Fluid loss control additives for oil-based well-working fluids
US4671883A · kind A · utility
97Cited by
12References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 12, 1985 |
| Grant date | Jun 9, 1987 |
| Priority date | — |
| Expiry date | Jul 12, 2005 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/926
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Fluid loss control additives for oil-based well-working fluids comprise a solubilized lignite derivative and an oil-swellable or oil-soluble polymer. The solubilized lignite derivative may be oil-solubilized (e.g. a lignite/amine complex) or water-solubilized (e.g. causticized lignite) and may be incorporated in a polymer matrix or added to a dispersion of a polymer in an aqueous medium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.