Patent US4257813A successfully refreshed from Google Patents.
US4257813A
Expired / Lapsed
US
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Formation treatment with silicate activated lignosulfonate gel
Assignee: BP Corp North America Inc
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Filing: 1979-04-27
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Granted: 1981-03-24
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Expires: 1999-04-27
Abstract
Abstract Highly conductive zones in subterranean formations are treated with aqueous fluids containing gel-forming amounts of water-soluble lignosulfonate and silicate. Suitable treating fluids contain about 2 to about 5 weight percent sodium or ammonium lignosulfonate and sodium silicate at a weight ratio of SiO 2 to lignosulfonate of about 0.2 to about 1.
Inventors
- 👤 Dan D. Lawrence
- 👤 Betty J. Felber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:48
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045; C08; C08L; C08L97/00; C08L97/005
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
27 words
An aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate, wherein the weight ratio of SiO 2 to lignosulfonate is about 0.2:1 to about 1:1.
Claim 2
Dependent Claim
27 words
An aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate, wherein the weight ratio of SiO 2 to lignosulfonate is about 0.2:1 to about 1:1.
Claim 3
Dependent Claim
21 words
The aqueous fluid of claim 1 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6:1 to about 0.9:1.
Claim 4
Dependent Claim
20 words
The aqueous fluid of claim 1 wherein the fluid contains about 2 to about 10 wt % water soluble lignosulfonate.
Claim 5
Dependent Claim
19 words
The aqueous fluid of claim 1 wherein the fluid contains about 2 to about 5 wt % water-soluble lignosulfonate.
Claim 6
Dependent Claim
37 words
An aqueous fluid containing about 2 to about 5 wt % water soluble sodium or ammonium lignosulfonate and water soluble sodium silicate at a weight ratio of SiO 2 to lignosulfonate of about 0.2:1 to about 1:1.
Claim 7
Dependent Claim
37 words
An aqueous fluid containing about 2 to about 5 wt % water soluble sodium or ammonium lignosulfonate and water soluble sodium silicate at a weight ratio of SiO 2 to lignosulfonate of about 0.2:1 to about 1:1.
Claim 8
Dependent Claim
22 words
The aqueous fluid of claim 5 wherein the sodium silicate has a mole ratio of about 3.33 SiO 2 /Na 2 O.
Claim 9
Dependent Claim
21 words
The aqueous fluid of claim 5 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6:1 to about 0.9:1.
References Cited (Backward Citations)
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US3615780A
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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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |