Cement compositions comprising lignite grafted fluid loss control additives
US7388045B1 · kind B1 · utility
16Cited by
41References
14Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Jun 17, 2008 |
| Priority date | — |
| Expiry date | Feb 5, 2027 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02W30/91
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Novel well cement compositions are provided. Exemplary embodiments of the well cement compositions comprise water, a cement and a fluid loss control additive comprising a graft polymer. The graft polymer comprises a backbone comprising a lignite. The graft polymer further comprises grafted monomers selected from the group consisting of 2-acrylamido-2-methylpropanesulfonic acid, acrylamide, acrylic acid, vinylphosphonic acid, diallyldimethylammonium chloride and salts thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.