US2560331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for preventing corrosion in wells
Assignee: Standard Oil Development Co
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Filing: 1948-07-30
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Granted: 1951-07-10
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Expires: 1968-07-30
Abstract
No abstract record available.
Inventors
- 👤 Rudolph C Buchan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 13:21
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02; Y; Y10; Y10S; Y10S166/00; Y10S166/902; Y10S507/00; Y10S507/939
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
162 words
A METHOD OF PREVENTING CORROSION OF EXPOSED FERROUS METALLIC SURFACES IN A WELL DRILLED IN THE EARTH IN CONTACT WITH CORROSIVE LIQUIDS FROM SUBSURFACE FORMATIONS PIERCED BY SAID WELL, WHICH COMPRISES FLOWING A CORROSIVE LIQUID IN A FERROUS METAL CONDUIT FROM A SUBSURFACE FORMATION PIERCED BY SAID WELL, SHUTTING OFF THE FLOW OF SAID CORROSIVE LIQUID IN SAID FERROUS METALLIC CONDUIT TO FORM A STATIC HEAD OF SAID LIQUID IN SAID CONDUIT, THEN INTRODUCING INTO SAID CONDUIT A CONCENTRATED AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE IN AN AMOUNT OF APPROXIMATELY 1 GALLON FOR APPROXIMATELY EVERY 167 TO 500 FEET OF SAID WELL AND SUFFICIENT TO FORM A COATING OF SILICATE ON THE EXPOSED SURFACES OF SAID CONDUIT, ALLOWING SAID SOLUTION TO REMAIN IN CONTACT WITH SAID EXPOSED SURFACES OF SAID CONDUIT FOR A PERIOD OF TIME IN THE RANGE FROM 30 MINUTES TO 10 HOURS THEREBY FORMING A SILICATE COATING THEREON, AND RESUMING FLOW OF SAID CORROSIVE LIQUIDS IN SAID CONDUIT.
Claim 2
Independent Claim
162 words
A METHOD OF PREVENTING CORROSION OF EXPOSED FERROUS METALLIC SURFACES IN A WELL DRILLED IN THE EARTH IN CONTACT WITH CORROSIVE LIQUIDS FROM SUBSURFACE FORMATIONS PIERCED BY SAID WELL, WHICH COMPRISES FLOWING A CORROSIVE LIQUID IN A FERROUS METAL CONDUIT FROM A SUBSURFACE FORMATION PIERCED BY SAID WELL, SHUTTING OFF THE FLOW OF SAID CORROSIVE LIQUID IN SAID FERROUS METALLIC CONDUIT TO FORM A STATIC HEAD OF SAID LIQUID IN SAID CONDUIT, THEN INTRODUCING INTO SAID CONDUIT A CONCENTRATED AQUEOUS SOLUTION OF AN ALKALI METAL SILICATE IN AN AMOUNT OF APPROXIMATELY 1 GALLON FOR APPROXIMATELY EVERY 167 TO 500 FEET OF SAID WELL AND SUFFICIENT TO FORM A COATING OF SILICATE ON THE EXPOSED SURFACES OF SAID CONDUIT, ALLOWING SAID SOLUTION TO REMAIN IN CONTACT WITH SAID EXPOSED SURFACES OF SAID CONDUIT FOR A PERIOD OF TIME IN THE RANGE FROM 30 MINUTES TO 10 HOURS THEREBY FORMING A SILICATE COATING THEREON, AND RESUMING FLOW OF SAID CORROSIVE LIQUIDS IN SAID CONDUIT.
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) | 1954-07-09 | 1955-01-08 | 1955-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-07-09 | 1959-01-08 | 1959-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-07-09 | 1963-01-08 | 1963-07-10 | $7700.00 | Window Closed / Lapsed |