Methods and materials to enhance high temperature rheology in invert emulsions
US9346995B2 · kind B2 · utility
9Cited by
7References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 9, 2012 |
| Grant date | May 24, 2016 |
| Priority date | — |
| Expiry date | Jan 18, 2034 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B7/00
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An invert emulsion drilling fluid, and a method of drilling with such fluid, having improved rheology at low mud weights and high temperatures. The improved rheology is effected with addition of a rheology additive of the invention comprising fatty dimer diamines or dimer diamines and an organic acid or ester of the acid. A nonlimiting example of such a rheology additive comprises a C36 fatty dimer diamine and adipic acid or dimethyl adipate.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.