US2704979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control of paraffin deposition
Assignee: Shell Development Co
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Filing: 1950-07-28
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Granted: 1955-03-29
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Expires: 1970-07-28
Abstract
No abstract record available.
Inventors
- 👤 Gerrit Van Willigen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:32
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/52; C09K8/524
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
200 words
AN APPARATUS FOR PRODUCING AN OIL WELL, COMPRISING A FIRST TUBING STRING EXTENDING FROM THE SURFACE OF THE GROUND TO THE OIL PRODUCING RESERVOIR, A SECOND TUBING STRING OF LARGER DIAMETER SURROUNDING SAID FIRST TUBING STRING IN SPACED RELATIONSHIP THEREWITH AND EXTENDING INTO XXLE WELL TO A DEPTH BELOW THAT OF THE ZONE IN WHICH SUBXXANTIAL QUANTITIES OF PARAFFIN ARE DEPOSITED FROM THE WELL CLOSURE MEANS WITHIN THE LOWER END OF SAID SECOND TUBING STRING FOR CLOSING THE ANNULAR SPACE BETWEEN SAID FIRST AND SECOND TUBING STRINGS, FLUID DISCHARGE PORT MEANS THROUGH THE WALL OF SAID SECOND TUBING STRING NEAR THE UPPER END THEREOF, FLUID PORT MEANS THROUGH THE WALL OF SAID FIRST TUBING ABOVE SAID CLOSURE MEANS, PUMP MEANS CARRIED AT THE LOWER END OF SAID FIRST TUBING STRING, A STRING OF SUCKER RODS SECURED TO THE PUMP MEANS AND EXTENDING TO THE SURFACE WITHIN FIRST TUBING STRING FOR RECIPROCATING SAID PUMP MEANS, MEANS AT THE SURFACE CLOSING THE ANNULAR SPACE BETWEEN THE FIRST AND THE SECOND STRINGS, AND MEANS CIENT TO PREVENT THE OIL FROM RISING WITHIN SAID FIRST STRING TO A LEVEL APPRECIABLY HIGHER THAN THAT OF SAID FLUID PORT MEANS WHEN SAID PUMP MEANS IS OPERATED.
Claim 2
Independent Claim
200 words
AN APPARATUS FOR PRODUCING AN OIL WELL, COMPRISING A FIRST TUBING STRING EXTENDING FROM THE SURFACE OF THE GROUND TO THE OIL PRODUCING RESERVOIR, A SECOND TUBING STRING OF LARGER DIAMETER SURROUNDING SAID FIRST TUBING STRING IN SPACED RELATIONSHIP THEREWITH AND EXTENDING INTO XXLE WELL TO A DEPTH BELOW THAT OF THE ZONE IN WHICH SUBXXANTIAL QUANTITIES OF PARAFFIN ARE DEPOSITED FROM THE WELL CLOSURE MEANS WITHIN THE LOWER END OF SAID SECOND TUBING STRING FOR CLOSING THE ANNULAR SPACE BETWEEN SAID FIRST AND SECOND TUBING STRINGS, FLUID DISCHARGE PORT MEANS THROUGH THE WALL OF SAID SECOND TUBING STRING NEAR THE UPPER END THEREOF, FLUID PORT MEANS THROUGH THE WALL OF SAID FIRST TUBING ABOVE SAID CLOSURE MEANS, PUMP MEANS CARRIED AT THE LOWER END OF SAID FIRST TUBING STRING, A STRING OF SUCKER RODS SECURED TO THE PUMP MEANS AND EXTENDING TO THE SURFACE WITHIN FIRST TUBING STRING FOR RECIPROCATING SAID PUMP MEANS, MEANS AT THE SURFACE CLOSING THE ANNULAR SPACE BETWEEN THE FIRST AND THE SECOND STRINGS, AND MEANS CIENT TO PREVENT THE OIL FROM RISING WITHIN SAID FIRST STRING TO A LEVEL APPRECIABLY HIGHER THAN THAT OF SAID FLUID PORT MEANS WHEN SAID PUMP MEANS IS OPERATED.
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) | 1958-03-28 | 1958-09-27 | 1959-03-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-03-28 | 1962-09-27 | 1963-03-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-03-28 | 1966-09-27 | 1967-03-29 | $7700.00 | Window Closed / Lapsed |