Patent ID: 7795190
Filing Date: 2010-09-14
Classification: C09K

Abstract:
1. A process for preparing a solution of a borozirconate complex suitable for cross-linking in a fracturing fluid comprises: (a) contacting a zirconium complex with an alkanolamine at a ratio of 2 to 10 moles of the alkanolamine per mole of zirconium to form a first mixture; (b) contacting the first mixture with water at a ratio of about 2 to 10 moles of water per mole of zirconium and with 0 to 2 moles of a hydroxyalkylene diamine per mole of zirconium to form a second mixture; (c) contacting the second mixture with 1 to 4 moles of a boron compound per mole of zirconium in an alcohol at a temperature of 25° C. to 90° C. for a period of time sufficient to stabilize the resulting borozirconate solution.