Fluid loss additives and methods
US7422061B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2005 |
| Grant date | Sep 9, 2008 |
| Priority date | — |
| Expiry date | Aug 30, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC04B2111/00146
- WIPO fieldMaterials, metallurgy
- WIPO sectorChemistry
Abstract
Nonionic derivatized starch of varying degrees of substitution may be used as a fluid loss additive for well bore cementing operations. A well bore cementing composition may include a cement and a nonionic derivatized starch, the nonionic derivatized starch in a concentration in the cement to provide a fluid loss of less than 200 cc/30 min. A method for cementing subterranean zones penetrated by a well bore may include: providing a cement slurry including mix water, hydraulic cement and a nonionic derivatized starch as an additive for fluid loss control in well cementing applications; pumping the cement slurry into a well; and holding the cement slurry in place until it sets.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.