US20100038146A1 - Bit Cone With Hardfaced Nose - Google Patents
Bit Cone With Hardfaced Nose Download PDFInfo
- Publication number
- US20100038146A1 US20100038146A1 US12/541,399 US54139909A US2010038146A1 US 20100038146 A1 US20100038146 A1 US 20100038146A1 US 54139909 A US54139909 A US 54139909A US 2010038146 A1 US2010038146 A1 US 2010038146A1
- Authority
- US
- United States
- Prior art keywords
- cutter
- compacts
- bit
- row
- metal shell
- 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.)
- Abandoned
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
- E21B10/50—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of roller type
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B10/00—Drill bits
- E21B10/08—Roller bits
- E21B10/16—Roller bits characterised by tooth form or arrangement
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)
- Drilling Tools (AREA)
Abstract
A drill bit for drilling a wellbore, the drill bit having a cutter which has tungsten carbide inserts and a spear point. The spear point has a neck that joins a smooth portion of the cutter and blades that extend from the neck and converge to an apex. The blades define valleys or spaces between them. A layer of hardfacing is applied to the entire spear point including the interim spaces and the neck.
Description
- This application claims priority to
provisional application 61/088,991, filled Aug. 14, 2008. - This invention relates to improvements to earth-boring bits having rotating cones with cutting structures and in particular to hardfacing a spear point to enhance wear resistance.
- In drilling bore holes in earthen formations by the rotary method, rock bits fitted with one, two or three rolling cutters are employed. The bit is s secured to the lower end of a drill string that is rotated from the surface, or the bit is rotated by downhole motor or turbines. The cutters mounted on the bit roll and slide upon the bottom of the bore hole as the bit is rotated, thereby engaging and disengaging the formation material to be removed. The roller cutters are provides with cutting elements that are forced to penetrate and gouge the bottom of the borehole by weights of the drill string. The cuttings from the bottom and sidewalls of the borehole are washed away by drilling fluid that is pumped down from the surface through the hollow drill string.
- One type of cutting element in widespread use is a tungsten carbide insert which is interference pressed into an aperture in the cutter body. Tungsten carbide is metal which is harder than the steel body of the cutter and has a cylindrical portion and a cutting tip portion. The cutting tip portion is formed in various configurations, such as chisel, hemispherical or conical, depending upon the type of formation to be drilled. Some of the inserts have very aggressive cutting structure designs and carbide grades that allow the bits to drill in both soft and medium formations with the same bit.
- Another type of rolling cutter earth-boring bit is commonly known as a “steel-tooth” or “milled-tooth” bit. Typically these bits are for penetration into relatively soft geological formations of the earth. The strength and fracture-toughness of the steel teeth permits the use of relatively long teeth, which enables the aggressive gouging and scraping actions that are advantageous for rapid penetration of soft formations with low compressive strengths.
- However, it is rare that geological formations consist entirely of soft material with low compressive strength. Often, there are streaks of hard, abrasive materials that a steel-tooth bit should penetrate economically without damage to the bit. Although steel teeth possess good strength, abrasion resistance is inadequate to permit continued rapid penetration of hard or abrasive streaks. Consequently, it has been common in the arts since at least the 1930s to provide a layer of wear-resistance metallurgical material called “hardfacing” over those portions of the teeth to the severest wear. The hardfacing typically consists of extremely hard particles, such as sintered, cast, or macro-crystalline tungsten carbide, dispersed in a steel matrix. Such hardfacing materials are applied by welding a metallic matrix to the surface to be hardfaced and applying the hard particles to the matrix to form a uniform dispersion of hard particles in the matrix.
- Unlike a tungsten carbide insert bit teeth of a steel-tooth bit are not susceptible to stress cracking due to excessive heat. A steel-tooth bit would be able to drill the relatively soft non-abrasive formations mentioned above with case stress cracking on heel rows of insert bits. However, because of the hardness and thickness of adjacent formations, a steel-tooth bit would wear too quickly, thus is not a preferred choice in those areas.
-
FIG. 1 shows a prior art earth-boring bit 11, having abody 13 with threebit legs 15 depending therefrom. Acone 17 is rotatably mounted to each of thebit legs 15. Eachcone 17 is formed of a steel shell or body. Eachcone 17 has a plurality of inner row compacts orcarbide inserts 19, arranged in at least one inner row. A plurality of outer orheel row compacts 21 are adjacent to agage surface 23 of eachcone 17. It is common forcones 17 to have different numbers of rows. In the embodiment shown,heel row compacts 21 are generally ovoid, although different shapes could be used. - In this invention, the bit has a cutter which has tungsten carbide inserts and a spear point. The spear point has a neck that joins a smooth portion of the cutter and blades that extend from the neck and converge to an apex. The blades define valleys or spaces between them.
- A layer of hardfacing is applied to the entire spear point including the interim spaces and the neck. This hardfacing may be of a conventional type comprising tungsten carbide particles in a steel alloy matrix.
-
FIG. 1 is a side elevation of a prior art earth-boring bit. -
FIG. 2 is a bottom view of an earth-boring bit having a cone hardfaced in accordance with this invention. - Referring to
FIG. 2 ,bit 27 of this invention has a body, bit legs, and a threaded section that are not shown but may be the same as inprior art bit 11 ofFIG. 1 .Bit 27 has afirst cone 29, asecond cone 31, and athird cone 33. Eachcone compacts 35 located on outer and inner rows.Inserts 37 are also located along the inner and outer rows of eachcone Compacts 35 are formed of cemented carbide, typically tungsten carbide that is usually homogenous and formed in a die and consolidated by sintering techniques. Optionally, at least one layer of diamond may be formed on the cutting tip. Also, as another option, portions of the carbide material placed in the die and sintered may be of different grades. -
First cone 29 has anouter row 39 and anintermediate row 41 ofcompacts 35, which are located adjacent the gage surface offirst cone 29. Aninner row 43 is located a short distance inward fromintermediate row 41 toward the bit axis. A thin annularconical band 45 is located betweenintermediate row 41 andinner row 43.First cone 29 has aspear point 47 that is conventional and comprises radially extending blades. A layer ofhardfacing 49 is applied overspear 47 and a segment of anose section 50 ofcone 29. Aconical surface 51 extends frominner row 43 to the neck portion ofspear point 47. A layer ofhardfacing 49 may be applied to a portion ofconical surface 51 near the neck portion ofspear 47. The hardfacing 49 ofspear 47 reduces the amount of wear in thenose area 50. Hardfacing 49, combined with the use ofcompacts 35 oninner row 43,intermediate row 41, andouter rows 39 reduces the total amount of wear ofcone 29. -
Second cone 31 has anouter row 53 and anintermediate row 55 ofcompacts 35. Thenose portion 56 ofcone 31 extends axially fromintermediate row 55, formingconical band 57. In this embodiment, aninner row 59 ofcompacts 35 are located on thenose portion 56 ofcone 31. Alternatively, milled steel teeth could be formed on thenose portion 56 ofcone 31, in place ofcompacts 35 oninner row 59. If an inner row of steel teeth were formed on thenose portion 56 ofcone 31, hardfacing could be applied over the teeth and sections of thenose portion 56 ofcone 31 andconical band 57. -
Third cone 33 has anouter row 61 and anintermediate row 63 ofcompacts 35. The nose portion ofcone 33 extends axially fromintermediate row 63, formingconical band 65. In this embodiment aninner row 67 ofcompacts 35 are located on the nose portion ofcone 33. An additional set ofsmall compacts 68 are located on theend 69 of the nose portion ofcone 33. Alternatively, milled steel teeth could be formed on the nose portion ofcone 33, in place ofcompacts 35 oninner row 67 andcompacts 68 onnose end 69. If an inner row of steel teeth were placed on the nose portion ofcone 33, hardfacing could be applied over the teeth, and sections of the nose portion ofcone 33 andconical band 65. - In operation,
bit 27 is run conventionally. The combination ofcompacts 35, inserts 37, andhardfacing 49 applied to thenose section 50 ofcone 29 reduces wear and erosion, increasing the life of thebit 27. While the invention has been shown in only one of its forms, it should be apparent to those skilled in the art that it is not so limited but is susceptible to various changes without departing from the scope of the invention.
Claims (18)
1. An earth boring bit, comprising in combination:
a body with a longitudinal bit axis;
three bit legs depending from the body;
first, second, and third cutters, each rotatably mounted to one of the bit legs;
at least one of the cutters having a metal shell with a nose section extending inward toward the bit axis from the metal shell, the nose section having compacts located thereon and protruding therefrom for disintegrating an earth formation, the nose section being free of hardfacing; and
at least one other of the cutters having a metal shell with a nose section extending toward the bit axis, the nose section of the at least one other of the cutters having hardfacing located thereon.
2. The earth boring bit of claim 1 , wherein the nose section having hardfacing located thereon further comprises:
a spear point having a neck which joins the metal shell of the at least one other of the cutters, the spear point having a plurality of blades extending from the neck, the blades converging to an apex and being circumferentially separated from each other about a cutter axis of the at least one other of the cutters, defining a space between each of the blades; and
a layer of hardfacing formed on the neck, the blades and the spaces between each of the blades, the hardfacing being tungsten carbide particles in a matrix for protecting the neck and spaces from erosion.
3. The earth boring bit of claim 1 , wherein the nose section having hardfacing located thereon extends a desired distance toward the bit axis and is positioned closest to the bit axis than any of the other cutters:
4. An earth boring bit, comprising in combination:
a body with a bit axis;
three bit legs depending from the body;
first, second, and third cutters, each rotatably mounted to one of the bit legs;
the first cutter having a metal shell with at least one row of compacts located thereon and protruding from the metal shell for disintegrating an earth formation, the metal shell having a smooth conical surface extending inward from the at least one row of compacts, the smooth conical surface being free of hardfacing;
a spear point having a neck which joins the smooth conical surface of the first cutter, the spear point having a plurality of blades extending from the neck, the blades converging to an apex and being circumferentially separated from each other about a cutter axis of the first cutter, defining a space between each of the blades; and
a layer of hardfacing formed on the neck, the blades and the spaces between each of the blades, the hardfacing being tungsten carbide particles in a matrix for protecting the neck and spaces from erosion.
5. The earth boring bit of claim 4 , wherein the spear point extends axially along the cutter axis of the first cutter a select distance such that the apex of the spear is closer to the bit axis than any portion of the second and third cutters.
6. The earth boring bit of claim 4 , wherein said at least one row of compacts comprises:
an outer row of compacts located thereon, an intermediate row of compacts located thereon at a lesser distance from the bit axis than the outer row, and an inner row of compacts located thereon at a lesser distance from the bit axis than the intermediate row.
7. The earth boring bit of claim 6 , wherein the first cutter is free of hardfacing from the outer row of compacts to the neck of the spear point.
8. The earth boring bit of claim 7 , wherein each of the second and third cutters further comprises:
a metal shell with a nose section containing at least one compact that protrudes therefrom for disintegrating the earth formation.
9. The earth boring bit of claim 4 , further comprising:
the second cutter having a metal shell with a nose section extending axially toward the longitudinal axis from the metal shell along the axis of the second cutter, the nose section of the second cutter having compacts protruding thereform, the nose section of the second cutter being free of hardfacing.
10. The earth boring bit of claim 9 , further comprising:
the second cutter having an outer row of compacts protruding therefrom, an intermediate row of compacts protruding thereform and being at a lesser distance from the bit axis than the outer row of compacts of the second cutter and a farther distance from the bit axis than the compacts located on the nose section of the second cutter.
11. The earth boring bit of claim 4 , further comprising:
the third cutter having a metal shell with a nose section extending axially toward the longitudinal axis from the metal shell along the axis of the second cutter, the nose section of the third cutter having compacts protruding therefrom, the nose section of the third cutter being free of hardfacing.
12. The earth boring bit of claim 11 , further comprising:
the third cutter having an outer row of compacts protruding therefrom, an intermediate row of compacts protruding therefrom and at a lesser distance from the bit axis than the outer row of compacts of the third cutter.
13. An earth boring bit comprising in combination:
a body with a bit axis;
three bit legs depending from the body;
first, second, and third cutters, each rotatably mounted to one of the bit legs;
the first cutter having a metal shell with an outer row, an intermediate row, and an inner row of compacts located thereon and protruding therefrom, the intermediate row being at a lesser distance from the bit axis than the outer row, and the inner row being at a lesser distance from the bit axis than the intermediate row, the metal shell having a smooth conical surface extending inward from the inner row of compacts, the smooth conical surface being free of hardfacing;
a spear point having a neck which joins the smooth conical surface of the first cutter, the spear point having a plurality of blades extending from the neck, the blades converging to an apex and being circumferentially separated from each other about a first cutter axis of the first cutter, defining a space between each of the blades;
a layer of hardfacing formed on the neck, the blades and the spaces between each of the blades, the hardfacing being tungsten carbide particles in a matrix for protecting the neck and spaces from erosion; and
the second and third cutters each having a metal shell with at least one row of compacts located thereon and protruding therefrom.
14. The earth boring bit of claim 13 , wherein the metal shell of the first cutter is free of hardfacing between the outer row and the neck of the spear point.
15. The earth boring bit of claim 13 , wherein the second cutter further comprises:
a metal shell with a nose section extending inward toward the bit axis, the nose section of the second cutter having compacts located thereon and protruding therefrom;
an outer row of compacts located on the metal shell of the second cutter and protruding therefrom outward from the compacts on the nose section of the second cutter; and
an intermediate row of compacts located on the metal shell of the second cutter and protruding therefrom between the compacts on the nose section and the outer row of compacts on the metal shell of the second cutter.
16. The earth boring bit of claim 15 , wherein the third cutter further comprises:
a metal shell with a nose section extending inward toward the bit axis, the nose section of the third cutter having a row of compacts located thereon and protruding therefrom;
an outer row of compacts located on the metal shell of the third cutter and protruding therefrom; and
an intermediate row of compacts located on the metal shell of the third cutter between the compacts on the nose section and the outer row of compacts on the metal shell of the third cutter.
17. The earth boring bit of claim 16 , wherein:
a distance between the outer row of compacts and the intermediate row of compacts on the first cutter, measured along the first cutter axis, is less than a distance between the outer row of compacts and the intermediate row of compacts on the second cutter, measured along a second cutter axis.
18. The earth boring bit of claim 17 , wherein:
the distance between the outer row of compacts and the intermediate row of compacts on the second cutter is less than a distance between the outer row of compacts and the intermediate row of compacts on the third cutter, measured along a third cutter axis.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/541,399 US20100038146A1 (en) | 2008-08-14 | 2009-08-14 | Bit Cone With Hardfaced Nose |
US13/030,878 US20110168452A1 (en) | 2008-08-14 | 2011-02-18 | Tungsten Carbide Bit with Hardfaced Nose Area |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US8899108P | 2008-08-14 | 2008-08-14 | |
US12/541,399 US20100038146A1 (en) | 2008-08-14 | 2009-08-14 | Bit Cone With Hardfaced Nose |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US13/030,878 Continuation-In-Part US20110168452A1 (en) | 2008-08-14 | 2011-02-18 | Tungsten Carbide Bit with Hardfaced Nose Area |
Publications (1)
Publication Number | Publication Date |
---|---|
US20100038146A1 true US20100038146A1 (en) | 2010-02-18 |
Family
ID=41669700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/541,399 Abandoned US20100038146A1 (en) | 2008-08-14 | 2009-08-14 | Bit Cone With Hardfaced Nose |
Country Status (4)
Country | Link |
---|---|
US (1) | US20100038146A1 (en) |
EP (1) | EP2318638A2 (en) |
CA (1) | CA2733255A1 (en) |
WO (1) | WO2010019834A2 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110168452A1 (en) * | 2008-08-14 | 2011-07-14 | Baker Hughes Incorporated | Tungsten Carbide Bit with Hardfaced Nose Area |
US20150053422A1 (en) * | 2013-08-23 | 2015-02-26 | Varel International Ind., L.P. | Hybrid rotary cone drill bit |
US20160145945A1 (en) * | 2014-11-25 | 2016-05-26 | Smith International, Inc. | Low collision damage bit |
US10337272B2 (en) * | 2016-02-16 | 2019-07-02 | Varel International Ind., L.P. | Hybrid roller cone and junk mill bit |
Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533259A (en) * | 1946-06-28 | 1950-12-12 | Hughes Tool Co | Cluster tooth cutter |
US3397751A (en) * | 1966-03-02 | 1968-08-20 | Continental Oil Co | Asymmetric three-cone rock bit |
US3412817A (en) * | 1965-11-10 | 1968-11-26 | Continental Oil Co | Roller cone drill bit |
US4256194A (en) * | 1978-05-19 | 1981-03-17 | Varel Manufacturing Company | Rotary drill bit having a solid forged, unitary body |
US4726432A (en) * | 1987-07-13 | 1988-02-23 | Hughes Tool Company-Usa | Differentially hardfaced rock bit |
US4940099A (en) * | 1989-04-05 | 1990-07-10 | Reed Tool Company | Cutting elements for roller cutter drill bits |
US5131480A (en) * | 1990-07-10 | 1992-07-21 | Smith International, Inc. | Rotary cone milled tooth bit with heel row cutter inserts |
US5224560A (en) * | 1990-10-30 | 1993-07-06 | Modular Engineering | Modular drill bit |
US5311958A (en) * | 1992-09-23 | 1994-05-17 | Baker Hughes Incorporated | Earth-boring bit with an advantageous cutting structure |
US5351768A (en) * | 1993-07-08 | 1994-10-04 | Baker Hughes Incorporated | Earth-boring bit with improved cutting structure |
US5353885A (en) * | 1991-05-01 | 1994-10-11 | Smith International, Inc. | Rock bit |
US5445231A (en) * | 1994-07-25 | 1995-08-29 | Baker Hughes Incorporated | Earth-burning bit having an improved hard-faced tooth structure |
US5542485A (en) * | 1993-07-08 | 1996-08-06 | Baker Hughes Incorporated | Earth-boring bit with improved cutting structure |
US5833020A (en) * | 1996-04-10 | 1998-11-10 | Smith International, Inc. | Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty |
US5979575A (en) * | 1998-06-25 | 1999-11-09 | Baker Hughes Incorporated | Hybrid rock bit |
US6253862B1 (en) * | 1999-02-03 | 2001-07-03 | Baker Hughes Incorporated | Earth-boring bit with cutter spear point hardfacing |
US6401839B1 (en) * | 1998-08-31 | 2002-06-11 | Halliburton Energy Services, Inc. | Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation |
US7343990B2 (en) * | 2006-06-08 | 2008-03-18 | Baker Hughes Incorporated | Rotary rock bit with hardfacing to reduce cone erosion |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5038640A (en) * | 1990-02-08 | 1991-08-13 | Hughes Tool Company | Titanium carbide modified hardfacing for use on bearing surfaces of earth boring bits |
JP3010430U (en) * | 1994-10-20 | 1995-05-02 | 石油鑿井機製作株式会社 | Drill bit |
-
2009
- 2009-08-14 CA CA2733255A patent/CA2733255A1/en not_active Abandoned
- 2009-08-14 EP EP09807332A patent/EP2318638A2/en not_active Withdrawn
- 2009-08-14 US US12/541,399 patent/US20100038146A1/en not_active Abandoned
- 2009-08-14 WO PCT/US2009/053801 patent/WO2010019834A2/en active Application Filing
Patent Citations (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2533259A (en) * | 1946-06-28 | 1950-12-12 | Hughes Tool Co | Cluster tooth cutter |
US3412817A (en) * | 1965-11-10 | 1968-11-26 | Continental Oil Co | Roller cone drill bit |
US3397751A (en) * | 1966-03-02 | 1968-08-20 | Continental Oil Co | Asymmetric three-cone rock bit |
US4256194A (en) * | 1978-05-19 | 1981-03-17 | Varel Manufacturing Company | Rotary drill bit having a solid forged, unitary body |
US4726432A (en) * | 1987-07-13 | 1988-02-23 | Hughes Tool Company-Usa | Differentially hardfaced rock bit |
US4940099A (en) * | 1989-04-05 | 1990-07-10 | Reed Tool Company | Cutting elements for roller cutter drill bits |
US5131480A (en) * | 1990-07-10 | 1992-07-21 | Smith International, Inc. | Rotary cone milled tooth bit with heel row cutter inserts |
US5224560A (en) * | 1990-10-30 | 1993-07-06 | Modular Engineering | Modular drill bit |
US5353885A (en) * | 1991-05-01 | 1994-10-11 | Smith International, Inc. | Rock bit |
US5311958A (en) * | 1992-09-23 | 1994-05-17 | Baker Hughes Incorporated | Earth-boring bit with an advantageous cutting structure |
US5351768A (en) * | 1993-07-08 | 1994-10-04 | Baker Hughes Incorporated | Earth-boring bit with improved cutting structure |
US5542485A (en) * | 1993-07-08 | 1996-08-06 | Baker Hughes Incorporated | Earth-boring bit with improved cutting structure |
US5445231A (en) * | 1994-07-25 | 1995-08-29 | Baker Hughes Incorporated | Earth-burning bit having an improved hard-faced tooth structure |
US5833020A (en) * | 1996-04-10 | 1998-11-10 | Smith International, Inc. | Rolling cone bit with enhancements in cutter element placement and materials to optimize borehole corner cutting duty |
US5979575A (en) * | 1998-06-25 | 1999-11-09 | Baker Hughes Incorporated | Hybrid rock bit |
US6401839B1 (en) * | 1998-08-31 | 2002-06-11 | Halliburton Energy Services, Inc. | Roller cone bits, methods, and systems with anti-tracking variation in tooth orientation |
US6253862B1 (en) * | 1999-02-03 | 2001-07-03 | Baker Hughes Incorporated | Earth-boring bit with cutter spear point hardfacing |
US7343990B2 (en) * | 2006-06-08 | 2008-03-18 | Baker Hughes Incorporated | Rotary rock bit with hardfacing to reduce cone erosion |
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20110168452A1 (en) * | 2008-08-14 | 2011-07-14 | Baker Hughes Incorporated | Tungsten Carbide Bit with Hardfaced Nose Area |
WO2013101264A2 (en) * | 2011-02-18 | 2013-07-04 | Baker Hughes Incorporated | Tungsten carbide bit with hardfaced nose area |
WO2013101264A3 (en) * | 2011-02-18 | 2013-10-03 | Baker Hughes Incorporated | Tungsten carbide bit with hardfaced nose area |
US20150053422A1 (en) * | 2013-08-23 | 2015-02-26 | Varel International Ind., L.P. | Hybrid rotary cone drill bit |
CN105683482A (en) * | 2013-08-23 | 2016-06-15 | 维拉国际工业有限公司 | Hybrid rotary cone drill bit |
US9376866B2 (en) * | 2013-08-23 | 2016-06-28 | Varel International Ind., L.P. | Hybrid rotary cone drill bit |
US10538970B2 (en) | 2013-08-23 | 2020-01-21 | Varel International Ind., L.P. | Method for drilling out a plug using a hybrid rotary cone drill bit |
US20160145945A1 (en) * | 2014-11-25 | 2016-05-26 | Smith International, Inc. | Low collision damage bit |
US10337272B2 (en) * | 2016-02-16 | 2019-07-02 | Varel International Ind., L.P. | Hybrid roller cone and junk mill bit |
Also Published As
Publication number | Publication date |
---|---|
EP2318638A2 (en) | 2011-05-11 |
WO2010019834A3 (en) | 2010-06-03 |
WO2010019834A2 (en) | 2010-02-18 |
CA2733255A1 (en) | 2010-02-18 |
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Legal Events
Date | Code | Title | Description |
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AS | Assignment |
Owner name: BAKER HUGHES INCORPORATED,TEXAS Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:FELDERHOFF, FLOYD C., MR.;FREEMAN, MARK A., MR.;MASSEY, ALAN J., MR.;AND OTHERS;SIGNING DATES FROM 20090810 TO 20090813;REEL/FRAME:023101/0464 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |