US4275789A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Silicate activated lignosulfonate gel treatments of conductive zones
Assignee: BP Corp North America Inc
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Filing: 1979-08-27
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Granted: 1981-06-30
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Expires: 1999-08-27
Abstract
Abstract Highly conductive subterranean zones 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
2026-10-28 22:52
CPC Classifications
C; C08; C08L; C08L97/00; C08L97/005; C09; C09K; C09K8/00; C09K8/50; C09K8/504; C09K8/5045; C09K8/60; C09K8/607
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
48 words
A method of reducing the fluid conductivity of a conductive subterranean zone, which comprises: introducing an aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate into said conductive zone and maintaining said aqueous fluid in said zone until said aqueous fluid is converted to a gel.
Claim 2
Independent Claim
48 words
A method of reducing the fluid conductivity of a conductive subterranean zone, which comprises: introducing an aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate into said conductive zone and maintaining said aqueous fluid in said zone until said aqueous fluid is converted to a gel.
Claim 3
Dependent Claim
20 words
The method of claim 1 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.2 to about 1.
Claim 4
Dependent Claim
20 words
The method of claim 1 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6 to about 0.9.
Claim 5
Dependent Claim
18 words
The method of claim 1 wherein the aqueous fluid contains about 2 to about 10 wt % lignosulfonate.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the aqueous fluid contains about 2 to about 5 wt % lignosulfonate.
Claim 7
Independent Claim
74 words
A method of reducing the fluid conductivity of a conductive zone, which comprises: introducing a gel-forming fluid comprising 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 to about 1 into said conductive zone and maintaining said aqueous fluid in said zone until said aqueous fluid is converted to a gel.
Claim 8
Independent Claim
74 words
A method of reducing the fluid conductivity of a conductive zone, which comprises: introducing a gel-forming fluid comprising 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 to about 1 into said conductive zone and maintaining said aqueous fluid in said zone until said aqueous fluid is converted to a gel.
Claim 9
Dependent Claim
21 words
The method of claim 6 wherein the sodium silicate has a mole ratio of about 3.33 SiO 2 /Na 2 O.
Claim 10
Dependent Claim
20 words
The method of claim 7 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6 to about 0.9.
Claim 11
Dependent Claim
100 words
In a method of treating a subterranean formation penetrated by at least one injection well and having at least one highly conductive zone therein, said zone having a higher fluid conductivity than another conductive zone in the formation, wherein aqueous gel-forming fluid is displaced at least a portion of the way through said highly conductive zone and forms a gel within the formation to reduce the conductivity of said highly conductive zone, the improvement comprising: displacing at least a portion of the way through said highly conductive zone an aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate.
Claim 12
Dependent Claim
100 words
In a method of treating a subterranean formation penetrated by at least one injection well and having at least one highly conductive zone therein, said zone having a higher fluid conductivity than another conductive zone in the formation, wherein aqueous gel-forming fluid is displaced at least a portion of the way through said highly conductive zone and forms a gel within the formation to reduce the conductivity of said highly conductive zone, the improvement comprising: displacing at least a portion of the way through said highly conductive zone an aqueous fluid containing gel-forming amounts of water-soluble lignosulfonate and water-soluble silicate.
Claim 13
Dependent Claim
20 words
The method of claim 9 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.2 to about 1.
Claim 14
Dependent Claim
20 words
The method of claim 9 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6 to about 0.9.
Claim 15
Dependent Claim
18 words
The method of claim 9 wherein the aqueous fluid contains about 2 to about 10 wt % lignosulfonate.
Claim 16
Dependent Claim
18 words
The method of claim 9 wherein the aqueous fluid contains about 2 to about 5 wt % lignosulfonate.
Claim 17
Dependent Claim
116 words
In a method of treating a subterranean formation penetrated by at least one injection well and having at least one highly conductive zone therein, said zone having a higher fluid conductivity than another conductive zone in the formation, wherein an aqueous gel-forming fluid is displaced at least a portion of the way through said highly conductive zone and forms a gel within the formation to reduce the conductivity of said highly conductive zone, the improvement comprising: employing as the gel-forming fluid 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 to about 1.
Claim 18
Dependent Claim
116 words
In a method of treating a subterranean formation penetrated by at least one injection well and having at least one highly conductive zone therein, said zone having a higher fluid conductivity than another conductive zone in the formation, wherein an aqueous gel-forming fluid is displaced at least a portion of the way through said highly conductive zone and forms a gel within the formation to reduce the conductivity of said highly conductive zone, the improvement comprising: employing as the gel-forming fluid 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 to about 1.
Claim 19
Dependent Claim
21 words
The method of claim 14 wherein the sodium silicate has a mole ratio of about 3.33 SiO 2 /Na 2 O.
Claim 20
Dependent Claim
20 words
The method of claim 14 wherein the weight ratio of SiO 2 to lignosulfonate is about 0.6 to about 0.9.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |