Patent US3603396A successfully refreshed from Google Patents.
US3603396A
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Method for increasing subterranean formation permeability
Assignee: Atlantic Richfield Co
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Filing: 1969-12-15
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Granted: 1971-09-07
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Expires: 1989-12-15
Abstract
Abstract A method for increasing the permeability of an already hydrated clay or shale subterranean formation by at least partially dehydrating at least a portion of the formation by heating or injection of a dehydrating liquid or gas, contacting at least part of the dehydrated portion of the formation with a material which hinders rehydration of the formation and thereafter exposing the formation to water.
Inventors
- 👤 Philip H Braun
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:32
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/25
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
A method according to claim 1 wherein said hydration hindering material is employed in amounts of at least about 0.01 pounds per barrel of formation pore space.
Claim 2
Dependent Claim
15 words
A method according to claim 1 wherein said formation contains substantial amounts of montmorillonite clay.
Claim 3
Dependent Claim
14 words
A method according to claim 1 wherEin said formation is dehydrated by heating same.
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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) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |