US4610307A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for selectively straight or directional drilling in subsurface rock formation
Assignee: Baker Hughes Oilfield Operations LLC
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Filing: 1985-12-18
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Granted: 1986-09-09
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Expires: 2005-12-18
Abstract
Abstract A device for use in underground drilling comprising: a tubular housing, a down-hole motor mounted within the housing and having an output shaft, means for connecting said output shaft to a drill bit, means for connecting said housing to a drill string, first and second stabilizers mounted on said housing, said first stabilizer being mounted nearer than the second stabilizer to the output shaft connecting means, at least one of said stabilizers being an eccentric stabilizer, and at least one stress relieving means between the first stabilizer and the means for connecting the housing to the drill string.
Inventors
- 👤 Rainer Jurgens
- 👤 Volker Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:57
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/20; E21B7/00; E21B7/04; E21B7/06; E21B7/068; E21B7/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
187 words
A device for use in underground drilling comprising: a tubular housing, comprised of a plurality of connected sections of substantially the same diameter, a down-hole motor mounted within the housing and having an output shaft rotatably supported in a lower section of the housing, means for connecting said output shaft to a drill bit, means for connecting an upper end of said housing to a drill string, first and second stabilisers mounted adjacent to and spaced from each other on said housing, said first stabiliser being mounted on a lower section of the housing and nearer than the second stabiliser to the output shaft connecting means, and at least one stress relieving means provided on said housing above the first stabiliser and below the means for connecting the upper end of said housing to the drill string; each of said stress relieving means comprising a relatively flexible section of said housing adapted to bend and permit during drilling an angular relationship and connection between adjacent sections of the housing, and said first stabiliser being concentric with the housing and said second stabiliser being eccentric with the housing.
Claim 2
Independent Claim
187 words
A device for use in underground drilling comprising: a tubular housing, comprised of a plurality of connected sections of substantially the same diameter, a down-hole motor mounted within the housing and having an output shaft rotatably supported in a lower section of the housing, means for connecting said output shaft to a drill bit, means for connecting an upper end of said housing to a drill string, first and second stabilisers mounted adjacent to and spaced from each other on said housing, said first stabiliser being mounted on a lower section of the housing and nearer than the second stabiliser to the output shaft connecting means, and at least one stress relieving means provided on said housing above the first stabiliser and below the means for connecting the upper end of said housing to the drill string; each of said stress relieving means comprising a relatively flexible section of said housing adapted to bend and permit during drilling an angular relationship and connection between adjacent sections of the housing, and said first stabiliser being concentric with the housing and said second stabiliser being eccentric with the housing.
Claim 3
Dependent Claim
24 words
A device according to claim 1 in which the stress relieving means is situate between the second stbiliser and the drill string connecting means.
Claim 4
Dependent Claim
45 words
A device according to claim 1 including at least two stress relieving means, comprising a first stress relieving means being situate between the concentric and eccentric stabilisers and a second stress relieving means being situate between the eccentric stabiliser and the drill string connecting means.
Claim 5
Dependent Claim
33 words
A device according to claim 3 comprising a further third concentric stabiliser situate above the second eccentric stabiliser and in which a third stress relieving means is situate above the second eccentric stabiliser.
Claim 6
Dependent Claim
29 words
A device according to claim 1 which further comprises an angular connection of at least one stabiliser between and connecting adjacent sections of said housing together at an angle.
Claim 7
Dependent Claim
21 words
A device according to claim 1 in which at least one stabiliser is provided with at least one radially extending rib.
References Cited (Backward Citations)
US2829864A
Cited
US3135103A
Cited
US3563323A
Cited
US3730286A
Cited
US4319649A
Cited
US3938853A
Cited
US4465147A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-09-08 | 1990-03-10 | 1990-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-09-08 | 1994-03-10 | 1994-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-09-08 | 1998-03-10 | 1998-09-09 | $7700.00 | Window Closed / Lapsed |