Patent US4802998A successfully refreshed from Google Patents.
US4802998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Powder-form lubricant additives for water-based drilling fluids
Assignee: Henkel AG and Co KGaA
•
Filing: 1987-07-08
•
Granted: 1989-02-07
•
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 20:15
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.
References Cited (Backward Citations)
CA578341A
Cited
US2862881A
Cited
US3047493A
Cited
US3027324A
Cited
US3047494A
Cited
US3480544A
Cited
US3840460A
Cited
US3761410A
Cited
US4212794A
Cited
US3810836A
Cited
US4064055A
Cited
US4409108A
Cited
US4356096A
Cited
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 |