Methods for crosslinking water soluble polymers for use in well applications
US8932998B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 5, 2009 |
| Grant date | Jan 13, 2015 |
| Priority date | — |
| Expiry date | Apr 7, 2033 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K8/90
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A method for forming a well and pipeline treating fluid is provided. The method comprises combining a cross-linkable gelling polymer, a scavenging compound capable of reducing a concentration of divalent and polyvalent metal ions and salts thereof available for reaction, a hydration solvent and optionally an acid. The resulting mixture has a pH ranging from about 3 to about 7 and a first viscosity. The mixture is maintained at conditions suitable for hydration of the cross-linkable gelling polymer until the mixture has a second viscosity that is greater than the first viscosity. The mixture is combined with an aqueous based fluid and at least one cross-linking agent. The pH of the mixture is raised to a sufficient level to allow a desired degree of cross-linking to occur. Other methods, a well and pipeline treating gel and a well and pipeline treating fluid are also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.