US3160218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well drilling assembly
Assignee: Shell USA Inc
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Filing: 1961-09-11
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Granted: 1964-12-08
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Expires: 1981-09-11
Abstract
No abstract record available.
Inventors
- 👤 Wilfred S Crake
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 14:42
CPC Classifications
E; E21; E21B; E21B7/00; E21B7/04; E21B7/10; E21B7/06; E21B7/067
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
128 words
APPARATUS TO MINIMIZE WELL DEVIATION DURING DRILLING A WELL COMPRISING A DRILL STRING ADAPTED TO BE POSITIONED IN A WELL, AT LEAST ONE THICK-WALL DRILL COLLAR SECURED TO THE LOWER END OF SAID DRILL STRING, AND A DRILL BIT SECURED TO THE LOWER END OF SAID DRILL COLLAR AND ROTATABLE WITH SAID COLLAR AND SAID DRILL STRING, A PORTION OF SAID DRILL COLLAR BEING FORMED WITH REDUCED WALL THICKNESS ONLY ON ONE SIDE THEREOF TO REDUCE THE SECTION MODULUS OF THE COLLAR DIRECTIONALLY, WHEREBY UNDER LOAD CONDITIONS THE AXIS OF THE DRILL COLLAR BELOW THE PORTION OF REDUCED SECTION MODULUS BECOMES LOCKED IN ONE DIRECTION AT AN ANGLE TO THE AXIS OF THE WELL WHEREBY THE ANGLE FORMED IN THE COLLAR SWEEPS AROUND THE WALL OF THE WELL.
Claim 2
Dependent Claim
128 words
APPARATUS TO MINIMIZE WELL DEVIATION DURING DRILLING A WELL COMPRISING A DRILL STRING ADAPTED TO BE POSITIONED IN A WELL, AT LEAST ONE THICK-WALL DRILL COLLAR SECURED TO THE LOWER END OF SAID DRILL STRING, AND A DRILL BIT SECURED TO THE LOWER END OF SAID DRILL COLLAR AND ROTATABLE WITH SAID COLLAR AND SAID DRILL STRING, A PORTION OF SAID DRILL COLLAR BEING FORMED WITH REDUCED WALL THICKNESS ONLY ON ONE SIDE THEREOF TO REDUCE THE SECTION MODULUS OF THE COLLAR DIRECTIONALLY, WHEREBY UNDER LOAD CONDITIONS THE AXIS OF THE DRILL COLLAR BELOW THE PORTION OF REDUCED SECTION MODULUS BECOMES LOCKED IN ONE DIRECTION AT AN ANGLE TO THE AXIS OF THE WELL WHEREBY THE ANGLE FORMED IN THE COLLAR SWEEPS AROUND THE WALL OF THE WELL.
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) | 1967-12-08 | 1968-06-08 | 1968-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-08 | 1972-06-08 | 1972-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-08 | 1976-06-08 | 1976-12-08 | $7700.00 | Window Closed / Lapsed |