US3920559A
Expired / Lapsed
US
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Composition and process for defoaming aqueous drilling fluids
Assignee: Milchem Inc
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Filing: 1974-02-19
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Granted: 1975-11-18
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Expires: 1994-02-19
Abstract
Abstract A composition and process for defoaming aqueous drilling fluids wherein a synergistic defoamer is produced by the combination of a propylene oxide adduct of oleyl alcohol together with a polyvalent metal salt of stearic acid.
Inventors
- 👤 Katherine Anne Cline Elting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:31
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/18; B; B01; B01D; B01D19/00; B01D19/02; B01D19/04; B01D19/0404; C09; C09K; C09K8/00; C09K8/02; C09K8/04; C09K8/14; C09K8/18; C09K8/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
68 words
A PROCESS FOR INHIBITING FOAMING IN AN AQUEOUS DRILLING FLUID HAVING A TENDENCY TO FOAM, SAID PROCESS COMPRISING ADDING TO SAID FLUID A FOAM INHIBITING AMOUNT OF PROPYLENE OXIDE ADDUCT OF OLEYL ALCOHOL AND A POLYVALENT METAL SALT OF STEARIC ACID, SAID SALT BEING A MEMBER SELECTED FROM THE CLASS CONSISTING OF ALUMINUM, CALCIUM, ZINC AND IRON, THE MOLE RATIO OF PROPYLENE OXIDE TO ALCOHOL BEING ABOUT 20-TO-1.
Claim 2
Dependent Claim
68 words
A PROCESS FOR INHIBITING FOAMING IN AN AQUEOUS DRILLING FLUID HAVING A TENDENCY TO FOAM, SAID PROCESS COMPRISING ADDING TO SAID FLUID A FOAM INHIBITING AMOUNT OF PROPYLENE OXIDE ADDUCT OF OLEYL ALCOHOL AND A POLYVALENT METAL SALT OF STEARIC ACID, SAID SALT BEING A MEMBER SELECTED FROM THE CLASS CONSISTING OF ALUMINUM, CALCIUM, ZINC AND IRON, THE MOLE RATIO OF PROPYLENE OXIDE TO ALCOHOL BEING ABOUT 20-TO-1.
Claim 3
Dependent Claim
50 words
An aqueous drilling fluid defoamer consisting essentially of a propylene oxide adduct of oleyl alcohol and a polyvalent metal salt of stearic acid, said salt being a member selected from the class consisting of aluminum, calcium, zinc and iron, the mole ratio of propylene oxide to alcohol being about 20-to-1.
Claim 4
Dependent Claim
50 words
An aqueous drilling fluid defoamer consisting essentially of a propylene oxide adduct of oleyl alcohol and a polyvalent metal salt of stearic acid, said salt being a member selected from the class consisting of aluminum, calcium, zinc and iron, the mole ratio of propylene oxide to alcohol being about 20-to-1.
Claim 5
Dependent Claim
16 words
The process of claim 1 wherein the polyvalent metal salt of stearic acid is aluminum stearate.
Claim 6
Dependent Claim
16 words
The defoamer of claim 2 wherein the polyvalent metal salt of stearic acid is aluminum stearate.
Claim 7
Dependent Claim
18 words
The process of claim 1 wherein the foam inhibiting amount is from between about 10 and 5,000 p.p.m.
References Cited (Backward Citations)
US1947725A
Cited
US2575298A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-11-17 | 1979-05-19 | 1979-11-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-11-17 | 1983-05-19 | 1983-11-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-11-17 | 1987-05-19 | 1987-11-18 | $7700.00 | Window Closed / Lapsed |