Drilling fluids
US6518224B2 · kind B2 · utility
104Cited by
13References
14Claims
0Family size
Inventor
Key dates
| Filing date | Jan 23, 2001 |
| Grant date | Feb 11, 2003 |
| Priority date | — |
| Expiry date | Jan 23, 2021 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/903
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The invention is a novel drilling fluid additive comprising particles of elastomer which are capable of swelling upon contact with a hydrocarbon fluid. The swelling of the elastomer is gradual, allowing the elastomer to reach the lost circulation zone before significant swelling occurs. Once in the lost circulation zone, the polymer expands sealing off the lost circulation zone. A method for preventing drilling fluid loss is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.