Patent DE361789C successfully refreshed from Google Patents.
US4245709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Removable drill string stabilizers
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1979-04-27
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Granted: 1981-01-20
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Expires: 1999-04-27
Abstract
Abstract A stabilizer sleeve, or other sleeve, to be releasably mounted on a drill collar for centering a drill string in a well bore, includes an outer stabilizer sleeve to be mounted on the cylindrical periphery of the drill collar and having an internally threaded bore, the threads of which have conical roots, receiving an externally threaded yieldable sleeve member placed over the drill collar, the crests of the external threads also being conical, rotation of the yieldable member threading it into the stabilizer sleeve and effecting its contraction until its internal surface contacts the periphery of the drill collar, further rotation and tightening of the sleeve member in the stabilizer sleeve compressing the sleeve member against the drill collar periphery, with the crests bearing against the root portions of the internal sleeve threads to secure the sleeve frictionally in position on the drill collar.
Inventors
- 👤 Tom Manuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:26
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1078; Y; Y10; Y10T; Y10T279/00; Y10T279/17; Y10T279/17128; Y10T279/17136; Y10T279/17153; Y10T279/17411; Y10T279/17487; Y10T279/17495; Y10T403/00; Y10T403/70; Y10T403/7047; Y10T403/7051; Y10T403/7052; Y10T403/7056; Y10T403/7058
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
153 words
Apparatus adapted to be mounted on a cylindrical exterior of a drill string member disposed in a bore hole, comprising a contractible inner sleeve having an internal cylindrical surface adapted to frictionally engage a cylindrical surface of the drill string member and an external thread having external conical crests of longitudinally extending length, an outer sleeve surrounding said inner sleeve having internal threads provided with conical roots of longitudinally extending length frictionally engaging said conical crests and having a surface of contact therewith, and means for relatively turning said inner sleeve with respect to said outer sleeve to thread said inner sleeve longitudinally along said outer sleeve with said conical crests slidably engaging said conical roots to contract said inner sleeve and compress said inner sleeve between said conical roots and the drill string member, with said cylindrical surface of said inner sleeve frictionally engaging the cylindrical surface of the drill string member.
Claim 2
Dependent Claim
153 words
Apparatus adapted to be mounted on a cylindrical exterior of a drill string member disposed in a bore hole, comprising a contractible inner sleeve having an internal cylindrical surface adapted to frictionally engage a cylindrical surface of the drill string member and an external thread having external conical crests of longitudinally extending length, an outer sleeve surrounding said inner sleeve having internal threads provided with conical roots of longitudinally extending length frictionally engaging said conical crests and having a surface of contact therewith, and means for relatively turning said inner sleeve with respect to said outer sleeve to thread said inner sleeve longitudinally along said outer sleeve with said conical crests slidably engaging said conical roots to contract said inner sleeve and compress said inner sleeve between said conical roots and the drill string member, with said cylindrical surface of said inner sleeve frictionally engaging the cylindrical surface of the drill string member.
Claim 3
Dependent Claim
31 words
Apparatus as defined in claim 1; said inner sleeve having a portion extending beyond one end of said outer sleeve to receive a tool for applying torque to said inner sleeve.
Claim 4
Dependent Claim
19 words
Apparatus as defined in claim 1; said inner sleeve having at least one longitudinal split extending throughout its length.
Claim 5
Dependent Claim
24 words
Apparatus as defined in claim 3; said inner sleeve having one or more longitudinal grooves therein to increase the flexibility of said inner sleeve.
Claim 6
Dependent Claim
173 words
Apparatus adapted to be mounted on a cylindrical exterior of a drill string member disposed in a bore hole, comprising a contractible inner sleeve having an internal cylindrical surface adapted to frictionally engage a cylindrical surface of the drill string member and an external thread having external conical crests, an outer sleeve surrounding said inner sleeve having internal threads provided with conical roots frictionally engaging said conical crests, and means for relatively turning said inner sleeve with respect to said outer sleeve to thread said inner sleeve longitudinally along said outer sleeve with said conical crests slidably engaging said conical roots to contract said inner sleeve and compress said inner sleeve between said conical roots and the drill string member, with said cylindrical surface of said inner sleeve frictionally engaging the cylindrical surface of the drill string member, said inner sleeve comprising a helical spring having a plurality of turns, the inner portion of said turns providing said internal cylindrical surface and the outer portion of said turns providing said external conical crests.
Claim 7
Dependent Claim
173 words
Apparatus adapted to be mounted on a cylindrical exterior of a drill string member disposed in a bore hole, comprising a contractible inner sleeve having an internal cylindrical surface adapted to frictionally engage a cylindrical surface of the drill string member and an external thread having external conical crests, an outer sleeve surrounding said inner sleeve having internal threads provided with conical roots frictionally engaging said conical crests, and means for relatively turning said inner sleeve with respect to said outer sleeve to thread said inner sleeve longitudinally along said outer sleeve with said conical crests slidably engaging said conical roots to contract said inner sleeve and compress said inner sleeve between said conical roots and the drill string member, with said cylindrical surface of said inner sleeve frictionally engaging the cylindrical surface of the drill string member, said inner sleeve comprising a helical spring having a plurality of turns, the inner portion of said turns providing said internal cylindrical surface and the outer portion of said turns providing said external conical crests.
Claim 8
Dependent Claim
24 words
Apparatus as defined in claims 1, 3, 4 or 2; said outer sleeve being a stabilizer engageable with the wall of a bore hole.
Claim 9
Dependent Claim
27 words
Apparatus as defined in claims 1, 3, 4 or 2; the angle of taper of said conical roots and crests ranging from about 0.286° to about 1.43°.
Claim 10
Dependent Claim
36 words
Apparatus as defined in claim 5; a collar secured to one end of said helical spring and extending beyond one end of said outer sleeve to receive a tool for applying torque to said inner sleeve.
Claim 11
Dependent Claim
22 words
Apparatus as defined in claims 5 or 8; said outer sleeve being a stabilizer engageable with the wall of a bore hole.
Claim 12
Dependent Claim
25 words
Apparatus as defined in claims 5 or 8; the angle of taper of said conical roots and crests ranging from about 0.286° to about 1.43°.
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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) | 1984-01-20 | 1984-07-21 | 1985-01-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-01-20 | 1988-07-21 | 1989-01-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-01-20 | 1992-07-21 | 1993-01-20 | $7700.00 | Window Closed / Lapsed |