Method and fluid for controlling the saturation of a formation around a well
US7238647B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Jun 25, 2001 |
| Grant date | Jul 3, 2007 |
| Priority date | — |
| Expiry date | Dec 26, 2021 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/22
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a method and to a fluid for drilling or workover in a well running through a porous permeable formation, wherein a water-based well fluid circulates in said well. In the method, at most 3% by weight of a composition obtained from fat, or an oil, and an alcohol, is added to the fluid in addition to the conventional constituents for such a fluid, 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 constituents, 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.