Invert emulsion drilling fluids and muds having negative alkalinity and elastomer compatibility
US6589917B2 · kind B2 · utility
39Cited by
30References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 20, 2000 |
| Grant date | Jul 8, 2003 |
| Priority date | — |
| Expiry date | Apr 2, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/068
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An invert emulsion suitable for drilling subterranean wells, in particular oil and gas wells is disclosed which has negative alkalinity and includes an oleaginous phase, and a non-oleaginous phase and an emulsifying agent which stabilizes the invert emulsion under conditions of negative alkalinity. The practice of the present invention permits the formulation of drilling fluids which are absent an alkaline reserve and are compatible with elastomers utilized in drilling equipment. Thus the invert emulsion fluids of the present invention are highly suitable for drilling oil and gas wells.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.