US3223185A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of drilling in permeable formations
Assignee: Shell USA Inc
•
Filing: 1961-12-07
•
Granted: 1965-12-14
•
Expires: 1981-12-07
Abstract
No abstract record available.
Inventors
- 👤 Jongbloed Lodewijk Joha Schmit
- 👤 Nicolaas Henk Van Lingen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/32; C09K8/34; C09K8/04; C09K8/14; C09K8/18; C09K8/22; E; E21; E21B; E21B21/00; E21B21/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
155 words
A METHOD OF DRILLING WELLS FORMED BY A DRILL BIT AT THE LOWER END OF A DRILL STRING WHILE EMPLOYING A DRILLING FLUID, SAID METHOD COMPRISES (A) ROTATING SAID DRILL STRING WITH THE DRILL BIT BEARING AGAINST THE FACE OF THE FORMATION BEING DRILLED, (B) PUMPING A DRILLING FLUID DOWN THE DRILL STRING, (C) DISCHARGING THE DRILLING FLUID THROUGH THE BIT AT THE BOTTOM OF THE ROTATING DRILL STRING AND AGAINST THE BOTTOM OF THE WELL, (D) CIRCULATING THE DRILLING FLUID UP THE WELL OUTSIDE THE ROTATING DRILL STRING AT A RATE SUFFICIENT TO MAINTAIN THE FACE OF PERMEABLE FORMATIONS TRAVERSED BY THE BIT IN A FLUID-PERMEABLE CONDITION, AND (E) SUBSTANTIALLY REDUCING THE PERMEABILITY OF SAID FORMATION AT A POINT IN THE FORMATION AT LEAST SUBSTANTIALLY AT CHIP DEPTH, THEREBY MAINTAINING A PRESSUREDROP AT SAID POINT TO REDUCE THE HOLD-DOWN FORCE OF THE CIRCULATING COLUMN OF FLUID EXERTED AGAINST CHIPS BEING FORMED BY THE BIT.
Claim 2
Independent Claim
155 words
A METHOD OF DRILLING WELLS FORMED BY A DRILL BIT AT THE LOWER END OF A DRILL STRING WHILE EMPLOYING A DRILLING FLUID, SAID METHOD COMPRISES (A) ROTATING SAID DRILL STRING WITH THE DRILL BIT BEARING AGAINST THE FACE OF THE FORMATION BEING DRILLED, (B) PUMPING A DRILLING FLUID DOWN THE DRILL STRING, (C) DISCHARGING THE DRILLING FLUID THROUGH THE BIT AT THE BOTTOM OF THE ROTATING DRILL STRING AND AGAINST THE BOTTOM OF THE WELL, (D) CIRCULATING THE DRILLING FLUID UP THE WELL OUTSIDE THE ROTATING DRILL STRING AT A RATE SUFFICIENT TO MAINTAIN THE FACE OF PERMEABLE FORMATIONS TRAVERSED BY THE BIT IN A FLUID-PERMEABLE CONDITION, AND (E) SUBSTANTIALLY REDUCING THE PERMEABILITY OF SAID FORMATION AT A POINT IN THE FORMATION AT LEAST SUBSTANTIALLY AT CHIP DEPTH, THEREBY MAINTAINING A PRESSUREDROP AT SAID POINT TO REDUCE THE HOLD-DOWN FORCE OF THE CIRCULATING COLUMN OF FLUID EXERTED AGAINST CHIPS BEING FORMED BY THE BIT.
References Cited (Backward Citations)
US1421706A
Cited
US2156219A
Cited
US2801218A
Cited
US2801699A
Cited
US2867278A
Cited
US3040821A
Cited
US2896716A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |