Patent US3589442A successfully refreshed from Google Patents.
US3589442A
Expired / Lapsed
US
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Well shock device
Assignee: Dresser Industries Inc
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Filing: 1969-06-27
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Granted: 1971-06-29
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Expires: 1989-06-27
Abstract
Abstract A shock device for unplugging perforations in a well and the like which comprises a chamber of low pressure relative to the pressure adjacent the perforations, the chamber being suddenly openable to the pressure adjacent the perforations with a consequent shock effect on the perforations.
Inventors
- 👤 Marion D Kilgore
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:12
CPC Classifications
E; E21; E21B; E21B37/00; E21B37/08; E21B43/00; E21B43/25; E21B43/26; E21B43/263
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
110 words
In a shock device for wells, means for separating a section of the well from adjacent sections to define an isolation zone, a chamber, said well section isolating means being spaced apart packing means carried by said chamber, means for openly connecting said defined isolation zone and said chamber, said means for connecting said defined isolation zone and said chamber being a plurality of apertures around the periphery of said chamber between said spaced apart packing means, blocking means for preventing pressure from said defined isolation zone from entering said chamber, and means for releasing said blocking means to allow pressure from said defined isolation zone to enter said chamber.
Claim 2
Dependent Claim
110 words
In a shock device for wells, means for separating a section of the well from adjacent sections to define an isolation zone, a chamber, said well section isolating means being spaced apart packing means carried by said chamber, means for openly connecting said defined isolation zone and said chamber, said means for connecting said defined isolation zone and said chamber being a plurality of apertures around the periphery of said chamber between said spaced apart packing means, blocking means for preventing pressure from said defined isolation zone from entering said chamber, and means for releasing said blocking means to allow pressure from said defined isolation zone to enter said chamber.
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |