US5289889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Roller cone core bit with spiral stabilizers
Assignee: General Electric Co
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Filing: 1993-01-21
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Granted: 1994-03-01
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Expires: 2013-01-21
Abstract
Abstract This invention relates to an improved roller cone coring bit that includes spiral stabilizer blades on the bit body. The spiral stabilizer blades reduce the whirling tendency of the bit, thereby enhancing the ability to cut and recover a continuous core.
Inventors
- 👤 Marvin Gearhart
- 👤 Johnny N. Castle
- 👤 Paul G. Parys
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:06
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1092; E21B10/00; E21B10/02; E21B10/06; E21B10/46; E21B10/50; E21B17/22
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
85 words
An improved roller cone core bit comprising: a cylindrical bit body having a means for connecting the core bit to a drillstring on one end and a plurality of journal segment arms on the other end; a plurality of core cutters, the cone cutters being rotatably mounted on journals which extend downward from the journal segment arms; and a plurality of stabilizer blades fixedly attached to the circumference of the bit body, each stabilizer blade oriented spirally about the longitudinal axis of the bit body.
Claim 2
Dependent Claim
85 words
An improved roller cone core bit comprising: a cylindrical bit body having a means for connecting the core bit to a drillstring on one end and a plurality of journal segment arms on the other end; a plurality of core cutters, the cone cutters being rotatably mounted on journals which extend downward from the journal segment arms; and a plurality of stabilizer blades fixedly attached to the circumference of the bit body, each stabilizer blade oriented spirally about the longitudinal axis of the bit body.
Claim 3
Dependent Claim
17 words
The improved roller cone core bit of claim 1 wherein the stabilizer blades contain tungsten carbide inserts.
Claim 4
Dependent Claim
19 words
The improved roller cone core bit of claim 1 wherein the stabilizer blades have hardfacing on their leading edge.
Claim 5
Dependent Claim
22 words
The improved roller cone core bit of claim 1 wherein the stabilizer blades extend to substantially the diameter of the core bit.
Claim 6
Dependent Claim
25 words
The improved roller cone core bit of claim 1 wherein the stabilizer blades provide substantially 360 degrees of wall contact with a full gage borehole.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-02-28 | 1997-08-30 | 1998-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-02-28 | 2001-08-30 | 2002-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-02-28 | 2005-08-30 | 2006-03-01 | $7700.00 | Window Closed / Lapsed |