CA2585915A1 - Dual-seal drill bit pressure communication system - Google Patents
Dual-seal drill bit pressure communication system Download PDFInfo
- Publication number
- CA2585915A1 CA2585915A1 CA002585915A CA2585915A CA2585915A1 CA 2585915 A1 CA2585915 A1 CA 2585915A1 CA 002585915 A CA002585915 A CA 002585915A CA 2585915 A CA2585915 A CA 2585915A CA 2585915 A1 CA2585915 A1 CA 2585915A1
- Authority
- CA
- Canada
- Prior art keywords
- secondary seal
- annular
- bit
- leg
- annular secondary
- 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.)
- Granted
Links
- 239000012530 fluid Substances 0.000 claims abstract 22
- 239000004519 grease Substances 0.000 claims abstract 13
- 238000005553 drilling Methods 0.000 claims abstract 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract 6
- 238000005461 lubrication Methods 0.000 claims abstract 3
- 239000007921 spray Substances 0.000 claims abstract 3
- 229920000642 polymer Polymers 0.000 claims abstract 2
- 238000007789 sealing Methods 0.000 claims 22
- 230000003068 static effect Effects 0.000 claims 7
- 239000002245 particle Substances 0.000 claims 3
- 239000007787 solid Substances 0.000 claims 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims 2
- 230000001050 lubricating effect Effects 0.000 claims 1
- 239000002480 mineral oil Substances 0.000 claims 1
- 235000010446 mineral oil Nutrition 0.000 claims 1
- 239000003921 oil Substances 0.000 claims 1
- 239000000377 silicon dioxide Substances 0.000 claims 1
- 239000002562 thickening agent Substances 0.000 claims 1
- 238000002955 isolation Methods 0.000 abstract 1
Landscapes
- Earth Drilling (AREA)
Abstract
A drill bit for use in a borehole at least partially containing drilling fluid includes a bit body having at least two bit components, including at least one leg, the leg having a journal segment, and a roller cone rotatably mounted upon the journal segment and forming at least one bearing cavity therebetween. Also included is an annular primary seal disposed between the leg and the roller cone, an annular secondary seal disposed between the leg and the roller cone and between the annular primary seal and the borehole and an annular space disposed between the annular primary seal and the annular secondary seal, the annular space at least partially containing fluid and being in substantially absolute fluid isolation from the bearing cavity and means for permitting the flow of fluid from the annular space to the borehole. The annular secondary seal may be primarily elastomeric and the means for permitting the flow of fluid may further permit the flow of fluid from the borehole to the annular space. The annular space may at least partially include a grease possessing a water washout value of under approximately 50% per ASTM D-4049 water spray test for lubrication characteristics and the grease may include a polymer tackifier of between approximately 1% and approximately 5% by weight.
Claims (25)
1. A drill bit for use in a borehole at least partially containing drilling fluid, comprising:
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal having a sealing surface engageable with at least one said bit component, said sealing surface having first and second adjacent regions, wherein the thickness of said annular secondary seal at said first region of said sealing surface is greater than the thickness of said annular secondary seal at said second region of said sealing surface.
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal having a sealing surface engageable with at least one said bit component, said sealing surface having first and second adjacent regions, wherein the thickness of said annular secondary seal at said first region of said sealing surface is greater than the thickness of said annular secondary seal at said second region of said sealing surface.
2. The drill bit of claim 1 wherein said sealing surface is a primarily dynamic sealing surface.
3. The drill bit of claim 1 wherein said sealing surface is a primarily static sealing surface.
4. The drill bit of claim 1 wherein said annular secondary seal includes first and second side surfaces adjacent to said sealing surface, further wherein at least one of said bit components includes at least one non-energizing surface at least partially engageable with one of said first and second side surfaces of said annular secondary seal, wherein at least one of said first and second side surfaces of said annular secondary seal and said non-energizing surface of said bit component includes first and second sections, wherein said first section is uneven with respect to said second section.
5. The drill bit of claim 4 wherein said first section includes at least one surface feature.
6. The drill bit of claim 1 wherein said annular secondary seal includes a lip, wherein said second region of said sealing surface is formed on said lip.
7. The drill bit of claim 6 wherein said lip is at least partially bellows-shaped.
8. A drill bit for use in a borehole at least partially containing drilling fluid, comprising:
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including at least one region having a tapered cross-section.
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including at least one region having a tapered cross-section.
9. The drill bit of claim 8 wherein said at least one region of said annular secondary seal includes an outer surface, said annular secondary seal including a primarily dynamic sealing surface, wherein at least a portion of said primarily dynamic sealing surface is disposed on said outer surface of said region having a tapered cross-section.
10. The drill bit of claim 8 wherein said at least one region of said annular secondary seal includes an outer surface, said annular secondary seal including a primarily static sealing surface, wherein at least a portion of said primarily static sealing surface is disposed on said outer surface of said region having a tapered cross-section.
11. The drill bit of claim 8 wherein said annular secondary seal includes first and second side surfaces adjacent to said sealing surface, further wherein at least one of said bit components includes at least one non-energizing surface at least partially engageable with one of said first and second side surfaces of said annular secondary seal, wherein at least one of said first and second side surfaces of said annular secondary seal and said non-energizing surface of said bit component includes first and second sections, wherein said first section is uneven with respect to said second section.
12. The drill bit of claim 11 wherein said first section includes at least one surface feature.
13. The drill bit of claim 8 wherein the cross-section of said annular secondary seal is tapered around the entire circumference of said annular secondary seal.
14. A drill bit for use in a borehole at least partially containing fluid, comprising:
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween, wherein at least one of said bit components includes at least two seal engagement surfaces;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including a primarily dynamic sealing surface and a primarily static sealing surface, each said sealing surface of said annular secondary seal having a width and being engageable at said width with one of said seal engagement surfaces of said bit components, at least one of said annular primarily dynamic and primarily static sealing surfaces including first and second regions, said width of said first region being smaller than said width of said second region.
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween, wherein at least one of said bit components includes at least two seal engagement surfaces;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including a primarily dynamic sealing surface and a primarily static sealing surface, each said sealing surface of said annular secondary seal having a width and being engageable at said width with one of said seal engagement surfaces of said bit components, at least one of said annular primarily dynamic and primarily static sealing surfaces including first and second regions, said width of said first region being smaller than said width of said second region.
15. A drill bit for use in a borehole at least partially containing fluid, comprising:
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including at least one region having an at least partially non-symmetrical cross-section.
a bit body having at least two bit components, said bit components including at least one leg, said leg having a journal segment, said bit components further including a roller cone rotatably mounted upon said journal segment and forming at least one bearing cavity therebetween;
an annular primary seal disposed between said leg and said roller cone;
and an annular secondary seal disposed between said leg and said roller cone and between said annular primary seal and the borehole, said annular secondary seal including at least one region having an at least partially non-symmetrical cross-section.
16. The drill bit of claim 15 wherein said region of said annular secondary seal has an outer surface, further wherein said annular secondary seal includes a primarily dynamic sealing surface and a primarily static sealing surface, wherein at least a portion of at least one of said primarily dynamic and primarily static sealing surfaces is disposed on said outer surface.
17. An incompressible fluid for use to lubricate a seal in a sealed bearing drill bit, the drill bit useful in a borehole at least partially containing drilling fluid and solid particles, comprising:
a grease capable of lubricating at least one seal after said grease contacts drilling fluid.
a grease capable of lubricating at least one seal after said grease contacts drilling fluid.
18. The incompressible fluid of claim 17 wherein said grease is capable of trapping solid particles to assist in preventing the ingress of solid particles to the seal.
19. The incompressible fluid of claim 17 where said grease is capable of transmitting energy between first and second seals after said grease contacts drilling fluid.
20. The incompressible fluid of claim 17 wherein said grease is disposed between a primary seal and a secondary seal.
21. The incompressible fluid of claim 17 wherein said grease possesses a water washout value of under approximately 50% per ASTM D-4049 water spray test for lubrication characteristics.
22. The incompressible fluid of claim 17 wherein said grease possesses a water washout value of under approximately 30% per ASTM D-4049 water spray test for lubrication characteristics.
23. The incompressible fluid of claim 21 wherein said grease includes a polymer tackifier of between approximately 1% and approximately 5% by weight.
24. The incompressible fluid of claim 23 wherein said grease includes between approximately 10 percent and approximately 30 percent by weight of at least one mineral oil and between approximately 70 percent and approximately 90 percent by weight of at least one synthetic oil.
25. The incompressible fluid of claim 24 wherein said grease includes between approximately 1.0 percent and approximately 10.0 percent by weight of silica thickener and between approximately 1.0 percent and approximately 5.0 percent by weight of tackifier.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/982,081 | 1997-12-01 | ||
| US08/982,081 US6033117A (en) | 1995-12-19 | 1997-12-01 | Sealed bearing drill bit with dual-seal configuration |
| US6714997P | 1997-12-02 | 1997-12-02 | |
| US60/067,149 | 1997-12-02 | ||
| CA 2254741 CA2254741C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2254741 Division CA2254741C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2585915A1 true CA2585915A1 (en) | 1999-06-01 |
| CA2585915C CA2585915C (en) | 2010-08-17 |
Family
ID=38229499
Family Applications (3)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2585249A Expired - Lifetime CA2585249C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
| CA2585915A Expired - Lifetime CA2585915C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
| CA2585123A Expired - Lifetime CA2585123C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2585249A Expired - Lifetime CA2585249C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
Family Applications After (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2585123A Expired - Lifetime CA2585123C (en) | 1997-12-01 | 1998-12-01 | Dual-seal drill bit pressure communication system |
Country Status (1)
| Country | Link |
|---|---|
| CA (3) | CA2585249C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320163A (en) * | 2022-03-14 | 2022-04-12 | 西南石油大学 | Sealing element for roller bit and roller bit |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108442886B (en) * | 2018-05-22 | 2023-11-17 | 西南石油大学 | Split tricone bit |
| US10954730B1 (en) | 2019-06-07 | 2021-03-23 | Qes Pressure Control Llc | Pressure control for gate-valve and hot-tap drilling systems |
-
1998
- 1998-12-01 CA CA2585249A patent/CA2585249C/en not_active Expired - Lifetime
- 1998-12-01 CA CA2585915A patent/CA2585915C/en not_active Expired - Lifetime
- 1998-12-01 CA CA2585123A patent/CA2585123C/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114320163A (en) * | 2022-03-14 | 2022-04-12 | 西南石油大学 | Sealing element for roller bit and roller bit |
| CN114320163B (en) * | 2022-03-14 | 2022-05-10 | 西南石油大学 | Sealing element for roller bit and roller bit |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2585915C (en) | 2010-08-17 |
| CA2585249A1 (en) | 1999-06-01 |
| CA2585123A1 (en) | 1999-06-01 |
| CA2585249C (en) | 2010-06-15 |
| CA2585123C (en) | 2010-07-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5080183A (en) | Seal assembly for roller cutter drill bit having a pressure balanced lubrication system | |
| CA1332180C (en) | Seal and seal shield assembly for rotary drill bits | |
| ITTO930218A1 (en) | DRILLING TIP | |
| US9429238B2 (en) | Dynamic backup ring assembly | |
| WO2002066781A3 (en) | Metal-face-seal rock bit and lubricant passage for a rock bit | |
| SE9703653D0 (en) | Seal for drill bit and drill bit provided with such seal | |
| US4671368A (en) | Earth boring bit with shear compression seal | |
| CN101490359A (en) | Excluder ring for earth-boring bit | |
| WO2002010617A1 (en) | Pulley unit | |
| CA2449329A1 (en) | Self-lubericating sealing ring | |
| AU758373B2 (en) | Drilling head with cone rock bit | |
| EP0821132A3 (en) | Seal assembly for rolling cutter drill bits | |
| CA2465980A1 (en) | Erosion resistant drilling head assembly | |
| US4577705A (en) | Bellows lubricant pressurizer for sealed bearing rock bits | |
| CA2397141A1 (en) | Rock bit seal with extrusion prevention member | |
| CA2585915A1 (en) | Dual-seal drill bit pressure communication system | |
| CA2151685A1 (en) | Rock Bit | |
| CN210510283U (en) | Reducer output shaft sealing device of shield construction electric locomotive | |
| CN114278679B (en) | Universal joint with waste oil recovery structure | |
| CN204025367U (en) | With the agricultural machinery bearing support of special seal | |
| CN104879478B (en) | Sealing device of amphibious track-laying vehicle side speed reducer | |
| US3195904A (en) | Roll neck seal | |
| CN102877799A (en) | Cardan joint for rotary drilling rig | |
| CA2254741A1 (en) | Dual-seal drill bit pressure communication system | |
| CN202926254U (en) | Cardan joint for rotary drilling rig |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181203 |