US4525562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thermally stable drilling fluid additive
Assignee: MI Drilling Fluids Co
•
Filing: 1983-06-07
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Granted: 1985-06-25
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Expires: 2003-06-07
Abstract
Abstract This invention relates to a water soluble polymer and method for its preparation. The water soluble polymer exhibits superior thermal stability characteristics when used as an additive in aqueous drilling fluids. The polymer consists of a major portion of a catechol based monomer and a dicarboxylic acid. Other monomers and materials are added to enhance the functional characteristics of the drilling fluid additive. The method of this invention includes the mixing of monomers, polymerization of that mixture and optionally the steps of hydrolysis and sulfonation.
Inventors
- 👤 Arvind D. Patel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:21
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22; C09K8/24; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/14; C08F212/22; C08F212/30; C08F8/00; C08F8/34; C08F8/36; C08F2800/00; C08F2800/20
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
166 words
A water soluble polymer having thermal stability and exhibiting utility as an aqueous drilling fluid additive comprising: (a) a major portion of a catechol based monomer having the formula: ##STR7## wherein R 1 is a hydrogen, hydroxyl or methoxy; wherein R 2 is a hydrogen, methyl or part of a methylene group and wherein R 3 is a hydrogen, methyl or part of a methylene group; (b) a minor portion of an unsaturated sulfonic acid of the formula: ##STR8## wherein Y represents a direct combination or a bridging element according to the formula: ##STR9## and X + represents a cation; (c) a minor portion of a dicarboxylic acid monomer; (d) an N-vinyl acylamine having the structure: ##STR10## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group and R 5 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (e) a substituted amide of the formula: ##STR11## wherein R 6 is a hydrogen or a methyl group.
Claim 2
Dependent Claim
166 words
A water soluble polymer having thermal stability and exhibiting utility as an aqueous drilling fluid additive comprising: (a) a major portion of a catechol based monomer having the formula: ##STR7## wherein R 1 is a hydrogen, hydroxyl or methoxy; wherein R 2 is a hydrogen, methyl or part of a methylene group and wherein R 3 is a hydrogen, methyl or part of a methylene group; (b) a minor portion of an unsaturated sulfonic acid of the formula: ##STR8## wherein Y represents a direct combination or a bridging element according to the formula: ##STR9## and X + represents a cation; (c) a minor portion of a dicarboxylic acid monomer; (d) an N-vinyl acylamine having the structure: ##STR10## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group and R 5 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (e) a substituted amide of the formula: ##STR11## wherein R 6 is a hydrogen or a methyl group.
Claim 3
Dependent Claim
24 words
The water soluble polymer of claim 1 further comprising a material selected from the group consisting of: styrene, styrene sulfonic acid or combinations thereof.
Claim 4
Dependent Claim
27 words
The water soluble polymer of claim 1 wherein said dicarboxylic acid is selected from the group consisting of: maleic anhydride, tetrahydrophthalic anhydride, itaconic acid or combinations thereof.
Claim 5
Dependent Claim
14 words
The water soluble polymer of claim 2 wherein said catechol based monomer is sulfonated.
Claim 6
Dependent Claim
32 words
The water soluble polymer of claim 1 further comprising an alkyl substituted amine of the formula: ##STR12## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group.
Claim 7
Dependent Claim
33 words
The water soluble polymer of claim 1 further comprising a mono-carboxylic acid of the formula: ##STR13## wherein R 6 represents a hydrogen or a methyl group and wherein X + represents a cation.
Claim 8
Dependent Claim
232 words
A water soluble polymer having thermal stability and exhibiting utility as an aqueous drilling fluid additive comprising: (a) a major portion of a catechol based monomer having the formula: ##STR14## wherein R 1 is a hydrogen, hydroxyl or methoxy; wherein R 2 is a hydrogen, methyl or part of a methylene group and wherein R 3 is a hydrogen, methyl or part of a methylene group; (b) a minor portion of an unsaturated sulfonic acid of the formula: ##STR15## wherein Y represents a direct combination or a bridging element according to the formula: ##STR16## and X + represents a cation; (c) a minor portion of a dicarboxylic acid monomer; (d) an N-vinyl acylamine having the structure: ##STR17## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group and R 5 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (e) a substituted amide of the formula: ##STR18## wherein R 6 is a hydrogen or a methyl group. (f) a material selected from the group consisting of: styrene, styrene sulfonic acid or combinations thereof; (g) an alkyl substituted amine of the formula: ##STR19## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (h) a mono-carboxylic acid of the formula: ##STR20## wherein R 6 represents a hydrogen or a methyl group and wherein X + represents a cation.
Claim 9
Dependent Claim
232 words
A water soluble polymer having thermal stability and exhibiting utility as an aqueous drilling fluid additive comprising: (a) a major portion of a catechol based monomer having the formula: ##STR14## wherein R 1 is a hydrogen, hydroxyl or methoxy; wherein R 2 is a hydrogen, methyl or part of a methylene group and wherein R 3 is a hydrogen, methyl or part of a methylene group; (b) a minor portion of an unsaturated sulfonic acid of the formula: ##STR15## wherein Y represents a direct combination or a bridging element according to the formula: ##STR16## and X + represents a cation; (c) a minor portion of a dicarboxylic acid monomer; (d) an N-vinyl acylamine having the structure: ##STR17## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group and R 5 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (e) a substituted amide of the formula: ##STR18## wherein R 6 is a hydrogen or a methyl group. (f) a material selected from the group consisting of: styrene, styrene sulfonic acid or combinations thereof; (g) an alkyl substituted amine of the formula: ##STR19## wherein R 4 is a hydrogen, a methyl or part of a cyclic trimethylene group; and (h) a mono-carboxylic acid of the formula: ##STR20## wherein R 6 represents a hydrogen or a methyl group and wherein X + represents a cation.
Claim 10
Dependent Claim
27 words
The water soluble polymer of claim 7 wherein said dicarboxylic acid is selected from the group consisting of: maleic anhydride, tetrahydrophthalic anhydride, itaconic acid or combinations thereof.
Claim 11
Dependent Claim
14 words
The water soluble polymer of claim 7 wherein said catechol based monomer is sulfonated.
References Cited (Backward Citations)
US2209289A
Cited
US2354672A
Cited
US2477157A
Cited
US2459835A
Cited
US2552775A
Cited
US2704277A
Cited
US2582265A
Cited
US2582266A
Cited
US2831022A
Cited
US2801981A
Cited
US2911365A
Cited
US3108956A
Cited
US3230201A
Cited
US3434970A
Cited
US3476795A
Cited
US3535238A
Cited
US3535239A
Cited
US3537992A
Cited
US3511820A
Cited
US3511874A
Cited
US3642622A
Cited
US3768565A
Cited
US3764530A
Cited
US3752763A
Cited
US4008202A
Cited
US3932488A
Cited
US3856845A
Cited
US3730900A
Cited
US3879299A
Cited
US3879298A
Cited
DE2502012A1
Cited
US3907927A
Cited
US3953342A
Cited
DE2547773A1
Cited
JPS526791A
Cited
US4357245A
Cited
US4388451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-06-24 | 1988-12-24 | 1989-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-06-24 | 1992-12-24 | 1993-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-06-24 | 1996-12-24 | 1997-06-25 | $7700.00 | Window Closed / Lapsed |