Buffered well fluids
US6499546B1 · kind B1 · utility
8Cited by
4References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 20, 2001 |
| Grant date | Dec 31, 2002 |
| Priority date | — |
| Expiry date | Jul 20, 2021 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/068
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
The present invention relates to the use of a buffered acid wash to reduce the amount of oil in cuttings associated with the use of an invert emulsion well fluid. The buffered acid wash is sufficiently acidic as to convert all of the surfactant in the invert oil emulsion from one charge species into another, but substantially prevents the fluid from becoming so acidic as to generate carbon dioxide.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.