US3268801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus having a pair of spaced electrodes for measuring spontaneous potentials in a well bore while drilling
Assignee: Texaco Inc
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Filing: 1963-04-30
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Granted: 1966-08-23
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Expires: 1983-04-30
Abstract
No abstract record available.
Inventors
- 👤 Roy J Clements
- 👤 Roland B Stelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:58
CPC Classifications
G; G01; G01V; G01V3/00; G01V3/18; G01V3/26; G01V3/265
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
APPARATUS FOR MAKING A DIFFERENTIAL SPONTANEOUS POTENTIAL LOG OF A WELL BORE PENETRATING EARTH FORMATIONS WHILE DRILLING OPERATIONS ARE IN PROGRESS COMPRISING A ROTATABLE DRILL STRING INCLUDING A DRILL BIT AT THE BOTTOM END THEREOF AND A TUBULAR INSTRUMENTATION MEMBER LOCATED ABOVE SAID DRILL BIT, A SEALED HOUSING CONTAINED WITHIN SAID TUBULAR MEMBER, INSTRUMENTATION MEANS DISPOSED WITHIN SAID HOUSING FOR MEASURING ELECTRICAL POTENTIALS, A LAYER OF INSULATING MATERIAL SURROUNDING SAID TUBULAR MEMBER FOR A SUBSTANTIAL PORTION OF THE LENGTH OF SAID TUBULAR MEMBER, AND FIRST AND SECOND ELECTRODES AFFIXED IN SPACED RELATIONSHIP IN THE OUTER CIRCUMFERENCE OF SAID INSULATING MATERIAL AND INSULATED THEREBY FROM SAID TUBULAR MEMBER AND FROM EACH OTHER, MEANS CONNECTED TO SAID FIRST AND SAID SECOND ELECTRODES FOR RECORDING ELECTRICAL POTENTIALS EXISTING BETWEEN SAID ELECTRODES DUE TO SELF-GENERATING PROPERTIES OF SAID EARTH FORMATIONS WHILE DRILLING OPERATIONS ARE IN PROGRESS AND MEANS FOR CORRELATING SAID
Claim 2
Dependent Claim
147 words
APPARATUS FOR MAKING A DIFFERENTIAL SPONTANEOUS POTENTIAL LOG OF A WELL BORE PENETRATING EARTH FORMATIONS WHILE DRILLING OPERATIONS ARE IN PROGRESS COMPRISING A ROTATABLE DRILL STRING INCLUDING A DRILL BIT AT THE BOTTOM END THEREOF AND A TUBULAR INSTRUMENTATION MEMBER LOCATED ABOVE SAID DRILL BIT, A SEALED HOUSING CONTAINED WITHIN SAID TUBULAR MEMBER, INSTRUMENTATION MEANS DISPOSED WITHIN SAID HOUSING FOR MEASURING ELECTRICAL POTENTIALS, A LAYER OF INSULATING MATERIAL SURROUNDING SAID TUBULAR MEMBER FOR A SUBSTANTIAL PORTION OF THE LENGTH OF SAID TUBULAR MEMBER, AND FIRST AND SECOND ELECTRODES AFFIXED IN SPACED RELATIONSHIP IN THE OUTER CIRCUMFERENCE OF SAID INSULATING MATERIAL AND INSULATED THEREBY FROM SAID TUBULAR MEMBER AND FROM EACH OTHER, MEANS CONNECTED TO SAID FIRST AND SAID SECOND ELECTRODES FOR RECORDING ELECTRICAL POTENTIALS EXISTING BETWEEN SAID ELECTRODES DUE TO SELF-GENERATING PROPERTIES OF SAID EARTH FORMATIONS WHILE DRILLING OPERATIONS ARE IN PROGRESS AND MEANS FOR CORRELATING SAID
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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |