US3301339A - Drill bit with wear resistant material on blade - Google Patents

Drill bit with wear resistant material on blade Download PDF

Info

Publication number
US3301339A
US3301339A US376439A US37643964A US3301339A US 3301339 A US3301339 A US 3301339A US 376439 A US376439 A US 376439A US 37643964 A US37643964 A US 37643964A US 3301339 A US3301339 A US 3301339A
Authority
US
United States
Prior art keywords
blades
body member
blade
bit
center
Prior art date
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
Application number
US376439A
Inventor
Jr Eugene S Pennebaker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ExxonMobil Upstream Research Co
Original Assignee
Exxon Production Research Co
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 Exxon Production Research Co filed Critical Exxon Production Research Co
Priority to US376439A priority Critical patent/US3301339A/en
Application granted granted Critical
Publication of US3301339A publication Critical patent/US3301339A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

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
    • E21B10/02—Core bits
    • E21B10/04—Core bits with core destroying means
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/48—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of core type
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • 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
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/56—Button-type inserts

Definitions

  • the present invention is directed to a drill bit which has improved stability performance in drilling vertical wells. More particularly, the invention is concerned with an improved drill bit of the drag type. In its more specific aspects, the invention is concerned with a drag type bit that drills a straight, fast hole and has improved penetration performance.
  • the present invention may be briefly described as a drill bit adapted to be attached to a hollow drill string.
  • the drill bit comprises a body member having -a plurality of spaced-apart blades attached thereto.
  • Each of the blades has a length no greater than the distance from the center of the body member to the outer edge of the blades and the blades have a ratio of length to thickness within the range from about 3:1 to about 4:1.
  • Theblades extend inwardly toward, but terminate short of the center of the body member to provide a space at the center of the body member.
  • the leading face of each of the blades is covered with abrasive material which extends over the leading face or substantially covers the leading face.
  • the abrasive material is of progressively increasing hardness orprogressively increasing thickness such that it provides progressively increasing wear resistance to each of thebladesfrom the inner to the outer edge of the blades.
  • a core breaker extends from the body member into the space at the center of the body member, the core breaker having a surface on its free end defining means for deflecting a core broken by the core breaker.
  • Fluid passageways are defined by the body member and terminate in nozzles adapted to direct fluid to a point ahead of the blades.
  • the blades have a length in the range from about 2 to about 3 inches measured from the end of the bit body for a 6 A-inch gauge bit and proportionately the same length for other size bits.
  • the blade length for an 8%-inch gauge bit may be within the range from I about 2% inches to about 4 inches.
  • the bits of the present invention may be used to drill boreholes from about 4 inches to about 9 inches in diameter, but larger holes may also be drilled with the improved bit.
  • the core formed at the center of the bit is determined by the size of the space at the center of the bit and the core may be from about inch to about 1 inch in diameter. Hence, the distance from the inner edge of each blade to the center of the bit is suitably within the range from about 1 inch to about inch.
  • the core breaker should be as short as possible to cut a core even when the blades may become worn.
  • a suitable length measured from the bit body for the core breaker is from about /2 inch to about inch with the angle of the deflecting means being within the range from about 20 to about 45 with respect to the plane atthe identical.
  • FIG. 5 is an isometric view of a preferred embodiment of the present invention.
  • bit weight must be increased to maintain the same unit loading.
  • available drill collar weight thus becomes inadequate to maintain the same unit loading, and penetration rate slows.
  • drill collar weight is added to increase bit weight, the lower part of the drill collar string begins to bow. The bit is thus deflected at a slight angle to the borehole by an amount proportional to the severity of the bow.
  • the ability of the bit to cut sideways therefore depends on the sharpness of the reaming edge and/or the length of the reaming blade. Thus, if for any reason the bit deviates from the vertical, the bit must drill sideways to return the hole to the vertical. Considering the bending action of the drill string as discussed before, it is readily seen that the bit must be capable of cutting laterally or it would not be possible to drill a vertical hole using the relatively limber or flexible drill collar system for weight as is currently done.
  • numeral 13 designates a body member which is adapted to be attached to a drill string, such as 12 of FIG. 1, in drilling a borehole I l.
  • the body member has attached to it a plurality of blades, such as at least three blades designated by the numerals 14, 17 and 19.
  • the blades 14, 17 and 19 are different but ordinarily in a drill bit these three blades are substantially
  • the bit blade 14 tapers outwardly from a point short of the center of the body member 13 and is FIG. 4 is an edge view 'of one of the blades of FIG. 2; I
  • plates 15 of abrasive material such as tungsten carbide which substantially cover the leading face of the blade 14.
  • the outer plate 15 covering the blade 14 may suitably be impregnated with diamonds 16 It will be noted that the outer plate 15 is impregnated with diamonds; whereas, the next plate 15 is not impregnated with diamonds and the two inner plates '15 are of decreasing thickness.
  • the plates 15 provide progressively increasing wear resistance to the blade 14 extending outwardly from the inner to the outer edge of the blade 14.
  • blade 17 which is provided with plates 18 of tungsten carbide of progressively increasing thickness extending from the inner edge to the outer edge.
  • Blade 18 is provided with plates 20 of tungsten carbide of progressively increasing hardness extending from the inner edge of the outer edge. Also, the blade 19 is provided with formed inserters 21 of tungsten carbide or other abrasive material of progressively increasing size or hardness from the inner to the outer edge. These inserts may be cylindrical or other shapes, such as the oblong shape 22.
  • blade '14 has a taper and differs in shape from blades 17 and 19.
  • the body member 16 is provided with water courses terminating in nozzles 23 which are adapted to discharge drilling fluid from the hollow drill string ahead of each of the blades 14, 17 and 19.
  • Each of the blades 14, 17 and 19 (only one of which is illustrated in FIG. 3) is provided with a pilot blade.
  • this blade is provided on its free end with a pilot blade 24 which projects ahead of the blade 14.
  • the pilot blade 24 is also provided with a plate 25 of abrasive material, such as tungsten carbide.
  • the three blades 14, -17 and 19 provide a space at the center of the body member 13 in which is arranged a core breaker 26 defining a surface 27 which serves as a coredeflecting means.
  • the several blades described with respect to FIGS. 2 to 4 are made of tough, high alloy steel, preferably forged steel, and are attached to the body member by welding after machining and attachment of the tungsten carbide plates.
  • the blades are relatively thin and have a ratio of blade length to thickness preferably in the range of about 3:1 to about 4:1 and taper toward the cutting edge, as shown more clearly in FIG. 4.
  • FIG. 4 shows another arrangement of a blade designated as blade 28 provided with a taper 29.
  • the blade 28 is provided with plates 30 of abrasive material, such as tungsten carbide, and the edge 29 may suitably be provided with diamond-impregnated tungsten carbide inserts 31 to provent excessive gauge wear.
  • the exposed diamonds also provide lateral cutting action for the maintenance of a vertical hole.
  • a drill bit such as 40 is provided with a threaded pin 41 for attachment to a drill string such as .12.
  • a body member 42 has attached thereto by welds 43 three spaced-apart blades 44.
  • the blades 44 each is provided with a pilot blade 45 and the leading face of each blade, including the pilot blade, is substantially covered with plates 46 of abrasive material, such as tungsten carbide, which provides progressively increasing wear resistance from the inner edge 47 to the outer edge 48 of the blades '44.
  • the body member 42 is provided with a plurality of nozzles 23 which communicate with the interior of the body member 42 and with the hollow drill string for circulation of drilling fluid down the drill string and up the annulus between the drill string and the wall of the well.
  • the nozzles 23 are arranged to direct fluid ahead of the leading faces of the blades 44.
  • the space 49 at the center of the drill bit '40 is provided with a core breaker 50 defining a deflecting surface 51 for deflecting the core broken by the core breaker 50.
  • the drill bit In drilling with the drill bit of the present invention, the drill bit is attached to a hollow drill string and is rotated by the usual rotating means at the wellhead. As the bit penetrates by scraping action, cuttings generated by this scraping action are broken up and flushed to the surface by drilling fluid pumped through jet nozzles aimed at and slightly adhead of each blade. Since the scraping action is small at the center of the hole where the blades approach each other, it is desirable that the material in the center of the hole he removed and this is done by the core breaker, such as 50, and the core-deflecting means 51.
  • the bit in accordance with the present invention allows rapid penetration of formations and drills a substantially vertical hole which heretofore was difficult to achieve, particularly with drag type rbits.
  • the bit blades are of a proper length such that they remain sharp but do not break off due to lack of strength.
  • a plurality of blades such as at least three, smooth drilling action is achieved.
  • the present invention by virtue of the particular elements and arrangernent thereof, drills rapidly and straight.
  • abrasive material has been illustrated by sintered tungsten carbide and diamonds, other abrasive mate-rial such as, but not limited to various other carbides and special Wear-resistance alloys may be employed. Sintered tungsten carbide is preferred.
  • the present invention has been used successfully in drilling substantial footage of vertical holes at drilling rates greater than that achieved with comparable commercial bits.
  • the present invention is therefore quite important and useful.
  • a drill bit adapted to be attached to a hollow drill string which comprises a body member, a plurality of spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
  • a drill bit adapted to be attached to a hollow drill string which comprises a body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
  • a drill bit adapted to be attached to a hollow drill string which comprises a body member, at least three paced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space .at the center of said body member, a pilot blade projecting from the free end of each of said blades, abrasive material of progressively increasing hardness on the leading face of each of said blades including said pilot blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating
  • a drill bit adapted tobe attached to a hollow drill string which comprises a body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, said blades extending inwardly toward but terminating short of the center of said body member to provide .
  • a space at the center of said body member abrasive material of progressively increasing hardness on the leading fiace of each of said blades, the free end and edge of each of said :blades also being provided with formed inserts of abrasive material of progressively increasing hardness, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid
  • a drill bit adapted to be attached, to :a hollow drill string which comprises a :body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, a pilot blade projecting from the free end of each of said blades, sintered tungsten carbide substantially covering the leading face of each of said blades including said pilot blades, said tungsten carbide providing progressively increasing wear resistance to each of said blades including said pilot blades from the inner to the outer edge of each of said blades, the free end of each of said blades including said pilot blades also being provided with formed tungsten carbide inserts, a core breaker extending from said body member into said space and having a surface on its free
  • a drill bit adapted to be attached to a hollow drill string which comprises a :body member, -a plurality of spaced apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
  • a drill bit in accordance with claim 7 in which the blades extend inwardly to ward but terminate short of the center of the body member to provide :a space at the center of the body member and in which core breaking means are provided in said space.
  • a drill bit in accordance with claim 7 in which a pilot blade projects from the free end of each of said blades having abrasive material of progressively increasing hardness on the leading face of said pilot blade, said abrasive material on said pilot blade providing progressively increasing wear resistance from the inner to the outer edge of said pilot blade.

Description

Jan. 3 1, 1967 E. s. PENNEBAKER, JR 3,301,339
DRILL BIT WITH WEAR RESISTANT MATERIAL ON BLADE Filed June 19, 1964 5 Sheets-Sheet l BORE-HOLE II I FIG. I.
CONTACT POINT.
DRILL COLLARS |2 REAMING' EDGE OF a INVENTOR.
EUGENE s. PENNEBAKER JR.,
I ATTORN Jan. 31,1967 E. s. PENNEBAKER, JR 3,301,339
DRILL BIT WITH- WEAR RESISTANT MATERIAL ON BLADE Filed June 19, 1964 5 Sheets-Sheet 2 FIG. 4.
INVENTOR.
BY azwa ATTOR v.
EUGENE S. PENNEB AKER,JR.,
1967 E. s. PENNEBAKER, JR v 3,301,339
DRILL BIT WITH WEAR RESISTANT MATERIAL ON BLADE .Filed June.l9. 1964' I 5 heets-Sheet s INCREASED HARDNESS FROM CENTER INVENTOR. EUGENE S. PENNEBAKER, JR,,
United States Patent 3,301,339 DRILL BIT WITH WEAR RESISTANT MATERIAL 0N BLADE Eugene S. Pennebaker, Jr., Corpus Christi, Tex., assignor, by mesne assignments, to Esso Production Research Company, Houston, Tex., a corporation of Delaware Filed June 19, 1964, Ser. No. 376,439 9 Claims. (Cl. 175387) The present invention is directed to a drill bit which has improved stability performance in drilling vertical wells. More particularly, the invention is concerned with an improved drill bit of the drag type. In its more specific aspects, the invention is concerned with a drag type bit that drills a straight, fast hole and has improved penetration performance.
The present invention may be briefly described as a drill bit adapted to be attached to a hollow drill string. The drill bit comprises a body member having -a plurality of spaced-apart blades attached thereto. Each of the blades has a length no greater than the distance from the center of the body member to the outer edge of the blades and the blades have a ratio of length to thickness within the range from about 3:1 to about 4:1. Theblades extend inwardly toward, but terminate short of the center of the body member to provide a space at the center of the body member. The leading face of each of the blades is covered with abrasive material which extends over the leading face or substantially covers the leading face. The abrasive material is of progressively increasing hardness orprogressively increasing thickness such that it provides progressively increasing wear resistance to each of thebladesfrom the inner to the outer edge of the blades. A core breaker extends from the body member into the space at the center of the body member, the core breaker having a surface on its free end defining means for deflecting a core broken by the core breaker.
Fluid passageways are defined by the body member and terminate in nozzles adapted to direct fluid to a point ahead of the blades.
The blades have a length in the range from about 2 to about 3 inches measured from the end of the bit body for a 6 A-inch gauge bit and proportionately the same length for other size bits. For example, the blade length for an 8%-inch gauge bit may be within the range from I about 2% inches to about 4 inches.
The bits of the present invention may be used to drill boreholes from about 4 inches to about 9 inches in diameter, but larger holes may also be drilled with the improved bit. The core formed at the center of the bit is determined by the size of the space at the center of the bit and the core may be from about inch to about 1 inch in diameter. Hence, the distance from the inner edge of each blade to the center of the bit is suitably within the range from about 1 inch to about inch.
The core breaker should be as short as possible to cut a core even when the blades may become worn. A suitable length measured from the bit body for the core breaker is from about /2 inch to about inch with the angle of the deflecting means being within the range from about 20 to about 45 with respect to the plane atthe identical.
FIG. 5 is an isometric view of a preferred embodiment of the present invention.
It is desirable to make a bit drill fast and straight. In drilling with a bit, the penetration rate is proportional to the unit loading on bottom with other factors being equal. Thus for a given bit weight, the sharper the bit the faster the bit drills. As the bit becomes dull and begins to present an increasingly greater bearing area on bottom, bit weight must be increased to maintain the same unit loading. Thus, if the bit blade thickness is large, the bearing area on well bottom increases rapidly as the blade wears. Available drill collar weight thus becomes inadequate to maintain the same unit loading, and penetration rate slows. As drill collar weight is added to increase bit weight, the lower part of the drill collar string begins to bow. The bit is thus deflected at a slight angle to the borehole by an amount proportional to the severity of the bow. As an example: in a 7% -inch hole drilling with 6%- inch drill collars, if suflicient weight is applied to cause the drill collars to touch the side of the hole 30 feet above the bit, the axis of the bit will be aimed at such an angle to the hole that it will deflect the hole about one inch in 30 feet assuming no sidewise cutting action of the bit. Thus, deflecting action becomes cumulative, that is, the angle would not remain constant but would gradually increase. It is therefore important to consider the factors that keep a hole vertical at the same time penetration rate is considered.
In drilling a straight hole, the only force available to make a bit on the end of a flexible drill string drill a truly vertical hole is gravity, as shown in FIG. 1. Thus, in FIG. 1, in a borehole 11 drilled from the earths surface with a drill string 12 extending thereto, the weight of the drill collar W between the point of contact P and the bottom of the bit creates a force F acting downwardly by gravity. A horizontal force F results. The ability of the reaming edge of the bit to cut in the direction of the resultant horizontal force will then determine whether the direction of the borehole gradually returns to the vertical along directionD and continues along the same angle of deviation from the vertical along direction B or gradually builds up more along direction A. The ability of the bit to cut sideways therefore depends on the sharpness of the reaming edge and/or the length of the reaming blade. Thus, if for any reason the bit deviates from the vertical, the bit must drill sideways to return the hole to the vertical. Considering the bending action of the drill string as discussed before, it is readily seen that the bit must be capable of cutting laterally or it would not be possible to drill a vertical hole using the relatively limber or flexible drill collar system for weight as is currently done.
The problems of drilling a vertical hole are solved in accordance with the present invention by providing the apparatus which will be described relative to FIGS. 2 to 5.
Referring now to FIGS.v 2 to .4 in which identical numerals will designate identical parts, numeral 13 designates a body member which is adapted to be attached to a drill string, such as 12 of FIG. 1, in drilling a borehole I l. The body member has attached to it a plurality of blades, such as at least three blades designated by the numerals 14, 17 and 19. In the embodiment of FIG. 2, the blades 14, 17 and 19 are different but ordinarily in a drill bit these three blades are substantially The bit blade 14 tapers outwardly from a point short of the center of the body member 13 and is FIG. 4 is an edge view 'of one of the blades of FIG. 2; I
and
to provide increasing ab-rasiveness to the blade 14.
provided 'with plates 15 of abrasive material such as tungsten carbide, which substantially cover the leading face of the blade 14. The outer plate 15 covering the blade 14 may suitably be impregnated with diamonds 16 It will be noted that the outer plate 15 is impregnated with diamonds; whereas, the next plate 15 is not impregnated with diamonds and the two inner plates '15 are of decreasing thickness. Thus, the plates 15 provide progressively increasing wear resistance to the blade 14 extending outwardly from the inner to the outer edge of the blade 14.
This is illustrated also by blade 17 which is provided with plates 18 of tungsten carbide of progressively increasing thickness extending from the inner edge to the outer edge.
Blade 18 is provided with plates 20 of tungsten carbide of progressively increasing hardness extending from the inner edge of the outer edge. Also, the blade 19 is provided with formed inserters 21 of tungsten carbide or other abrasive material of progressively increasing size or hardness from the inner to the outer edge. These inserts may be cylindrical or other shapes, such as the oblong shape 22.
It will be noted that the blade '14 has a taper and differs in shape from blades 17 and 19.
The body member 16 is provided with water courses terminating in nozzles 23 which are adapted to discharge drilling fluid from the hollow drill string ahead of each of the blades 14, 17 and 19.
Each of the blades 14, 17 and 19 (only one of which is illustrated in FIG. 3) is provided with a pilot blade. Taking blade 14, for example, this blade is provided on its free end with a pilot blade 24 which projects ahead of the blade 14. The pilot blade 24 is also provided with a plate 25 of abrasive material, such as tungsten carbide.
The three blades 14, -17 and 19 provide a space at the center of the body member 13 in which is arranged a core breaker 26 defining a surface 27 which serves as a coredeflecting means.
The several blades described with respect to FIGS. 2 to 4 are made of tough, high alloy steel, preferably forged steel, and are attached to the body member by welding after machining and attachment of the tungsten carbide plates. The blades are relatively thin and have a ratio of blade length to thickness preferably in the range of about 3:1 to about 4:1 and taper toward the cutting edge, as shown more clearly in FIG. 4.
FIG. 4 shows another arrangement of a blade designated as blade 28 provided with a taper 29. The blade 28 is provided with plates 30 of abrasive material, such as tungsten carbide, and the edge 29 may suitably be provided with diamond-impregnated tungsten carbide inserts 31 to provent excessive gauge wear. The exposed diamonds also provide lateral cutting action for the maintenance of a vertical hole.
Referring now to FIG. 5, a drill bit such as 40 is provided with a threaded pin 41 for attachment to a drill string such as .12. A body member 42 has attached thereto by welds 43 three spaced-apart blades 44. The blades 44 each is provided with a pilot blade 45 and the leading face of each blade, including the pilot blade, is substantially covered with plates 46 of abrasive material, such as tungsten carbide, which provides progressively increasing wear resistance from the inner edge 47 to the outer edge 48 of the blades '44. The body member 42 is provided with a plurality of nozzles 23 which communicate with the interior of the body member 42 and with the hollow drill string for circulation of drilling fluid down the drill string and up the annulus between the drill string and the wall of the well. The nozzles 23 are arranged to direct fluid ahead of the leading faces of the blades 44. The space 49 at the center of the drill bit '40 is provided with a core breaker 50 defining a deflecting surface 51 for deflecting the core broken by the core breaker 50.
In drilling with the drill bit of the present invention, the drill bit is attached to a hollow drill string and is rotated by the usual rotating means at the wellhead. As the bit penetrates by scraping action, cuttings generated by this scraping action are broken up and flushed to the surface by drilling fluid pumped through jet nozzles aimed at and slightly adhead of each blade. Since the scraping action is small at the center of the hole where the blades approach each other, it is desirable that the material in the center of the hole he removed and this is done by the core breaker, such as 50, and the core-deflecting means 51.
The bit in accordance with the present invention allows rapid penetration of formations and drills a substantially vertical hole which heretofore was difficult to achieve, particularly with drag type rbits. Thus, the bit blades are of a proper length such that they remain sharp but do not break off due to lack of strength. By employing a plurality of blades, such as at least three, smooth drilling action is achieved. While heretofore 3-way drag bits drilled slowly and deviated rapidly, the present invention, by virtue of the particular elements and arrangernent thereof, drills rapidly and straight.
While the abrasive material has been illustrated by sintered tungsten carbide and diamonds, other abrasive mate-rial such as, but not limited to various other carbides and special Wear-resistance alloys may be employed. Sintered tungsten carbide is preferred.
The present invention has been used successfully in drilling substantial footage of vertical holes at drilling rates greater than that achieved with comparable commercial bits. The present invention is therefore quite important and useful.
The nature and objects of the present invention having been completely described and illustrated and the best mode and embodiment thereof contemplated set forth, what I wish to claim as new and useful and secure by Letters Patent is:
1. A drill bit adapted to be attached to a hollow drill string which comprises a body member, a plurality of spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
2. A drill bit adapted to be attached to a hollow drill string which comprises a body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
3. A drill bit adapted to be attached to a hollow drill string which comprises a body member, at least three paced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space .at the center of said body member, a pilot blade projecting from the free end of each of said blades, abrasive material of progressively increasing hardness on the leading face of each of said blades including said pilot blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
4. A drill bit adapted tobe attached to a hollow drill string which comprises a body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, said blades extending inwardly toward but terminating short of the center of said body member to provide .a space at the center of said body member, abrasive material of progressively increasing hardness on the leading fiace of each of said blades, the free end and edge of each of said :blades also being provided with formed inserts of abrasive material of progressively increasing hardness, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
5. A drill bit adapted to be attached, to :a hollow drill string which comprises a :body member, at least three spaced-apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades and having a ratio of length to thickness within the range from about 3 to about 1 to about 4 to about 1, said blades extending inwardly toward but terminating short of the center of said body member to provide a space at the center of said body member, a pilot blade projecting from the free end of each of said blades, sintered tungsten carbide substantially covering the leading face of each of said blades including said pilot blades, said tungsten carbide providing progressively increasing wear resistance to each of said blades including said pilot blades from the inner to the outer edge of each of said blades, the free end of each of said blades including said pilot blades also being provided with formed tungsten carbide inserts, a core breaker extending from said body member into said space and having a surface on its free end defining means for deflecting a core broken by said core breaker, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
6. A drill bit in accordance with claim 5 in which said inserts also provide increasing Wear resistance from the inner to the outer edge of said pilot blades.
7. A drill bit adapted to be attached to a hollow drill string which comprises a :body member, -a plurality of spaced apart blades attached to said body member, each of said blades having a length no greater than the distance from the center of the body member to the outer edge of said blades, abrasive material of progressively increasing hardness on the leading face of each of said blades, said abrasive material providing progressively increasing wear resistance to each of said blades from the inner to the outer edge of each of said blades, and fluid passageways defined by said body member terminating in nozzles adapted to direct fluid to a point ahead of each of said blades.
8. A drill bit in accordance with claim 7 in which the blades extend inwardly to ward but terminate short of the center of the body member to provide :a space at the center of the body member and in which core breaking means are provided in said space.
9. A drill bit in accordance with claim 7 in which a pilot blade projects from the free end of each of said blades having abrasive material of progressively increasing hardness on the leading face of said pilot blade, said abrasive material on said pilot blade providing progressively increasing wear resistance from the inner to the outer edge of said pilot blade.
References Cited by the Examiner UNITED STATES PATENTS 2,740,612 4/1956 Phipps -404 3,106,973 10/1963 Christensen 175410 3,127,945 4/1964 Bridwell et al 175-410 3,140,748 7/1964 Engle et a1 175410 3,145,790 8/1964 Bridwell et al. 175-409 3,199,617 8/ 1965 White 175404 FOREIGN PATENTS 900,099 7/ 1962 England.
CHARLES E. OCONNELL, Primary Examiner.
JAM S LEPP NK, xaminer.

Claims (1)

  1. 7. A DRILL BIT ADAPTED TO BE ATTACHED TO A HOLLOW DRILL STRING WHICH COMPRISES A BODY MEMBER, A PLURALITY OF SPACED APART BLADES ATTACHED TO SAID BODY MEMBER, EACH OF SAID BLADES HAVING A LENGTH NO GREATER THAN THE DISTANCE FROM THE CENTER OF THE BODY MEMBER TO THE OUTER EDGE OF SAID BLADES, ABRASIVE MATERIAL OF PROGRESSIVELY INCREASING HARDNESS ON THE LEADING FACE OF EACH OF SAID BLADES, SAID ABRASIVE MATERIAL PROVIDING PROGRESSIVELY INCREASING WEAR RESISTANCE TO EACH OF SAID BLADES FROM THE INNER TO THE OUTER EDGE OF EACH OF SAID BLADES, AND FLUID PASSAGEWAYS DEFINED BY SAID BODY MEMBER TERMINATING IN NOZZLES ADAPTED TO DIRECT FLUID TO A POINT AHEAD OF EACH OF SAID BLADES.
US376439A 1964-06-19 1964-06-19 Drill bit with wear resistant material on blade Expired - Lifetime US3301339A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US376439A US3301339A (en) 1964-06-19 1964-06-19 Drill bit with wear resistant material on blade

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US376439A US3301339A (en) 1964-06-19 1964-06-19 Drill bit with wear resistant material on blade

Publications (1)

Publication Number Publication Date
US3301339A true US3301339A (en) 1967-01-31

Family

ID=23485038

Family Applications (1)

Application Number Title Priority Date Filing Date
US376439A Expired - Lifetime US3301339A (en) 1964-06-19 1964-06-19 Drill bit with wear resistant material on blade

Country Status (1)

Country Link
US (1) US3301339A (en)

Cited By (87)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0029535A1 (en) * 1979-11-19 1981-06-03 General Electric Company Compacts for diamond drill and saw applications
EP0030558A1 (en) * 1979-06-19 1981-06-24 Syndrill Carbide Diamond Company Deep hole rock drill bit
DE3147099A1 (en) * 1980-12-01 1982-07-01 Christensen, Inc., 84115 Salt Lake City, Utah "TURNING WORKING DRILL BIT"
FR2538442A1 (en) * 1982-12-23 1984-06-29 Charbonnages De France JET ASSISTED ROTATING FORTIFIER
DE3347696A1 (en) * 1983-12-31 1985-07-11 Bergwerksverband Gmbh, 4300 Essen Device for the rotary drilling of rock
US4928777A (en) * 1984-12-22 1990-05-29 Nl Petroleum Products Limited Cutting elements for rotary drill bits
EP0442675A2 (en) * 1990-02-10 1991-08-21 Tri-State Oil Tool (UK), a division of Baker Hughes Limited Milling tool for well side-tracking
US5289876A (en) * 1992-07-28 1994-03-01 Natural Reserves Group, Inc. Completing wells in incompetent formations
US6450271B1 (en) 2000-07-21 2002-09-17 Baker Hughes Incorporated Surface modifications for rotary drill bits
US20070114067A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly 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
US20070125580A1 (en) * 2005-11-21 2007-06-07 Hall David R Jet Arrangement for a Downhole 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
US20080011522A1 (en) * 2005-11-21 2008-01-17 Hall David R Retaining Element for a Jack Element
US20080035388A1 (en) * 2006-08-11 2008-02-14 Hall David R Drill Bit Nozzle
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
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
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
US7527110B2 (en) 2006-10-13 2009-05-05 Hall David R Percussive drill bit
US20090133938A1 (en) * 2006-08-11 2009-05-28 Hall David R Thermally Stable Pointed Diamond with Increased Impact Resistance
US20090133936A1 (en) * 2006-03-23 2009-05-28 Hall David R Lead the Bit Rotary Steerable Tool
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US20090183919A1 (en) * 2005-11-21 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7571780B2 (en) 2006-03-24 2009-08-11 Hall David R Jack element for a drill bit
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
US7661487B2 (en) 2006-03-23 2010-02-16 Hall David R Downhole percussive tool with alternating pressure differentials
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
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
US20100326740A1 (en) * 2009-06-26 2010-12-30 Hall David R Bonded Assembly Having Low Residual Stress
US7866416B2 (en) 2007-06-04 2011-01-11 Schlumberger Technology Corporation Clutch for a jack element
US20110042150A1 (en) * 2006-08-11 2011-02-24 Hall David R Roof Mining Drill Bit
US7900720B2 (en) 2006-01-18 2011-03-08 Schlumberger Technology Corporation Downhole drive shaft connection
US20110080036A1 (en) * 2007-05-15 2011-04-07 Schlumberger Technology Corporation Spring Loaded Pick
US7967083B2 (en) 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US8011457B2 (en) 2006-03-23 2011-09-06 Schlumberger Technology Corporation Downhole hammer assembly
US8020471B2 (en) 2005-11-21 2011-09-20 Schlumberger Technology Corporation Method for manufacturing a drill 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
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
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
US20150368976A1 (en) * 2014-06-19 2015-12-24 Tercel Ip Ltd Fixed-cutter drill bits generating cores
RU2581059C1 (en) * 2015-03-26 2016-04-10 ООО "Камышинский завод бурового инструмента" (ООО "КЗБИ") Percussion-rotary drilling bit
US9316061B2 (en) 2006-08-11 2016-04-19 David R. Hall High impact resistant degradation element
US20160123086A1 (en) * 2014-11-05 2016-05-05 Yan Yan Rao Anti-balling Drill 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
US9915102B2 (en) 2006-08-11 2018-03-13 Schlumberger Technology Corporation Pointed working ends on a bit
US10029391B2 (en) 2006-10-26 2018-07-24 Schlumberger Technology Corporation High impact resistant tool with an apex width between a first and second transitions
US20220136329A1 (en) * 2019-03-01 2022-05-05 Bly Ip Inc. High speed drilling system and methods of using same

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740612A (en) * 1954-02-23 1956-04-03 Phipps Orville Two-arm rotary drill bit
GB900099A (en) * 1958-08-22 1962-07-04 Salzgitter Maschinen Ag Improvements in or relating to boring crowns
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
US3127945A (en) * 1960-03-02 1964-04-07 Jersey Prod Res Co Drag bit
US3140748A (en) * 1963-05-16 1964-07-14 Kennametal Inc Earth boring drill bit
US3145790A (en) * 1963-06-10 1964-08-25 Jersey Prod Res Co Drag bit
US3199617A (en) * 1962-12-03 1965-08-10 Thomas A White Drilling bit

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2740612A (en) * 1954-02-23 1956-04-03 Phipps Orville Two-arm rotary drill bit
GB900099A (en) * 1958-08-22 1962-07-04 Salzgitter Maschinen Ag Improvements in or relating to boring crowns
US3127945A (en) * 1960-03-02 1964-04-07 Jersey Prod Res Co Drag bit
US3106973A (en) * 1960-09-26 1963-10-15 Christensen Diamond Prod Co Rotary drill bits
US3199617A (en) * 1962-12-03 1965-08-10 Thomas A White Drilling bit
US3140748A (en) * 1963-05-16 1964-07-14 Kennametal Inc Earth boring drill bit
US3145790A (en) * 1963-06-10 1964-08-25 Jersey Prod Res Co Drag bit

Cited By (144)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0030558A1 (en) * 1979-06-19 1981-06-24 Syndrill Carbide Diamond Company Deep hole rock drill bit
EP0030558A4 (en) * 1979-06-19 1981-10-27 Syndrill Carbide Diamond Compa Deep hole rock drill bit.
FR2473106A1 (en) * 1979-11-19 1981-07-10 Gen Electric COMPOSITE DIAMOND COMPRESSES FOR TREPANS AND SAWS
EP0029535A1 (en) * 1979-11-19 1981-06-03 General Electric Company Compacts for diamond drill and saw applications
DE3147099A1 (en) * 1980-12-01 1982-07-01 Christensen, Inc., 84115 Salt Lake City, Utah "TURNING WORKING DRILL BIT"
FR2538442A1 (en) * 1982-12-23 1984-06-29 Charbonnages De France JET ASSISTED ROTATING FORTIFIER
EP0114016A1 (en) * 1982-12-23 1984-07-25 Etablissement public dit: CHARBONNAGES DE FRANCE Drill bit for combined rotary and jet drilling
US4535853A (en) * 1982-12-23 1985-08-20 Charbonnages De France Drill bit for jet assisted rotary drilling
DE3347696A1 (en) * 1983-12-31 1985-07-11 Bergwerksverband Gmbh, 4300 Essen Device for the rotary drilling of rock
US4928777A (en) * 1984-12-22 1990-05-29 Nl Petroleum Products Limited Cutting elements for rotary drill bits
EP0442675A2 (en) * 1990-02-10 1991-08-21 Tri-State Oil Tool (UK), a division of Baker Hughes Limited Milling tool for well side-tracking
EP0442675A3 (en) * 1990-02-10 1992-09-16 Tri-State Oil Tool (Uk), A Division Of Baker Hughes Limited Milling tool for well side-tracking
US5199513A (en) * 1990-02-10 1993-04-06 Tri-State Oil Tool (Uk) Side-tracking mills
US5289876A (en) * 1992-07-28 1994-03-01 Natural Reserves Group, Inc. Completing wells in incompetent formations
US6450271B1 (en) 2000-07-21 2002-09-17 Baker Hughes Incorporated Surface modifications for rotary drill bits
BE1015000A5 (en) 2000-07-21 2004-08-03 Baker Hughes Inc Turning drill and method of realization.
US20080011522A1 (en) * 2005-11-21 2008-01-17 Hall David R Retaining Element for a Jack Element
US8205688B2 (en) 2005-11-21 2012-06-26 Hall David R Lead the bit rotary steerable system
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
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
US8950517B2 (en) 2005-11-21 2015-02-10 Schlumberger Technology Corporation Drill bit with a retained jack element
US8528664B2 (en) 2005-11-21 2013-09-10 Schlumberger Technology Corporation Downhole mechanism
US20070272443A1 (en) * 2005-11-21 2007-11-29 Hall David R Downhole Steering
US20090255733A1 (en) * 2005-11-21 2009-10-15 Hall David R Lead the Bit Rotary Steerable System
US8522897B2 (en) 2005-11-21 2013-09-03 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US8408336B2 (en) 2005-11-21 2013-04-02 Schlumberger Technology Corporation Flow guide actuation
US8297378B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Turbine driven hammer that oscillates at a constant frequency
US8297375B2 (en) 2005-11-21 2012-10-30 Schlumberger Technology Corporation Downhole turbine
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
US20080173482A1 (en) * 2005-11-21 2008-07-24 Hall David R Drill Bit
US8225883B2 (en) 2005-11-21 2012-07-24 Schlumberger Technology Corporation Downhole percussive tool with alternating pressure differentials
US20070114067A1 (en) * 2005-11-21 2007-05-24 Hall David R Drill Bit Assembly with an Indenting Member
US7424922B2 (en) 2005-11-21 2008-09-16 Hall David R Rotary valve for a jack hammer
US20080302572A1 (en) * 2005-11-21 2008-12-11 Hall David R Drill Bit Porting System
US8020471B2 (en) 2005-11-21 2011-09-20 Schlumberger Technology Corporation Method for manufacturing a drill bit
US7967082B2 (en) 2005-11-21 2011-06-28 Schlumberger Technology Corporation Downhole mechanism
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
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
US20110048811A1 (en) * 2005-11-21 2011-03-03 Schlumberger Technology Corporation Drill bit with a retained jack element
US7753144B2 (en) * 2005-11-21 2010-07-13 Schlumberger Technology Corporation Drill bit with a retained jack element
US7533737B2 (en) 2005-11-21 2009-05-19 Hall David R Jet arrangement for a downhole drill bit
US20100065334A1 (en) * 2005-11-21 2010-03-18 Hall David R Turbine Driven Hammer that Oscillates at a Constant Frequency
US20100000794A1 (en) * 2005-11-21 2010-01-07 Hall David R Lead the Bit Rotary Steerable Tool
US7641002B2 (en) 2005-11-21 2010-01-05 Hall David R Drill bit
US7559379B2 (en) 2005-11-21 2009-07-14 Hall David R Downhole steering
US20090183919A1 (en) * 2005-11-21 2009-07-23 Hall David R Downhole Percussive Tool with Alternating Pressure Differentials
US7617886B2 (en) 2005-11-21 2009-11-17 Hall David R Fluid-actuated hammer 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
US8360174B2 (en) 2006-03-23 2013-01-29 Schlumberger Technology Corporation Lead the bit rotary steerable tool
US7661487B2 (en) 2006-03-23 2010-02-16 Hall David R Downhole percussive tool with alternating pressure differentials
US20070229232A1 (en) * 2006-03-23 2007-10-04 Hall David R Drill Bit Transducer Device
US7762353B2 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Downhole valve mechanism
US20070229304A1 (en) * 2006-03-23 2007-10-04 Hall David R Drill Bit with an Electrically Isolated Transmitter
US8316964B2 (en) 2006-03-23 2012-11-27 Schlumberger Technology Corporation Drill bit transducer device
US20090133936A1 (en) * 2006-03-23 2009-05-28 Hall David R Lead the Bit Rotary Steerable Tool
USD620510S1 (en) 2006-03-23 2010-07-27 Schlumberger Technology Corporation Drill bit
US20080142263A1 (en) * 2006-03-23 2008-06-19 Hall David R Downhole Valve Mechanism
US7419016B2 (en) 2006-03-23 2008-09-02 Hall David R Bi-center drill bit
US8130117B2 (en) 2006-03-23 2012-03-06 Schlumberger Technology Corporation Drill bit with an electrically isolated transmitter
US7694756B2 (en) 2006-03-23 2010-04-13 Hall David R Indenting member for a drill bit
US8011457B2 (en) 2006-03-23 2011-09-06 Schlumberger Technology Corporation Downhole hammer assembly
US7484576B2 (en) 2006-03-23 2009-02-03 Hall David R Jack element in communication with an electric motor and or generator
US7571780B2 (en) 2006-03-24 2009-08-11 Hall David R Jack element for a drill bit
US8596381B2 (en) 2006-08-11 2013-12-03 David R. Hall Sensor on a formation engaging member of a drill bit
US8714285B2 (en) 2006-08-11 2014-05-06 Schlumberger Technology Corporation Method for drilling with a fixed bladed bit
US10378288B2 (en) 2006-08-11 2019-08-13 Schlumberger Technology Corporation Downhole drill bit incorporating cutting elements of different geometries
US9915102B2 (en) 2006-08-11 2018-03-13 Schlumberger Technology Corporation Pointed working ends on a bit
US9708856B2 (en) 2006-08-11 2017-07-18 Smith International, Inc. Downhole drill bit
US7886851B2 (en) 2006-08-11 2011-02-15 Schlumberger Technology Corporation Drill bit nozzle
US20110042150A1 (en) * 2006-08-11 2011-02-24 Hall David R Roof Mining Drill 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
US8622155B2 (en) 2006-08-11 2014-01-07 Schlumberger Technology Corporation Pointed diamond working ends on a shear bit
US8616305B2 (en) 2006-08-11 2013-12-31 Schlumberger Technology Corporation Fixed bladed bit that shifts weight between an indenter and cutting elements
US20090000828A1 (en) * 2006-08-11 2009-01-01 Hall David R Roof Bolt Bit
US20100089648A1 (en) * 2006-08-11 2010-04-15 Hall David R Fixed Bladed Bit that Shifts Weight between an Indenter and Cutting Elements
US8590644B2 (en) 2006-08-11 2013-11-26 Schlumberger Technology Corporation Downhole drill bit
US8573331B2 (en) 2006-08-11 2013-11-05 David R. Hall Roof mining 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
US20090133938A1 (en) * 2006-08-11 2009-05-28 Hall David R Thermally Stable Pointed Diamond with Increased Impact Resistance
US8215420B2 (en) 2006-08-11 2012-07-10 Schlumberger Technology Corporation Thermally stable pointed diamond with increased impact resistance
US8567532B2 (en) 2006-08-11 2013-10-29 Schlumberger Technology Corporation Cutting element attached to downhole fixed bladed bit at a positive rake angle
US8240404B2 (en) 2006-08-11 2012-08-14 Hall David R Roof bolt bit
US20090294182A1 (en) * 2006-08-11 2009-12-03 Hall David R Degradation Assembly
US20080035388A1 (en) * 2006-08-11 2008-02-14 Hall David R Drill Bit Nozzle
US8449040B2 (en) 2006-08-11 2013-05-28 David R. Hall Shank for an attack tool
US20100059289A1 (en) * 2006-08-11 2010-03-11 Hall David R Cutting Element with Low Metal Concentration
US8434573B2 (en) 2006-08-11 2013-05-07 Schlumberger Technology Corporation Degradation assembly
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
US7527110B2 (en) 2006-10-13 2009-05-05 Hall David R Percussive drill bit
US10029391B2 (en) 2006-10-26 2018-07-24 Schlumberger Technology Corporation High impact resistant tool with an apex width between a first and second transitions
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
US7600586B2 (en) 2006-12-15 2009-10-13 Hall David R System for steering a drill string
US7392857B1 (en) 2007-01-03 2008-07-01 Hall David R Apparatus and method for vibrating a drill bit
US20080156536A1 (en) * 2007-01-03 2008-07-03 Hall David R Apparatus and Method for Vibrating a Drill Bit
USD678368S1 (en) 2007-02-12 2013-03-19 David R. Hall Drill bit with a pointed cutting element
USD674422S1 (en) 2007-02-12 2013-01-15 Hall David R Drill bit with a pointed cutting element and a shearing 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
US7866416B2 (en) 2007-06-04 2011-01-11 Schlumberger Technology Corporation Clutch for a jack element
US8307919B2 (en) 2007-06-04 2012-11-13 Schlumberger Technology Corporation Clutch for a jack element
US8122980B2 (en) 2007-06-22 2012-02-28 Schlumberger Technology Corporation Rotary drag bit with pointed cutting elements
US20080314647A1 (en) * 2007-06-22 2008-12-25 Hall David R Rotary Drag Bit with Pointed Cutting Elements
US8499857B2 (en) 2007-09-06 2013-08-06 Schlumberger Technology Corporation Downhole jack assembly sensor
US20100108385A1 (en) * 2007-09-06 2010-05-06 Hall David R Downhole Jack Assembly Sensor
US20090065251A1 (en) * 2007-09-06 2009-03-12 Hall David R Downhole Jack Assembly Sensor
US7967083B2 (en) 2007-09-06 2011-06-28 Schlumberger Technology Corporation Sensor for determining a position of a jack element
US7721826B2 (en) 2007-09-06 2010-05-25 Schlumberger Technology Corporation Downhole jack assembly sensor
US8292372B2 (en) 2007-12-21 2012-10-23 Hall David R Retention for holder shank
US20090160238A1 (en) * 2007-12-21 2009-06-25 Hall David R Retention for Holder Shank
US8931854B2 (en) 2008-04-30 2015-01-13 Schlumberger Technology Corporation Layered polycrystalline diamond
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
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
US8418784B2 (en) 2010-05-11 2013-04-16 David R. Hall Central cutting region of a drilling head assembly
US8820440B2 (en) 2010-10-01 2014-09-02 David R. Hall Drill bit steering assembly
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
US20150368976A1 (en) * 2014-06-19 2015-12-24 Tercel Ip Ltd Fixed-cutter drill bits generating cores
US20160123086A1 (en) * 2014-11-05 2016-05-05 Yan Yan Rao Anti-balling Drill Bit
US10072463B2 (en) * 2014-11-05 2018-09-11 Yan Yan Rao Anti-balling drill bit positioned relative to fixed blades presenting fixed cutting inserts
RU2581059C1 (en) * 2015-03-26 2016-04-10 ООО "Камышинский завод бурового инструмента" (ООО "КЗБИ") Percussion-rotary drilling bit
US20220136329A1 (en) * 2019-03-01 2022-05-05 Bly Ip Inc. High speed drilling system and methods of using same

Similar Documents

Publication Publication Date Title
US3301339A (en) Drill bit with wear resistant material on blade
US4408671A (en) Roller cone drill bit
US3055443A (en) Drill bit
US3542142A (en) Method of drilling and drill bit therefor
US2719026A (en) Earth boring drill
US3126067A (en) Roller bit with inserts
US3180440A (en) Drag bit
US3140748A (en) Earth boring drill bit
US5090492A (en) Drill bit with vibration stabilizers
US2362529A (en) Side tracking apparatus
US3548959A (en) Relief-type jet bits
US3059708A (en) Abrasion resistant stepped blade rotary drill bit
US3346060A (en) Rotary-air-percussion, stabilizer and reamer drill bit of its own true gauge
US2999541A (en) Milling tool
NO161870B (en) BOREA SCHEME.
US3163243A (en) Underdrilling bit
EP0676000A4 (en) Drill bit having polycrystalline diamond compact cutter with spherical first end opposite cutting end.
US3433331A (en) Diamond drill bit
US6547017B1 (en) Rotary drill bit compensating for changes in hardness of geological formations
US8307921B2 (en) Drilling apparatus
US3137355A (en) Insert bit structure
US3417829A (en) Conical jet bits
US20140060934A1 (en) Cutting insert for a rock drill bit
US3127945A (en) Drag bit
US3100544A (en) Drilling device