Method for removing filtercake
US6143698A · kind A · utility
139Cited by
27References
20Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 4, 1998 |
| Grant date | Nov 7, 2000 |
| Priority date | — |
| Expiry date | Dec 4, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K2208/18
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for removing filtercake from a subterranean borehole comprising drilling the borehole with a drilling fluid that includes additives to form a filtercake having an oxidation-degradable component, preferably a polysaccharide. The filtercake is contacted with a clear brine containing bromine or bromate generating agents to degrade the polymers within the filtercake. The brine contains bromide salts and an oxidant capable of delayed oxidation of the bromide to bromine at downhole conditions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.