Patent US3924677A successfully refreshed from Google Patents.
US3924677A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for use in the completion of an oil or gas well
Assignee: Individual
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Filing: 1974-08-29
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Granted: 1975-12-09
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Expires: 1994-08-29
Abstract
Abstract Apparatus for providing a passage between an earth stratum and the interior of a well casing comprising a movable hollow conduit member mounted in the casing wall initially held retracted and immovable, while the casing is lowered, and subsequently, after the casing is set, extended outwardly from the casing wall to contact the stratum. A water soluable plug initially blocks the bore of the conduit member, and the apparatus includes removable means on each end of the plug for preventing premature contact of water with the plug.
Inventors
- 👤 Amnon Prenner
- 👤 Jacob Bear
- 👤 David Tohar
- 👤 Harry Koplin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:15
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/11
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
95 words
An apparatus for providing a passage between an earth stratum and the interior of a well casing comprising a movable hollow conduit member mounted in the casing wall initially held retracted and immovable while the casing is lowered and subsequently after the casing is set extended outwardly from the casing wall to contact said stratum, a dissolvable plug initially blocking the bore of said conduit member, the improvement wherein said plug is water soluable and said apparatus includes removable means on each end of said plug which prevent premature contact of said plug by water.
Claim 2
Independent Claim
95 words
An apparatus for providing a passage between an earth stratum and the interior of a well casing comprising a movable hollow conduit member mounted in the casing wall initially held retracted and immovable while the casing is lowered and subsequently after the casing is set extended outwardly from the casing wall to contact said stratum, a dissolvable plug initially blocking the bore of said conduit member, the improvement wherein said plug is water soluable and said apparatus includes removable means on each end of said plug which prevent premature contact of said plug by water.
Claim 3
Dependent Claim
19 words
The improvement as claimed in claim 1 wherein said plug comprises a mixture of salt and a bonding agent.
Claim 4
Dependent Claim
15 words
The improvement as claimed in claim 2 wherein said bonding agent is an epoxy resin.
Claim 5
Dependent Claim
26 words
The improvement as claimed in claim 1 wherein said means protecting said plug comprises a layer of grease disposed on the outer end of said plug.
Claim 6
Dependent Claim
23 words
The improvement as claimed in claim 4 wherein said means further comprise an end cap on the inner end of said conduit member.
Claim 7
Dependent Claim
17 words
The improvement as claimed in claim 5 wherein said end cap is integral with said conduit member.
Claim 8
Dependent Claim
40 words
The improvement as claimed in claim 1 wherein said conduit member is movably supported in a hollow mounting unit disposed in a hole in said casing wall, a peripheral groove being provided around the outer surface of said mounting unit.
Claim 9
Dependent Claim
92 words
The improvement as claimed in claim 1 wherein said conduit member is movably supported in a hollow mounting unit disposed in a hole in said casing wall, said mounting unit comprising a mounting sleeve in a bearing nut disposed therewithin and supporting said conduit member, said bearing nut being flush at the outside with said sleeve and extending into the casing, a bore being provided at its inner end, a check nut disposed in said bore, the conduit member being held in the axial bores of the bearing nut and check nut.
Claim 10
Dependent Claim
20 words
The improvement as claimed in claim 8 wherein a peripheral groove is provided around the outside of the check nut.
Claim 11
Dependent Claim
30 words
The improvement as claimed in claim 8 wherein internal grooves are provided in the axial bores of the bearing and check nuts and sealing rings are disposed in said grooves.
Claim 12
Dependent Claim
24 words
The improvement as claimed in claim 8 including check means to prevent movement of said conduit member toward the interior of said casing wall.
Claim 13
Dependent Claim
48 words
The improvement as claimed in claim 11 wherein the outer end of said check nut is provided with an enlarged bore surrounding its axial bore, the walls of said enlarged bore being slightly conical, said check means comprising a pluralIty of check balls disposed in said enlarged bore.
Claim 14
Dependent Claim
28 words
The improvement as claimed in claim 1 wherein near the inner end of said conduit member retaining means are provided for preventing the overextension of said conduit member.
Claim 15
Dependent Claim
28 words
The improvement as claimed in claim 13 wherein said retaining means comprise an outer peripheral groove in said conduit member and a retaining ring disposed in said groove.
Claim 16
Dependent Claim
40 words
The improvement as claimed in claim 1 including restraining means to prevent the premature outward sliding of said conduit member, said restraining means comprising a plastic sleeve disposed around the outer surface of the inner end of said conduit member.
Claim 17
Dependent Claim
40 words
The improvement as claimed in claim 15 further including an outer peripheral groove in said conduit member near the inner end thereof and a retaining ring disposed in said groove, a portion of said plastic sleeve overlying said restraining ring.
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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) | 1978-12-08 | 1979-06-09 | 1979-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-08 | 1983-06-09 | 1983-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-08 | 1987-06-09 | 1987-12-09 | $7700.00 | Window Closed / Lapsed |