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    • 72. 发明授权
    • Filter cake degradation compositions and methods of use in subterranean operations
    • 滤饼降解组合物和地下操作中使用的方法
    • US07598208B2
    • 2009-10-06
    • US11435236
    • 2006-05-16
    • Bradley L. Todd
    • Bradley L. Todd
    • C09K8/536
    • C09K8/52
    • The present invention relates to methods and compositions for degrading filter cakes in subterranean formations, and more specifically, to improved methods and compositions for degrading filter cakes that comprise acid-soluble portions and polymeric portions. In one embodiment, the present invention provides a method of degrading a filter cake comprising an acid-soluble portion and a polymeric portion in a subterranean formation comprising the steps of: introducing a filter cake degradation composition comprising a delayed-release acid component and a delayed-release oxidizer component to a well bore penetrating the subterranean formation; allowing the delayed-release acid component to release an acid derivative and the delayed-release oxidizer component to release an acid-consuming component; allowing the acid-consuming component to interact with the acid derivative to delay a reaction between at least a portion of the acid derivative and at least a portion of the acid-soluble portion of the filter cake and to produce hydrogen peroxide; allowing the acid derivative to degrade at least a portion of the acid-soluble portion of the filter cake after a delay period; and allowing the hydrogen peroxide to degrade at least a portion of the polymeric portion of the filter cake.
    • 本发明涉及降解地层中的滤饼的方法和组合物,更具体地说,涉及降解包含酸溶性部分和聚合物部分的滤饼的改进方法和组合物。 在一个实施方案中,本发明提供了一种降解含有酸溶性部分和地层中聚合物部分的滤饼的方法,包括以下步骤:引入包含延迟释放酸组分和延迟释放酸组分的滤饼降解组合物 - 将氧化剂组分释放到穿透地层的井眼; 允许延迟释放的酸组分释放酸衍生物和延迟释放氧化剂组分以释放酸消耗组分; 允许酸消耗组分与酸衍生物相互作用以延迟酸衍生物的至少一部分与滤饼的酸溶性部分的至少一部分之间的反应并产生过氧化氢; 允许酸衍生物在延迟期后降解滤饼的酸溶性部分的至少一部分; 并且允许过氧化氢降解滤饼的聚合物部分的至少一部分。