EP0259872B1 - Drehbohrmeissel mit grossen Schneidelementen und einem Flüssigkeitsstrahl für jedes Schneidelement - Google Patents

Drehbohrmeissel mit grossen Schneidelementen und einem Flüssigkeitsstrahl für jedes Schneidelement Download PDF

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Publication number
EP0259872B1
EP0259872B1 EP87113231A EP87113231A EP0259872B1 EP 0259872 B1 EP0259872 B1 EP 0259872B1 EP 87113231 A EP87113231 A EP 87113231A EP 87113231 A EP87113231 A EP 87113231A EP 0259872 B1 EP0259872 B1 EP 0259872B1
Authority
EP
European Patent Office
Prior art keywords
bit
cutter
nozzle
jet
chip
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
EP87113231A
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English (en)
French (fr)
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EP0259872A3 (en
EP0259872A2 (de
Inventor
William R. Trujillo
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.)
Baker Hughes Oilfield Operations LLC
Original Assignee
Eastman Christensen Co
Eastman Teleco 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.)
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Publication date
Application filed by Eastman Christensen Co, Eastman Teleco Co filed Critical Eastman Christensen Co
Publication of EP0259872A2 publication Critical patent/EP0259872A2/de
Publication of EP0259872A3 publication Critical patent/EP0259872A3/en
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Publication of EP0259872B1 publication Critical patent/EP0259872B1/de
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Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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
    • E21B10/567—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts
    • E21B10/5671—Button-type inserts with preformed cutting elements mounted on a distinct support, e.g. polycrystalline inserts with chip breaking arrangements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK 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

Definitions

  • the invention is related to a rotating bit as set forth in the pre-characterising portion of claim 1.
  • Such prior art cutters include impregnated diamond blade cutters, sintered diamond compact cutters, such as manufactured by General Electric Co. under the trademark “Compax”, are limited in size, typically being equal to or less than 13.3 mm in diameter. Therefore, in order to obtain the cutter sizes required or desirable for sticky drilling, impregnated diamond elements are used such as shown by US-A-3 153 458.
  • the invention provides a rotary drill bit as characterized by the features of claim 1. Further embodiments are included in claims 2 - 12.
  • Figure 1 is a top plan view of an inside of a mold from which a matrix bit incorporating the invention is fabricated.
  • Figure 2 is a diagrammatic cross-sectional view of a bit manufactured from the mold plan shown in Figure 1.
  • Figure 3 is a diagrammatic depiction of the direction of hydraulic flow with respect to the cutter face and chip of a single cutter as depicted in Figures 1 and 2.
  • Figure 4 is a diagrammatic side sectional view of the depiction of Figure 3.
  • Figure 5 is a perspective view of a single cutter as shown in Figures 1-4.
  • An improved rotating drag bit for cutting plastic, sticky, water reactive clays and shales is devised by providing a plurality of large diamond cutters having a circular cutting face equal to or in excess of 0.75 inch in diameter.
  • the cutters are approximately one inch in diameter or larger.
  • Each large cutter is provided with at least one hydraulic nozzle which in turn provides a directed hydraulic flow at the corresponding cutter face.
  • the directed hydraulic flow is positioned to apply a force to the chip which tends to hydraulically separate the chip away from the cutter face.
  • the hydraulic flow is positioned with respect to the chip so as to apply an off-center torque to the chip which is used to peel the chip away from the cutter face and toward the gage of the bit.
  • the nozzle defines a jet which is characterized by a direction and velocity of hydraulic fluid determined by the jet characteristics.
  • the core is generally symmetric about its longitudinal axis and has a length along the longitudinal axis and width perpendicular thereto.
  • the point of the jet most distant from the nozzle defines an impact point of the jet against the formation, the chip and/or cutter face.
  • the longitudinal axis of the jet is chosen so that at least a portion of the jet can lie between the cutter face and the chip as it is being peeled from the cutter. Hydraulic removal of the chips is further facilitated by a plurality of junk slots having a contoured compound surface.
  • a rotating drill bit is provided with a large diamond compact slug, typically of one to two inches in diameter or greater, each of which is provided with at least one hydraulic nozzle.
  • Hydraulic fluid is directed under pressure from the nozzle to a predetermined point with respect to the corresponding large diamond cutter and its corresponding chip.
  • the fluid flow from the nozzle is focussed or has a point of maximum impulsive impact at a predetermined point positioned with respect to the rock chip cut by the corresponding cutter so that a force is applied to the chip to separate it from the diamond cutter by hydraulic differential unloading and/or applying an unbalanced torque to the chip.
  • the focal point of the stream of hydraulic fluid from the nozzle is directed at a point at or near the base and to the inside of attachment or adhesion of the rock chip to the face of the diamond cutter.
  • Figure 1 What is shown in Figure 1 is a plan view of the settings of the large diamond compact cutters on the face of a bit as seen looking into a mold in which such a diamond bit would be made by matrix infiltration.
  • the bit generally denoted by reference numeral 10
  • the bit is characterized by an exterior cylindrical surface or gage 12 terminated on its lowermost portion by a bit face, generally denoted by reference numeral 14.
  • gage 12 defines a plurality of junk slots 16 and 18.
  • Junk slots 16 are distinguishable from junk slots 18 in that junk slots 16 have a uniform contour as opposed to a contoured or compound surface within junk slots 18 as will be described below.
  • FIG. 1 a 12 1/4 inch diameter bit is illustrated in which nine large cutters 21-29 will be formed.
  • each cutter is shown in midline cross-sectional view with the diamond cutter in place.
  • the diamond slugs may be fixed or brazed into the bit in a later step, and would not be seen in place in the mold as depicted in Figure 1.
  • Figure 1 illustrates the diamond cutters in place as would be seen looking downward through the diamond bit toward the rock formation. In reality in a top plan view of a mold, only the pockets into which the diamond slugs were later brazed would be seen.
  • each cutter is a nozzle 31-39 which provides a directed flow as also described more completely below.
  • Nozzle 31 thus provides directed flow for cutter 21, nozzle 32 for cutter 22 and so forth through nozzle 39 and cutter 29.
  • a plurality of gage cutters 40 are defined within the shoulder and gage of bit 10 as better depicted and described below in connection with Figure 2, but which are also illustrated in Figure 1 in a sometimes overlying relationship. The depiction in Figure 1 of gage cutters 40 appears to be overlying since the cutters, which may be vertically separated, are superimposed in the diagrammatic view of Figure 1.
  • gage defining cutters 40 are comprised of conventionally fabricated Stratapax or Compax cutters and can, by virtue of their relative scale to cutters 21-29, provide a relative feel for the sizes of cutters 21-29.
  • gage defining cutters 40 usually represented the largest integral diamond compacts then available for cutting in shale or plastic formations.
  • gage defining cutters 40 now serve only a secondary cutting function as gage defining cutters.
  • Cutter 24 is chosen for the purposes of example.
  • Cutter 24 comprises a tungsten carbide slug 44 1.50 inches in diameter and approximately 0.3 inch thick.
  • Mounted in the face of the slug 44 is an integral diamond compact table 46.
  • Diamond table 46 and slug 44 are manufactured and bonded together within a diamond press and are sold as such a unit by De Beers of South Africa.
  • Diamond table 46 has a diameter substantially equal to that of slug 44.
  • Substrate or carrier 45 is brazed into pocket 48.
  • Slug 44 is then brazed into pocket 48 in front of substrate 45.
  • Pocket 48 is formed in an island 50 which is a grooved projection of the basic body 14.
  • De Beers supplies slug 44 and table 46 as an integral unit. This unit has a longitudinal thickness of approximately 8 mm (0.315 inch) and lacks sufficient thickness for adequate shock protection and load resistance.
  • cutters 21-29 of the embodiment of Figure 1 have a predetermined rake angle of diamond table 46 as determined by a milled-in rake angle of island 50.
  • each cutter 21-29 has been shown only in a midline section for the sake of clarity. Therefore it must be kept in mind that portions of the face of diamond table 46 actually extend both in front of and behind the midsection line shown in Figure 1 for each cutter 21-29 by an amount depending on the rake angle of each cutter.
  • the preferred embodiment is a diamond compact disc brazed into a pocket with a support or carrier.
  • the cutter can have different shapes, e.g. triangular, hexagonal, square, or octagonal.
  • the cutter can be composed of thermally stable diamond or some other material such as silicon carbide, tungsten carbide, or boron carbide.
  • the cutter can be furnaced with the bit body in order to attach it to the bit. What is disclosed here is a large cutter with at least one directed nozzle providing cleaning and cooling of the cutter.
  • cutter 24 and nozzle 34 depicted in Figure 1 Listed below in Table 1 is a summary of cutter locations. The locations listed above are the locations which are machined in the graphite mold from which the bit is made. After furnacing, these locations are reduced a small amount due to shrinkage upon cooling.
  • Cutter 24 has the center of its midline section of diamond table 46 at a radial distance of 3.75 inch from the center of bit 10 prior to shrinkage. Taking the center of cutter 21 as an arbitrary reference point of 0 degrees, the azimuthal position of the center of cutter 24 appears at an angular position of 28 degrees.
  • Face 46 of cutter 24 is not parallel to a radius, but has a side rake of 5 degrees.
  • cutter 24 has been rotated so that face 46 is not aligned with the radius but is rotated or canted counterclockwise by 5 degrees in a plane parallel to the bit profile.
  • the back rake of cutter 24 is 10 degrees, although not shown in the figures.
  • the diamond face 46 of cutter 24 were shown in three dimensions, a rotation perpendicular to the bit profile as shown in Figure 1 of 10 degrees would be observed.
  • Nozzle 34 has its center at a radial displacement of 3.20 inch from the center of bit 10.
  • Arrow 68 diagrammatically represents the direction of hydraulic flow of nozzle 34.
  • the azimuthal position of the center of nozzle 34 is at an azimuthal angle of 14 degrees, as denoted by angle alpha in Table 2, again from a reference line of the face of cutter 1.
  • the angular offset of the direction of hydraulic flow denoted by arrow 68 is then 61 degrees offset from the reference direction.
  • nozzle 34 is tilted from the vertical axis, the longitudinal axis of bit 10, by 35 degrees in a direction which is perpendicular to the plane of the drawing of Figure 1 .
  • These two angular orientations combined with the 61 degree offset therefore specify that the point, denoted by reference numeral 66, at which arrow 68 impacts the formation.
  • Point 66 is at the base of and in front of diamond surface 46 of cutter 24.
  • the physical significance of arrow 68 and its corresponding point 66 is understood as follows.
  • FIG. 3 is a plan diagrammatic view of a cutter, such as cutter 24.
  • Substrate 44 behind and bonded to diamond table 46 is shown in diagrammatic top plan view and immediately behind a chip 56 being cut from the rock formation.
  • chip 56 is sheared from the rock formation, generally denoted by reference numeral 58. Since formation 58 is sticky or plastic, chip 56 remains substantially intact and will generally move upward across diamond face 46 of cutter 24 and normally tends to adhere to face 46.
  • Nozzle 34 corresponding to cutter 24, provides a directed flow of hydraulic fluid to form a jet 60 shown in Figure 4.
  • Jet 60 is characterized by a region of hydraulic flow which has a direction and velocity principally determined by nozzle 34.
  • core 61 has a length denoted by dimension 62 in Figure 4 of four to seven times the outer diameter of the orifice of nozzle 34 and a pressure cone associated with the jet with a width, denoted by reference numeral 64 approximately two times the outer diameter of the orifice of nozzle 34.
  • core 61 has a tip 66 which defines an impact point of jet 60.
  • core 61 is generally symmetric about a longitudinal axis 68 from the center of nozzle 34 to impact point 66. Impact point 66 can be characterized as the point of primary or maximized force furtherest away from the orifice of the corresponding nozzle.
  • axis 68 of jet 60 is directed to the base of chip 56 so that the impact point will lie near the base of chip 56, typically within the lower half of diamond face 46 and offset from the center of chip 56 or face 46.
  • impact point 66 will lie at a distance of 0.4 to 0.7 inches away from the center of gravity 70 of chip 56 as depicted in Figure 4. This imparts or tends to impart a force which pries off chip 56 from diamond face 46 as depicted in Figures 3 and 4. Otherwise, chip 56 would generally be tightly adhered to diamond face 46.
  • a torque also tends to be applied to chip 56 by virtue of the moment arm between impact point 66 and center of gravity 70. Therefore, chip 56 also tends to be twisted off or peeled off face 46.
  • torque applied to each chip 56 on each cutter and chip is directed to peel chips 56 toward gage 12 of bit 10.
  • Figure 2 is a diagrammatic cross-sectional depiction of half of the profile of bit 10 showing each of the circular diamond faces 46 of cutters 21-29 superimposed on the profile as would be obtained after a full revolution of bit 10.
  • cutters 21-29 provide overlapping coverage from center line 72 of bit 10 to gage 12.
  • the outermost cutters 27-29 provide triple redundancy at gage 12 where cutting rates and impact shocks are generally highest.
  • the density of cutter overlap can be seen to increase toward gage 12. In other words, a greater fraction of the cutting face of cutter 26 overlaps with the cutting faces of cutters 27-29 than does the degree of overlap between the cutting faces of cutters 21 and 22.
  • Figure 2 also illustrates the vertical dispersion of gage protection cutters 40.
  • Each of the full cutters 40 is provided with triple redundancy on bit 10 with the exception of fractional cutters 40a, which have been cut by laser cutting or EDM to comprise a portion of the full disc with a flat edge 74 directed outwardly to define gage 12.
  • a sixfold redundancy of cutters 40a is provided on bit 10. Cutters 40 and 40a do not actively cut the formation. They insure the hole size is maintained. They do not cut the bottomhole, and do not require direct cleaning.
  • cutter 24 As is each cutter, is associated with an imaginary line 76 along which the center of gravity of chip 56 will be positioned. The exact point of the center of gravity of chip 56 along line 76 will depend upon the depth of cut as well as upon the amount of cutter remaining after wear. Thus line 76 represents the locus of the center of gravity of chip 56 over time. Similarly, the projection of axis 68 of hydraulic jet 60 onto the cutting face of cutter 24 defines an imaginary line 78.
  • line 78 which is indicative of the center of effort of jet 60, lies inboard of line 76 representing the position on the center of gravity of chip 56.
  • line 78 representative of the center force of jet 60 lies inboard of its corresponding line 76.
  • nozzles 31-39 are replaceable from the exterior of bit face 14. Therefore, sufficient space must be provided between each nozzle 31-39 and it corresponding cutter 21-29 to allow insertion and removal of the nozzle and to allow the use of appropriate tools.
  • the nozzles are permanently fixed or are removable from the interior of bit 10, it may be possible that the variation of the distance between impact point 66 and corresponding cutter faces 46 as shown in Figure 1 would not occur. The fluid can actually impact cutter face 46 between the cutter and chip 56 if so desired.

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  • Engineering & Computer Science (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Fluid Mechanics (AREA)
  • Mechanical Engineering (AREA)
  • Environmental & Geological Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Processing Of Stones Or Stones Resemblance Materials (AREA)
  • Milling Processes (AREA)
  • Earth Drilling (AREA)

Claims (12)

  1. Drehbohrmeißel (10) für Schneidarbeiten in nachgiebigen Formationen (58) mit einer Mehrzahl von polykristallinen Diamantschneidgliedern (21-29,40,42), von denen jedes Schneidglied einen Span (56) von der Formation (58) abtrennt, dadurch gekennzeichnet, daß der Drehbohrmeißel zumindest ein großes Schneidglied (21-29), das eine Diamantschneidfläche (46) zumindest von der Größe eines Kreises mit 19 mm (0.75") Durchmesser hat, und zumindest eine Düse (31-39) zur Bildung einer zu dem großen Schneidelement (21-29) gerichteten hydraulischen Strömung aufweist, wobei die Strömung so gerichtet und konfiguriert ist, daß sie auf den von dem großen Schneidelement (21-29) abgetrennten Span (56) eine Kraft ausübt, die bestrebt ist, den Span (56) von der Schneidfläche (46) des großen Schneidelementes (21-29) abzuschälen.
  2. Drehbohrmeißel (10) gemäß Anspruch 1, bei dem der Drehbohrmeißel (10) eine Mehrzahl von großen Schneidelementen (21-29) und eine Mehrzahl von Düsen (31-39) aufweist, wobei für jedes große Schneidelement (21-29) zumindest eine Düse (31-39) vorgesehen ist, welche die auf die Schneidfläche (46) jedes der großen Schneidelemente (21-29 gerichtete hydraulische Strömung erzeugt.
  3. Drehbohrmeißel (10) nach Anspruch 1, wobei zumindest eine Düse (31-39) hydraulische Strömung auf die Schneidfläche (46) zumindest eines großen Schneidelementes (21-29) an einer Stelle richtet, die nahe dem Schwerpunkt (70) des Spans (56) gelegen ist.
  4. Drehbohrmeißel (10) nach Anspruch 2, bei dem die Düsen hydraulische Strömungen auf die Schneidflächen (46) jedes der großen Schneidelemente (21-29) an Stellen richten, die nahe den Schwerpunkten (70) der Späne (56) gelegen sind.
  5. Drehbohrmeißel nach Anspruch 3, bei dem der Drehbohrmeißel ein Zentrum (72) und eine Kalibrierfläche (12) aufweist und zumindest eine Düse (31-39) eine hydraulische Strömung auf den Span (56) nahe dessen Schwerpunkt (70) und radial innerhalb zum Schwerpunkt (70) des Spans (56) in bezug auf das Zentrum (72) des Drehbohrmeißels richtet, wodurch auf den Span (56) ein Drehmoment ausgeübt wird, das bestrebt ist, den Span (56) von der Schneidfläche (46) zumindest eines großen Schneidgliedes (21-29) in Richtung zur Kalibrierfläche (12) des Drehbohrmeißels (10) hin abzuschälen.
  6. Drehbohrmeißel nach Anspruch 4, bei dem der Drehbohrmeißel (10) ein Zentrum (72) und eine Kalibrierfläche (12) aufweist und die Düsen (31-39) hydraulische Strömungen auf die Späne (56) nahe deren Schwerpunkte (70) und radial innerhalb zu den Schwerpunkten (70) der Späne (56) in bezug auf das Zentrum (72) des Drehbohrmeißels (10) richten, wodurch auf die Späne (56) ein Drehmoment ausgeübt wird, das bestrebt ist, die Späne (56) von den Schneidflächen (46) der großen Schneidelemente (21-29) in Richtung auf die Kalibrierfläche (12) des Drehbohrmeißels (10) hin abzuschälen.
  7. Drehbohrmeißel (10) nach Anspruch 1 oder 2, bei dem die gerichtete Strömung einer Düse durch einen Düsenstrahl (60) charakterisiert ist, der Düsenstrahl (60) durch die hydraulische Strömung in einer Richtung und mit einer Geschwindigkeit definiert ist, die primär durch die Düse (31-39) bestimmt sind, und eine Längsachse (68), eine Breite (64) senkrecht zu der Längsachse (68) und eine Länge (62) in Richtung der Längsachse (68) aufweist, wobei der Punkt auf der Längsachse (68) des Düsenstrahls (60), der am weitesten von der Düse (31-39) entfernt ist, als Aufprallpunkt (66) des Düsenstrahls (60) definiert ist und der Aufprallpunkt (66) des Düsenstrahls (60) auf eine Stelle gerichtet ist, die nahe dem mit der Gesteinsformation (58) verbundenen Teil des Spans (56) gelegen ist.
  8. Drehbohrmeißel (10) nach Anspruch 1 oder 2, bei dem die gerichtete Strömung der Düse (31-39) durch einen Düsenstrahl (60) charakterisiert ist, der Düsenstrahl (60) durch Strömen eines hydraulischen Mediums in einer Richtung und mit einer Geschwindigkeit definiert ist, die primär durch die Düse (31-39) bestimmt ist, wobei der Düsenstrahl (60) einen Kern (61) aufweist, der eine Länge (62) hat, im wesentlichen symmetrisch zur Längsachse (68) angeordnet ist und einen Druckkegel mit einer senkrecht zur Längsachse verlaufenden Breite (64) hat, wobei der Punkt auf der Längsachse des Düsenstrahls (60), der von der Düse (31-39) am weitesten entfernt ist, als Aufprallpunkt (66) des Düsenstrahls (60) definiert und der Aufprallpunkt (66) des Düsenstrahls (60) auf eine Stelle gerichtet ist, die nahe dem mit der Gesteinsformation verbundenen Teil des Spans (56) gelegen ist.
  9. Drehbohrmeißel (10) nach Anspruch 7 oder 8, bei dem der Aufprallpunkt des Düsenstrahls (60) in einer Entfernung von 100-178 mm (0.4-0.7") zum Schwerpunkt (70) des Spans (56) liegt.
  10. Drehbohrmeißel (10) nach Anspruch 7 oder 8, bei dem die Länge (62) des Düsenstrahls (60) das 4- bis 7-fache des Außendurchmessers der Austrittsöffnung einer Düse (31-39) beträgt.
  11. Drehbohrmeißel nach Anspruch 7 oder 8, bei dem die Breite (64) des Düsenstrahls (60) annähernd das Zweifache des Außendurchmessers der Austrittsöffnung einer Düse (31-39) beträgt.
  12. Drehbohrmeißel nach Anspruch 7 oder 8, bei dem die Längsachse (68) des Düsenstrahls (60) zumindest einen Punkt hat, der zwischen dem Span (56) und der Schneidfläche (46) des zugehörigen Schneidelementes (21-29) gelegen ist.
EP87113231A 1986-09-11 1987-09-10 Drehbohrmeissel mit grossen Schneidelementen und einem Flüssigkeitsstrahl für jedes Schneidelement Expired - Lifetime EP0259872B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US90616986A 1986-09-11 1986-09-11
US906169 1986-09-11

Related Child Applications (1)

Application Number Title Priority Date Filing Date
EP91111602.8 Division-Into 1987-09-10

Publications (3)

Publication Number Publication Date
EP0259872A2 EP0259872A2 (de) 1988-03-16
EP0259872A3 EP0259872A3 (en) 1989-10-25
EP0259872B1 true EP0259872B1 (de) 1992-08-19

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ID=25422035

Family Applications (2)

Application Number Title Priority Date Filing Date
EP19910111602 Withdrawn EP0452999A3 (en) 1986-09-11 1987-09-10 A rotating bit with junk slots in its gage
EP87113231A Expired - Lifetime EP0259872B1 (de) 1986-09-11 1987-09-10 Drehbohrmeissel mit grossen Schneidelementen und einem Flüssigkeitsstrahl für jedes Schneidelement

Family Applications Before (1)

Application Number Title Priority Date Filing Date
EP19910111602 Withdrawn EP0452999A3 (en) 1986-09-11 1987-09-10 A rotating bit with junk slots in its gage

Country Status (5)

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EP (2) EP0452999A3 (de)
JP (1) JPS63134782A (de)
CA (1) CA1295321C (de)
DE (1) DE3781226T2 (de)
NO (1) NO873803L (de)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5172778A (en) * 1991-11-14 1992-12-22 Baker-Hughes, Inc. Drill bit cutter and method for reducing pressure loading of cutters
US5265685A (en) * 1991-12-30 1993-11-30 Dresser Industries, Inc. Drill bit with improved insert cutter pattern
JPH0576584U (ja) * 1992-03-26 1993-10-19 アロン化成株式会社 曲管清掃具
US5592996A (en) * 1994-10-03 1997-01-14 Smith International, Inc. Drill bit having improved cutting structure with varying diamond density
JP2007118501A (ja) * 2005-10-31 2007-05-17 Tosei Kensetsu Kk 穿孔ビット装置及び穿孔機
WO2011146752A2 (en) 2010-05-20 2011-11-24 Baker Hughes Incorporated Methods of forming at least a portion of earth-boring tools, and articles formed by such methods

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4098363A (en) * 1977-04-25 1978-07-04 Christensen, Inc. Diamond drilling bit for soft and medium hard formations
US4303136A (en) * 1979-05-04 1981-12-01 Smith International, Inc. Fluid passage formed by diamond insert studs for drag bits
DE3039633C2 (de) * 1980-10-21 1983-08-18 Christensen, Inc., 84115 Salt Lake City, Utah Drehbohrmeißel, insbesondere für Tiefbohrungen
EP0182770A1 (de) * 1984-11-12 1986-05-28 DIAMANT BOART Société Anonyme Diamantbohrmeissel

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EP0452999A2 (de) 1991-10-23
NO873803D0 (no) 1987-09-11
DE3781226D1 (de) 1992-09-24
DE3781226T2 (de) 1993-03-25
EP0259872A3 (en) 1989-10-25
EP0259872A2 (de) 1988-03-16
EP0452999A3 (en) 1992-03-11
CA1295321C (en) 1992-02-04
JPS63134782A (ja) 1988-06-07
NO873803L (no) 1988-03-14

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