Microemulsion or in-situ microemulsion for releasing stuck pipe
US8091644B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2008 |
| Grant date | Jan 10, 2012 |
| Priority date | — |
| Expiry date | Sep 5, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/02
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Nanoemulsion, macroemulsions, miniemulsions, microemulsion systems with excess oil or water or both (Winsor I, II or III phase behavior) or single phase microemulsions (Winsor IV) improve the removal of filter cakes formed during hydrocarbon reservoir wellbore drilling with OBM. Such filter cakes and their particles can contact, impact and affect the movement of the drill string undesirably resulting in a “stuck pipe” condition. The macroemulsion, nanoemulsion, miniemulsion, microemulsion systems with excess oil or water or both or single phase microemulsion removes oil and solids from the filter cake, thereby releasing the drill string from its stuck condition. In one non-limiting embodiment, the emulsion system may be formed in situ (downhole) rather than produced or prepared in advance and pumped downhole.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.