Stabilized fracture fluid and crosslinker therefor
Patent 4780223 Issued on October 25, 1988. Estimated Expiration Date: 
November 10, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
November 10, 2006. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 2894966 2950174 3301723 3888312 Fracturing subterranean formation Crosslinking composition and method of preparation Method and compositions for fracturing subterranean formations Method and compositions for fracturing subterranean formations Patent #: 4477360 InventorsAssigneeApplicationNo. 06/929567 filed on 11/10/1986US Classes:507/244, Oxygen is attached directly or indirectly to carbon by nonionic bonding507/903, CROSSLINKED RESIN OR POLYMER507/922, FRACTURE FLUID556/6Nitrogen containing preservative or stabilizerExaminersPrimary: Guynn, Herbert B.Attorney, Agent or FirmInternational ClassesC09K 8/50 (20060101)C09K 8/512 (20060101) C09K 8/68 (20060101) C09K 8/60 (20060101) C08B 15/00 (20060101) C08B 37/00 (20060101) C08B 37/14 (20060101) AbstractVarious organometallic crosslinkers containing titanium or zirconium atoms in the +4 oxidation (valence) state have been used to crosslink solvatable polysaccharides (e.g., hydroxypropyl guar) in aqueous media. The crosslinked gels are useful as fracturing fluids. Aqueous solutions of the organometallic crosslinkers are stabilized against deterioration upon storage by adding an alkanolamine (e.g., triethanolamine). Additionally, the alkanolamines also stabilize the crosslinked gels against shear degradation at elevated temperatures. |
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