Patent US3908763A successfully refreshed from Google Patents.
US3908763A
Expired / Lapsed
US
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Method for pumpin paraffine base crude oil
Assignee: Individual
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Filing: 1974-02-21
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Granted: 1975-09-30
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Expires: 1994-02-21
Abstract
Abstract The method of inducing and maintaining the flow of paraffine base oil in a well structure which comprises heating and maintaining the well structure at a temperature below the fracturing and melting temperature of the paraffine, within that range of temperature where the paraffine is dissolved and/or reabsorbed and carried, in fluid state by the oil and above that chill temperature where the paraffine in the oil solidifies and separates from the oil.
Inventors
- 👤 Drexel W Chapman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:20
CPC Classifications
E; E21; E21B; E21B36/00; E21B37/00
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
126 words
THE METHOD FOR MAINTAINING CONTINUOUS, UNIFORM, FREE FLOW OF PARAFFINE LADENED CRUDE OIL IN A WELL STRUCTURE INCLUDING AN ELONGATE VERTICAL WELL BORE EXTENDING DOWNWARDLY FROM GROUND LVEL TO A PRODUCTION ZONE, A CASING IN THE BORE, A PRODUCTION TUBING EXTENDING FREELY THROUGH THE CASING, A PUMP RELATED TO THE LOWER END OF THE TUBING AND HEATING MEANS AT UPPER END OF AND EXTENDING THROUGH THE WELL STRUCTURE, SAID METHOD COMPRISING HEATING AND MAINTAINING THE WELL STRUCTURE AND PARAFINE LADENED CRUDE OIL THEREIN AT A TEMPERATURE ABOVE THAT CHILL TEMPERATURES AT WHICH THE PARAFFINE IN THE CRUDE OIL SEPARATES FROM THE CRUDE OIL AND SOLIDIFIES, WITHIN THAT TEMPERATURE RANGE IN WHICH THE PARAFFINE IS AND REMAINS DISSOLVED IN THE CRUDE OIL, BELOW THE MELTING TEMPERATURE OF
Claim 2
Independent Claim
126 words
THE METHOD FOR MAINTAINING CONTINUOUS, UNIFORM, FREE FLOW OF PARAFFINE LADENED CRUDE OIL IN A WELL STRUCTURE INCLUDING AN ELONGATE VERTICAL WELL BORE EXTENDING DOWNWARDLY FROM GROUND LVEL TO A PRODUCTION ZONE, A CASING IN THE BORE, A PRODUCTION TUBING EXTENDING FREELY THROUGH THE CASING, A PUMP RELATED TO THE LOWER END OF THE TUBING AND HEATING MEANS AT UPPER END OF AND EXTENDING THROUGH THE WELL STRUCTURE, SAID METHOD COMPRISING HEATING AND MAINTAINING THE WELL STRUCTURE AND PARAFINE LADENED CRUDE OIL THEREIN AT A TEMPERATURE ABOVE THAT CHILL TEMPERATURES AT WHICH THE PARAFFINE IN THE CRUDE OIL SEPARATES FROM THE CRUDE OIL AND SOLIDIFIES, WITHIN THAT TEMPERATURE RANGE IN WHICH THE PARAFFINE IS AND REMAINS DISSOLVED IN THE CRUDE OIL, BELOW THE MELTING TEMPERATURE OF
Claim 3
Dependent Claim
31 words
The method set forth in claim 1 which includes heating the well structure without the introduction and admixing of water and foreign fluids into and with the structure and crude oil.
Claim 4
Dependent Claim
39 words
The method set forth in claim 1 wherein the well structure and the paraffine ladened crude oil is heated and maintained at a temperature below 126*F and above that minimum temperature at which the paraffine dissolves in the oil.
Claim 5
Dependent Claim
63 words
The method as set forth in claim 1 wherein thE well structure and the paraffine ladened crude oil is heated and maintained at a temperature below 125*F and at least 10*F above that temperature at which the paraffine dissolves in the oil, said well structure is heated without the introduction and admixing of water and foreign fluids into the structure and crude oil.
Claim 6
Dependent Claim
95 words
A method as set forth in claim 1 wherein said heating means of the well structure includes an elongate heat transfer conductor tube extending downwardly into and thence upwardly through the well structure, a fluid heating medium, heater means adjacent the top of the well to heat said medium and means to circulate the medium through the heater means and the tube, said method including heating the oil by heat transfer between the oil and heated fluid medium and through a heat transfer conductor therebetween, whereby the oil is heated without the introduction of water.
Claim 7
Dependent Claim
42 words
The method set forth in claim 5 wherein the well structure and the paraffine ladened crude oil is heated and maintained at a temperature below 125*F and at least 10*F above that temperature at which the paraffine is dissolved in the oil.
Claim 8
Dependent Claim
73 words
The method set forth in claim 5 wherein the well structure and the paraffine ladened crude oil is heated and maintained at a temperature below 125*F and at least 10*F above that temperature at which the paraffine is dissolved in the oil, said well structure and oil is heated by conduction of heat from a heated fluid medium circulated through the well structure and without the introduction of water into the crude oil.
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) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |