Patent US4284154A successfully refreshed from Google Patents.
US4284154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-rotating spring loaded stabilizer
Assignee: Vale Canada Ltd
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Filing: 1979-11-19
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Granted: 1981-08-18
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Expires: 1999-11-19
Abstract
Abstract There is provided a non-rotating, self-centering stabilizer (10). The stabilizer (10) includes a cylindrical sleeve (12) disposed about a rotating mandrel (34). A plurality of wear-resistant pads (18A, 18B and 18C) partially extend from a similar number of longitudinal channels (14A, 14B and 14C) to form a stabilizing relationship with the wall of a hole being drilled.
Inventors
- 👤 John R. England
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:47
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
135 words
A self-centering, stabilizing apparatus comprising a fixed, non-rotating cylindrical sleeve, a mandrel rotatably disposed within the sleeve and detachably affixed therein, the sleeve having a longitudinal axis of symmetry, a plurality of bearing means disposed between the sleeve and the mandrel, a plurality of spaced, wear-resistant pads detachably affixed to the periphery of the sleeve, the pads oriented within a plurality of longitudinal channels formed along the peripheral surface of the sleeve, a plurality of alignment guides disposed within the channels and in slideable registry with the pads, a retainer projecting outwardly from each channel into a cavity formed within each pad, a spring washer disposed within each channel, the washer being oriented about the retainer, so as to allow the pads limited movement in a plane substantially perpendicular to the axis of the sleeve.
Claim 2
Dependent Claim
135 words
A self-centering, stabilizing apparatus comprising a fixed, non-rotating cylindrical sleeve, a mandrel rotatably disposed within the sleeve and detachably affixed therein, the sleeve having a longitudinal axis of symmetry, a plurality of bearing means disposed between the sleeve and the mandrel, a plurality of spaced, wear-resistant pads detachably affixed to the periphery of the sleeve, the pads oriented within a plurality of longitudinal channels formed along the peripheral surface of the sleeve, a plurality of alignment guides disposed within the channels and in slideable registry with the pads, a retainer projecting outwardly from each channel into a cavity formed within each pad, a spring washer disposed within each channel, the washer being oriented about the retainer, so as to allow the pads limited movement in a plane substantially perpendicular to the axis of the sleeve.
Claim 3
Dependent Claim
18 words
The combination according to claim 1 wherein at least one of the bearing means is a segmented bushing.
Claim 4
Dependent Claim
13 words
The combination according to claim 2 wherein the bushing is made from bronze.
Claim 5
Dependent Claim
34 words
The combination according to claim 1 wherein a plurality of grease seals are disposed about the mandrel and towards the ends of the sleeve to prevent the loss of grease from the bearing means.
Claim 6
Dependent Claim
24 words
The combination according to claim 1 wherein a plurality of grease fittings, disposed within the troughs, are in flow communication with the bearing means.
Claim 7
Dependent Claim
25 words
The combination according to claim 1 wherein a plurality of longitudinal troughs are formed within the peripheral surface of the sleeve and between the pads.
Claim 8
Independent Claim
167 words
A system for stabilizing a drill string and the like in a hole, the system comprising a mandrel and at least two self-centering, non-rotating stabilizers, the stabilizers including a fixed non-rotatable cylindrical sleeve, the mandrel rotatably disposed within the sleeve and detachably affixed therein, the sleeve having a longitudinal axis of symmetry, a plurality of bearing means disposed between the sleeve and the mandrel, a plurality of spaced wear-resistant pads detachably affixed to the periphery of the sleeve, the pads oriented within a plurality of longitudinal channels formed along the peripheral surface of the sleeve, a plurality of alignment guides disposed within the channels and in slideable registry with the pads, a retainer projecting outwardly from each channel into a cavity formed within each pad, a spring washer disposed within each channel, the washer being oriented about a retainer so as to allow the pads limited movement in a plane substantially perpendicular to the axis of the sleeve, and the stabilizers arranged in a stacked, coaxial arrangement.
Claim 9
Independent Claim
167 words
A system for stabilizing a drill string and the like in a hole, the system comprising a mandrel and at least two self-centering, non-rotating stabilizers, the stabilizers including a fixed non-rotatable cylindrical sleeve, the mandrel rotatably disposed within the sleeve and detachably affixed therein, the sleeve having a longitudinal axis of symmetry, a plurality of bearing means disposed between the sleeve and the mandrel, a plurality of spaced wear-resistant pads detachably affixed to the periphery of the sleeve, the pads oriented within a plurality of longitudinal channels formed along the peripheral surface of the sleeve, a plurality of alignment guides disposed within the channels and in slideable registry with the pads, a retainer projecting outwardly from each channel into a cavity formed within each pad, a spring washer disposed within each channel, the washer being oriented about a retainer so as to allow the pads limited movement in a plane substantially perpendicular to the axis of the sleeve, and the stabilizers arranged in a stacked, coaxial arrangement.
Claim 10
Dependent Claim
16 words
The system according to claim 7 wherein a rotatable extension member is disposed between the stabilizers.
Claim 11
Dependent Claim
20 words
The system according to claim 7 wherein an earth-rock cutting tool is disposed at one end of the drill string.
Claim 12
Dependent Claim
27 words
The system according to claim 7 wherein a stabilizer includes a plurality of longitudinal troughs formed within the peripheral surface of the sleeve and between the pads.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-17 | 1985-02-16 | 1985-08-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-17 | 1989-02-16 | 1989-08-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-17 | 1993-02-16 | 1993-08-18 | $7700.00 | Window Closed / Lapsed |