CA2397335A1 - Bearing assembly for mud motor - Google Patents
Bearing assembly for mud motor Download PDFInfo
- Publication number
- CA2397335A1 CA2397335A1 CA 2397335 CA2397335A CA2397335A1 CA 2397335 A1 CA2397335 A1 CA 2397335A1 CA 2397335 CA2397335 CA 2397335 CA 2397335 A CA2397335 A CA 2397335A CA 2397335 A1 CA2397335 A1 CA 2397335A1
- Authority
- CA
- Canada
- Prior art keywords
- deployed
- housing
- mandrel
- bearing
- sealing ring
- 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 14
- 238000007789 sealing Methods 0.000 claims abstract 14
- 238000005553 drilling Methods 0.000 claims abstract 7
- 239000000969 carrier Substances 0.000 claims abstract 3
- 230000036316 preload Effects 0.000 claims 5
- 125000006850 spacer group Chemical group 0.000 claims 1
- 238000012423 maintenance Methods 0.000 abstract 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/003—Bearing, sealing, lubricating details
-
- 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
- E21B4/00—Drives for drilling, used in the borehole
- E21B4/02—Fluid rotary type drives
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)
- Rolling Contact Bearings (AREA)
- Magnetic Bearings And Hydrostatic Bearings (AREA)
Abstract
A bearing assembly for a mud motor is provided. The bearing assembly includes a mandrel deployed substantially coaxially in a bearing housing, first and second oil filled chambers between the housing and the mandrel, first and second bearing stacks deployed about the mandrel in the second oil filled chamber, and first, second, and third sealing ring carriers. The first sealing ring carrier is deployed between the first and second oil filled chambers, the second sealing ring carrier is deployed between the first oil filled chamber and drilling fluid interior to the housing, and the third sealing ring carrier is deployed between the second oil filled chamber and drilling fluid exterior to the housing. Embodiments of this invention advantageously improve axial and radial load bearing performance and reduce maintenance requirements due to an improved sealing arrangement.
Claims (7)
1. A bearing assembly for a mud motor, the bearing assembly comprising:
a housing having a cylindrical axis;
a mandrel, an upper end of which is deployed substantially coaxially in the housing and disposed to rotate about the cylindrical axis relative to the housing;
first and second chambers between the housing and the upper end of the mandrel, the chambers disposed to be filled with oil, the chambers further disposed such that, when the chambers are filled with oil, a fluid pressure of oil in the first chamber is greater than a fluid pressure of oil in the second chamber;
first and second bearing stacks deployed about the upper end of the mandrel in the second chamber;
first, second, and third sealing ring carriers, the first sealing ring carrier being deployed between the first and second chambers, the second sealing ring carrier being deployed between the first chamber and drilling fluid interior to the housing, and the third sealing ring carrier being deployed between the second chamber and drilling fluid exterior to the housing.
a housing having a cylindrical axis;
a mandrel, an upper end of which is deployed substantially coaxially in the housing and disposed to rotate about the cylindrical axis relative to the housing;
first and second chambers between the housing and the upper end of the mandrel, the chambers disposed to be filled with oil, the chambers further disposed such that, when the chambers are filled with oil, a fluid pressure of oil in the first chamber is greater than a fluid pressure of oil in the second chamber;
first and second bearing stacks deployed about the upper end of the mandrel in the second chamber;
first, second, and third sealing ring carriers, the first sealing ring carrier being deployed between the first and second chambers, the second sealing ring carrier being deployed between the first chamber and drilling fluid interior to the housing, and the third sealing ring carrier being deployed between the second chamber and drilling fluid exterior to the housing.
2. The bearing assembly of claim 1, wherein:
a lower end of the mandrel includes a threaded box end suitable for receiving a threaded pin end of a drill bit;
the third sealing ring carrier is deployed proximate to the lower end of the mandrel;
the second sealing ring carrier is deployed distal from the lower end of the mandrel; and the bearing assembly further includes a support ring deployed in the second chamber between the third sealing ring carrier and the first bearing stack, the support ring being disposed to support radial loads on the lower end of the mandrel.
a lower end of the mandrel includes a threaded box end suitable for receiving a threaded pin end of a drill bit;
the third sealing ring carrier is deployed proximate to the lower end of the mandrel;
the second sealing ring carrier is deployed distal from the lower end of the mandrel; and the bearing assembly further includes a support ring deployed in the second chamber between the third sealing ring carrier and the first bearing stack, the support ring being disposed to support radial loads on the lower end of the mandrel.
3. The bearing assembly of claim 1, wherein the second sealing ring carrier is configured to displace along the longitudinal axis to substantially balance fluid pressure between drilling fluid interior to the housing and oil in the first chamber.
4. The bearing assembly of claim 1, wherein:
a fluid pressure of oil in the first chamber is substantially equal to a fluid pressure of drilling fluid interior to the housing; and
a fluid pressure of oil in the first chamber is substantially equal to a fluid pressure of drilling fluid interior to the housing; and
5 a fluid pressure of oil in the second chamber is substantially equal to a fluid pressure of drilling fluid exterior to the housing.
5. The bearing assembly of claim 1, wherein each of the first and second bearing stacks includes at least one tapered bearing.
5. The bearing assembly of claim 1, wherein each of the first and second bearing stacks includes at least one tapered bearing.
6. The bearing assembly of claim 1, wherein:
the first bearing stack is deployed between a shoulder on an exterior surface of the upper end of the mandrel and a first shoulder on an interior surface of the housing, the first bearing stack being disposed to support an axial force urging the upper end of the mandrel deeper into the housing; and the second bearing stack is deployed between a second shoulder on the interior surface of the housing and a preload sleeve deployed about the upper end of the mandrel in the second chamber, the second bearing stack being disposed to support an axial force urging the upper end of the mandrel out of the housing.
the first bearing stack is deployed between a shoulder on an exterior surface of the upper end of the mandrel and a first shoulder on an interior surface of the housing, the first bearing stack being disposed to support an axial force urging the upper end of the mandrel deeper into the housing; and the second bearing stack is deployed between a second shoulder on the interior surface of the housing and a preload sleeve deployed about the upper end of the mandrel in the second chamber, the second bearing stack being disposed to support an axial force urging the upper end of the mandrel out of the housing.
7. The bearing assembly of claim l, further comprising:
a spring pack and a preload spacer deployed between the first and second bearing stacks; and a preload sleeve and a seal sleeve deployed about the upper end of the mandrel and between the second bearing stack and a preload nut, the first and second sealing ring carriers being deployed about the seal sleeve, the preload nut being deployed distal from a lower end of the mandrel.
a spring pack and a preload spacer deployed between the first and second bearing stacks; and a preload sleeve and a seal sleeve deployed about the upper end of the mandrel and between the second bearing stack and a preload nut, the first and second sealing ring carriers being deployed about the seal sleeve, the preload nut being deployed distal from a lower end of the mandrel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2397335 CA2397335C (en) | 2002-08-09 | 2002-08-09 | Bearing assembly for mud motor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2397335 CA2397335C (en) | 2002-08-09 | 2002-08-09 | Bearing assembly for mud motor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2397335A1 true CA2397335A1 (en) | 2004-02-09 |
| CA2397335C CA2397335C (en) | 2010-01-19 |
Family
ID=31501592
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2397335 Expired - Fee Related CA2397335C (en) | 2002-08-09 | 2002-08-09 | Bearing assembly for mud motor |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2397335C (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10145413B2 (en) * | 2016-07-27 | 2018-12-04 | Jtekt Corporation | Combination bearing |
-
2002
- 2002-08-09 CA CA 2397335 patent/CA2397335C/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10145413B2 (en) * | 2016-07-27 | 2018-12-04 | Jtekt Corporation | Combination bearing |
Also Published As
| Publication number | Publication date |
|---|---|
| CA2397335C (en) | 2010-01-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20190809 |