WO2022191888A1 - Fixed cutter rock bit with rotating cutter inserts - Google Patents

Fixed cutter rock bit with rotating cutter inserts Download PDF

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Publication number
WO2022191888A1
WO2022191888A1 PCT/US2021/062981 US2021062981W WO2022191888A1 WO 2022191888 A1 WO2022191888 A1 WO 2022191888A1 US 2021062981 W US2021062981 W US 2021062981W WO 2022191888 A1 WO2022191888 A1 WO 2022191888A1
Authority
WO
WIPO (PCT)
Prior art keywords
cutter
dowel
inserts
mounting holes
cutting
Prior art date
Application number
PCT/US2021/062981
Other languages
French (fr)
Inventor
Nam Duy Nguyen
Original Assignee
Nam Duy Nguyen
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Nam Duy Nguyen filed Critical Nam Duy Nguyen
Publication of WO2022191888A1 publication Critical patent/WO2022191888A1/en

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/42—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits
    • E21B10/43—Rotary drag type drill bits with teeth, blades or like cutting elements, e.g. fork-type bits, fish tail bits characterised by the arrangement of teeth or other cutting elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/60—Drill bits characterised by conduits or nozzles for drilling fluids
    • E21B10/602—Drill bits characterised by conduits or nozzles for drilling fluids the bit being a rotary drag type bit with blades
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/62—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable
    • E21B10/627—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements
    • E21B10/633—Drill bits characterised by parts, e.g. cutting elements, which are detachable or adjustable with plural detachable cutting elements independently detachable
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH DRILLING; MINING
    • E21C—MINING OR QUARRYING
    • E21C35/00—Details of, or accessories for, machines for slitting or completely freeing the mineral from the seam, not provided for in groups E21C25/00 - E21C33/00, E21C37/00 or E21C39/00
    • E21C35/18—Mining picks; Holders therefor
    • E21C35/19—Means for fixing picks or holders
    • E21C35/193—Means for fixing picks or holders using bolts as main fixing elements

Definitions

  • the present invention relates in general to rock bits for rotary drilling, and in particular to fixed cutter rock bits having cutter inserts.
  • Rock bits have been used for drilling into earth formations.
  • One type of rock bits are Klaw type drill bits which are fixed cutter rock bits having cutter inserts which extend from a cutting head and are fixed in position so they do not move.
  • These type rock bits typically have a number of carbide cutter inserts, each with a cutter tip which extends outward from the bit body in a direction of travel.
  • the cutter inserts are mounted in holes and held in the mounting holes by welding the rearward end of the cutter inserts through knock-out holes located in an inward end of the mounting holes, such that the cutter inserts do not rotate within the mounting holes. Due to the geometry of the rock bits, the cutter inserts which are fixed in position will wear on one side during normal use.
  • a novel cutter rock bit which provides a Klaw bit having cutter inserts with cutting tips and intermediate portions which protrude outward from a bit body.
  • the bit body has a pin end, a cutting head, an intermediate portion extending between the cutting head and the pin end, and a central bore extending through the pin end, the intermediate portion and into the cutting head.
  • the cutting head has a plurality of blades with cutting and debris channels extending between the blades. Flow ports extend from the central bore to the cutting and debris channels.
  • the blades define end faces and shoulders, and provide bosses into which extend cutter mounting holes and dowel pin holes. The blades extend from a central portion of the cutting head, outward toward the shoulders in a spiral pattern.
  • the cutter mounting holes extend in directions along general lines of travel of the cutter head.
  • the dowel pin holes extend transverse to corresponding ones of the cutter mounting holes.
  • the cutter inserts each have a cutting tip formed of carbide, a barrel, a dowel recess, an end flange, and a cutter axis which extends from the cutting tip through the end flange.
  • the cutter inserts and the cutter mounting holes are adapted for aligning the cutter axes in the general direction of travel of the cutting head.
  • the dowel pins have a shank which defines a central axis disposed in coaxial relation therewith.
  • the dowel pins and the dowel pin holes are adapted for aligning the dowel pins in transverse relation to the cutter inserts such that the central axes of the dowel pins are disposed transverse to the cutter axes and the dowel pins extend within the dowel recesses of the cutter inserts and retain the cutter inserts within the cutter mounting holes, with the cutter inserts being rotatable about respective ones of the cutter axes.
  • the dowel pins are welded within respective ones of the dowel pin holes.
  • FIGS. 1 through 6 show various aspects for a fixed cutter rock bit made according to the present disclosure, as set forth below:
  • FIG. 1 is a perspective view of a fixed cutter rock bit having rotating cutter inserts
  • FIG. 2 is a bottom view of the fixed cutter rock bit
  • FIG. 3 is a section view of the fixed cutter rock bit, taken along Section Line 3-3 of FIG. 2;
  • FIG. 4 is an exploded, perspective view of the fixed cutter rock bit showing the bit body and flow nozzles;
  • FIG. 5 is an exploded, perspective view of the fixed cutter rock bit showing the bit body and cutter inserts.
  • FIG. 6 is an exploded, perspective view of one of the cutter inserts and two dowel pins.
  • FIG. 1 is a perspective view of a fixed cutter rock bit 12 having a bit body 14, which includes a pin end 16, a cutting head 18, and an intermediate portion 20 connecting between the pin end 16 and the cutting head 18.
  • a central bore 22 (shown in FIG. 3) extends longitudinally through the pin end 16, the intermediate portion 20, and into the cutting head 18 providing a flow passage.
  • the cutting head 18 has end faces 24 and shoulders 26 which are milled to define blades 28, 30, and cuttings and debris channels 32.
  • the blades 28 and 30 are rib-like protrusions with the end faces 24 which radially extend in substantially transverse relation to a longitudinal axis 46 of the bit body 14.
  • the shoulders 26 are the outwardly lateral facing sides of the blades 28 and 30 which preferably extend substantially parallel to the longitudinal axis 46.
  • Flow ports 34 extend between the central bore 22 and the channels 32 for passing drilling fluid through the bit body and into the channels 32.
  • Nozzles 36 are mounted in the flow ports 34 and have orifices for metering drilling fluid flow from the central bore 22.
  • the drilling fluid may be provided as a liquid, as a gas, such as air, or a mixture thereof.
  • the blades 28 are preferably of a larger size than the blades 30.
  • Cutter inserts 38 are mounted in cutter mounting holes 40 which are preferably formed into the respective ones of the end faces 24.
  • Cutter inserts 42 are mounted in cutter mounting holes 44 which are preferably formed into the shoulders 26 along the sides of the blades 28 and 30.
  • the cutter mounting holes 40 and 44 are preferably blind holes, having only outward open ends into which the cutter inserts 38 and 42 are mounted and two intersecting dowel pin holes 48.
  • a single dowel pin hole 48 may be utilized with either a single rigid dowel pin or a dowel pin which will flex around a curve.
  • two rigid dowel pins 50 are used.
  • FIG. 2 is a bottom view and FIG. 3 is a section view, taken along Section Line 3-3 of FIG.
  • the blades 28 and 30 provide bosses in which extend the cutter mounting holes 40 and 44, and the dowel pin holes 48.
  • the blades 28 and 30 extend from a central portion of the cutting head 18, outward towards the shoulders 26 in a spiral pattern.
  • the central bore 22 is shown extending through the pin end 16, the intermediate portion 20, and into the cutting head 18.
  • Flow ports 34 are shown extending from the central bore 22, through the cutting head 18, and into the cutting and debris channels 32.
  • the nozzles 36 are disposed in the flow ports and have orifices to control the flow such that it will pass evenly through each of the nozzles 36.
  • One of cutter inserts 38 is shown with a cutter axis 62 which is at an angle 64 to the longitudinal axis 46 of the bit body 14. The angle 64 will preferably range from thirty to sixty degrees.
  • the cutter inserts 42 located in shoulders 26 of the blades 28 and 30 are also preferably aligned at the same angle 64 as the cutter inserts 38.
  • FIG. 4 is an exploded, perspective view of the fixed cutter rock bit 12 showing the bit body 14 and flow nozzles 36.
  • the flow nozzles 36 are shown displaced equal distances from the position in which they are located when installed in the flow ports 34.
  • the flow ports 34 are preferably drilled and tapped and the lower ends of the flow nozzles are threaded for threadingly securing the flow nozzles 36 within the flow ports 34.
  • there are seven flow nozzles 36 which fit into the seven flow ports 34 shown in FIG. 2. Longitudinal section views of four of the flow nozzles 36 are shown in FIG. 3, and flow paths through the nozzles 36 can be seen tapering to smaller internal diameters in conventional fashion.
  • FIG. 5 is an exploded, perspective view of the fixed cutter rock bit 12 showing the bit body 14, one cutter insert 38, one cutter insert 42, and respective dowel pins 50 for securing the cutter inserts 38 and 42 within the cutter mounting holes 40 and 44, respectively.
  • the cutter insert 38 and the cutter insert 42 can be seen with associated projection lines extending along cutter axes 62 and into respective mounting holes 40 and 44.
  • the cutter insert 38 will insert into the open end of the mounting hole 40, and then two of the dowel pins 50 will be installed into the dowel pin holes 68.
  • the cutter insert 42 will insert into the open end of the mounting hole 44, and then two of the dowel pins 50 will be installed into the dowel pin holes 70.
  • the dowel pin holes 68 and 70 are of the same construction as dowel pin holes 48 show in FIGS. 1 and 4, but labeled with different reference numerals in FIG. 5 to correlate the particular holes 66 and 70 to respective cutter inserts 38 and 42.
  • the dowel pins 66 and 70 are installed, they are preferably spot welded into place to permanently retain the cutter inserts 38 and 42 in the cutting head 18 of the bit body 14. As noted below, the cutter inserts 38 and 42 will be free to rotate about the cutter axes 62.
  • FIG. 6 is an exploded, perspective view of one of the cutter inserts 38 and two dowel pins 50.
  • the cutter inserts 38 and 42 are preferably of the same construction.
  • the cutter insert 38 has a longitudinal cutter axis 62 and an insert body 52.
  • the insert body 52 is preferably a solid body and coaxial with the cutter axis 62.
  • the insert body 52 includes a carbide cutting tip 54, a barrel 56, and dowel recess 58.
  • the dowel recess 58 is preferably annular- shaped and extend around an exterior periphery of the insert body 53 and defines a groove for receiving the dowel pins 50.
  • a lower end defines an annular- shaped flange 60 which retains the shanks 72 of the dowel pins 50 within the recess 58.
  • a seal gland groove 66 is provided for receiving a seal element, such as an O-ring, which seals between the seal gland groove 66 and the mounting hole 40.
  • the dowel pins 50 have shanks 72, or pin sections, and head 74.
  • dowel pins may be used which do not have head.
  • the dowel pins 50 have longitudinal lengths defining central axes 76 which extend perpendicular to the cutter axis 62, when the cutter inserts 38 and 42 are disposed in respective ones of the mounting holes 40 and 44, and the dowel pins are disposed in dowel pin holes 48, 68 and 70. This allows the cutter inserts 38 and 42 to rotate within the mounting holes 40 and 44 around the cutter axes, as the dowel annular shaped recess 58 of the cutter insert body moves along the shanks 72 of the dowel pins 50.
  • the present disclosure provides advantages of not requiring a hole or knockout hole at the end of a cutter mounting hole for assembly of a fixed cutter rock bit. Instead the present disclosure provides dowel pins having shank axes which extend transverse to the longitudinal axes of respective cutter inserts, preferably perpendicular. Without requiring a knockout hole, a greater cutter insert density may be accomplished than with the prior art.
  • the present disclosure also has an advantage of the cutter inserts being able to rotate about respective longitudinal axes, extending the wear life of the cutter inserts rather than one side taking the brunt of wear as encountered with prior art non rotating inserts.

Abstract

A fixed cutter rock bit includes a cutting head having a plurality of spiral blades and bosses into which extend cutter insert mounting holes. Cutter inserts with cutting tips and barrels protrude outward from the mounting holes at an angle to the general direction of rotation of the cutting head. Each cutter insert has a cutting tip, a barrel, a dowel recess, an end flange, and a cutter axis extending from the cutting tip through an end flange. Dowel pin holes extend into the blades transverse to the cutter mounting holes, the dowel pin holes adapted to receive and position dowel pins transverse to the cutter inserts such that the cutter inserts are free to rotate about their respective cutter insert axes.

Description

FIXED CUTTER ROCK BIT WITH ROTATING CUTTER INSERTS
INVENTOR(S)
[0001] Nam Duy Nguyen, a resident of the City of Lewisville, in Denton County, Texas, United States of America, and a citizen of the United States of America.
TECHNICAL FIELD OF THE INVENTION
[0002] The present invention relates in general to rock bits for rotary drilling, and in particular to fixed cutter rock bits having cutter inserts. BACKGROUND OF THE INVENTION
[0003] Rock bits have been used for drilling into earth formations. One type of rock bits are Klaw type drill bits which are fixed cutter rock bits having cutter inserts which extend from a cutting head and are fixed in position so they do not move. These type rock bits typically have a number of carbide cutter inserts, each with a cutter tip which extends outward from the bit body in a direction of travel. The cutter inserts are mounted in holes and held in the mounting holes by welding the rearward end of the cutter inserts through knock-out holes located in an inward end of the mounting holes, such that the cutter inserts do not rotate within the mounting holes. Due to the geometry of the rock bits, the cutter inserts which are fixed in position will wear on one side during normal use.
SUMMARY OF THE INVENTION
[0004] A novel cutter rock bit is disclosed which provides a Klaw bit having cutter inserts with cutting tips and intermediate portions which protrude outward from a bit body. The bit body has a pin end, a cutting head, an intermediate portion extending between the cutting head and the pin end, and a central bore extending through the pin end, the intermediate portion and into the cutting head. The cutting head has a plurality of blades with cutting and debris channels extending between the blades. Flow ports extend from the central bore to the cutting and debris channels. The blades define end faces and shoulders, and provide bosses into which extend cutter mounting holes and dowel pin holes. The blades extend from a central portion of the cutting head, outward toward the shoulders in a spiral pattern. The cutter mounting holes extend in directions along general lines of travel of the cutter head. The dowel pin holes extend transverse to corresponding ones of the cutter mounting holes. The cutter inserts each have a cutting tip formed of carbide, a barrel, a dowel recess, an end flange, and a cutter axis which extends from the cutting tip through the end flange. The cutter inserts and the cutter mounting holes are adapted for aligning the cutter axes in the general direction of travel of the cutting head. The dowel pins have a shank which defines a central axis disposed in coaxial relation therewith. The dowel pins and the dowel pin holes are adapted for aligning the dowel pins in transverse relation to the cutter inserts such that the central axes of the dowel pins are disposed transverse to the cutter axes and the dowel pins extend within the dowel recesses of the cutter inserts and retain the cutter inserts within the cutter mounting holes, with the cutter inserts being rotatable about respective ones of the cutter axes. The dowel pins are welded within respective ones of the dowel pin holes.
DESCRIPTION OF THE DRAWINGS
[0005] For a more complete understanding of the present invention and the advantages thereof, reference is now made to the following description taken in conjunction with the accompanying Drawings in which FIGS. 1 through 6 show various aspects for a fixed cutter rock bit made according to the present disclosure, as set forth below:
FIG. 1 is a perspective view of a fixed cutter rock bit having rotating cutter inserts;
FIG. 2 is a bottom view of the fixed cutter rock bit;
FIG. 3 is a section view of the fixed cutter rock bit, taken along Section Line 3-3 of FIG. 2; FIG. 4 is an exploded, perspective view of the fixed cutter rock bit showing the bit body and flow nozzles;
FIG. 5 is an exploded, perspective view of the fixed cutter rock bit showing the bit body and cutter inserts; and
FIG. 6 is an exploded, perspective view of one of the cutter inserts and two dowel pins.
DETAILED DESCRIPTION OF THE INVENTION
[0006] FIG. 1 is a perspective view of a fixed cutter rock bit 12 having a bit body 14, which includes a pin end 16, a cutting head 18, and an intermediate portion 20 connecting between the pin end 16 and the cutting head 18. A central bore 22 (shown in FIG. 3) extends longitudinally through the pin end 16, the intermediate portion 20, and into the cutting head 18 providing a flow passage. The cutting head 18 has end faces 24 and shoulders 26 which are milled to define blades 28, 30, and cuttings and debris channels 32. The blades 28 and 30 are rib-like protrusions with the end faces 24 which radially extend in substantially transverse relation to a longitudinal axis 46 of the bit body 14. The shoulders 26 are the outwardly lateral facing sides of the blades 28 and 30 which preferably extend substantially parallel to the longitudinal axis 46. Flow ports 34 extend between the central bore 22 and the channels 32 for passing drilling fluid through the bit body and into the channels 32. Nozzles 36 are mounted in the flow ports 34 and have orifices for metering drilling fluid flow from the central bore 22. The drilling fluid may be provided as a liquid, as a gas, such as air, or a mixture thereof. The blades 28 are preferably of a larger size than the blades 30. Cutter inserts 38 are mounted in cutter mounting holes 40 which are preferably formed into the respective ones of the end faces 24. Cutter inserts 42 are mounted in cutter mounting holes 44 which are preferably formed into the shoulders 26 along the sides of the blades 28 and 30. The cutter mounting holes 40 and 44 are preferably blind holes, having only outward open ends into which the cutter inserts 38 and 42 are mounted and two intersecting dowel pin holes 48. In some embodiments a single dowel pin hole 48 may be utilized with either a single rigid dowel pin or a dowel pin which will flex around a curve. In the present embodiment two rigid dowel pins 50 are used.
[0007] FIG. 2 is a bottom view and FIG. 3 is a section view, taken along Section Line 3-3 of FIG.
2, of the fixed cutter rock bit 12. The blades 28 and 30 provide bosses in which extend the cutter mounting holes 40 and 44, and the dowel pin holes 48. The blades 28 and 30 extend from a central portion of the cutting head 18, outward towards the shoulders 26 in a spiral pattern. The central bore 22 is shown extending through the pin end 16, the intermediate portion 20, and into the cutting head 18. Flow ports 34 are shown extending from the central bore 22, through the cutting head 18, and into the cutting and debris channels 32. The nozzles 36 are disposed in the flow ports and have orifices to control the flow such that it will pass evenly through each of the nozzles 36. One of cutter inserts 38 is shown with a cutter axis 62 which is at an angle 64 to the longitudinal axis 46 of the bit body 14. The angle 64 will preferably range from thirty to sixty degrees. The cutter inserts 42 located in shoulders 26 of the blades 28 and 30 are also preferably aligned at the same angle 64 as the cutter inserts 38.
[0008] FIG. 4 is an exploded, perspective view of the fixed cutter rock bit 12 showing the bit body 14 and flow nozzles 36. The flow nozzles 36 are shown displaced equal distances from the position in which they are located when installed in the flow ports 34. The flow ports 34 are preferably drilled and tapped and the lower ends of the flow nozzles are threaded for threadingly securing the flow nozzles 36 within the flow ports 34. In the embodiment shown, there are seven flow nozzles 36 which fit into the seven flow ports 34 shown in FIG. 2. Longitudinal section views of four of the flow nozzles 36 are shown in FIG. 3, and flow paths through the nozzles 36 can be seen tapering to smaller internal diameters in conventional fashion.
[0009] FIG. 5 is an exploded, perspective view of the fixed cutter rock bit 12 showing the bit body 14, one cutter insert 38, one cutter insert 42, and respective dowel pins 50 for securing the cutter inserts 38 and 42 within the cutter mounting holes 40 and 44, respectively. The cutter insert 38 and the cutter insert 42 can be seen with associated projection lines extending along cutter axes 62 and into respective mounting holes 40 and 44. The cutter insert 38 will insert into the open end of the mounting hole 40, and then two of the dowel pins 50 will be installed into the dowel pin holes 68. The cutter insert 42 will insert into the open end of the mounting hole 44, and then two of the dowel pins 50 will be installed into the dowel pin holes 70. The dowel pin holes 68 and 70 are of the same construction as dowel pin holes 48 show in FIGS. 1 and 4, but labeled with different reference numerals in FIG. 5 to correlate the particular holes 66 and 70 to respective cutter inserts 38 and 42. Once the dowel pins 66 and 70 are installed, they are preferably spot welded into place to permanently retain the cutter inserts 38 and 42 in the cutting head 18 of the bit body 14. As noted below, the cutter inserts 38 and 42 will be free to rotate about the cutter axes 62. [0010] FIG. 6 is an exploded, perspective view of one of the cutter inserts 38 and two dowel pins 50. The cutter inserts 38 and 42 are preferably of the same construction. The cutter insert 38 has a longitudinal cutter axis 62 and an insert body 52. The insert body 52 is preferably a solid body and coaxial with the cutter axis 62. The insert body 52 includes a carbide cutting tip 54, a barrel 56, and dowel recess 58. The dowel recess 58 is preferably annular- shaped and extend around an exterior periphery of the insert body 53 and defines a groove for receiving the dowel pins 50. A lower end defines an annular- shaped flange 60 which retains the shanks 72 of the dowel pins 50 within the recess 58. A seal gland groove 66 is provided for receiving a seal element, such as an O-ring, which seals between the seal gland groove 66 and the mounting hole 40. The dowel pins 50 have shanks 72, or pin sections, and head 74. In other embodiments dowel pins may be used which do not have head. The dowel pins 50 have longitudinal lengths defining central axes 76 which extend perpendicular to the cutter axis 62, when the cutter inserts 38 and 42 are disposed in respective ones of the mounting holes 40 and 44, and the dowel pins are disposed in dowel pin holes 48, 68 and 70. This allows the cutter inserts 38 and 42 to rotate within the mounting holes 40 and 44 around the cutter axes, as the dowel annular shaped recess 58 of the cutter insert body moves along the shanks 72 of the dowel pins 50.
[0011] The present disclosure provides advantages of not requiring a hole or knockout hole at the end of a cutter mounting hole for assembly of a fixed cutter rock bit. Instead the present disclosure provides dowel pins having shank axes which extend transverse to the longitudinal axes of respective cutter inserts, preferably perpendicular. Without requiring a knockout hole, a greater cutter insert density may be accomplished than with the prior art. The present disclosure also has an advantage of the cutter inserts being able to rotate about respective longitudinal axes, extending the wear life of the cutter inserts rather than one side taking the brunt of wear as encountered with prior art non rotating inserts.
[0012] Although the preferred embodiment has been described in detail, it should be understood that various changes, substitutions and alterations can be made therein without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

WHAT IS CLAIMED IS:
1. A fixed cutter rock bit having a bit body with a pin end, a cutting head, and an intermediate portion extending between the cutting head and the pin end, the fixed cutter rock bit comprising: the cutting head having a plurality of blades defining end faces and shoulders into which extend cutter mounting holes and dowel pin holes, wherein said cutter mounting holes extend in directions along general lines of travel of said cutter head and said dowel pin holes extend transverse to corresponding ones of said cutter mounting holes; cutter inserts each having a cutting tip, a barrel, a dowel recess, an end flange, and a cutter axis which extends from said cutting tip through said end flange, wherein said cutter inserts and said cutter mounting holes are adapted for aligning said cutter axes in the general direction of travel of the cutting head; and dowel pins having a shank which defines a central axis disposed in coaxial relation therewith, wherein said dowel pins and said dowel pin holes are adapted for aligning said dowel pins in transverse relation to corresponding ones of said cutter inserts such that said central axes of said dowel pins are disposed transverse to said cutter axes of said corresponding ones of said cutter inserts and said dowel pins extend within said dowel recesses of said corresponding ones of cutter inserts and retain said cutter inserts within said cutter mounting holes.
2. The fixed cutter rock bit according to Claim 1, wherein said cutter inserts are rotatable about respective ones of said cutter axes, such that said dowel recesses of said corresponding ones of said cutter inserts are moveable relative to said dowel pins.
3. The fixed cutter rock bit according to Claim 1, further comprising said dowel pins being welded within respective ones of said dowel pin holes.
4. The fixed cutter rock bit according to Claim 1, wherein said cutter inserts extend from said cutter mounting holes outward of said blades, with said cutting tips and at least part of said barrels being disposed outward of said cutter mounting holes and said blades.
5. The fixed cutter rock bit according to Claim 1, wherein said blades extend from a central portion of said cutting head, outward toward said shoulders in a spiral pattern.
6. The fixed cutter rock bit according to Claim 1, further comprising a central bore extending through said pin end, said intermediate portion and into said cutting head, and further including flow ports extending from said central bore to said cutting and debris channels, wherein nozzles are disposed in said flow ports for controlling flow from said central bore into said cutting and debris channels.
7. A fixed cutter rock bit having a bit body with a pin end, a cutting head, an intermediate portion extending between the cutting head and the pin end, and a central bore providing a flow passage through the pin end and the intermediate portion, the fixed cutter rock bit comprising: the cutting head having a plurality of blades with cutting and debris channels extending between said blades, and said blades defining end faces and shoulders into which extend cutter mounting holes and dowel pin holes, wherein said cutter mounting holes extend in directions along general lines of travel of said cutter head and said dowel pin holes extend transverse to corresponding ones of said cutter mounting holes; cutter inserts each having a cutting tip, a barrel, a dowel recess, an end flange, and a cutter axis which extends from said cutting tip through said end flange, wherein said cutter inserts and said cutter mounting holes are adapted for aligning said cutter axes in the general direction of travel of the cutting head; dowel pins having a shank which defines a central axis disposed in coaxial relation therewith, wherein said dowel pins and said dowel pin holes are adapted for aligning said dowel pins in transverse relation to corresponding ones of said cutter inserts such that said central axes of said dowel pins are disposed transverse to said cutter axes of said corresponding ones of said cutter inserts and said dowel pins extend within said dowel recesses of said corresponding ones of cutter inserts and retain said cutter inserts within said cutter mounting holes; and wherein said cutter inserts are rotatable about respective ones of said cutter axes, such that said dowel recesses of said corresponding ones of said cutter inserts move relative to said dowel pins.
8. The fixed cutter rock bit according to Claim 7, further comprising said dowel pins being welded within respective ones of said dowel pin holes.
9. The fixed cutter rock bit according to Claim 7, wherein said cutter inserts extend from said cutter mounting holes outward of said blades, with said cutting tips and at least part of said barrels being disposed outward of said cutter mounting holes and said blades.
10. The fixed cutter rock bit according to Claim 7, wherein said blades extend from a central portion of said cutting head, outward toward said shoulders in a spiral pattern.
11. The fixed cutter rock bit according to Claim 7, further comprising flow ports extending from said central bore to said cutting and debris channels, wherein nozzles are disposed in said flow ports for controlling flow from said central bore into said cutting and debris channels.
12. A fixed cutter rock bit having a bit body with a pin end, a cutting head, an intermediate portion extending between the cutting head and the pin end, the fixed cutter rock bit comprising: the cutting head having a plurality of blades with cutting and debris channels extending between said blades, and said blades defining end faces and shoulders into which extend cutter mounting holes and dowel pin holes, wherein said cutter mounting holes extend in directions along general lines of travel of said cutter head and said dowel pin holes extend transverse to corresponding ones of said cutter mounting holes; cutter inserts each having a cutting tip formed of carbide, a barrel, a dowel recess, an end flange, and a cutter axis which extends from said cutting tip through said end flange, wherein said cutter inserts and said cutter mounting holes are adapted for aligning said cutter axes in the general direction of travel of the cutting head; dowel pins having a shank which defines a central axis disposed in coaxial relation therewith, wherein said dowel pins and said dowel pin holes are adapted for aligning said dowel pins in transverse relation to corresponding ones of said cutter inserts such that said central axes of said dowel pins are disposed transverse to said cutter axes of said corresponding ones of said cutter inserts and said dowel pins extend within said dowel recesses of said corresponding ones of cutter inserts and retain said cutter inserts within said cutter mounting holes; wherein said cutter inserts extend from said cutter mounting holes outward of said blades, with said cutting tips and at least part of said barrels being disposed outward of said cutter mounting holes and said blades; and said cutter inserts are rotatable about respective ones of said cutter axes, such that said dowel recesses of said corresponding ones of said cutter inserts are move relative to said dowel pins.
13. The fixed cutter rock bit according to Claim 12, further comprising said dowel pins being welded within respective ones of said dowel pin holes.
14. The fixed cutter rock bit according to Claim 12, wherein said blades extend from a central portion of said cutting head, outward toward said shoulders in a spiral pattern.
15. The fixed cutter rock bit according to Claim 12, further comprising flow ports extending from said central bore to said cutting and debris channels, wherein nozzles are disposed in said flow ports for controlling flow from said central bore into said cutting and debris channels.
PCT/US2021/062981 2021-03-12 2021-12-11 Fixed cutter rock bit with rotating cutter inserts WO2022191888A1 (en)

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US202117200759A 2021-03-12 2021-03-12
US17/200,759 2021-03-12

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US20170030145A1 (en) * 2014-05-07 2017-02-02 Baker Hughes Incorporated Formation-engaging assemblies, earth-boring tools including such assemblies, and associated methods
US20170130534A1 (en) * 2014-05-07 2017-05-11 Baker Hughes Incorporated Earth-boring tools carrying formation-engaging structures
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US20170030145A1 (en) * 2014-05-07 2017-02-02 Baker Hughes Incorporated Formation-engaging assemblies, earth-boring tools including such assemblies, and associated methods
US20170130534A1 (en) * 2014-05-07 2017-05-11 Baker Hughes Incorporated Earth-boring tools carrying formation-engaging structures
US10458188B2 (en) * 2017-10-26 2019-10-29 Baker Hughes, A Ge Company, Llc Cutting element assemblies comprising rotatable cutting elements, earth-boring tools including such cutting element assemblies, and related methods

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