CA1233168A - Hybrid rock bit - Google Patents
Hybrid rock bitInfo
- Publication number
- CA1233168A CA1233168A CA000468104A CA468104A CA1233168A CA 1233168 A CA1233168 A CA 1233168A CA 000468104 A CA000468104 A CA 000468104A CA 468104 A CA468104 A CA 468104A CA 1233168 A CA1233168 A CA 1233168A
- Authority
- CA
- Canada
- Prior art keywords
- bit
- cutting
- leg
- cutter cone
- rock 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.)
- Expired
Links
- 239000011435 rock Substances 0.000 title claims abstract description 34
- 238000005520 cutting process Methods 0.000 claims abstract description 40
- 239000010432 diamond Substances 0.000 claims abstract description 36
- 229910003460 diamond Inorganic materials 0.000 claims abstract description 29
- 238000005096 rolling process Methods 0.000 description 13
- 206010017076 Fracture Diseases 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 5
- 238000005755 formation reaction Methods 0.000 description 5
- 208000010392 Bone Fractures Diseases 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000005553 drilling Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- UONOETXJSWQNOL-UHFFFAOYSA-N tungsten carbide Chemical compound [W+]#[C-] UONOETXJSWQNOL-UHFFFAOYSA-N 0.000 description 2
- 229910000760 Hardened steel Inorganic materials 0.000 description 1
- 241000412626 Penetes Species 0.000 description 1
- 208000013201 Stress fracture Diseases 0.000 description 1
- 230000003466 anti-cipated effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 239000002173 cutting fluid Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 238000009966 trimming Methods 0.000 description 1
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
- E21B10/14—Roller bits combined with non-rolling cutters other than of leading-portion type
-
- 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
- E21B10/12—Roller bits with discs cutters
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)
Abstract
HYBRID ROCK BIT
ABSTRACT
A hybrid rock bit is disclosed which includes at least one cutter cone leg which supports at least one disk cutter cone. Each disk cutter cone includes a plurality of spaced apart cutting disk edges which extend continuously around the periphery of the cone. At least one drag bit leg is utilized, with the drag bit leg including a plurality of diamond cutting elements in one face thereof. The diamond cutting elements are arranged to contact the borehole bottom during bit operation. Continuous disk cutters are utilized on the cutter cone to minimize "bouncing" or vertical movement of the rock bit which can damage or fracture the diamond cutting elements.
ABSTRACT
A hybrid rock bit is disclosed which includes at least one cutter cone leg which supports at least one disk cutter cone. Each disk cutter cone includes a plurality of spaced apart cutting disk edges which extend continuously around the periphery of the cone. At least one drag bit leg is utilized, with the drag bit leg including a plurality of diamond cutting elements in one face thereof. The diamond cutting elements are arranged to contact the borehole bottom during bit operation. Continuous disk cutters are utilized on the cutter cone to minimize "bouncing" or vertical movement of the rock bit which can damage or fracture the diamond cutting elements.
Description
~33~
BACKGROUND OF THE INVENTION
Rotary drill bits for rock drilling are well krlown in the prior art. A common type of rotary drill bit utilizes a plurality of rollin~ cone cutters which are mounted to the drill bit body in a manner which will allow the cutters to roll along the bottom of a wellbore when the drill bit body is rotated. Such rolling cone cutters can be formed utilizing an;
integrated body of hardened steel with teeth or cutters ~ormed about the exterior surface thereof. Another type of rolling cone cutter utilizes a steel body with a plurality of tungsten carbide or similar hardened inserts that protrude from the surface of the body in the manner of small knobs.
Again, as the rolling cone cutters roll on the bottom of the wellbore, the teeth or inserts apply a highly compressive load to the bottom of the wellbore and fracture that bottom. The cutting action for such cutters is typically a combination of crushing action and chipping action.
Another well known type of rotary rock bit is the so-called drag bit. Generally, drag bits include a set diamond cutter which includes a face which is embedded or "set'~ with numerous cutting diamonds. These i' cutting diamonds protrude from the surface of the bit a short distance and jj when the drill i~ rotated into the formation they cut the formation utilizing 20 ll a combination of compression and shearing action. The depth of , i penet~ation utilizing a diamond drag bit is limited by the weight on the ¦~ bit, the number of diamonds utilized and the heat dissipating limitations of the bit.
Hybrid rock bits which utilize combinations of drag bits and
BACKGROUND OF THE INVENTION
Rotary drill bits for rock drilling are well krlown in the prior art. A common type of rotary drill bit utilizes a plurality of rollin~ cone cutters which are mounted to the drill bit body in a manner which will allow the cutters to roll along the bottom of a wellbore when the drill bit body is rotated. Such rolling cone cutters can be formed utilizing an;
integrated body of hardened steel with teeth or cutters ~ormed about the exterior surface thereof. Another type of rolling cone cutter utilizes a steel body with a plurality of tungsten carbide or similar hardened inserts that protrude from the surface of the body in the manner of small knobs.
Again, as the rolling cone cutters roll on the bottom of the wellbore, the teeth or inserts apply a highly compressive load to the bottom of the wellbore and fracture that bottom. The cutting action for such cutters is typically a combination of crushing action and chipping action.
Another well known type of rotary rock bit is the so-called drag bit. Generally, drag bits include a set diamond cutter which includes a face which is embedded or "set'~ with numerous cutting diamonds. These i' cutting diamonds protrude from the surface of the bit a short distance and jj when the drill i~ rotated into the formation they cut the formation utilizing 20 ll a combination of compression and shearing action. The depth of , i penet~ation utilizing a diamond drag bit is limited by the weight on the ¦~ bit, the number of diamonds utilized and the heat dissipating limitations of the bit.
Hybrid rock bits which utilize combinations of drag bits and
2 5 rolling cone cutters have been proposed in the prior art . One such i!
example is t1nited States Patent No. 3,174,564, issued to E~.~. Morlan.
The Morlan bit includes a cylindrical crown encrusted with ~;et diamonds ~or cutting an annulus around a core. The set diamonds in the Morlan "
~33~8 disclosure protrudte from the matrix a small ~istance in a conventional manner. A plurality of rolling cone cutters with carbide inserts are mounted in special recesses around the cylindrical crown for cutting an outer annulus of a considerably greater area than the inner annulus cut by the diamonds. The set diamonds are used for their fine abrasive action in trimming the core and thereby minimizing breakage~ Most of the cutting utilizing this bit is accomplished utilizing the rolling cone cutters.
United States Patent No. 1,731,262, issued to Phipps and United States Patent No. 2 ,054 ,277, issued to Wright also disclose combinations of drag bits and rolling cone cutters; however, the drag bits utilized in both Phipps arld W~ight are steel drag teeth and are therefore, limited in application to soft formations which can be cut efficiently with such a , design. These steel drag teeth are impractical for deep wells wherein formations of various hardness are encountered.
Another example of a hybrid rock bit is disclosed in United States Patent No . 4, 285, 409 issued to James H . Allen . The Alien hybrid rock bit includes two rolling cone cutters and a single extended drag bit.
, The Allen hybrid bit utilizes the single drag bit with appropriately placed diamond cutter elements to remove the ~igh points or ridges remaining in ; the ~ormation on the bottom of the wellbore which are typically created by the action of rolling cone cutters. This is necessary due to the tendency i; , .
, of rolling te~th on each cone cutter to "track" in the bottom of the, ' borehole and thus create ridges between the cutting area of each group of ; teeth, 2 5 Various other modiflcations of a hybrid rock bit design which combines a diamond drag bit with a rolling cone cutter are disclosed in tlnited States Patent No, 4 ,006 ,788 l issued to Lloyd I.. Carner; United States Yaterlt No. 3,343,371, issued to William Buker III et al; and United _3_
example is t1nited States Patent No. 3,174,564, issued to E~.~. Morlan.
The Morlan bit includes a cylindrical crown encrusted with ~;et diamonds ~or cutting an annulus around a core. The set diamonds in the Morlan "
~33~8 disclosure protrudte from the matrix a small ~istance in a conventional manner. A plurality of rolling cone cutters with carbide inserts are mounted in special recesses around the cylindrical crown for cutting an outer annulus of a considerably greater area than the inner annulus cut by the diamonds. The set diamonds are used for their fine abrasive action in trimming the core and thereby minimizing breakage~ Most of the cutting utilizing this bit is accomplished utilizing the rolling cone cutters.
United States Patent No. 1,731,262, issued to Phipps and United States Patent No. 2 ,054 ,277, issued to Wright also disclose combinations of drag bits and rolling cone cutters; however, the drag bits utilized in both Phipps arld W~ight are steel drag teeth and are therefore, limited in application to soft formations which can be cut efficiently with such a , design. These steel drag teeth are impractical for deep wells wherein formations of various hardness are encountered.
Another example of a hybrid rock bit is disclosed in United States Patent No . 4, 285, 409 issued to James H . Allen . The Alien hybrid rock bit includes two rolling cone cutters and a single extended drag bit.
, The Allen hybrid bit utilizes the single drag bit with appropriately placed diamond cutter elements to remove the ~igh points or ridges remaining in ; the ~ormation on the bottom of the wellbore which are typically created by the action of rolling cone cutters. This is necessary due to the tendency i; , .
, of rolling te~th on each cone cutter to "track" in the bottom of the, ' borehole and thus create ridges between the cutting area of each group of ; teeth, 2 5 Various other modiflcations of a hybrid rock bit design which combines a diamond drag bit with a rolling cone cutter are disclosed in tlnited States Patent No, 4 ,006 ,788 l issued to Lloyd I.. Carner; United States Yaterlt No. 3,343,371, issued to William Buker III et al; and United _3_
3~
States Patent No. 4,359,112, issued to Lloyd L. Garner et al. Each of the aforementioned patents discloses a hybrid rock bit which includes a combination drag bit and rolling cone cutter.
Each of the aforementioned known hybrid rock bits which;
includes diamond drag bit cutters is particularly sensitive to overloading and sudden vertical movement of the drill bit which can sha~ter or fracture the diamond cutters. While diamond cutting tools are extremely hard and can handle abrasive wear for long periods of time, they are also exceedingly susceptible to fracture or breakage when subjected to these 10 ~ sudden impacts.
S UMMARY OF THE INVENTION
It is therefore one object o E the present invention to provide an improved hybrid rock bit.
It is another object of the present invention to provide an improved hybrid rock bit which includes both rolling cone cutters and drag bit cutters.
It is yet another object of the present invention to provide an improved hybrid rock bit including a drag bit cutter which minimizes 2 o rertical movement of the bit during operation whereby stress fracture of the drag bit cutters is minimized.
It is another object of the present invention to provide ~n improved hybrid rock bit including a drag bit cutter which can be utilized in formations of varying hardness.
2 5 The -foregoing objects are achieved as is now described. The hybrid rock bit of the present invention includes at least one cutter cone leg which supports nt least one disk cutter cone. Each disk cutter cone includes a plurality of spalced apart cut-tin~ disk edges which extend ~3~
continuously around the periphery of the cone. At least one drag bit leg is utilized, with the drag bit leg including a plurality of diamond cutting elements in one face thereof. The diamond cutting elements are arran~ed to contact the borehole bottom du~ng bit operation. Continuous disk cutters are utilized on the cutter cone to minimize "bouncing," or vertical;
movement o the rock bit which can damage or fracture the diamond cutting elements.
.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed characteristic of the invention are , set forth in the appended claims. The invention itself; however, as well as a preferred mode of use, further objects and advantages thereof, will best be understood by rePerence to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
Figure 1 is a perspective view of the hybrid rock bit OI the present invention; and ,! Eigure 2 is an end view of the hybrid rock bit of F~gure 1.
!;
DETAILED DESCRIPTION OF THE INVENTION
With reference now to the figures and in particular with reference to Fi~ure 1, there is depicted a preferred embodiment of a hyb~id rock bit generally designated at reference numeral 10, which includes a bit body 12 ha~ring a pin end 14 and a cutting end 16. A pair 2 5 of opposed roller cone legs 18 are utilized to support cutter cones 20 and 22. Disposed adjacent to cutter cones 2û and 22 in the depîcted embodiment, nnd diametrically opposed from each other are drag bit legs 24 and 26 which extend from blt body 12 and which serve to support diamond i'. ' 'i ~:33~8 il insert cutter blanks 28, Preferably a plurality of diamond insert cutting blanks 28 are utili~;ed and they are positioned in the face of drag bit legs 24 and 26 in a manne~ which will be explained in detail herein. As those skilled in the art will appreciate, hybrid rock bit 10 also preferably includes hydraulic nozzles or openings which communicate with a central chamber within bit body 12 and which provide a channel for cutting fluid or drilling mud to be applied to the bottom of the wellbore, cooling the cutting implements and removing cuttings from the ~Nellbore.
Diamond insert cutter blanks 28 are preferably fabricated from a tungsten carbide substrate with a diamond layer sintered to a face of the substrate, the diamond layer being composed of a polycrystalline material.
One such synthetic polycrystalline diamond material is manufactured by the Specialty Material Department of General Electric Company of Worthington, Ohio under the trademark narne of Stratapax.
As can- b~ seen in Figure 1, cutter cones 20 and 22 do not }nclude a plurality of teeth or carbide inserts in the manner of most well known cutter cones. Cutter cones 20 and 22 each include a plurality of spaced apart disk edges 30 which extend continuously around the periphery thereof and which are utilized to at least partially support the weight of the drill bit and drill pipe above the bit and to shear and grind rock from the bottom of the wellbore~ In one embodiment of novel hybrid i, rock bit 10 of the present invention, cutter cones 20 and 22 may be deliberately skewed to enhance the shearing action of cutting disk edges 30. The utilization of a continuous disk edge, as opposed to a plurality of tooth inserts has been found to enhance the usable lifetime of hybrid rocX
bit 10 by minimizing the bouncing or vertical movement associated with the operation of Icnown roller cutter cones, which may subject diamond insert cutter blanks 28 to vertical stress and subsequent fractures. When the !
.. B4685 ~33~
vertical movement is minimized or substantially eliminated by the utilization of continuous disk cutting edges the probability of fractures or cracking of diamond insert cutter blanks 28 is effectively minimized, unexpectedly increasing the efficiency of the operation of hybrid rock bit 10.
Referring now to Figure 2, there is depicted an end view of hybrid rock bit 10 which will serve to illustrate the preferred placement of diamond insert cutter blanks 28. Those skilled in the art will appreciate that the continuous cutting disk edges 30 disposed about the periphery of cutter cones 20 and 22, in an embodiment without a substantial amount of skew, will result in a plurality of concentric paths being cut into the borehole bot~om. Careful placement of diamond insert cutter blanks 28, at the points geometrically between spaced apart continuous cutting disk edges 30 of cutter cones 20 and 22 will result in the application of diamond insert cutter blanks 28 to the ridges ~ormed by the action of the cutting disk edges 30 of cutter cones 20 and 22. Thus, diamond insert cutter 15 ; blanks 28 can be utilized to remove these ridges and assure removal ofdetritus material from the borehole and the maximum efficient progress of ; rock bit 10 in the hole. In an alternate embodiment of the present invention drag bit legs 24 and 26 may be altered to permit diamon~ insert cutter blanks 28 to be mounted at a point even with the extension of disk 2 O edges 30, or below or above disk edges 30 to vary the penetration parameters of hybrid rock bit 1û in correlation with the hardness of the ~ormation being drilled. Additionally, it is anticipated that drag bit legs 24 and 26 may be movab}y mounted to bit body 12 to permit the extension of diamond insert cutter blanks 28 to be altered in situ utilizing hydraulic or pneumatic controls. ~
Although the invention has been described with reference to a specific embodiment, thi~ descI~ption is not meant to be con~trued in n -r-.; B4685 ~3;~68 l;miting sense. ~arious modifications of the disclosed embodiment as well as alternative embodiments of the invention will become apparent to persons skilled in the art upon reference to the description oP the invention. It is therefore contemplated that the appended claims will cover any such modifications or embodiments that fall within the true scope of the invention .
i,'
States Patent No. 4,359,112, issued to Lloyd L. Garner et al. Each of the aforementioned patents discloses a hybrid rock bit which includes a combination drag bit and rolling cone cutter.
Each of the aforementioned known hybrid rock bits which;
includes diamond drag bit cutters is particularly sensitive to overloading and sudden vertical movement of the drill bit which can sha~ter or fracture the diamond cutters. While diamond cutting tools are extremely hard and can handle abrasive wear for long periods of time, they are also exceedingly susceptible to fracture or breakage when subjected to these 10 ~ sudden impacts.
S UMMARY OF THE INVENTION
It is therefore one object o E the present invention to provide an improved hybrid rock bit.
It is another object of the present invention to provide an improved hybrid rock bit which includes both rolling cone cutters and drag bit cutters.
It is yet another object of the present invention to provide an improved hybrid rock bit including a drag bit cutter which minimizes 2 o rertical movement of the bit during operation whereby stress fracture of the drag bit cutters is minimized.
It is another object of the present invention to provide ~n improved hybrid rock bit including a drag bit cutter which can be utilized in formations of varying hardness.
2 5 The -foregoing objects are achieved as is now described. The hybrid rock bit of the present invention includes at least one cutter cone leg which supports nt least one disk cutter cone. Each disk cutter cone includes a plurality of spalced apart cut-tin~ disk edges which extend ~3~
continuously around the periphery of the cone. At least one drag bit leg is utilized, with the drag bit leg including a plurality of diamond cutting elements in one face thereof. The diamond cutting elements are arran~ed to contact the borehole bottom du~ng bit operation. Continuous disk cutters are utilized on the cutter cone to minimize "bouncing," or vertical;
movement o the rock bit which can damage or fracture the diamond cutting elements.
.
BRIEF DESCRIPTION OF THE DRAWINGS
The novel features believed characteristic of the invention are , set forth in the appended claims. The invention itself; however, as well as a preferred mode of use, further objects and advantages thereof, will best be understood by rePerence to the following detailed description of an illustrative embodiment when read in conjunction with the accompanying drawings, wherein:
Figure 1 is a perspective view of the hybrid rock bit OI the present invention; and ,! Eigure 2 is an end view of the hybrid rock bit of F~gure 1.
!;
DETAILED DESCRIPTION OF THE INVENTION
With reference now to the figures and in particular with reference to Fi~ure 1, there is depicted a preferred embodiment of a hyb~id rock bit generally designated at reference numeral 10, which includes a bit body 12 ha~ring a pin end 14 and a cutting end 16. A pair 2 5 of opposed roller cone legs 18 are utilized to support cutter cones 20 and 22. Disposed adjacent to cutter cones 2û and 22 in the depîcted embodiment, nnd diametrically opposed from each other are drag bit legs 24 and 26 which extend from blt body 12 and which serve to support diamond i'. ' 'i ~:33~8 il insert cutter blanks 28, Preferably a plurality of diamond insert cutting blanks 28 are utili~;ed and they are positioned in the face of drag bit legs 24 and 26 in a manne~ which will be explained in detail herein. As those skilled in the art will appreciate, hybrid rock bit 10 also preferably includes hydraulic nozzles or openings which communicate with a central chamber within bit body 12 and which provide a channel for cutting fluid or drilling mud to be applied to the bottom of the wellbore, cooling the cutting implements and removing cuttings from the ~Nellbore.
Diamond insert cutter blanks 28 are preferably fabricated from a tungsten carbide substrate with a diamond layer sintered to a face of the substrate, the diamond layer being composed of a polycrystalline material.
One such synthetic polycrystalline diamond material is manufactured by the Specialty Material Department of General Electric Company of Worthington, Ohio under the trademark narne of Stratapax.
As can- b~ seen in Figure 1, cutter cones 20 and 22 do not }nclude a plurality of teeth or carbide inserts in the manner of most well known cutter cones. Cutter cones 20 and 22 each include a plurality of spaced apart disk edges 30 which extend continuously around the periphery thereof and which are utilized to at least partially support the weight of the drill bit and drill pipe above the bit and to shear and grind rock from the bottom of the wellbore~ In one embodiment of novel hybrid i, rock bit 10 of the present invention, cutter cones 20 and 22 may be deliberately skewed to enhance the shearing action of cutting disk edges 30. The utilization of a continuous disk edge, as opposed to a plurality of tooth inserts has been found to enhance the usable lifetime of hybrid rocX
bit 10 by minimizing the bouncing or vertical movement associated with the operation of Icnown roller cutter cones, which may subject diamond insert cutter blanks 28 to vertical stress and subsequent fractures. When the !
.. B4685 ~33~
vertical movement is minimized or substantially eliminated by the utilization of continuous disk cutting edges the probability of fractures or cracking of diamond insert cutter blanks 28 is effectively minimized, unexpectedly increasing the efficiency of the operation of hybrid rock bit 10.
Referring now to Figure 2, there is depicted an end view of hybrid rock bit 10 which will serve to illustrate the preferred placement of diamond insert cutter blanks 28. Those skilled in the art will appreciate that the continuous cutting disk edges 30 disposed about the periphery of cutter cones 20 and 22, in an embodiment without a substantial amount of skew, will result in a plurality of concentric paths being cut into the borehole bot~om. Careful placement of diamond insert cutter blanks 28, at the points geometrically between spaced apart continuous cutting disk edges 30 of cutter cones 20 and 22 will result in the application of diamond insert cutter blanks 28 to the ridges ~ormed by the action of the cutting disk edges 30 of cutter cones 20 and 22. Thus, diamond insert cutter 15 ; blanks 28 can be utilized to remove these ridges and assure removal ofdetritus material from the borehole and the maximum efficient progress of ; rock bit 10 in the hole. In an alternate embodiment of the present invention drag bit legs 24 and 26 may be altered to permit diamon~ insert cutter blanks 28 to be mounted at a point even with the extension of disk 2 O edges 30, or below or above disk edges 30 to vary the penetration parameters of hybrid rock bit 1û in correlation with the hardness of the ~ormation being drilled. Additionally, it is anticipated that drag bit legs 24 and 26 may be movab}y mounted to bit body 12 to permit the extension of diamond insert cutter blanks 28 to be altered in situ utilizing hydraulic or pneumatic controls. ~
Although the invention has been described with reference to a specific embodiment, thi~ descI~ption is not meant to be con~trued in n -r-.; B4685 ~3;~68 l;miting sense. ~arious modifications of the disclosed embodiment as well as alternative embodiments of the invention will become apparent to persons skilled in the art upon reference to the description oP the invention. It is therefore contemplated that the appended claims will cover any such modifications or embodiments that fall within the true scope of the invention .
i,'
Claims (4)
1. A hybrid rock bit comprising:
a rock bit body having a pin end at a first end thereof and a cutting end at a second end thereof, said cutting end comprising:
at least one drag bit leg extending from said cutting end and having a plurality of diamond cutting elements positioned in a face thereof and arranged to contact a borehole bottom in a plurality of substantially concentric circles;
at least one cutter cone leg coextending with said at least one drag bit leg;
a journal extending from said at least one cutter cone leg; and a disk cutter cone mounted on said journal having a plurality of spaced apart cutting disk edges extending continuously around the periphery thereof wherein both vertical movement of said rock bit body during operation thereof and damage to said plurality of diamond cutting elements is minimized.
a rock bit body having a pin end at a first end thereof and a cutting end at a second end thereof, said cutting end comprising:
at least one drag bit leg extending from said cutting end and having a plurality of diamond cutting elements positioned in a face thereof and arranged to contact a borehole bottom in a plurality of substantially concentric circles;
at least one cutter cone leg coextending with said at least one drag bit leg;
a journal extending from said at least one cutter cone leg; and a disk cutter cone mounted on said journal having a plurality of spaced apart cutting disk edges extending continuously around the periphery thereof wherein both vertical movement of said rock bit body during operation thereof and damage to said plurality of diamond cutting elements is minimized.
2. The hybrid rock bit according to Claim 1 wherein said cutting end includes two drag bit legs and two cutter cone legs arranged in alternate fashion.
3. A hybrid rock bit comprising:
a rock bit body having a pin end at a first end thereof and a cutting end at a second end thereof, said cutting end comprising:
at least one cutter cone leg extending from said cutting end;
a journal extending from said at least one cutter cone leg;
a disk cutter cone mounted on said journal having a plurality of spaced apart cutting disk edges extending continuously around the periphery thereof; and at least one drag bit leg coextending with said at least one cutter cone leg from said cutting end, said at least one drag bit leg having a plurality of diamond cutting elements positioned in a face thereof and being arranged to contact a borehole bottom at a plurality of concentric ridges resultant from the removal of cuttings by said plurality of spaced apart cutting disk edges.
a rock bit body having a pin end at a first end thereof and a cutting end at a second end thereof, said cutting end comprising:
at least one cutter cone leg extending from said cutting end;
a journal extending from said at least one cutter cone leg;
a disk cutter cone mounted on said journal having a plurality of spaced apart cutting disk edges extending continuously around the periphery thereof; and at least one drag bit leg coextending with said at least one cutter cone leg from said cutting end, said at least one drag bit leg having a plurality of diamond cutting elements positioned in a face thereof and being arranged to contact a borehole bottom at a plurality of concentric ridges resultant from the removal of cuttings by said plurality of spaced apart cutting disk edges.
4. The hybrid rock bit according to Claim 3 wherein said cutting end includes two drag bit legs and two cutter cone legs arranged in alternate fashion.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US55329883A | 1983-11-18 | 1983-11-18 | |
| US553,298 | 1983-11-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1233168A true CA1233168A (en) | 1988-02-23 |
Family
ID=24208893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000468104A Expired CA1233168A (en) | 1983-11-18 | 1984-11-16 | Hybrid rock bit |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0162107A1 (en) |
| AU (1) | AU3740985A (en) |
| CA (1) | CA1233168A (en) |
| WO (1) | WO1985002223A1 (en) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2203774A (en) * | 1987-04-21 | 1988-10-26 | Cledisc Int Bv | Rotary drilling device |
| US7845435B2 (en) * | 2007-04-05 | 2010-12-07 | Baker Hughes Incorporated | Hybrid drill bit and method of drilling |
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| US7819208B2 (en) | 2008-07-25 | 2010-10-26 | Baker Hughes Incorporated | Dynamically stable hybrid drill bit |
| US8450637B2 (en) | 2008-10-23 | 2013-05-28 | Baker Hughes Incorporated | Apparatus for automated application of hardfacing material to drill bits |
| US8948917B2 (en) | 2008-10-29 | 2015-02-03 | Baker Hughes Incorporated | Systems and methods for robotic welding of drill bits |
| US9439277B2 (en) | 2008-10-23 | 2016-09-06 | Baker Hughes Incorporated | Robotically applied hardfacing with pre-heat |
| US8459378B2 (en) | 2009-05-13 | 2013-06-11 | Baker Hughes Incorporated | Hybrid drill bit |
| US9004198B2 (en) | 2009-09-16 | 2015-04-14 | Baker Hughes Incorporated | External, divorced PDC bearing assemblies for hybrid drill bits |
| EP2588704B1 (en) | 2010-06-29 | 2017-11-01 | Baker Hughes Incorporated | Drill bits with anti-tracking features |
| US8978786B2 (en) | 2010-11-04 | 2015-03-17 | Baker Hughes Incorporated | System and method for adjusting roller cone profile on hybrid bit |
| BR112013020524B1 (en) | 2011-02-11 | 2020-09-29 | Baker Hughes Incorporated | HYBRID GROUND DRILLING DRILL AND HYBRID GROUND DRILLING DRILL |
| US9782857B2 (en) | 2011-02-11 | 2017-10-10 | Baker Hughes Incorporated | Hybrid drill bit having increased service life |
| WO2013074788A1 (en) | 2011-11-15 | 2013-05-23 | Baker Hughes Incorporated | Hybrid drill bits having increased drilling efficiency |
| CN106164407A (en) * | 2014-05-22 | 2016-11-23 | 哈里伯顿能源服务公司 | There is the Mixed drilling bit of blade and disk |
| MX2016015278A (en) | 2014-05-23 | 2017-03-03 | Baker Hughes Inc | Hybrid bit with mechanically attached rolling cutter assembly. |
| WO2015191028A1 (en) * | 2014-06-09 | 2015-12-17 | Halliburton Energy Services, Inc. | Hybrid bit with roller cones and discs |
| US11428050B2 (en) | 2014-10-20 | 2022-08-30 | Baker Hughes Holdings Llc | Reverse circulation hybrid bit |
| US10557311B2 (en) | 2015-07-17 | 2020-02-11 | Halliburton Energy Services, Inc. | Hybrid drill bit with counter-rotation cutters in center |
| US10689911B2 (en) | 2016-05-25 | 2020-06-23 | Baker Hughes, A Ge Company, Llc | Roller cone earth-boring rotary drill bits including disk heels and related systems and methods |
| US11248419B2 (en) | 2020-02-14 | 2022-02-15 | Halliburton Energy Services, Inc. | Hybrid drill bit |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US1816568A (en) * | 1929-06-05 | 1931-07-28 | Reed Roller Bit Co | Drill bit |
| US4285409A (en) * | 1979-06-28 | 1981-08-25 | Smith International, Inc. | Two cone bit with extended diamond cutters |
| US4408671A (en) * | 1980-04-24 | 1983-10-11 | Munson Beauford E | Roller cone drill bit |
| US4343371A (en) * | 1980-04-28 | 1982-08-10 | Smith International, Inc. | Hybrid rock bit |
| US4444281A (en) * | 1983-03-30 | 1984-04-24 | Reed Rock Bit Company | Combination drag and roller cutter drill bit |
-
1984
- 1984-11-15 WO PCT/US1984/001898 patent/WO1985002223A1/en unknown
- 1984-11-15 EP EP19850900310 patent/EP0162107A1/en not_active Withdrawn
- 1984-11-15 AU AU37409/85A patent/AU3740985A/en not_active Abandoned
- 1984-11-16 CA CA000468104A patent/CA1233168A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| WO1985002223A1 (en) | 1985-05-23 |
| EP0162107A1 (en) | 1985-11-27 |
| AU3740985A (en) | 1985-06-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |