US3784325A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of and apparatus for the gas-lift withdrawal of a liquid from a subterranean space
Assignee: INST CERCETARE SI PROIECTARE TEHNOLOGICA RU
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Filing: 1972-05-22
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Granted: 1974-01-08
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Expires: 1992-05-22
Abstract
Abstract A system for the gas-lift withdrawal of liquid from a subterranean location, especially an oil well, wherein the gas is introduced into a tubing drain at axially spaced circular slot to induce the liquid to flow upwardly through respective venturitype nozzles immediately above each slot in accordance with the Coanda effect.
Inventors
- 👤 H Coanda
- 👤 I Gabor
- 👤 R Posirca
- 👤 C Lazar
- 👤 V Truica
- 👤 V Hanciulescu
- 👤 G Aldea
- 👤 I Bodea
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:41
CPC Classifications
F; F04; F04F; F04F5/00; F04F5/14; F04F5/24; F04F5/26; E; E21; E21B; E21B43/00; E21B43/12; E21B43/121; E21B43/122
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
248 words
An apparatus for the lifting of liquids from a subterranean location, comprising: a well casing reaching downwardly to said location and formed with at least one opening at the bottom of said casing for admitting liquid thereto; a tube string within said casing and defining a space therewith substantially over the length of said string; packing means sealingly disposed between said string and said casing between said opening and said space to prevent entry of said liquid into said space, said string being opened into said casing below said packing means to permit entry of said liquid into said string; and means for feeding air under pressure into said space, said string comprising: a plurality of convergent/divergent nozzles vertically spaced along said string and having upwardly directed divergent portions and downwardly turned mouths leading to the respective convergent portions; a respective sleeve threaded onto a lower end of each of said nozzles and forming in the plane of the respective mouth an annular chamber communicating therewith, said sleeves being formed with apertures communicating between said space and the respective chambers; a respective tubular adjusting member threaded into each sleeve below the respective nozzle and defining with each nozzle an annular slot between the respective chamber and mouth, the axial width of each slot being variable by relative threading displacement of the respective member and sleeve; and a respective tubular spacer threadedly connecting and interposed between each of said nozzles and the sleeve of the next nozzle disposed thereabove.
Claim 2
Independent Claim
248 words
An apparatus for the lifting of liquids from a subterranean location, comprising: a well casing reaching downwardly to said location and formed with at least one opening at the bottom of said casing for admitting liquid thereto; a tube string within said casing and defining a space therewith substantially over the length of said string; packing means sealingly disposed between said string and said casing between said opening and said space to prevent entry of said liquid into said space, said string being opened into said casing below said packing means to permit entry of said liquid into said string; and means for feeding air under pressure into said space, said string comprising: a plurality of convergent/divergent nozzles vertically spaced along said string and having upwardly directed divergent portions and downwardly turned mouths leading to the respective convergent portions; a respective sleeve threaded onto a lower end of each of said nozzles and forming in the plane of the respective mouth an annular chamber communicating therewith, said sleeves being formed with apertures communicating between said space and the respective chambers; a respective tubular adjusting member threaded into each sleeve below the respective nozzle and defining with each nozzle an annular slot between the respective chamber and mouth, the axial width of each slot being variable by relative threading displacement of the respective member and sleeve; and a respective tubular spacer threadedly connecting and interposed between each of said nozzles and the sleeve of the next nozzle disposed thereabove.
Claim 3
Dependent Claim
25 words
The apparatus defined in claim 1, further comprising a tubular reducing member threaded into each of said sleeves and threadedly receiving the spacer disposed therebelow.
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) | 1977-01-07 | 1977-07-09 | 1978-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-07 | 1981-07-09 | 1982-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-07 | 1985-07-09 | 1986-01-08 | $7700.00 | Window Closed / Lapsed |