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    • 5. 发明授权
    • Cleanup additive
    • 清洁添加剂
    • US06242390B1
    • 2001-06-05
    • US09127023
    • 1998-07-31
    • Thomas O. MitchellRoger J. CardArthur Gomtsyan
    • Thomas O. MitchellRoger J. CardArthur Gomtsyan
    • C09K300
    • C09K8/685Y10S507/922
    • According to the present invention, a composition and method for hydraulically fracturing a subterranean formation is provided. The composition comprises an aqueous mixture of a hydrated polysaccharide, preferably a galactomannan gum, the hydrated polysaccharide having a plurality of bonding sites; a crosslinking agent for crosslinking the hydrated polysaccharide at the bonding sites at the conditions of the subterranean formation with a polyvalent metal ion to form a polyvalent metal crosslink, thereby increasing the viscosity of the hydrated polysaccharide; and a controlled solubility compound for releasing a chelating agent for controllably breaking the polyvalent metal crosslink and bonding with the polyvalent metal ion released by breaking the crosslink, thereby decreasing the viscosity of the hydrated polysaccharide. The method comprises the steps of injecting the above-described composition into the subterranean formation at fracturing pressures; allowing the controlled solubility compound to begin breaking the polyvalent metal crosslink, thereby reducing the viscosity of the hydrated polysaccharide and yielding a lower viscosity fluid; and removing the lower viscosity fluid from the subterranean formation.
    • 根据本发明,提供了一种用于水下压裂地层的组合物和方法。 该组合物包含水合多糖,优选半乳甘露聚糖胶的水性混合物,所述水合多糖具有多个结合位点; 交联剂,用于在多层金属离子的地下条件下在结合位置处交联水合多糖以形成多价金属交联,从而提高水合多糖的粘度; 以及用于释放螯合剂以控制性地破坏多价金属交联并与通过断裂交联而释放的多价金属离子键合的受控溶解性化合物,从而降低水合多糖的粘度。 该方法包括以下步骤:在压裂压力下将上述组合物注入地层; 允许受控溶解度化合物开始破坏多价金属交联,从而降低水合多糖的粘度并产生较低粘度的流体; 以及从地层中去除较低粘度的流体。