High temperature hydraulic fracturing fluid
US6227295A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 8, 1999 |
| Grant date | May 8, 2001 |
| Priority date | — |
| Expiry date | Oct 8, 2019 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/922
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A fluid that is useful in stimulation operations, and in particular, in hydraulic fracturing treatments, comprises a carrier fluid; a solvatable, crosslinkable polymer; a cross-linking agent that does not cause substantial cross-linking of the polymer at temperatures less than about 105.degree. F. and a pH of about 10 or greater; and an organic amine stabilizing agent that has a first pK.sub.a or a pH in water of at least about 9.5. One group of such amines has the formula EQU H.sub.2 N--(R.sub.1 NH).sub.n --H where R.sub.1 is C.sub.1 -C.sub.4 alkyl and n is from 1-6. In one embodiment, the cross-linking agent is an organic zirconate, such as bis(hydroxyethyl)glycine zirconate. The organic zirconate is effective to cross-link the polymer when the composition is at a temperature of at least about 105.degree. F., and a pH of about 10 or higher, preferably a pH in the range of about 10.5-12.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.