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发明公开
CN105950126A 一种酸化解堵用延迟控释酸及其制备方法，酸化解堵方法 无效 - 驳回

一种酸化解堵用延迟控释酸及其制备方法，酸化解堵方法
摘要：
本发明公开了一种酸化解堵用延迟控释酸及其制备方法，酸化解堵方法。该延迟控释酸，由以下重量百分比的组分组成：5～20％丙酸丙酯，2～8％甲酸异戊酯，2～8％甲酸甲酯，0.006％羧酸酯酶，0.1～1％助排剂，0.5～3％氯化铵，0～8％氟化氢铵，余量为水。本发明提供的延迟控释酸，由丙酸丙酯、甲酸异戊酯、甲酸甲酯组成生酸前体，在羧酸酯酶的作用下催化上述生酸前体产生H+，反应时间可控；H+与氟化氢铵中的F‑结合生成HF酸，可有效改善地层结构，在不腐蚀油井设备的基础上，达到对地层解堵改造的目的。
摘要（英）：

The invention discloses delaying controlled-release acid for acidizing unblocking, a preparation method of the acid and an acidizing unblocking method. The delaying controlled-release acid is prepared from components in percentage by weight as follows: 5%-20% of propyl propanoate, 2%-8% of isoamyl formate, 2%-8% of methyl formate, 0.006% of carboxylesterase, 0.1%-1% of a discharge aiding agent, 0.5%-3% of ammonium chloride, 0-8% of ammonium hydrogen fluoride and the balance of water. According to the delaying controlled-release acid, an acid producing precursor is formed by propyl propanoate, isoamyl formate and methyl formate and catalyzed under the action of carboxylesterase to generate H<+>, and the reaction time is controllable; H<+> is combined with F<-> in ammonium hydrogen fluoride to generate HF acid, the stratum structure can be effectively improved, and the purpose of unblocking and reconstructing the stratum is achieved on the basis that oil well equipment is free of corrosion.

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