Filtration control agent and a drilling fluid containing the same
US9243180B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Sep 26, 2012 |
| Grant date | Jan 26, 2016 |
| Priority date | — |
| Expiry date | Dec 28, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/203
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention provides a filtration control agent and a drilling fluid containing the same. The filtration control agent comprises the product obtained from the reaction of water, lignite, aldehyde and sulfonate polymer at 180-220° C. and the units containing sulfonate groups in the molecular chains of sulfonate polymer are at least 30 wt %. The filtration control agent provided by the present invention features a good filtration loss reduction effect and a low viscosity effect and can improve the rheological behavior of the drilling fluid, thereby meeting the requirements of the drilling of deep wells, ultra-deep wells and ultra high pressure formations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.