Invert emulsion drilling fluids comprising quaternary ammonium emulsifiers and argillaceous solids and methods of drilling boreholes
US7939470B1 · kind B1 · utility
32Cited by
7References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 27, 2010 |
| Grant date | May 10, 2011 |
| Priority date | — |
| Expiry date | Mar 27, 2030 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/36
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An invert emulsion drilling fluid, and a method for the use thereof in drilling wellbores, with good rheological properties at high temperatures and pressures. One embodiment of the drilling fluids are free of organophilic clays and lignites, free of calcium chloride, and comprise an alcohol in the internal phase, a quaternary ammonium emulsifier, and argillaceous solids. In one embodiment, the alcohol is a glycerol, a polyglycerol, or a mixture thereof. In one embodiment, the base oil for the emulsion is a paraffin and/or mineral oil. The drilling fluids provide good lubricity and high rates of penetration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.