EP0449415A2 - Nach aussen gerichtete Düsen für Drehbohrmeissel - Google Patents

Nach aussen gerichtete Düsen für Drehbohrmeissel Download PDF

Info

Publication number
EP0449415A2
EP0449415A2 EP91301389A EP91301389A EP0449415A2 EP 0449415 A2 EP0449415 A2 EP 0449415A2 EP 91301389 A EP91301389 A EP 91301389A EP 91301389 A EP91301389 A EP 91301389A EP 0449415 A2 EP0449415 A2 EP 0449415A2
Authority
EP
European Patent Office
Prior art keywords
side wall
stream
cutting elements
bit
drill bit
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.)
Withdrawn
Application number
EP91301389A
Other languages
English (en)
French (fr)
Other versions
EP0449415A3 (en
Inventor
Stuart R. Moffitt
Craig R. Ivie
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.)
Camco International Inc
Original Assignee
Camco International Inc
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
Priority claimed from US07/502,046 external-priority patent/US5029656A/en
Priority claimed from US07/613,241 external-priority patent/US5096005A/en
Application filed by Camco International Inc filed Critical Camco International Inc
Publication of EP0449415A2 publication Critical patent/EP0449415A2/de
Publication of EP0449415A3 publication Critical patent/EP0449415A3/en
Withdrawn legal-status Critical Current

Links

Images

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
    • E21B10/08—Roller bits
    • E21B10/18—Roller bits characterised by conduits or nozzles for drilling fluids

Definitions

  • This invention relates to rotary drill bits for drilling oil wells and the like, and more particularly to an improved hydraulic action of drilling fluid against the roller cutters and particularly for the gage row of cutting elements and the corner surface of the earth formation being drilled.
  • Bennett in U.S. Patent No. 3,618,662 dated November 9, 1971 provides an extended enclosed passageway for directing the drilling fluid centrally of a roller cutter to a point adjacent the teeth at the bottom of the hole.
  • the flow channel for the drilling fluid after striking the side wall is directed downwardly while enclosed by the leg and the adjacent side wall until exiting closely adjacent the corner of the bore hole at the center of the roller cutter.
  • Feenstra in British Patent No. 1,104,310 dated February 21, 1965 utilizes a jet nozzle formed by an end of an extended tube to direct a fluid stream downwardly at an angle of 30 to 60 degrees with respect to the axis of bit rotation and underneath the roller cutter at the outer row of teeth in cutting engagement on the bottom of the hole.
  • a method to improve hole cleaning without extended flow channels is shown by Lopatin, et al in Russian Patent No. 258,972 published December 12, 1969 where a rolling cutter drill bit has nozzle passages directed downwardly and radially outwardly against the side wall of the bore hole to strike above the bottom corner, providing an inwardly sweeping fluid stream having a high velocity across the corner and bottom of the well bore tangential to the formation surface.
  • This design serves to clean solids away from the fracture openings at the surface of the formation, reduce the hold-down pressure on the fractured cuttings, and facilitate removal of dislodged cuttings by the high velocity fluid stream.
  • Childers, et al in U.S. Patent Nos. 4,516,642 and 4,546,837 employ a high velocity flow stream of fluid jet to first clean the cutting elements on a rolling cutter bit and then clean the formation at the bottom of the hole.
  • the fluid jet trajectory passes the cutter tangential to its outer periphery with a portion of the jet volume impinging on the cutting elements and the remainder of the jet volume striking downwardly on the hole bottom underneath the cutter body slightly forward of cutting elements engaging the formation.
  • the cleaning of both the cutter and the well bore bottom in separate and sequential actions provides improved penetration rates by attacking both bit balling and chip hold down.
  • 4,741,406 add a modification to this concept in which the fluid jet cleans both the rolling cutter teeth and the formation with an improved flow pattern.
  • High velocity fluid flows outwardly and downwardly to impinge upon the hole bottom, then turns upwardly while moving toward the outer periphery of the hole, and next returns upwardly alongside the original nozzle exit in a spaced outer return channel for enhanced transport of cuttings away from the hole bottom.
  • the primary object of this invention is to maximize the penetration rate of rolling cutter drill bits by providing a hydraulic nozzle configuration for delivering a high velocity stream of drilling fluid to sweep across the corner surface and bore hole bottom with a minimum loss of energy to maintain the highest stream velocity with a substantial portion of the stream cleaning the cutting elements and the formation at the contact engagement area of the cutting elements with the formation.
  • This invention positions the nozzle for directing the stream downwardly and closely adjacent the side wall of the bore hole thus allowing a minimum change in direction of the stream, maintaining more of the discharge stream velocity as it sweeps around the corner surface and across the hole bottom. Special consideration is given to cleaning the gage corner surface where the formation is difficult to cut and balling of the teeth is prevalent.
  • the gage row of cutting elements or teeth cut the side wall and diameter of the well bore, the outer periphery of the well bore bottom surface, and the corner surface between the side wall and bottom surfaces. The remaining rows of cutting elements cut the remaining bottom surface.
  • the outermost or gage row of cutting elements for each roller cutter is the row that most affects the rate of penetration of the rotary drill bit.
  • the formation is stronger at the annular corner of the bore hole formed at the juncture of the horizontal bottom surface and the vertically extending cylindrical side surface of the bore hole formation.
  • the outermost or gage row of cutting elements is the critical row in determining the rate of penetration. It is important that maximum cleaning action by the pressurized drilling fluid be provided particularly for the cutting elements in the outermost or gage row at the cutting engagement area of such cutting elements with the formation, and preferably at the cutting engagement area of other rows of cutting elements.
  • the nozzle discharge orifice is positioned at the outer circumference of the bit body close to the side wall of the formation and directed for the discharge of a stream of drilling fluid in a direction generally downwardly along the side wall and across the corner surface and hole bottom.
  • a nozzle orifice position accelerates and directs a high velocity drilling fluid downwardly alongside the side wall with a substantial portion of the stream contacting the side wall and a major portion of the stream directed toward the corner surface adjacent the side wall so that a majority of the fluid sweeps first across the corner surface and then across the bottom surface.
  • the high velocity fluid stream sweeps around the corner surface and along the hole bottom to scour the formation at the cutting engagement contact location of the cutting elements with the formation. While much of the prior art has provided some increase in penetration rates, it has been found that certain aspects of the nozzle position and direction of the fluid flow path therefrom are more important than expected.
  • Application serial no. 613,241 relates to a roller cutter drill bit in which a high velocity stream of drilling fluid is directed against the side wall and then sweeps around the corner surface at the cutting engagement contact location of the gage row of cutting elements with the formation.
  • the present invention likewise is directed to an improved hydraulic action for the cutting elements in the gage row.
  • the drilling fluid is discharged downwardly from a nozzle orifice at the outer circumference of the bit body closely adjacent the bore hole side wall with the drilling fluid stream sweeping across the corner surface of the bore hole and then inwardly across the hole bottom with a minimum change in direction of the stream.
  • the stream loses a minimum of energy as it sweeps around the corner surface and across the hole bottom.
  • a side portion of the high velocity stream or jet contacts the side wall above the corner surface so that a majority of the fluid scours the corner surface and sweeps across the bottom surface at the cutting engagement contact location of the cutters.
  • the stream of drilling fluid is directed in such a manner that the velocity of the drilling fluid sweeping across the corner surface and under the cutting elements is not substantially reduced after impacting the corner surface of the bore hole so that adequate velocity is retained for the subsequent sweeping action.
  • the high velocity stream after impacting the corner surface with at least a side portion thereof contacting the adjacent side wall sweeps with a thin high velocity sweeping action around the corner surface, and then beneath the cutter across the bottom hole surface to scour and clean the corner and bottom surfaces at the cutting engagement contact locations of the cutting elements.
  • the nozzle discharge orifices are positioned along the outer circumference of the drill bit body generally within one inch from the adjacent side wall of the bore hole.
  • the fluid discharge stream or jet from the nozzles is very close to the side wall when discharged from the nozzle orifice at least a side portion of the stream contacts the side wall as the discharge stream normally has a fan angle of between five (5) degrees and ten (10) degrees.
  • a substantial portion of the stream flows down the side wall above the corner surface for first sweeping along the adjacent side wall surface contacted by the adjacent reaming surface of the cutting elements in the reaming row, and then sweeping across the corner surface and the hole bottom.
  • a rotary drill bit 10 is shown in Figure 1 comprising a central main body or shank 12 with an upwardly extending threaded pin 14 and mounted for rotation about a vertical axis 15.
  • Threaded pin 14 comprises a tapered pin connection adapted for threadedly engaging the female end of a drill string (not shown) which is connected to a source of drilling fluid at a surface location.
  • Main body shank 12 is formed of three integral connected lugs defining three downwardly extending legs 16.
  • Each leg 16 has an inwardly and downwardly extending cylindrical bearing journal or shaft 18 at its lower end as shown in Figure 3.
  • Roller cutters 20A, 20B, and 20C are mounted on bearing shafts or journals 18 for rotation about longitudinal axes 21 and each roller cutter is formed of a generally conical shape as shown in Figure 3. Rotational axis 21 of cutter 20A as shown in Figure 3 intersects leg 16 at 23.
  • Each roller cutter 20A, 20B, and 20C comprises a generally conical body 22 having a recess therein receiving an associated bearing journal 18.
  • a plurality of generally elongate cutting elements or teeth 26 have cylindrical bodies mounted in sockets within body 22 and outer tips extending from the outer ends of cutting elements 26.
  • Cutting elements 26 may be made of a suitable powder metallurgy composite material having good abrasion and erosion resistant properties, such as sintered tungsten carbide in a suitable matrix. A hardness from about 85 Rockwell A to about 90 Rockwell A has been found to be satisfactory.
  • Cutting elements 26 are arranged on body 22 in concentric annular rows 28A, 28B, 28C, and 28D.
  • Row 28D is the outermost row and comprises the gage row of cutting elements 26 that determines the final diameter or gage of the formation bore hole which is generally indicated at 34.
  • Row 28C is adjacent to row 28D and comprises an interlocking row on cutter 20A.
  • Cutting elements 26 on row 28C are staggered circumferentially with respect to cutting elements 26 on row 28D and the cutting path of elements 26 on interlocking row 28C projects within the circular cutting path of row 28D.
  • the cutting paths of the cutting elements 26 on rows 28C and 28D of roller cutter 20A overlap.
  • cutters 20B and 20C do not have interlocking rows as adjacent rows 28B are spaced substantially inward of row 28D and cutting elements 26 on row 28B do not project within the cutting path of 28D for cutters 20B and 20C. In some instances, it may desirable to provide two cutters or possibly all of the cutters with interlocking rows of cutting elements.
  • the gage surface of roller cutter 20A includes a reaming surface 29 having a row 28E of generally cylindrical cutting elements 26A.
  • the gage surface of roller cutter 20A includes reaming surface 29, reaming cutting elements 26A in reaming row 28E, and cutting elements 26 in gage row 28D.
  • Bore hole 30 includes a generally horizontal bottom surface portion 32 and an adjacent cylindrical side wall 34 extending vertically generally at right angles to horizontal bottom 32.
  • the corner surface between horizontal bottom surface 32 and cylindrical side wall surface 34 is shown at 33 and has a 45° tangent through its center in Figure 6.
  • the cutting elements 26 on gage row 28D engage the formation in cutting relation generally at the corner surface 33 formed between the generally horizontal bottom surface 32 and the generally vertical side wall surface 34, as well as adjacent marginal portions of side wall 34 and bottom surface 32 as shown in Figure 6.
  • gage surface 29 and cylindrical cutting elements 26A frictionally engage side wall surface 34.
  • the gage row 28D of cutting elements 26 are positioned to contact and cut side wall 34 of bore hole 30, surface 33, and a marginal portion of the outer periphery of bottom surface 32 while the remaining inner rows 28A, 28B, and 28C are positioned to contact and cut the remainder of the bottom surface 32.
  • the rotational axes 21 of bearing shaft 18 may be offset from the rotational axis 15 of bit 10 as shown in Figure 2 an amount of 1/16 inch or less per inch of bit diameter as may be desired for the particular formation encountered.
  • gage row 28D engages the formation in cutting relation at the corner surface 33 between the cylindrical side wall surface 34 and bottom surface 32.
  • Several teeth 26 in gage row 28D may be in simultaneous cutting engagement with the periphery of bore hole 30 with a cutting elements 26 initially engaging side wall portion 34 on the leading side of cutter 20A at an upper point 31A and then disengaging bottom wall surface 32 as shown at lower point 31B in Figures 5 and 6.
  • Initial upper contact point 31A is generally around 1/2 to 1-1 /2 inches above the lowermost contact point 31B of cutting elements 26 and spaced circumferentially along the bore hole from point 31B around 2 inches, for example.
  • cutting elements 26 in gage row 28D proceed downwardly along side wall surface 34 from upper point 31A.
  • cutting elements or teeth 26 move downwardly along side wall surface 34, the formation is cut with a dragging, shearing action at the outer surfaces of teeth 26 in gage row 28D.
  • the amount of drag is reduced so that teeth 26 cut first the corner surface 33 and then cut a marginal portion of the bottom surface 32 of hole 30 with a partial scraping action and a partial crushing action.
  • corner surface 33 is generally located at the lowermost position of the cutting elements in gage row 28D and is shown at point 35 in Figures 5 and 6 at the center of corner surface 33. Also, reaming surface 29 and cutting elements 26A in reaming row 29 frictionally engage side wall 34. Soon after proceeding past the lowermost position shown by tooth 26, the teeth disengage corner surface 33 and disengage hole bottom surface 32 at lower point 31B. Due to this intricate path, there are typically two (2) to four (4) teeth in gage row 28D engaged simultaneously at different cutting areas along an arcuate cutting zone adjacent the lowermost tooth 26 including corner surface 33 and adjacent marginal portions of bottom surface 32 and side wall 34 between upper and lower points 31A and 31B.
  • the distance E between the cutting points from the initial side wall contact at upper point 31A to disengagement on the trailing side of the cutter adjacent lower point 31B as shown in Figure 6 varies with such factors as the offset of rotational axis 21, the type of formation, and other drilling conditions.
  • the cutting elements in inner rows 28A, 28B, and 28C engage only the hole bottom 32 with a relatively simple and comparatively short cutting path at cutting areas directly beneath the associated cutter.
  • the cutting action occurs primarily as a vertical motion into and out of the formation, with a slight amount of drag across the hole bottom.
  • Cutting engagement points for the cutting elements in gage row 28D and inner rows 28A and 28B are shown in Figure 2 at 39.
  • the cutting elements in their lowermost cutting position are shown as broken lines in Figure 2. It is in this position that the corner surface and inner areas of the bore hole are cut. This occurs directly below the center of rotation of the cutter.
  • These cutting engagement points are located in a generally L shaped pattern with the gage row cutting the side wall at the outer end of the pattern and the inner rows cutting the hole bottom at the inner end of the pattern.
  • the corner surface 33 is cut at the corner of the L shaped pattern as shown particularly in Figures 5 and 6. This pattern of cutting locations provides an opportunity for substantial increases in rate of penetration provided that a fluid nozzle design is provided to maximize fluid cleaning action between the formation and cutting elements at their engagement locations.
  • a directed nozzle fluid system is provided.
  • the fluid system includes a plurality of nozzles indicated at 36A, 36B, and 36C with a nozzle positioned on the outer circumference of bit body 12 closely adjacent an associated roller cutter 28A, 28B, and 28C.
  • Each nozzle 36 has a drilling fluid passage 38 thereto from the drill string which provides high velocity drilling fluid for discharge from a discharge orifice or port 37 through fluid passage 29A having its center at 41.
  • Nozzle 36A has a nozzle body 40 defining discharge orifice 37 for directing fluid stream therefrom as shown at 44 in a vertical direction parallel to the axis of bit rotation.
  • Fluid stream 44 is shown of a symmetrical cross section and having a fan angle of around 5 degrees to 20 degrees, for example, about the entire circumference of the stream with the centerline of the volume of discharged fluid shown at 45 and impacting corner surface 33 at impact point 47. Other fan angles or non-symmetrical cross sections for fluid stream 44 may be provided, if desired.
  • Nozzle 36A preferably is positioned with discharge orifice or port 37 at a position between the uppermost surface of roller cutter 20A as shown in Figure 3 and intersection point 23 of the rotational axis 21 of roller cutter 20A with leg 16.
  • Orifice 37 is at a height H as shown in Figure 3 above the center 35 of corner surface 33.
  • the drilling fluid has a maximum velocity and minimal cross sectional area.
  • the stream or jet travels from the exit point, the stream loses velocity and increases in cross section area.
  • a reduction in velocity reduces the cleaning effectiveness of the stream of drilling fluid.
  • a suitable height should provide an adequate size flow zone from the distribution of the stream with a sufficient velocity and dispersion to effectively clean the cutting elements and the formation.
  • discharge orifice 37 should be located as close as possible to side wall 34 with the center 41 of the discharge exit spaced a distance D as indicated in Figures 3 and 6 not greater than around 1 inch from side wall 34 and preferably around 1/2 inch.
  • D the fluid stream can be directed to undergo a minimum change in angular direction as its sweeps across the corner surface and the hole bottom.
  • a minimal change in direction of stream 44 is desirable to minimize viscous drag and to maintain maximum velocity.
  • a change in direction of fluid stream 44 may be as small as 90 degrees but should not exceed 100 degrees for best results.
  • Figure 7 illustrates a vertical plane P though the rotational axis 21 of roller cutter 20A and the center exit 41 of orifice 37 is offset a distance D1 from plane P.
  • the maximum radius of the body of roller cutter 20A not including the projecting portions of cutting elements 26 is indicated at R in Figure 7.
  • the center exit 41 of orifice 37 is located at a lateral distance D1 greater than the radius R from the axis of rotation so that a majority of the fluid stream may be directed against the corner surface 33 instead of the gage forming surface of roller cutter 20A.
  • orifice 37 should be spaced a height H from the center 35 of corner surface 33 not more than 2/3 the diameter of the bit. Thus, for an 8-3/4 inch diameter bit, height H should not be greater than around 6 inches. In any event, orifice 37 should not be positioned at a height below the intersection 23 of roller cutter 20A with leg 16. Fluid stream 44 flows downwardly with a substantial side portion of the stream contacting side wall 34.
  • Nozzle 36A and orifice 37 are also positioned for directing more hydraulic energy against the cutting elements 26 in gage row 28D than against the cutting elements 26 in any other row including interlocking row 28C.
  • the corner cutting location shown at 35 in Figure 6 is the center of corner surface 33 directly beneath the rotational axis 21 of cutter 20A which is the maximum projection of gage row 28D on the hole bottom. After impacting side wall 34 at 47, stream 44 sweeps along corner surface 33, then across the hole bottom surface 32 at a high velocity generally tangential to the surface of the formation.
  • a side portion of stream 44 contacts the side wall 34 before the cutting elements 26 in row 28D engage the formation at upper point 31A in cutting relation and before impact of the stream 44 against corner surface 33 at point 47. Additionally, as shown in Figures 3 and 6 a substantial portion of stream 44 contacts reaming surface 29 and cutting elements 28E in reaming row 28E for cleaning the gage surface thereat. After impacting side wall 34 at 47, stream 44 is directed by side wall 34 behind cutting elements 26 in gage row 28D and cutting elements 28E in reaming row 28E, then along corner surface 33, and inwardly across bottom surface 32 tangential to the formation.
  • stream 44 closely follows the contour of corner surface 33 and bottom surface 32 in a thin high velocity stream thereby providing a relatively thin high velocity stream sweeping between the formation and cutting elements at numerous cutting engagement locations of rows 28D, 28C, 28B, and 28A for maximum cleaning effectiveness.
  • the nozzle orifices 37 are made of tungsten carbide or other suitable erosion resistant material and are positioned a distance H as shown in Figure 3 above impact point 47 on corner surface 33. Orifice 37 is preferably positioned between the upper surface of cutter 20A and intersection 23 of rotational axis 21 with leg 16 but may, under certain conditions, be located below intersection 23 or above the upper surface of nozzle 20A.
  • Nozzles 36A, 36B, 36C are each positioned closely adjacent respective roller cutters 20A, 20B and 20C. Nozzle 36A, for example, is positioned close to the leading side of roller cutter 20A with respect to the direction of bit rotation. Roller cutters 20A, 20B, and 20C are spaced in a circular path at intervals of 120 degrees.
  • bit body 12H includes a roller cutter 20H having a gage row 28H of cutting elements and a reaming row 28I of cylindrical cutting elements.
  • a stream 44H of drilling fluid is provided from passage 29H and fluid discharge tube 46H.
  • the centerline 45H of the stream 44H of drilling fluid from nozzle 36H at the end of the tube 46H is slightly slanted toward the side wall 34H preferably at a radial angle less than around 10 degrees with the impact point 47H being above corner surface 33H.
  • Nozzle 36H has an orifice 37H which discharges a stream of fluid with the centerline 45H impacting side wall 34H above the center 35H of corner surface 33H a distance H1 of around 1 inch for example, as shown in Figure 8.
  • the center 41H of orifice 37H is spaced a distance D2 from side wall 34H which is less than around one inch.
  • Flow passage 29H directs fluid stream 44H at an angular relation to side wall 34H for impacting side wall 34H at 47H.
  • Fluid stream 44H is flattened by side wall 34H and flows downwardly along the surface of side wall 34H, across corner surface 33H at the cutting and gage contacting areas of the gage row and reaming row.
  • the fluid stream 44H is disposed along the side wall in a wider stream for sweeping across corner surface 33H at the cutting and gage engaging areas of the gage row and reaming row.
  • a bit body 12R has a roller cutter 20R positioned adjacent side wall 34R and corner surface 33R.
  • Roller cutter 20R has a gage row 28R of cutting elements and a reaming row 28S of cutting elements similar to roller cutter 20A of the embodiment of Figures 1-7.
  • a fluid discharge tube 46R leads from fluid passage 29R in bit body 12R.
  • a discharge nozzle 36R has a discharge orifice 37R for fluid stream 44R having a centerline 45R for the center of the volume of discharged fluid.
  • Discharge nozzle 36R is positioned at the outer circumference of bit body 12R with discharge orifice 37R being positioned a distance less than one inch from side wall 34R as in the embodiments of Figures 1-7 and Figures 8 and 9.
  • the longitudinal axis of discharge tube 46R is angled toward the center of roller cutter 20R at the lowermost projection point of the cutting elements in gage row 28R with the formation at corner surface 33R.
  • the center 45R of stream 44R impacts side wall 34R at impact point 47R generally above the maximum vertical projection of the cutting elements in gage row 28R indicated at 39R.
  • stream 44R sweeps across corner surface 33R at the area of maximum cutting engagement by the gage row 28R of cutting elements and also across the reaming row 28S of cutting elements.
  • an improved rate of penetration may be obtained by the improved cleaning and hydraulic action provided by the positioning of fluid discharge orifices along the outer circumference of a drill bit body spaced less than around one inch from the bore hole side wall for the discharge of a high velocity stream of drilling fluid having at least a substantial side portion thereof contacting and flowing along the side wall surface in opposed relation to an associated roller cutter for sweeping across the corner surface at the cutting engagement area of the cutting elements in the gage row and the gage forming area of the reaming row with the formation.
  • the high velocity stream in one embodiment has the center of the fluid volume impacting the corner surface while other embodiments have the center of the stream impacting the side wall surface above the corner surface.
  • the stream undergoes a minimum change in direction as it sweeps across the corner surface and along the hole bottom while maintaining a maximum velocity.
  • the stream is provided direct access to the cutting elements behind the roller cutter of the reaming and gage rows at the cutting engagement area of the gage row and the gage forming engagement area of the reaming row during contact with the formation.
  • the nozzle orifice may under certain conditions be positioned a substantial distance from the body of the adjacent roller cutter and yet function in a satisfactory manner for the discharge of the high velocity stream depending on various factors, for example, as the height of the orifice above the bore hole bottom and the slanting of the stream toward the roller cutter such as shown in Figure 10.

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Earth Drilling (AREA)
EP19910301389 1990-03-30 1991-02-21 Outwardly mounted nozzles for rotary drill bits Withdrawn EP0449415A3 (en)

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
US502046 1990-03-30
US07/502,046 US5029656A (en) 1989-07-17 1990-03-30 Nozzle means for rotary drill bits
US07/613,241 US5096005A (en) 1990-03-30 1990-11-14 Hydraulic action for rotary drill bits
US613241 1990-11-14
US63294990A 1990-12-24 1990-12-24
US632949 1996-04-16

Publications (2)

Publication Number Publication Date
EP0449415A2 true EP0449415A2 (de) 1991-10-02
EP0449415A3 EP0449415A3 (en) 1991-11-27

Family

ID=27414191

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19910301389 Withdrawn EP0449415A3 (en) 1990-03-30 1991-02-21 Outwardly mounted nozzles for rotary drill bits

Country Status (1)

Country Link
EP (1) EP0449415A3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315509A (en) * 1996-07-19 1998-02-04 Baker Hughes Inc Biased nozzle arrangement for rolling cone rock bits

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3618682A (en) * 1969-10-24 1971-11-09 Sun Oil Co Method and apparatus for drilling

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3618682A (en) * 1969-10-24 1971-11-09 Sun Oil Co Method and apparatus for drilling

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2315509A (en) * 1996-07-19 1998-02-04 Baker Hughes Inc Biased nozzle arrangement for rolling cone rock bits
GB2315509B (en) * 1996-07-19 2000-11-01 Baker Hughes Inc Biased nozzle arrangement for rolling cone rock bits
US6142247A (en) * 1996-07-19 2000-11-07 Baker Hughes Incorporated Biased nozzle arrangement for rolling cone rock bits

Also Published As

Publication number Publication date
EP0449415A3 (en) 1991-11-27

Similar Documents

Publication Publication Date Title
EP0449416B1 (de) Drehbohrmeissel mit nach aussen gerichteten Düsen
US4848476A (en) Drill bit having offset roller cutters and improved nozzles
EP0409387B1 (de) Bohrvorrichtung mit verbesserter hydraulischer Wirkung zur Führung der Bohrflüssigkeit
US4611673A (en) Drill bit having offset roller cutters and improved nozzles
US6450270B1 (en) Rotary cone bit for cutting removal
US7013999B2 (en) Wedge tooth cutter element for drill bit
US3548959A (en) Relief-type jet bits
EP0723066A2 (de) Bohrmeissel mit verbesserter Schneidstruktur
US4741406A (en) Drill bit having offset roller cutters and improved nozzles
US20080164069A1 (en) Drill Bit and Cutter Element Having Chisel Crest With Protruding Pilot Portion
EP1616071B1 (de) Bohrmeissel
US5819861A (en) Earth-boring bit with improved cutting structure
GB2227509A (en) A combination drill bit
WO1996018020A1 (en) Rotary cone drill bit with angled ramps
US6098728A (en) Rock bit nozzle arrangement
US20080156542A1 (en) Rock Bit and Inserts With Wear Relief Grooves
GB2412676A (en) Optimising fluid flow characteristics for a roller cone drill bit
US6354387B1 (en) Nozzle orientation for roller cone rock bit
US5676214A (en) Flow channels for tooth type rolling cutter drill bits
US8020639B2 (en) Cutting removal system for PDC drill bits
US6209668B1 (en) Earth-boring bit with improved cutting structure
EP0449415A2 (de) Nach aussen gerichtete Düsen für Drehbohrmeissel
CA2859386C (en) Drill bit with enhanced hydraulics and erosion-shielded cutting teeth
CA2048396A1 (en) Outwardly mounted nozzles for rotary drill bits
CA2022495C (en) Nozzle means for rotary drill bits

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Kind code of ref document: A2

Designated state(s): DE FR GB IT NL

PUAL Search report despatched

Free format text: ORIGINAL CODE: 0009013

AK Designated contracting states

Kind code of ref document: A3

Designated state(s): DE FR GB IT NL

17P Request for examination filed

Effective date: 19920429

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN WITHDRAWN

18W Application withdrawn

Withdrawal date: 19920717