Patent US3623550A successfully refreshed from Google Patents.
US3623550A
Expired / Lapsed
US
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Apparatus for plugging cased petroleum production wells
Assignee: Entreprise de Recherches et dActivites Petrolieres SA
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Filing: 1970-02-16
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Granted: 1971-11-30
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Expires: 1990-02-16
Abstract
Abstract An umbrella unit which is screwed to an actuating tool and lowered into the production tubing of an oil well by means of a wire line is fitted with a set of upwardly directed and a set of downwardly directed spring-actuated knives which are outwardly and radially displaceable within the well casing so as to lock said umbrella against the casing wall in the required plugging position, the umbrella proper being then caused to open out radially and filled with gravel or like material. A spoon comprising a reservoir tube filled at the wellhead with cement grout is lowered by means of a wire line, the cement grout being discharged through bottom openings by means of a glass window which is broken by means of a striker piece upon impact of the bottom of the spoon on the gravel.
Inventors
- 👤 Guy De Lajarte
- 👤 Jacques De Saint Palais
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:57
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/10; E21B33/13; E21B33/136
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
224 words
An apparatus for plugging tube-lined petroleum production wells, wherein said apparatus essentially comprises an umbrella unit associated with its operating tool by screwing, said umbrella unit Being provided with a central rod, a bottom portion carrying a lower set of knives upwardly directed to the top of said rod and a downwardly directed upper set of knives, said knives having springs to displace them radially outwards from said shoe, an umbrella proper formed of blades each attached to a flexible strip to displace said blade radially outwards from the central rod and a sleeve covering the umbrella proper and terminating in a threaded portion through which extends the upper extremity of the central rod and said operating tool being provided with a cylinder, a hollow bottom portion for said cylinder screwed on the umbrella unit and containing a cap rigidly fixed to said rod by a shearable locking pin and to said bottom portion by at least two balls and a top portion for said cylinder attachable to an operating cable carrying a set of spring blades moving towards said top portion under the action of a compressive force and secured at the lower end thereof to a sleeve covering said balls within the production tubing and releasing said balls under the action of extension of said spring blades relative to said top portion.
Claim 2
Independent Claim
224 words
An apparatus for plugging tube-lined petroleum production wells, wherein said apparatus essentially comprises an umbrella unit associated with its operating tool by screwing, said umbrella unit Being provided with a central rod, a bottom portion carrying a lower set of knives upwardly directed to the top of said rod and a downwardly directed upper set of knives, said knives having springs to displace them radially outwards from said shoe, an umbrella proper formed of blades each attached to a flexible strip to displace said blade radially outwards from the central rod and a sleeve covering the umbrella proper and terminating in a threaded portion through which extends the upper extremity of the central rod and said operating tool being provided with a cylinder, a hollow bottom portion for said cylinder screwed on the umbrella unit and containing a cap rigidly fixed to said rod by a shearable locking pin and to said bottom portion by at least two balls and a top portion for said cylinder attachable to an operating cable carrying a set of spring blades moving towards said top portion under the action of a compressive force and secured at the lower end thereof to a sleeve covering said balls within the production tubing and releasing said balls under the action of extension of said spring blades relative to said top portion.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |