Patent ID: 8450248
Filing Date: 2013-05-28
Classification: C09K

Abstract:
1. A method for fracturing a formation accessible through a wellbore, the method comprising: providing a fracturing fluid including a viscosifying polysaccharide, 0.4 and 10 kg/m 3 of colemanite as a sole source of borate for crosslinking the viscosifying polysaccharide, and an effective amount of a metal sequestering agent including a chelating agent for chelating with calcium to viscosify the fracturing fluid 30 to 300 seconds after mixing the viscosifying polysaccharide, the colemanite and the metal sequestering agent; introducing the fracturing fluid to the wellbore to contact the formation; and pumping the fracturing fluid to induce and propagate a fracture in the formation.