US4802998A
Expired / Lapsed
US
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Powder-form lubricant additives for water-based drilling fluids
Assignee: Henkel AG and Co KGaA
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Filing: 1987-07-08
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Granted: 1989-02-07
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Expires: 2007-07-08
Abstract
Abstract Powder-form lubricant additives for water-based drilling fluids which contain from 95 to 30% by weight, based on the total weight of the powder, of highly disperse silicas, from 5 to 70% by weight, based on the total weight of the powder, of one or more fatty acid alkyl esters corresponding to the following general formula. R.sup.1 COOR.sup.2 (I) in which R 1 is a straight-chain or branched, saturated or mono- or polyunsaturated C 9 -C 21 alkyl or alkenyl radical and R 2 is a straight-chain or branched C 1 -C 12 alkyl radical, and/or polyesters obtainable by reaction of di-, oligo- or poly-hydroxy compounds with carboxylic acids and/or distillation residues from the transesterification of native fatty acid esters and, optionally, other additives known for lubricating purposes in quantities of from 0 to 20% by weight, based on the total weight of the powder, and to the use of these powder-form additives in drilling fluids for oil well and mine drilling in quantities of from 0.01 to 5% by weight, based on the total weight of the drilling fluid.
Inventors
- 👤 Heinz Mueller
- 👤 Claus-Peter Herold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:06
CPC Classifications
C; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/06
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
185 words
A powder-form lubricant additive for water-based drilling fluids, consisting essentially of a. from about 95 to 30% by weight, based on the total weight of the powder, of a highly disperse silica having an average particle diameter of from about 5 to about 50 nm and a surface area of from about 50 to about 300 m 2 /g, and; b. from about 5 to about 70% by weight, based on the total weight of the powder, of one or more of i. fatty acid alkyl ester of the formula R.sup.1 COOR.sup.2 (I) in which R 1 is a straight-chain or branched, saturated or mono- or polyunsaturated C 9 -C 21 alkyl or alkenyl radical, and R 2 is a straight-chain or branched C 1 -C 12 alkyl radical, ii. a polyol ester obtained by reaction of a di- or poly-hydroxy compound with a carboxylic acid of the formula RCOOH (II) in which R is a straight-chain or branched, saturated or mono- or polyunsaturated C 5 -C 21 alkyl or alkenyl radical, and iii. a distillation residue from the transesterification of natural fatty acid esters.
Claim 2
Dependent Claim
185 words
A powder-form lubricant additive for water-based drilling fluids, consisting essentially of a. from about 95 to 30% by weight, based on the total weight of the powder, of a highly disperse silica having an average particle diameter of from about 5 to about 50 nm and a surface area of from about 50 to about 300 m 2 /g, and; b. from about 5 to about 70% by weight, based on the total weight of the powder, of one or more of i. fatty acid alkyl ester of the formula R.sup.1 COOR.sup.2 (I) in which R 1 is a straight-chain or branched, saturated or mono- or polyunsaturated C 9 -C 21 alkyl or alkenyl radical, and R 2 is a straight-chain or branched C 1 -C 12 alkyl radical, ii. a polyol ester obtained by reaction of a di- or poly-hydroxy compound with a carboxylic acid of the formula RCOOH (II) in which R is a straight-chain or branched, saturated or mono- or polyunsaturated C 5 -C 21 alkyl or alkenyl radical, and iii. a distillation residue from the transesterification of natural fatty acid esters.
Claim 3
Dependent Claim
20 words
The powder-form additive of claim 1 wherein component (a) is present in from about 60 to about 40% by weight.
Claim 4
Dependent Claim
20 words
The powder-form additive of claim 2 wherein component (b) is present in from about 40 to about 60% by weight.
Claim 5
Dependent Claim
29 words
The powder-form additive of claim 1 wherein up to 20% of one or more of a metal soap, a sulfurized fatty acid, and a blown oil is also present.
Claim 6
Dependent Claim
21 words
The powder-form additive of claim 4 wherein a metal soap is present and is aluminum stearate, calcium stearate or magnesium stearate.
Claim 7
Dependent Claim
21 words
The powder-form additive of claim 1 wherein in component (b)(i) the R 1 group contains from 11 to 17 carbon atoms.
Claim 8
Dependent Claim
22 words
The powder-form additive of claim 1 wherein component (b)(i) is a mixture of fatty acid alkyl esters from naturally occurring fatty acids.
Claim 9
Dependent Claim
23 words
The powder-form additive of claim 7 wherein the mixture of fatty and alkyl esters are obtained from cocosalkyl or tallow alkyl fatty acids.
Claim 10
Dependent Claim
21 words
The powder-form additive of claim 1 wherein in component (b)(i) the R 2 group contains from 1 to 8 carbon atoms.
Claim 11
Dependent Claim
17 words
The powder-form additive of claim 1 wherein the R 2 group is methyl, ethyl, n-propyl or i-propyl.
Claim 12
Dependent Claim
85 words
The powder-form additive of claim 1 wherein component (b)(ii) is one or more of a polyol ester obtained by the reaction of ethylene glycol, propylene glycol, glycerol, trimethylolethane, trimethylolpropane, pentaerythritol, sorbitol, polyols obtained by autocondensation of glycerol with elimination of water, or a reaction product of the above compounds with ethylene oxide and/or propylene oxide, with a carboxylic acid of the formula RCOOH (II) in which R is a straight-chain or branched, saturated or mono- or polyunsaturated C 5 -C 21 alkyl or alkenyl radical.
Claim 13
Dependent Claim
34 words
In water-based drilling fluid, the improvement comprising the presence therein of from about 0.01 to about 5% by weight, based on the total weight of drilling fluid, of the powder-form additive of claim 1.
Claim 14
Dependent Claim
23 words
The water-based drilling fluid of claim 12 in which the powder-form additive is present in from about 0.1 to about 2% by weight.
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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) | 1992-02-07 | 1992-08-08 | 1993-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-02-07 | 1996-08-08 | 1997-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-02-07 | 2000-08-08 | 2001-02-07 | $7700.00 | Window Closed / Lapsed |