C - Chemistry – Metallurgy – 09 – K
Patent
C - Chemistry, Metallurgy
09
K
C09K 8/04 (2006.01) C08K 3/38 (2006.01) C08K 5/09 (2006.01) C08L 5/00 (2006.01) E21B 43/26 (2006.01)
Patent
CA 2570953
A fluid for fracturing subterranean formations and method of use are disclosed. The fracturing fluid is comprised of a polymer (guar gum or a guar derivative) as a gelling agent, a pH adjusting reagent, a delayed borate cross- linking agent (sparingly soluble borate minerals), and a high pH buffer. The fracturing fluid, upon mixture, initially has a low pH for optimal rapid hydration of the polymer (and the borate remains idle), allows for low tubular friction pressure due to the low viscosity. However, the fracturing fluid allows for a slow, continuous pH shift from the low pH to a higher pH, where the borate ion exists and is available to cross-link and cause gelling of the polymer.
O'neil Bill
Walker Brian
Stikeman Elliott Llp
Trican Well Service Ltd.
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