US3189088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Well treating method
Assignee: Dow Chemical Co
•
Filing: 1961-02-10
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Granted: 1965-06-15
•
Expires: 1981-02-10
Abstract
No abstract record available.
Inventors
- 👤 Luther C Cronberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 08:37
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
A METHOD OF REDUCING THE SETTING TIME OF AN ELONGATED UN-SET ELCTRICALLY CONDUCTIVE SHEATH IN THE ANNULUS BETWEEN THE WELL OF AN EARTH WELL AND A STRING OF CASING DISPOSED IN SAID WELL, SAID SHEATH EXTENDING ALONG AT LEAST A SUBSTANTIALLY PART OF THE LENGTH OF SAID CASING, SAID STRING OF CASING CONSTITUTING AN ELECTRODE, COMPRISING ELECTRICALLY CONNECTING A SOURCE OF ELECTRICAL ENERGY BETWEEN SAID CASING ELECTRODE AND A GROUND ELECTRODE WHICH IS REMOTE FROM SAID SHEATH AND IS CONTACTING AN EARTH FORMATION, AND APPLYING IN EXCESS OF ONE HALF AMPERE OF ELECTRICAL CURRENT PER FOOT OF ACTIVE LENGTH OF SAID CASING ELECTRODE BETWEEN SAID CASING AND SAID REMOTE ELECTRODE TO HEAT THE SHEATH AND ACCELERATE THE SETTING THEREOF.
Claim 2
Independent Claim
119 words
A METHOD OF REDUCING THE SETTING TIME OF AN ELONGATED UN-SET ELCTRICALLY CONDUCTIVE SHEATH IN THE ANNULUS BETWEEN THE WELL OF AN EARTH WELL AND A STRING OF CASING DISPOSED IN SAID WELL, SAID SHEATH EXTENDING ALONG AT LEAST A SUBSTANTIALLY PART OF THE LENGTH OF SAID CASING, SAID STRING OF CASING CONSTITUTING AN ELECTRODE, COMPRISING ELECTRICALLY CONNECTING A SOURCE OF ELECTRICAL ENERGY BETWEEN SAID CASING ELECTRODE AND A GROUND ELECTRODE WHICH IS REMOTE FROM SAID SHEATH AND IS CONTACTING AN EARTH FORMATION, AND APPLYING IN EXCESS OF ONE HALF AMPERE OF ELECTRICAL CURRENT PER FOOT OF ACTIVE LENGTH OF SAID CASING ELECTRODE BETWEEN SAID CASING AND SAID REMOTE ELECTRODE TO HEAT THE SHEATH AND ACCELERATE THE SETTING THEREOF.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-06-14 | 1968-12-14 | 1969-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-06-14 | 1972-12-14 | 1973-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-06-14 | 1976-12-14 | 1977-06-15 | $7700.00 | Window Closed / Lapsed |