Latex additive for water-based drilling fluids
US6715568B1 · kind B1 · utility
47Cited by
20References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 2, 2002 |
| Grant date | Apr 6, 2004 |
| Priority date | — |
| Expiry date | May 13, 2022 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/24
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The use of polymer latices is described for fluid loss control in water-based drilling fluids. The latices used are water insoluble. The latices are essentially non-swelling in an aqueous solution. The latices are selected from known latices such that they are absorbed within a filter cake building up at the interface between the wellbore and porous formations in essentially the same state as they are in the aqueous drilling fluid during circulation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.