US5025873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self-renewing multi-element cutting structure for rotary drag bit
Assignee: Baker Hughes Holdings LLC
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Filing: 1989-09-29
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Granted: 1991-06-25
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Expires: 2009-09-29
Abstract
Abstract The present invention comprises a rotary drill bit including a cutting structure comprising an array of cutting elements oriented and arranged to facilitate concentration of the load on bit on groups of cutting elements until the elements become dulled or worn, at which point fresh cutting elements are exposed to engage the formation and tube the concentrated bit loading. Preferably, the cutting elements are configured and/or supported to break away from the cutting structure when worn to a certain extent, thereby facilitating exposure of fresh cutting elements to engage the formation.
Inventors
- 👤 Jerry Cerkovnik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:39
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/56; E21B10/567
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
110 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure mounted on said bit face carrying a plurality of cutting elements, at least some of which include impact fracture inducement means therein, said cutting elements being disposed in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located in a different substantially vertical distance from said bit face than at least one other of said rows.
Claim 2
Dependent Claim
110 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure mounted on said bit face carrying a plurality of cutting elements, at least some of which include impact fracture inducement means therein, said cutting elements being disposed in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located in a different substantially vertical distance from said bit face than at least one other of said rows.
Claim 3
Dependent Claim
15 words
The bit of claim 1, wherein the elements of vertically adjacent rows are laterally offset.
Claim 4
Dependent Claim
29 words
The bit of claim 2, wherein the elements of each row having another row therebelow are spaced apart and portions of the elements of each lower row protrude therebetween.
Claim 5
Dependent Claim
12 words
The bit of claim 1, wherein said rows are substantially vertically aligned.
Claim 6
Dependent Claim
22 words
The bit of claim 1, wherein said rows are offset front to back in the direction of cutting movement in stair-step fashion.
Claim 7
Dependent Claim
28 words
The bit of claim 5, wherein the uppermost row of elements from the face of the bit comprises the leading row, taken in the direction of bit rotation.
Claim 8
Dependent Claim
28 words
The bit of claim 5, wherein the uppermost row of elements from the face of the bit comprises the trailing row, taken in the direction of bit rotation.
Claim 9
Dependent Claim
14 words
The bit of claim 1, wherein at least one of said rows is nonlinear.
Claim 10
Dependent Claim
11 words
The bit of claim 8, wherein said nonlinear row is arcuate.
Claim 11
Dependent Claim
108 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure mounted on said bit face carrying a plurality of cutting elements disposed in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located a different substantially vertical distance from said bit face than at least one other of said rows, said cutting structure including voids therein behind at least some of said cutting elements.
Claim 12
Dependent Claim
108 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure mounted on said bit face carrying a plurality of cutting elements disposed in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located a different substantially vertical distance from said bit face than at least one other of said rows, said cutting structure including voids therein behind at least some of said cutting elements.
Claim 13
Dependent Claim
15 words
The bit of claim 10, wherein the elements of vertically adjacent rows are laterally offset.
Claim 14
Dependent Claim
29 words
The bit of claim 11, wherein the elements of each row having another row therebelow are spaced apart and portions of the elements of each lower row protrude therebetween.
Claim 15
Dependent Claim
12 words
The bit of claim 10, wherein said rows are substantially vertically aligned.
Claim 16
Dependent Claim
22 words
The bit of claim 10, wherein said rows are offset front to back in the direction of cutting movement in stair-step fashion.
Claim 17
Dependent Claim
28 words
The bit of claim 14, wherein the uppermost row of elements from the face of the bit comprises the leading row, taken in the direction of bit rotation.
Claim 18
Dependent Claim
28 words
The bit of claim 14, wherein the uppermost row of elements from the face of the bit comprises the trailing row, taken in the direction of bit rotation.
Claim 19
Dependent Claim
14 words
The bit of claim 10, wherein at least one of said rows is nonlinear.
Claim 20
Dependent Claim
11 words
The bit of claim 17, wherein said nonlinear row is arcuate.
Claim 21
Dependent Claim
123 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure including a substantially planar cutting face mounted on said bit face and carrying a plurality of cutting elements disposed on said cutting face in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located a different substantially vertical distance from said bit face than at least one other of said rows, and at least one of said rows protruding from said cutting face in the direction of bit rotation.
Claim 22
Dependent Claim
123 words
A rotary drag bit for penetrating a subterranean formation, comprising: a bit shank for securing said bit to a drill string; a bit body mounted on said bit shank and including a face for contacting said formation; and at least one cutting structure including a substantially planar cutting face mounted on said bit face and carrying a plurality of cutting elements disposed on said cutting face in an array facing in the direction of bit rotation and comprising a plurality of rows, each of said rows being located a different substantially vertical distance from said bit face than at least one other of said rows, and at least one of said rows protruding from said cutting face in the direction of bit rotation.
Claim 23
Dependent Claim
25 words
The bit of claim 19 wherein each protruding row extends further from said cutting face than any other protruding row closer to said bit face.
Claim 24
Dependent Claim
15 words
The bit of claim 19, wherein the elements of vertically adjacent rows are laterally offset.
Claim 25
Dependent Claim
29 words
The bit of claim 21, wherein the elements of each row having another row therebelow are spaced apart and portions of the elements of each lower row protrude therebetween.
Claim 26
Dependent Claim
12 words
The bit of claim 19, wherein said rows are substantially vertically aligned.
Claim 27
Dependent Claim
22 words
The bit of claim 19, wherein said rows are offset front to back in the direction of cutting movement in stair-step fashion.
Claim 28
Dependent Claim
28 words
The bit of claim 24, wherein the uppermost row of elements from the face of the bit comprises the leading row, taken in the direction of cutting movement.
Claim 29
Dependent Claim
28 words
The bit of claim 24, wherein the uppermost row of elements from the face of the bit comprises the trailing row, taken in the direction of cutting movement.
Claim 30
Dependent Claim
14 words
The bit of claim 19, wherein at least one of said rows is nonlinear.
Claim 31
Dependent Claim
11 words
The bit of claim 27, wherein said nonlinear row is arcuate.
References Cited (Backward Citations)
US1923488A
Cited
US2290595A
Cited
US2966949A
Cited
US3140748A
Cited
US3440773A
Cited
US3768581A
Cited
US4073354A
Cited
US4150728A
Cited
US4190126A
Cited
US4116289A
Cited
EP0086086A2
Cited
US4512426A
Cited
US4586574A
Cited
US4533004A
Cited
US4726718A
Cited
US4606418A
Cited
US4673044A
Cited
US4682663A
Cited
US4719979A
Cited
GB2190412A
Cited
US4854399A
Cited
US4913247A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-06-24 | 1994-12-24 | 1995-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-06-24 | 1998-12-24 | 1999-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-06-24 | 2002-12-24 | 2003-06-25 | $7700.00 | Window Closed / Lapsed |