US4352741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Xanthomonas biopolymer for use in displacement of oil from partially depleted reservoirs
Assignee: OFPG
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Filing: 1981-06-02
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Granted: 1982-10-05
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Expires: 2001-06-02
Abstract
Abstract A mutant strain of the genus Xanthomonas produces a pyruvate-free biopolymer. This biopolymer and the deacetylated form of this new biopolymer provide mobility control solutions which are especially useful for enhanced oil recovery where high brine applications are involved. The mobility control solutions of the present invention may be made from whole or filtered fermentation broth containing the pyrvuate-free biopolymer or its deacetylated form. Alternatively, the biopolymer or its deacetylated form may be recovered from the broth and the recovered product used to form the desired mobility control solutions.
Inventors
- 👤 William C. Wernau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 14:07
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/58; C09K8/588; C09K8/60; C09K8/84; C09K8/86; C09K8/88; C09K8/90; C09K8/905; C12; C12P; C12P19/00; C12P19/04; C12P19/06; Y; Y10; Y10S; Y10S507/00; Y10S507/935; Y10S507/936
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
43 words
In the process for the recovery of crude oil from an oil-bearing subterranean formation wherein a hydrophilic colloid-containing mobility control solution is injected into said formation, the improvement which comprises injecting into said formation a mobility control solution containing pyruvate-free xanthan-containing fermentation broth.
Claim 2
Dependent Claim
43 words
In the process for the recovery of crude oil from an oil-bearing subterranean formation wherein a hydrophilic colloid-containing mobility control solution is injected into said formation, the improvement which comprises injecting into said formation a mobility control solution containing pyruvate-free xanthan-containing fermentation broth.
Claim 3
Dependent Claim
19 words
The process of claim 1 wherein said mobility control solution has a salt content of at least 7.0% w/v.
Claim 4
Dependent Claim
44 words
In the process for the recovery of crude oil from an oil-bearing subterranean formation wherein a hydrophilic colloid-containing mobility control solution is injected into said formation, the improvement which comprises injecting into said formation a mobility control solution containing deacetylated pyruvate-free xanthan-containing fermentation broth.
Claim 5
Dependent Claim
44 words
In the process for the recovery of crude oil from an oil-bearing subterranean formation wherein a hydrophilic colloid-containing mobility control solution is injected into said formation, the improvement which comprises injecting into said formation a mobility control solution containing deacetylated pyruvate-free xanthan-containing fermentation broth.
Claim 6
Dependent Claim
19 words
The process of claim 3 wherein said mobility control solution has a salt content of at least 7.0% w/v.
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) | 1985-10-04 | 1986-04-05 | 1986-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-04 | 1990-04-05 | 1990-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-04 | 1994-04-05 | 1994-10-05 | $7700.00 | Window Closed / Lapsed |