On-the-fly control of delayed borate-crosslinking of fracturing fluids
US5877127A · kind A · utility
104Cited by
29References
26Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 1, 1996 |
| Grant date | Mar 2, 1999 |
| Priority date | — |
| Expiry date | May 1, 2016 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10S507/922
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A method is provided for controlling the delay time of aqueous borate-crosslinked polysaccharide-based fluids for hydraulic fracturing and related applications which allows on-the-fly control of the delay time without comprising overall fluid integrity. Without having to modify the total boron content nor pH of the fracturing fluid, the delay time is controlled by adding a polyol to the fracturing fluid at a first rate, determining the resulting delay time and then adjusting the rate of the polyol addition to the fracturing fluid until the desired delay time is achieved.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.