US2846385A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Prevention of corrosion in wells
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1954-10-11
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Granted: 1958-08-05
•
Expires: 1974-10-11
Abstract
No abstract record available.
Inventors
- 👤 Rudolph C Buchan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:13
CPC Classifications
E; E21; E21B; E21B41/00; E21B41/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
210 words
A METHOD FOR PROTECTING A PORTION OF A STEEL WELL CASING ADJACENT A HYDROCARBON PRODUCING FORMATION FROM CORROSION BY A STAGNANT BODY OF CORROSIVE FLUIDS ACCUMULATED IN SAID PORTION OF SAID CASING BY PRODUCTION FROM SAID FORMATION INTO SAID CASING, SAID CASING HAVING A TUBING ARRANGED THEREIN WITH THE LOWER END OF SAID TUBING ABOVE SAID STAGNANT BODY OF CORROSIVE FLUIDS IN SAID PORTION OF SAID CASING, WHICH METHOD COMPRISES THE STEPS OF METALLICALLY, ANNULARLY INTERCONNECTING SAID TUBING WITH SAID CASING ADJACENT SAID LOWER END OF SAID TUBING TO THEREBY ESTABLISH AN ELECTRICAL INTERCONNECTION BETWEEN SAID CASING AND SAID TUBING ADJACENT SAID LOWER END OF SAID TUBING, LOWERING A RETRIEVABLE SACRIFICIAL METAL TUBULAR MEMBER SMALLER IN DIAMETER THAN SAID TUBING THROUGH SAID TUBING UNTIL SAID TUBULAR MEMBER PROJECTS A SUBSTANTIAL DISTANCE FROM THE LOWER END OF SAID TUBING AND EXTENDS TO SAID PORTION OF SAID CASING CONTAINING SAID CORROSIVE WELL FLUIDS, SAID SACRIFICIAL METAL BEING ANODIC TO STEEL, WHEREBY A GALVANIC ACTION IS ESTABLISHED IN SAID PORTION OF SAID CASING ADJACENT SAID PRODUCING FORMATION, AND MAINTAINING SAID TUBULAR MEMBER IN SAID TUBING AND CASING WHILE SAID CORROSIVE FLUIDS ARE PRODUCED, WHEREBY SAID PORTION OF SAID CASING IS PROTECTED FROM CORROSION BY SAID CORROSIVE FLUIDS AND SAID SACRIFICIAL MEMBER IS CORRODED.
Claim 2
Independent Claim
210 words
A METHOD FOR PROTECTING A PORTION OF A STEEL WELL CASING ADJACENT A HYDROCARBON PRODUCING FORMATION FROM CORROSION BY A STAGNANT BODY OF CORROSIVE FLUIDS ACCUMULATED IN SAID PORTION OF SAID CASING BY PRODUCTION FROM SAID FORMATION INTO SAID CASING, SAID CASING HAVING A TUBING ARRANGED THEREIN WITH THE LOWER END OF SAID TUBING ABOVE SAID STAGNANT BODY OF CORROSIVE FLUIDS IN SAID PORTION OF SAID CASING, WHICH METHOD COMPRISES THE STEPS OF METALLICALLY, ANNULARLY INTERCONNECTING SAID TUBING WITH SAID CASING ADJACENT SAID LOWER END OF SAID TUBING TO THEREBY ESTABLISH AN ELECTRICAL INTERCONNECTION BETWEEN SAID CASING AND SAID TUBING ADJACENT SAID LOWER END OF SAID TUBING, LOWERING A RETRIEVABLE SACRIFICIAL METAL TUBULAR MEMBER SMALLER IN DIAMETER THAN SAID TUBING THROUGH SAID TUBING UNTIL SAID TUBULAR MEMBER PROJECTS A SUBSTANTIAL DISTANCE FROM THE LOWER END OF SAID TUBING AND EXTENDS TO SAID PORTION OF SAID CASING CONTAINING SAID CORROSIVE WELL FLUIDS, SAID SACRIFICIAL METAL BEING ANODIC TO STEEL, WHEREBY A GALVANIC ACTION IS ESTABLISHED IN SAID PORTION OF SAID CASING ADJACENT SAID PRODUCING FORMATION, AND MAINTAINING SAID TUBULAR MEMBER IN SAID TUBING AND CASING WHILE SAID CORROSIVE FLUIDS ARE PRODUCED, WHEREBY SAID PORTION OF SAID CASING IS PROTECTED FROM CORROSION BY SAID CORROSIVE FLUIDS AND SAID SACRIFICIAL MEMBER IS CORRODED.
References Cited (Backward Citations)
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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) | 1961-08-04 | 1962-02-03 | 1962-08-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-04 | 1966-02-03 | 1966-08-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-04 | 1970-02-03 | 1970-08-05 | $7700.00 | Window Closed / Lapsed |