Patent US4347146A successfully refreshed from Google Patents.
US4347146A
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Oil recovery process employing a non-ionic glucan in combination with clay flocculant
Assignee: Mobil Oil AS
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Filing: 1981-01-29
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Granted: 1982-08-31
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Expires: 2001-01-29
Abstract
Abstract Certain glucans are made useful as mobility control agents in subterranean oil recovery by the addition of a clay flocculant to minimize adsorption losses. Because of the non-ionic character of glucans, these losses are excessive in the absence of the flocculants used herein.
Inventors
- 👤 Milton K. Abdo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:29
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/206; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
90 words
In an improved process for producing petroleum from a petroleum-bearing subterranean formation wherein an aqueous driving fluid containing a poly(glycosylglucan) thickening agent, the glycosylglucan having the structural formula: ##STR3## is injected into said formation through an input well and passed through the formation to an output well, the improvement comprising employing in combination with said poly(glycosylglucan) between about 5 ppm and about 50 ppm or unhydrolyzed polyacrylamide having a weight average molecular weight between about one million and about 7 million, whereby adsorption of said poly(glycosylglucan) by clays is minimized.
Claim 2
Dependent Claim
90 words
In an improved process for producing petroleum from a petroleum-bearing subterranean formation wherein an aqueous driving fluid containing a poly(glycosylglucan) thickening agent, the glycosylglucan having the structural formula: ##STR3## is injected into said formation through an input well and passed through the formation to an output well, the improvement comprising employing in combination with said poly(glycosylglucan) between about 5 ppm and about 50 ppm or unhydrolyzed polyacrylamide having a weight average molecular weight between about one million and about 7 million, whereby adsorption of said poly(glycosylglucan) by clays is minimized.
Claim 3
Dependent Claim
34 words
The improved process of claim 1 wherein the poly(glycosylglucan) has a molecular weight such that a 1 percent by weight aqueous solution thereof has a viscosity of from about 500 to about 3000 centipoises.
Claim 4
Dependent Claim
22 words
The improved process of claim 1 wherein the molecular weight of the unhydrolyzed polyacrylamide is from about 3 to about 5 million.
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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) | 1985-08-30 | 1986-03-01 | 1986-08-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-30 | 1990-03-01 | 1990-08-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-30 | 1994-03-01 | 1994-08-31 | $7700.00 | Window Closed / Lapsed |