C - Chemistry – Metallurgy – 07 – F
Patent
C - Chemistry, Metallurgy
07
F
166/22, 32/26, 2
C07F 7/00 (2006.01) C08B 11/20 (2006.01) C08B 37/14 (2006.01) C08K 5/00 (2006.01) C09K 8/68 (2006.01) E21B 43/22 (2006.01)
Patent
CA 1211042
ABSTRACT OF THE DISCLOSURE Novel aqueous crosslinked gels are described herein which are useful for fracturing subterranean formations. The novel gels are com- prised of a solvatable polysaccharide and a soluble zirconium crosslinking agent. The zirconium cross linking agents are novel and are prepared by reacting a zirconium alkoxide with certain alkanolamines under anhydrous conditions. The zirconium compounds are activated by contact with water. As an example, a zirconium crosslinker was prepared by reacting zir- conium tetra(n-propoxide) with triethanolamine in an n-propanol solvent under anhydrous conditions. The zirconium compound thus prepared was activated with water and used to form a stable aqueous crosslinked gel by blending the aqueous crosslinker into an aqueous hydroxypropylguar solution.
412974
Dowell Schlumberger Canada Inc.
Smart & Biggar
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