Method and fluid for checking the saturation of a formation in the immediate vicinity of a well
US6740625B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Jul 28, 2000 |
| Grant date | May 25, 2004 |
| Priority date | — |
| Expiry date | Aug 17, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/06
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method and a fluid for drilling or intervening in a well passing through a porous, permeable formation, wherein a water-based well fluid is circulating in said well. In this method, there is added to the fluid not only the conventional ingredients for such a fluid but also a maximum of 10 wt. % of a composition obtained from a grease or oil and an alcohol, with the chain lengths of the acid and alcohol parts being chosen such that the ester thus obtained has sufficient dispersion in water, compatibility with said ingredients, does not form an emulsion with the reservoir oil, and adsorbs sufficiently on the porous formation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.