Patent US3724548A successfully refreshed from Google Patents.
US3724548A
Expired / Lapsed
US
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Waterflooding method using modified starch granules
Assignee: Phillips Petroleum Co
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Filing: 1971-02-17
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Granted: 1973-04-03
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Expires: 1991-02-17
Abstract
Abstract Adding modified starch granules of a preselected size to the flood water for waterflooding a hydrocarbon containing formation and improving the flood front of said flood water.
Inventors
- 👤 H Parker
- 👤 J Marx
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 21:31
CPC Classifications
E; E21; E21B; E21B43/00; E21B43/16; E21B43/20
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
30 words
A method, as set forth in claim 1, wherein the starch granules are selected from at least one of a group of rice starch, cornstarch, wheat starch and potato starch.
Claim 2
Dependent Claim
24 words
A method, as set forth in claim 1, wherein the starch granules are intermittently added to the flood water stream at spaced apart locations.
Claim 3
Dependent Claim
14 words
A method, as set forth in claim 1, wherein the flood water is brine.
Claim 4
Dependent Claim
28 words
A method, as set forth in claim 1, wherein the bactericides are added to the flood water stream to prevent degradation of the starch material within the formation.
Claim 5
Dependent Claim
31 words
A method, as set forth in claim 1, wherein the flood water stream is injected into a plurality of injection wells and fluids are produced through a plurality of producing wells.
Claim 6
Independent Claim
111 words
A method for recovering hydrocarbons from subterranean hydrocarbon-containing formatIons penetrated by at least one injection well and at least one remotely located producing well, comprising: injecting downwardly through the injection well and into the formation a stream of flood water haVing suspended in at least a portion of said stream a volume of starch granules having a size in the range of about 5-32 microns with said granules being crosslinked to have an increased mechanical strength and substantially no decrease in swelling properties, said granules being cross-linked with at least one of epichlorohydrin, formaldehyde, an organic dihalide, or an alkyl ester; and producing to the surface fluid entering the producing well.
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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |