Inhibitive water-based drilling fluid system and method for drilling sands and other water-sensitive formations
US7439210B2 · kind B2 · utility
4Cited by
22References
50Claims
0Family size
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Key dates
| Filing date | Apr 24, 2004 |
| Grant date | Oct 21, 2008 |
| Priority date | — |
| Expiry date | Mar 15, 2025 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/925
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
An inhibitive water-based polymer mud system and method for using the system in drilling and in stabilizing wellbores is disclosed for use in water sensitive formations as an alternative to oil-based muds. The system comprises a non-ionic low molecular weight polyacrylamide in combination with a non-ionic high molecular weight polyacrylamide, preferably long chain alcohol and poly anionic cellulose.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.