teeth, the said spaced teeth extending radially beyond the outer ends of the said hard metal inserts.

3. A roller cutter comprising a body, circumferential rows of cutting elements on said body, each of the said rows of cutting elements comprising spaced teeth having circumferentially extending crests, the said body having sockets between adjacent ends of said teeth, and cylindrical hard metal inserts secured in the said sockets, the

outer ends of the said hard metal inserts protruding from References Cited in the file of this patent the said cutter body, and the said spaced teeth extending radially beyond the outer ends of the said hard metal in- UNITED STATES PATENTS 1,143,272 Hughes June 15, 1915 4. A roller cutter comprising a body, circumferential 5 1,556,022 10, 1923 rows of teeth on the said body, each of the said rows com- 1,340,390 Failing 12, 1932 prising spaced teeth having circumferentially extending 2,255,435 Newton P 1941 crests, and cylindrical wear-resistant inserts in said body 2,634,105 Gruner Apr. 7, 1953 between adjacent ends of the said spaced teeth, the said 2,774,571 Morlan Dec. 18, 1956 spaced teeth extending radially beyond the outer ends of 10 2,804,282 Spengler Aug. 27, 1957 the said Wear-resistant inserts. 2,833,520 Owen May 6, 1958

Claims (1)

  1. 2. A ROLLER CUTTER COMPRISING A BODY, CIRCUMFERENTIAL ROWS OF TEETH ON THE SAID BODY, EACH OF THE SAID ROWS COMPRISING SPACED TEETH HAVING CIRCUMFERENTIALLY EXTENDING CRESTS, AND CYLINDRICAL HARD METAL INSERTS IN SAID BODY BETWEEN SAID SPACED TEETH, THE SAID SPACED TEETH EXTENDING RADIALLY BEYOND THE OUTER ENDS OF THE SAID HARD METAL INSERTS.
US3126067A Roller bit with inserts Expired - Lifetime US3126067A (en)

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Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385385A (en) * 1966-04-01 1968-05-28 Reed Roller Bit Co Drill bit
US3401759A (en) * 1966-10-12 1968-09-17 Hughes Tool Co Heel pack rock bit
US3442342A (en) * 1967-07-06 1969-05-06 Hughes Tool Co Specially shaped inserts for compact rock bits,and rolling cutters and rock bits using such inserts
US3786879A (en) * 1973-03-09 1974-01-22 Reed Tool Co Drill bit
US3952815A (en) * 1975-03-24 1976-04-27 Dresser Industries, Inc. Land erosion protection on a rock cutter
US4202419A (en) * 1979-01-11 1980-05-13 Dresser Industries, Inc. Roller cutter with major and minor insert rows
US4262761A (en) * 1979-10-05 1981-04-21 Dresser Industries, Inc. Long-life milled tooth cutting structure
US4343372A (en) * 1980-06-23 1982-08-10 Hughes Tool Company Gage row structure of an earth boring drill bit
US4940099A (en) * 1989-04-05 1990-07-10 Reed Tool Company Cutting elements for roller cutter drill bits
US5636700A (en) * 1995-01-03 1997-06-10 Dresser Industries, Inc. Roller cone rock bit having improved cutter gauge face surface compacts and a method of construction
US5695019A (en) * 1995-08-23 1997-12-09 Dresser Industries, Inc. Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts
US5709278A (en) * 1996-01-22 1998-01-20 Dresser Industries, Inc. Rotary cone drill bit with contoured inserts and compacts
US5722497A (en) * 1996-03-21 1998-03-03 Dresser Industries, Inc. Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces
US5839526A (en) * 1997-04-04 1998-11-24 Smith International, Inc. Rolling cone steel tooth bit with enhancements in cutter shape and placement
US5868213A (en) * 1997-04-04 1999-02-09 Smith International, Inc. Steel tooth cutter element with gage facing knee
US5881829A (en) * 1997-07-16 1999-03-16 Baker Hughes Incorporated Rolling-cutter mining bit with relatively soft formation cutting structure
US5915486A (en) * 1996-06-21 1999-06-29 Smith International, Inc. Cutter element adapted to withstand tensile stress
US6029759A (en) * 1997-04-04 2000-02-29 Smith International, Inc. Hardfacing on steel tooth cutter element
US6116359A (en) * 1997-03-17 2000-09-12 Baker Hughes Inc. Tri-cone kerf gage
US20040084222A1 (en) * 2001-11-01 2004-05-06 Klompenburg Greg Van Alternating inclinations of compacts for drill bit
US20090126998A1 (en) * 2007-11-16 2009-05-21 Zahradnik Anton F Hybrid drill bit and design method
US20100025119A1 (en) * 2007-04-05 2010-02-04 Baker Hughes Incorporated Hybrid drill bit and method of using tsp or mosaic cutters on a hybrid bit
US20100155146A1 (en) * 2008-12-19 2010-06-24 Baker Hughes Incorporated Hybrid drill bit with high pilot-to-journal diameter ratio
US20100224417A1 (en) * 2009-03-03 2010-09-09 Baker Hughes Incorporated Hybrid drill bit with high bearing pin angles
US20100288561A1 (en) * 2009-05-13 2010-11-18 Baker Hughes Incorporated Hybrid drill bit
US20100320001A1 (en) * 2009-06-18 2010-12-23 Baker Hughes Incorporated Hybrid bit with variable exposure
US20110031021A1 (en) * 2009-08-07 2011-02-10 Baker Hughes Incorporated Anti-Tracking Spear Points for Earth-Boring Drill Bits
US20110079440A1 (en) * 2009-10-06 2011-04-07 Baker Hughes Incorporated Hole opener with hybrid reaming section
US20110079444A1 (en) * 2009-09-16 2011-04-07 Baker Hughes Incorporated External, Divorced PDC Bearing Assemblies for Hybrid Drill Bits
US20110120269A1 (en) * 2008-05-02 2011-05-26 Baker Hughes Incorporated Modular hybrid drill bit
US20110168452A1 (en) * 2008-08-14 2011-07-14 Baker Hughes Incorporated Tungsten Carbide Bit with Hardfaced Nose Area
WO2014078225A3 (en) * 2012-11-16 2014-11-27 National Oilwell DHT, L.P. Hybrid rolling cone drill bits and methods for manufacturing same
US8950514B2 (en) 2010-06-29 2015-02-10 Baker Hughes Incorporated Drill bits with anti-tracking features
US8978786B2 (en) 2010-11-04 2015-03-17 Baker Hughes Incorporated System and method for adjusting roller cone profile on hybrid bit
US9353575B2 (en) 2011-11-15 2016-05-31 Baker Hughes Incorporated Hybrid drill bits having increased drilling efficiency
US9476259B2 (en) 2008-05-02 2016-10-25 Baker Hughes Incorporated System and method for leg retention on hybrid bits
WO2017139717A1 (en) * 2016-02-12 2017-08-17 Hijet Bit LLC Drill bit for milling composite plugs
US9782857B2 (en) 2011-02-11 2017-10-10 Baker Hughes Incorporated Hybrid drill bit having increased service life
US10107039B2 (en) 2014-05-23 2018-10-23 Baker Hughes Incorporated Hybrid bit with mechanically attached roller cone elements
US10113365B2 (en) * 2016-02-12 2018-10-30 Hijet Bit LLC Drill bit for milling composite plugs

Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1143272A (en) * 1914-02-24 1915-06-15 Sharp Hughes Tool Company Rotary boring-drill.
US1656022A (en) * 1926-12-27 1928-01-10 Scott Supreme Oil Tool Company Rotary disk
US1840390A (en) * 1930-07-28 1932-01-12 Garber Tool Company Rock bit cone
US2255435A (en) * 1940-10-08 1941-09-09 Max A Newton Well bit
US2634105A (en) * 1949-11-25 1953-04-07 Gruner Hans Drilling bit
US2774571A (en) * 1954-07-06 1956-12-18 Hughes Tool Co Cone type well drill
US2804282A (en) * 1954-10-11 1957-08-27 Jr Arthur F Spengler Boring drill
US2833520A (en) * 1957-01-07 1958-05-06 Robert G Owen Annular mill for use in oil wells

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1143272A (en) * 1914-02-24 1915-06-15 Sharp Hughes Tool Company Rotary boring-drill.
US1656022A (en) * 1926-12-27 1928-01-10 Scott Supreme Oil Tool Company Rotary disk
US1840390A (en) * 1930-07-28 1932-01-12 Garber Tool Company Rock bit cone
US2255435A (en) * 1940-10-08 1941-09-09 Max A Newton Well bit
US2634105A (en) * 1949-11-25 1953-04-07 Gruner Hans Drilling bit
US2774571A (en) * 1954-07-06 1956-12-18 Hughes Tool Co Cone type well drill
US2804282A (en) * 1954-10-11 1957-08-27 Jr Arthur F Spengler Boring drill
US2833520A (en) * 1957-01-07 1958-05-06 Robert G Owen Annular mill for use in oil wells

Cited By (61)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3385385A (en) * 1966-04-01 1968-05-28 Reed Roller Bit Co Drill bit
US3401759A (en) * 1966-10-12 1968-09-17 Hughes Tool Co Heel pack rock bit
US3442342A (en) * 1967-07-06 1969-05-06 Hughes Tool Co Specially shaped inserts for compact rock bits,and rolling cutters and rock bits using such inserts
US3786879A (en) * 1973-03-09 1974-01-22 Reed Tool Co Drill bit
US3952815A (en) * 1975-03-24 1976-04-27 Dresser Industries, Inc. Land erosion protection on a rock cutter
FR2305581A1 (en) * 1975-03-24 1976-10-22 Dresser Ind Protection against erosion of the bearing surfaces of a drill bit dial to rock
US4202419A (en) * 1979-01-11 1980-05-13 Dresser Industries, Inc. Roller cutter with major and minor insert rows
US4262761A (en) * 1979-10-05 1981-04-21 Dresser Industries, Inc. Long-life milled tooth cutting structure
US4343372A (en) * 1980-06-23 1982-08-10 Hughes Tool Company Gage row structure of an earth boring drill bit
US4940099A (en) * 1989-04-05 1990-07-10 Reed Tool Company Cutting elements for roller cutter drill bits
US5636700A (en) * 1995-01-03 1997-06-10 Dresser Industries, Inc. Roller cone rock bit having improved cutter gauge face surface compacts and a method of construction
US5695019A (en) * 1995-08-23 1997-12-09 Dresser Industries, Inc. Rotary cone drill bit with truncated rolling cone cutters and dome area cutter inserts
US5709278A (en) * 1996-01-22 1998-01-20 Dresser Industries, Inc. Rotary cone drill bit with contoured inserts and compacts
US5722497A (en) * 1996-03-21 1998-03-03 Dresser Industries, Inc. Roller cone gage surface cutting elements with multiple ultra hard cutting surfaces
US5915486A (en) * 1996-06-21 1999-06-29 Smith International, Inc. Cutter element adapted to withstand tensile stress
US6116359A (en) * 1997-03-17 2000-09-12 Baker Hughes Inc. Tri-cone kerf gage
US5839526A (en) * 1997-04-04 1998-11-24 Smith International, Inc. Rolling cone steel tooth bit with enhancements in cutter shape and placement
US5868213A (en) * 1997-04-04 1999-02-09 Smith International, Inc. Steel tooth cutter element with gage facing knee
US6029759A (en) * 1997-04-04 2000-02-29 Smith International, Inc. Hardfacing on steel tooth cutter element
US5881829A (en) * 1997-07-16 1999-03-16 Baker Hughes Incorporated Rolling-cutter mining bit with relatively soft formation cutting structure
US7096981B2 (en) * 2001-11-01 2006-08-29 Baker Hughes Incorporated Alternating inclinations of compacts for drill bit
US20040084222A1 (en) * 2001-11-01 2004-05-06 Klompenburg Greg Van Alternating inclinations of compacts for drill bit
US20100025119A1 (en) * 2007-04-05 2010-02-04 Baker Hughes Incorporated Hybrid drill bit and method of using tsp or mosaic cutters on a hybrid bit
US20090126998A1 (en) * 2007-11-16 2009-05-21 Zahradnik Anton F Hybrid drill bit and design method
US8678111B2 (en) 2007-11-16 2014-03-25 Baker Hughes Incorporated Hybrid drill bit and design method
US20110120269A1 (en) * 2008-05-02 2011-05-26 Baker Hughes Incorporated Modular hybrid drill bit
US9476259B2 (en) 2008-05-02 2016-10-25 Baker Hughes Incorporated System and method for leg retention on hybrid bits
US8356398B2 (en) 2008-05-02 2013-01-22 Baker Hughes Incorporated Modular hybrid drill bit
US20110168452A1 (en) * 2008-08-14 2011-07-14 Baker Hughes Incorporated Tungsten Carbide Bit with Hardfaced Nose Area
US20100155146A1 (en) * 2008-12-19 2010-06-24 Baker Hughes Incorporated Hybrid drill bit with high pilot-to-journal diameter ratio
US8141664B2 (en) 2009-03-03 2012-03-27 Baker Hughes Incorporated Hybrid drill bit with high bearing pin angles
US20100224417A1 (en) * 2009-03-03 2010-09-09 Baker Hughes Incorporated Hybrid drill bit with high bearing pin angles
US20100288561A1 (en) * 2009-05-13 2010-11-18 Baker Hughes Incorporated Hybrid drill bit
US9670736B2 (en) 2009-05-13 2017-06-06 Baker Hughes Incorporated Hybrid drill bit
US8459378B2 (en) 2009-05-13 2013-06-11 Baker Hughes Incorporated Hybrid drill bit
US20100320001A1 (en) * 2009-06-18 2010-12-23 Baker Hughes Incorporated Hybrid bit with variable exposure
US8157026B2 (en) 2009-06-18 2012-04-17 Baker Hughes Incorporated Hybrid bit with variable exposure
US8336646B2 (en) 2009-06-18 2012-12-25 Baker Hughes Incorporated Hybrid bit with variable exposure
US20110031021A1 (en) * 2009-08-07 2011-02-10 Baker Hughes Incorporated Anti-Tracking Spear Points for Earth-Boring Drill Bits
US8579051B2 (en) * 2009-08-07 2013-11-12 Baker Hughes Incorporated Anti-tracking spear points for earth-boring drill bits
US9004198B2 (en) 2009-09-16 2015-04-14 Baker Hughes Incorporated External, divorced PDC bearing assemblies for hybrid drill bits
US9556681B2 (en) 2009-09-16 2017-01-31 Baker Hughes Incorporated External, divorced PDC bearing assemblies for hybrid drill bits
US9982488B2 (en) 2009-09-16 2018-05-29 Baker Hughes Incorporated External, divorced PDC bearing assemblies for hybrid drill bits
US20110079444A1 (en) * 2009-09-16 2011-04-07 Baker Hughes Incorporated External, Divorced PDC Bearing Assemblies for Hybrid Drill Bits
US20110079441A1 (en) * 2009-10-06 2011-04-07 Baker Hughes Incorporated Hole opener with hybrid reaming section
US20110079440A1 (en) * 2009-10-06 2011-04-07 Baker Hughes Incorporated Hole opener with hybrid reaming section
US8191635B2 (en) 2009-10-06 2012-06-05 Baker Hughes Incorporated Hole opener with hybrid reaming section
US8347989B2 (en) 2009-10-06 2013-01-08 Baker Hughes Incorporated Hole opener with hybrid reaming section and method of making
US9657527B2 (en) 2010-06-29 2017-05-23 Baker Hughes Incorporated Drill bits with anti-tracking features
US8950514B2 (en) 2010-06-29 2015-02-10 Baker Hughes Incorporated Drill bits with anti-tracking features
US8978786B2 (en) 2010-11-04 2015-03-17 Baker Hughes Incorporated System and method for adjusting roller cone profile on hybrid bit
US9782857B2 (en) 2011-02-11 2017-10-10 Baker Hughes Incorporated Hybrid drill bit having increased service life
US10072462B2 (en) 2011-11-15 2018-09-11 Baker Hughes Incorporated Hybrid drill bits
US9353575B2 (en) 2011-11-15 2016-05-31 Baker Hughes Incorporated Hybrid drill bits having increased drilling efficiency
US9840874B2 (en) 2012-11-16 2017-12-12 National Oilwell DHT, L.P. Hybrid rolling cone drill bits and methods for manufacturing same
US9249628B2 (en) 2012-11-16 2016-02-02 National Oilwell DHT, L.P. Hybrid rolling cone drill bits and methods for manufacturing same
WO2014078225A3 (en) * 2012-11-16 2014-11-27 National Oilwell DHT, L.P. Hybrid rolling cone drill bits and methods for manufacturing same
US10107039B2 (en) 2014-05-23 2018-10-23 Baker Hughes Incorporated Hybrid bit with mechanically attached roller cone elements
US20170234074A1 (en) * 2016-02-12 2017-08-17 Hijet Bit LLC Drill Bit for Milling Composite Plugs
US10113365B2 (en) * 2016-02-12 2018-10-30 Hijet Bit LLC Drill bit for milling composite plugs
WO2017139717A1 (en) * 2016-02-12 2017-08-17 Hijet Bit LLC Drill bit for milling composite plugs

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