Patent US3594103A successfully refreshed from Google Patents.
US3594103A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subsurface pump and method
Assignee: OILWELL Inc A CORP OF
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Filing: 1970-01-08
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Granted: 1971-07-20
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Expires: 1990-01-08
Abstract
Abstract A subsurface pump and pumping method particularly for use in gassy oil wells to improve pumping efficiency and avoid gaslocks. A body of relatively gas-free fluid is trapped during each upstroke of the pump plunger. Gassy fluid coming directly from the well blends with this body to produce a blended fluid having a lower proportion of gas. The plunger encounters the blended fluid on its downstroke.
Inventors
- 👤 Glen L Hillis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:45
CPC Classifications
F; F04; F04B; F04B53/00; F04B53/16; F04B53/162
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
84 words
In a subsurface pump which includes at least one barrel, a hollow plunger movable through upstrokes and downstrokes within said barrel, a standing valve mounted on said barrel, and a traveling valve mounted on said plunger, the improvement comprising means connected with said barrel for forming a trapped relatively gas free body of fluid during upstrokes of said plunger and blending fluid from said barrel with said body near the conclusion of each upstroke, whereby said plunger encounters the blended fluid on its downstrokes.
Claim 2
Dependent Claim
84 words
In a subsurface pump which includes at least one barrel, a hollow plunger movable through upstrokes and downstrokes within said barrel, a standing valve mounted on said barrel, and a traveling valve mounted on said plunger, the improvement comprising means connected with said barrel for forming a trapped relatively gas free body of fluid during upstrokes of said plunger and blending fluid from said barrel with said body near the conclusion of each upstroke, whereby said plunger encounters the blended fluid on its downstrokes.
Claim 3
Dependent Claim
53 words
A pump as defined in claim 1 in which said means comprises an upper barrel spaced above said first-named barrel and a connecting tube joining said barrels end-to-end and being of larger inside diameter than said barrels, said plunger being longer than said connecting tube, said body being formed within said connecting tube.
Claim 4
Independent Claim
96 words
A method of pumping fluid from a gassy oil well comprising operating a subsurface pump within the well through upstrokes and downstrokes of its plunger, drawing gassy fluid from the well into the pump during each upstroke, forming a trapped body of relatively gas free fluid within the pump at the midportion of each upstroke, blending said gassy fluid with said body near the conclusion of each upstroke to produce blended fluid having a lower proportion of gas than said gassy fluid, and encountering the blended fluid with the plunger at the beginning of each downstroke.
Claim 5
Independent Claim
96 words
A method of pumping fluid from a gassy oil well comprising operating a subsurface pump within the well through upstrokes and downstrokes of its plunger, drawing gassy fluid from the well into the pump during each upstroke, forming a trapped body of relatively gas free fluid within the pump at the midportion of each upstroke, blending said gassy fluid with said body near the conclusion of each upstroke to produce blended fluid having a lower proportion of gas than said gassy fluid, and encountering the blended fluid with the plunger at the beginning of each downstroke.
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) | 1974-07-19 | 1975-01-18 | 1975-07-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-19 | 1979-01-18 | 1979-07-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-19 | 1983-01-18 | 1983-07-20 | $7700.00 | Window Closed / Lapsed |