CA2585123A1 - Dual-seal drill bit pressure communication system - Google Patents
Dual-seal drill bit pressure communication system Download PDFInfo
- Publication number
- CA2585123A1 CA2585123A1 CA002585123A CA2585123A CA2585123A1 CA 2585123 A1 CA2585123 A1 CA 2585123A1 CA 002585123 A CA002585123 A CA 002585123A CA 2585123 A CA2585123 A CA 2585123A CA 2585123 A1 CA2585123 A1 CA 2585123A1
- Authority
- CA
- Canada
- Prior art keywords
- annular
- leg
- bit
- sealing surface
- drill bit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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 (16)
1. A drill bit for use in a borehole 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 between said bearing cavity and the borehole, said annular primary seal having a primarily dynamic sealing surface;
an annular secondary seal disposed between said annular primary seal and the borehole, said annular secondary seal having a primarily dynamic sealing surface;
wherein a first contact pressure occurs at said primarily dynamic sealing surface of said annular primary seal and a second contact pressure occurs at said primarily dynamic sealing surface of said annular secondary seal, said first contact pressure being greater than said second contact pressure; and an annular space disposed between said annular primary seal and said annular secondary seal, said annular space at least partially containing fluid and in substantially absolute fluid isolation from said bearing cavity.
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 between said bearing cavity and the borehole, said annular primary seal having a primarily dynamic sealing surface;
an annular secondary seal disposed between said annular primary seal and the borehole, said annular secondary seal having a primarily dynamic sealing surface;
wherein a first contact pressure occurs at said primarily dynamic sealing surface of said annular primary seal and a second contact pressure occurs at said primarily dynamic sealing surface of said annular secondary seal, said first contact pressure being greater than said second contact pressure; and an annular space disposed between said annular primary seal and said annular secondary seal, said annular space at least partially containing fluid and in substantially absolute fluid isolation from said bearing cavity.
2. The drill bit of claim 1 wherein said annular secondary seal is primarily elastomeric.
3. The drill bit of claim 1 wherein said fluid in said annular space is capable of flowing past said annular secondary seal from said annular space to the borehole.
4. 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;
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 primarily dynamic sealing surface and a primarily static sealing surface, wherein a first contact pressure occurs at said primarily dynamic sealing surface and a second contact pressure occurs at said primarily static sealing surface, said first contact pressure and said second contact pressure being unequal; and an annular space disposed between said annular primary seal and said annular secondary seal, said annular space at least partially containing fluid and in substantially absolute fluid isolation from said bearing cavity.
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;
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 primarily dynamic sealing surface and a primarily static sealing surface, wherein a first contact pressure occurs at said primarily dynamic sealing surface and a second contact pressure occurs at said primarily static sealing surface, said first contact pressure and said second contact pressure being unequal; and an annular space disposed between said annular primary seal and said annular secondary seal, said annular space at least partially containing fluid and in substantially absolute fluid isolation from said bearing cavity.
5. The drill bit of claim 4 wherein said first contact pressure is greater than said second contact pressure.
6. The drill bit of claim 4 wherein said second contact pressure is greater than said first contact pressure.
7. 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 annular primary seal and the borehole and between said leg and said roller cone, wherein said annular secondary seal is engageable with said leg and said roller cone, said annular secondary seal including a sealing surface engageable with one of said bit components, wherein said sealing surface includes first and second regions;
and wherein a first contact pressure occurs at said first region of said sealing surface and a second contact pressure occurs at said second region of said sealing surface, said first contact pressure being greater than said second contact pressure.
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 annular primary seal and the borehole and between said leg and said roller cone, wherein said annular secondary seal is engageable with said leg and said roller cone, said annular secondary seal including a sealing surface engageable with one of said bit components, wherein said sealing surface includes first and second regions;
and wherein a first contact pressure occurs at said first region of said sealing surface and a second contact pressure occurs at said second region of said sealing surface, said first contact pressure being greater than said second contact pressure.
8. The drill bit of claim 7 further including an annular space disposed between said annular primary seal and said annular secondary seal, said annular space at least partially containing fluid and in substantially absolute fluid isolation from said bearing cavity.
9. The drill bit of claim 8 wherein said fluid in said annular space is capable of migrating past said annular secondary seal from said annular space to the borehole.
10. The drill bit of claim 7 wherein said sealing surface is a primarily dynamic sealing surface.
11. The drill bit of claim 7 wherein said sealing surface is a primarily static sealing surface.
12. 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 a primarily dynamic sealing surface and a primarily static sealing surface, each of said primarily dynamic and static sealing surfaces engageable with one of said bit components, wherein at least a portion of at least one of said primarily dynamic and static sealing surfaces includes a non-elastomeric porous inlay capable of at least partially allowing the passage of fluid past said annular secondary seal when said portion of at least one of said sealing surfaces is engaged with said bit component.
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 a primarily dynamic sealing surface and a primarily static sealing surface, each of said primarily dynamic and static sealing surfaces engageable with one of said bit components, wherein at least a portion of at least one of said primarily dynamic and static sealing surfaces includes a non-elastomeric porous inlay capable of at least partially allowing the passage of fluid past said annular secondary seal when said portion of at least one of said sealing surfaces is engaged with said bit component.
13. The drill bit of claim 12 wherein said porous inlay is constructed at least partially of wire mesh.
14. The drill bit of claim 12 wherein said porous inlay is a screen.
15. The drill bit of claim 12 wherein said porous inlay is constructed at least partially of fabric.
16. The drill bit of claim 12 wherein said porous inlay is constructed at least partially of felt.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US08/982,081 US6033117A (en) | 1995-12-19 | 1997-12-01 | Sealed bearing drill bit with dual-seal configuration |
| US08/982,081 | 1997-12-01 | ||
| 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 |
|---|---|
| CA2585123A1 true CA2585123A1 (en) | 1999-06-01 |
| CA2585123C CA2585123C (en) | 2010-07-13 |
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 |
| CA2585123A Expired - Lifetime CA2585123C (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 |
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 |
|---|---|---|---|
| CA2585915A Expired - Lifetime CA2585915C (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 |
|---|---|---|---|---|
| US10954730B1 (en) | 2019-06-07 | 2021-03-23 | Qes Pressure Control Llc | Pressure control for gate-valve and hot-tap drilling systems |
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 |
| CN114320163B (en) * | 2022-03-14 | 2022-05-10 | 西南石油大学 | Sealing element for roller bit and roller bit |
-
1998
- 1998-12-01 CA CA2585249A patent/CA2585249C/en not_active Expired - Lifetime
- 1998-12-01 CA CA2585123A patent/CA2585123C/en not_active Expired - Lifetime
- 1998-12-01 CA CA2585915A patent/CA2585915C/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10954730B1 (en) | 2019-06-07 | 2021-03-23 | Qes Pressure Control Llc | Pressure control for gate-valve and hot-tap drilling systems |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2585123C (en) | 2010-07-13 |
| CA2585915A1 (en) | 1999-06-01 |
| CA2585249C (en) | 2010-06-15 |
| CA2585915C (en) | 2010-08-17 |
| CA2585249A1 (en) | 1999-06-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKEX | Expiry |
Effective date: 20181203 |