Methods of using reversible phase oil based drilling fluid
US6806233B2 · kind B2 · utility
33Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jun 22, 2001 |
| Grant date | Oct 19, 2004 |
| Priority date | — |
| Expiry date | Nov 2, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Invert emulsion compositions including an oleaginous, a non-oleaginous and an amine surfactant that are useful in the oil and gas well drilling art are disclosed. The amine surfactant is selected so that the invert emulsion can be converted form a water-in-oil type emulsion to a oil-in-water type emulsion upon the protonation of the amine surfactant. Deprotonation of the amine surfactant reverses the conversion. This solution also permits the conversion of oil-wet solids in the fluid into water-wet solids.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.