Additive to improve cold temperature properties in oil-based fluids
US11584876B2 · kind B2 · utility
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11References
12Claims
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Key dates
| Filing date | Feb 26, 2018 |
| Grant date | Feb 21, 2023 |
| Priority date | — |
| Expiry date | Mar 27, 2039 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/062
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
An additive composition includes a rheology modifier selected from alcohol ethoxylates, amine ethoxylates, or ethylene oxide/propylene oxide copolymers, wherein the rheology modifier has an HLB ranging from about 4 to 10; and a winterizing agent that is at least one aliphatic non-ionic surfactant that has a branched structure and/or includes at least one unsaturation, wherein the winterizing agent has an HLB value between about 8 and 10.5.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.