US4447339A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Oil well drilling clay conditioners and method of their preparation
Assignee: Reed Lignin Inc
•
Filing: 1981-06-26
•
Granted: 1984-05-08
•
Expires: 2001-06-26
Abstract
Abstract Drilling fluid additives are prepared by oxidation of sulfonated lignin-containing materials with manganese dioxide under highly acidic conditions to make manganese lignosulfonates. Additional improvements in the rheological properties of the additives may be obtained by complexing the manganese lignosulfonate so obtained with a heavy metal cation (preferably iron or copper), by, for example, addition of ferrous sulfate or ferric sulfate to the manganese lignosulfonate. These products show the requisite combination of rheological properties for a satisfactory drilling fluid additive or conditioner.
Inventors
- 👤 William J. Detroit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 03:29
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/20; C09K8/203; Y; Y10; Y10S; Y10S507/00; Y10S507/904
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
31 words
An oil well drilling fluid additive comprising the oxidation product of a sulfonated lignin-containing material and manganese dioxide and having an equivalent manganese content of about 2 to about 15 percent.
Claim 2
Dependent Claim
31 words
An oil well drilling fluid additive comprising the oxidation product of a sulfonated lignin-containing material and manganese dioxide and having an equivalent manganese content of about 2 to about 15 percent.
Claim 3
Dependent Claim
18 words
An additive as in claim 1 wherein said manganese content is from about 4 to about 12 percent.
Claim 4
Dependent Claim
41 words
An oil well drilling additive comprising the oxidation product of a sulfonated lignin-containing material and manganese dioxide having an equivalent manganese content of about 2 to about 15 percent, and wherein said oxidation product is complexed with a heavy metal cation.
Claim 5
Dependent Claim
41 words
An oil well drilling additive comprising the oxidation product of a sulfonated lignin-containing material and manganese dioxide having an equivalent manganese content of about 2 to about 15 percent, and wherein said oxidation product is complexed with a heavy metal cation.
Claim 6
Dependent Claim
27 words
An additive as in claim 3 wherein said heavy metal cation is selected from the group consisting of iron, copper, aluminum, magnesium, zinc, zirconium, or mixture thereof.
Claim 7
Dependent Claim
13 words
An additive as in claim 4 wherein said heavy metal cation is iron.
Claim 8
Dependent Claim
13 words
An additive as in claim 4 wherein said heavy metal cation is copper.
Claim 9
Dependent Claim
20 words
An additive as in claim 5 wherein the amount of complexed iron is from about 5 to about 15 percent.
Claim 10
Dependent Claim
20 words
An additive as in claim 5 wherein the amount of complexed iron is from about 5 to about 15 percent.
Claim 11
Dependent Claim
65 words
A process of preparing sulfonated lignin-manganese complex which comprises oxidizing a sulfonated lignin-containing material with from about 3 to about 30 weight percent manganese dioxide based on said solids content of the sulfonated lignin-containing material, at a temperature of from about 0° C. to about 80° C., under highly acidic conditions using a mineral acid and recovering the sulfonated lignin-manganese complex from the resulting mixture.
Claim 12
Dependent Claim
65 words
A process of preparing sulfonated lignin-manganese complex which comprises oxidizing a sulfonated lignin-containing material with from about 3 to about 30 weight percent manganese dioxide based on said solids content of the sulfonated lignin-containing material, at a temperature of from about 0° C. to about 80° C., under highly acidic conditions using a mineral acid and recovering the sulfonated lignin-manganese complex from the resulting mixture.
Claim 13
Dependent Claim
13 words
A process as in claim 9 wherein said mineral acid is sulfuric acid.
Claim 14
Dependent Claim
29 words
A process as in claim 10 wherein the amount of manganese dioxide is from about 8 to about 20 percent based on the solids content of the sulfonated lignin.
Claim 15
Dependent Claim
40 words
A process as in claim 10 further comprising the steps of adding a base to the reaction mixture to adjust the pH of said mixture to about 3.0 to 4.5 and removing the resulting calcium sulfate precipitate from said mixture.
Claim 16
Dependent Claim
40 words
A process as in claim 11 further comprising the steps of adding a base to the reaction mixture to adjust the pH of said mixture to about 3.0 to 4.5 and removing the resulting calcium sulfate precipitate from said mixture.
Claim 17
Dependent Claim
12 words
A process as in claim 12 wherein said base is sodium hydroxide.
Claim 18
Dependent Claim
12 words
A process as in claim 12 wherein said base is potassium hydroxide.
Claim 19
Dependent Claim
12 words
A process as in claim 13 wherein said base is sodium hydroxide.
Claim 20
Dependent Claim
11 words
A process in claim 13 wherein said base is potassium hydroxide.
Claim 21
Dependent Claim
92 words
A process of preparing sulfonated lignin-manganese-heavy metal cation complex which comprises: (a) oxidizing a sulfonated lignin-containing material with from about 3 to about 30 weight percent manganese dioxide based on said sulfonated lignin-containing material, at a temperature of from about 0° C. to about 80° C., under highly acidic conditions using a mineral acid, thereby making sulfonated lignin-manganese complex, (b) adding a compound of a heavy metal cation to said sulfonated-manganese complex to make sulfonated lignin-manganese-heavy metal cation complex, and (c) recovering said sulfonated lignin-manganese-heavy metal cation complex from the resulting mixture.
Claim 22
Dependent Claim
92 words
A process of preparing sulfonated lignin-manganese-heavy metal cation complex which comprises: (a) oxidizing a sulfonated lignin-containing material with from about 3 to about 30 weight percent manganese dioxide based on said sulfonated lignin-containing material, at a temperature of from about 0° C. to about 80° C., under highly acidic conditions using a mineral acid, thereby making sulfonated lignin-manganese complex, (b) adding a compound of a heavy metal cation to said sulfonated-manganese complex to make sulfonated lignin-manganese-heavy metal cation complex, and (c) recovering said sulfonated lignin-manganese-heavy metal cation complex from the resulting mixture.
Claim 23
Dependent Claim
13 words
A process as in claim 18 wherein said heavy metal cation is iron.
Claim 24
Dependent Claim
13 words
A process as in claim 18 wherein said heavy metal cation is copper.
Claim 25
Dependent Claim
55 words
A process as in claim 18 wherein said mineral acid is sulfuric acid and further comprising the steps of adding a base to the resulting mixture from step (a) to raise the pH of said mixture to about 3.0 to 4.5 and removing the resulting precipitated calcium sulfate prior to complexing the heavy metal cation.
Claim 26
Dependent Claim
12 words
A process as in claim 21 wherein said base is sodium hydroxide.
Claim 27
Dependent Claim
12 words
A process as in claim 21 wherein said base is potassium hydroxide.
Claim 28
Dependent Claim
14 words
A process as in claim 19 wherein said iron is added as iron sulfate.
Claim 29
Dependent Claim
29 words
A process as in claim 24 wherein said iron sulfate is added in an amount between about 5 and about 15 percent iron equivalent based on the final product.
Claim 30
Dependent Claim
14 words
A process as in claim 19 wherein said iron is added as iron-sulfate heptahydrate.
Claim 31
Dependent Claim
30 words
A process as in claim 26 wherein said iron sulfate heptahydrate is added in an amount between about 5 and about 15 percent iron equivalent based on the final product.
References Cited (Backward Citations)
CA691362A
Cited
US2393166A
Cited
US2529760A
Cited
US3138555A
Cited
US2935473A
Cited
US3168511A
Cited
US3244623A
Cited
US3271382A
Cited
US3448096A
Cited
GB1437902A
Cited
US3985667A
Cited
US3957703A
Cited
SU663711A1
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-08 | 1987-11-07 | 1988-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-08 | 1991-11-07 | 1992-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-08 | 1995-11-07 | 1996-05-08 | $7700.00 | Window Closed / Lapsed |