Method of removing an invert emulsion filter cake after the drilling process using a single phase microemulsion
US7687439B2 · kind B2 · utility
54Cited by
12References
13Claims
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Key dates
| Filing date | Oct 2, 2006 |
| Grant date | Mar 30, 2010 |
| Priority date | — |
| Expiry date | Sep 10, 2028 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/929
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Single phase microemulsions improve the removal of filter cakes formed during drilling with invert emulsions. The single phase microemulsion removes oil and solids from the deposited filter cake. Optionally, an acid capable of solubilizing the filter cake bridging particles may also be used with the microemulsion. In one non-limiting embodiment the acid may be a polyamino carboxylic acid. Skin damage removal from internal and external filter cake deposition can be reduced.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.