US3211221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for fracturing an underground formation
Assignee: Gulf Research and Development Co
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Filing: 1962-06-14
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Granted: 1965-10-12
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Expires: 1982-06-14
Abstract
No abstract record available.
Inventors
- 👤 Jimmie L Huitt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 16:51
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25; E21B43/26
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
156 words
A PROCESS FOR CREATING A SUBSTANTIALLY HORIZONTAL FRACTURE AT A DESIRED DEPTH IN A SUBTERRANEAN FORMATION PENETRATED BY THE BOREHOLE OF A WELL CONTAINING A LIQUID UNDER PRESSURE AT THE DESIRED DEPT, COMPRISING MOVING A CUTTING TOOL HAVING A RELATIVELY SHARP POINT AT ITS OUTER EDGE RADIALLY OUTWARDLY AT THE LOCATION OF THE DESIRED FRACTURE SIMULTANEOUSLY WITH ROTATING SAID TOOL ABOUT A VERTICAL AXIS TO MOVE SAID EDGE IN A HORIZONTAL PLANE TO CUT IN THE FORMATION A CONTINUOUS HORIZONTAL CIRCUMFERENTIAL V-SHAPED NOTCH HAVING A DIAMETER AT ITS APEX AT LEAST ABOUT TWICE AS GREAT AS THAT OF THE BOREHOLE AND A DEPTH OF PENETRATION AT LEAST ABOUT 1.3 TIMES ITS WIDTH AT THE SURFACE OF THE BOREHOLE, CIRCULATING A LIQUID IN THE WELL WHILE CUTTING THE NOTCH WHEREBY PRESSURE IS MAINTAINED AT THE NOTCH AND THEN INJECTING INTO SAID BOREHOLE A FLUID UNDER PRESSURE SUFFICIENT TO FRACTURE THE FORMATION AT THE LOCATION OF SAID NOTCH.
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) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |