Fluid loss control additives and subterranean treatment fluids containing the same
US6180571A · kind A · utility
12Cited by
15References
28Claims
0Family size
Assignees
Inventors
Key dates
| Filing date | Jul 28, 1997 |
| Grant date | Jan 30, 2001 |
| Priority date | — |
| Expiry date | Jul 28, 2017 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/08
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Selectively cross-linked starches are disclosed that are useful as fluid loss control additives in subterranean treatment fluids comprising starches that are cross-linked to a Brabender peak viscosity of about 800 to about 1250 Brabender units after about 40 to about 70 minutes at about 92.degree. C. and provide good fluid loss control over a temperature range of from about 20.degree. C. to about 160.degree. C. (68.degree. F. to 320.degree. F.).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.