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    • 29. 发明授权
    • Aqueous gels for plugging fractures in subterranean formation and
production of said aqueous gels
    • 含水凝胶用于堵塞地层中的裂缝并生产所述含水凝胶
    • US3955998A
    • 1976-05-11
    • US489749
    • 1974-07-18
    • Richard L. ClampittJames E. Hessert
    • Richard L. ClampittJames E. Hessert
    • B01J19/06C09K8/14C09K8/20C09K8/588C09K8/68C09K8/72E21B43/26C08L1/26
    • C09K8/80B01J19/06C09K8/588C09K8/68C09K8/72E21B43/261
    • Aqueous gels suitable for plugging fractures in subterranean formations are produced by (1) thickening water by incorporating therein a thickening amount of a water-soluble cellulose ether (e.g.,CMC), (2) incorporating a water-soluble compound of a polyvalent metal (e.g., sodium or potassium dichromate) wherein the valence state of the metal therein is capable of being reduced to a lower polyvalent valence state, in an amount sufficient to cause gelation when the valence of at least a portion of said metal is reduced to said lower valence state, (3) incorporating a water-soluble reducing agent (e.g., a sulfite, hydrosulfite, metabisulfite or thiosulfate of sodium or potassium, sodium sulfide, hydrogen sulfide or mixtures thereof) in an amount effective to reduce at least a portion of said metal to said lower valence state and cause gelation, and (4) incorporating a finely divided solid (e.g., diatomaceous earth) in an amount sufficient to cause an increase in gel strength.
    • 通过(1)通过在其中加入增稠量的水溶性纤维素醚(例如CMC)来增稠水,(2)加入多价金属的水溶性化合物(...),制备适用于在地层中堵塞裂缝的水性凝胶 例如重铬酸钠或重铬酸钾),其中其中金属的价态能够被还原成较低的多价价态,其量足以引起凝胶化,当所述金属的至少一部分的价态降低到所述低价位 价态,(3)将有效量的至少一部分的水溶性还原剂(例如亚硫酸盐,连二亚硫酸盐,亚硫酸钠,亚硫酸氢盐或亚硫酸钠或硫代硫酸钠,硫化钠,硫化氢或其混合物) 金属化为所述低价态并引起凝胶化,和(4)以足以引起凝胶强度增加的量掺入细碎的固体(例如,硅藻土)。