US3670832A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Slim hole drilling method
Assignee: Atlantic Richfield Co
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Filing: 1970-08-19
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Granted: 1972-06-20
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Expires: 1990-08-19
Abstract
Abstract A slim hole drilling method wherein a wellbore of a diameter no greater than about 6 inches is drilled using a drill pipe rotation rate of at least 500 rpm and rotating the drill pipe with at least one electric motor operably connected to the drill pipe. Drilling power units for carrying out the drilling method which employ at least one electric motor in mechanical connection with the drill pipe for rotating the drill pipe and moving with same as it advances toward and away from the wellbore.
Inventors
- 👤 John H Striegler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:02
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
107 words
A slim hole drilling method comprising rotary drilling a wellbore having a diameter no greater than about 6 inches, rotating the drill pipe during at least part of the drilling at a rate of at least 500 rpm, rotating said drill pipe with at least one shunt type direct current electric motor operably connected to said drill pipe, limiting the torque output of said at least one direct current motor by decreasing the armature current when a maximum desired torque output of the motor is reached, and moving said at least one electric motor with said drill pipe as said drill pipe moves relative to said wellbore.
Claim 2
Dependent Claim
107 words
A slim hole drilling method comprising rotary drilling a wellbore having a diameter no greater than about 6 inches, rotating the drill pipe during at least part of the drilling at a rate of at least 500 rpm, rotating said drill pipe with at least one shunt type direct current electric motor operably connected to said drill pipe, limiting the torque output of said at least one direct current motor by decreasing the armature current when a maximum desired torque output of the motor is reached, and moving said at least one electric motor with said drill pipe as said drill pipe moves relative to said wellbore.
Claim 3
Dependent Claim
28 words
A method according to claim 1 wherein said wellbore diameter is from about 2 to 5 inches and said rotation rate is from about 600 to 2,000 rpm.
Claim 4
Dependent Claim
25 words
A method according to claim 1 wherein the rotational speed of said at least one direct current motor is controlled by varying the armature voltage.
Claim 5
Dependent Claim
32 words
A method according to claim 1 wherein the direction of rotation of said at least one direct current motor is controlled by reversing the current through the shunt field of said motor.
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) | 1975-06-20 | 1975-12-20 | 1976-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-20 | 1979-12-20 | 1980-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-20 | 1983-12-20 | 1984-06-20 | $7700.00 | Window Closed / Lapsed |