US3427651A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well control
Assignee: ExxonMobil Upstream Research Co
•
Filing: 1966-11-23
•
Granted: 1969-02-11
•
Expires: 1986-11-23
Abstract
No abstract record available.
Inventors
- 👤 Walter J Bielstein
- 👤 Otto R Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:40
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/12; E21B33/127; E21B33/1272; E21B21/00; E21B21/10; E21B21/103
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
93 words
A METHOD FOR CONTROLLING FORMATION CONDITIONS IN A BOREHOLE HAVING A DRILL STRING WITH A FULLY OPEN BORE THERETHROUGH AND WITH A DRILL BIT ON THE LOWER END THEREOF POSITIONED THEREIN WHICH COMPRISES THE STEPS OF: SEALING OFF THE ANNULUS BETWEEN SAID DRILL STRING AND THE BOREHOLE WALL WHILE MAINTAINING SAID BORE THROUGH SAID DRILL STRING FULLY OPEN; OPENING A CIRCULATION PORT IN SAID DRILL STRING ABOVE SAID SEALED-OFF ANNULUS; AND CIRCULATING FLUID DOWN SAID DRILL STRING THROUGH SAID CIRCULATION PORT AND UP THE ANNULUS BETWEEN SAID DRILL STRING AND THE BOREHOLE WALL.
Claim 2
Independent Claim
93 words
A METHOD FOR CONTROLLING FORMATION CONDITIONS IN A BOREHOLE HAVING A DRILL STRING WITH A FULLY OPEN BORE THERETHROUGH AND WITH A DRILL BIT ON THE LOWER END THEREOF POSITIONED THEREIN WHICH COMPRISES THE STEPS OF: SEALING OFF THE ANNULUS BETWEEN SAID DRILL STRING AND THE BOREHOLE WALL WHILE MAINTAINING SAID BORE THROUGH SAID DRILL STRING FULLY OPEN; OPENING A CIRCULATION PORT IN SAID DRILL STRING ABOVE SAID SEALED-OFF ANNULUS; AND CIRCULATING FLUID DOWN SAID DRILL STRING THROUGH SAID CIRCULATION PORT AND UP THE ANNULUS BETWEEN SAID DRILL STRING AND THE BOREHOLE WALL.
References Cited (Backward Citations)
SU167198A1
Cited
US2082111A
Cited
US2637401A
Cited
US3044553A
Cited
US3151690A
Cited
US3236307A
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US3322215A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-02-11 | 1972-08-12 | 1973-02-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-02-11 | 1976-08-12 | 1977-02-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-02-11 | 1980-08-12 | 1981-02-11 | $7700.00 | Window Closed / Lapsed |