Method of using lignite grafted fluid loss control additives in cementing operations
US7360598B1 · kind B1 · utility
13Cited by
40References
18Claims
0Family size
Assignee
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Key dates
| Filing date | Feb 5, 2007 |
| Grant date | Apr 22, 2008 |
| Priority date | — |
| Expiry date | Feb 5, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2103/46
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Methods of cementing in a subterranean formation are provided. An exemplary embodiment comprises introducing a cement composition into a subterranean formation. The cement composition comprises 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.