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发明公开
CN104804718A 油田注水井用缓释型固体酸及其制备方法 无效 - 撤回

油田注水井用缓释型固体酸及其制备方法
摘要：
本发明公开了一种油田注水井用缓释型固体酸，由以下重量百分比的组分制成：20～40％的缓释材料、55～75％的水溶性粉末酸以及5～10％的粘合剂。本发明还提供了该缓释型固体酸的制备方法。所述缓释型固体酸与水接触后，缓释材料可逐步水合形成凝胶，之后缓慢解缠、溶蚀，使内部的水溶性粉末酸与水逐步接触并缓慢溶解，由此达到较好的缓释效果，使酸性得到持久均匀地释放，从而在相对较长的时间内保证储层水呈弱酸性，起到防垢、降低注水压力以及延长增注周期的作用。另外，所述缓释型固体酸的投放方法简单便捷，不需要专业的井下作业队，有效降低了施工过程中的人力、物力消耗。
摘要（英）：

The invention discloses a sustained-release solid acid for water injection wells in oil fields. The sustained-release solid acid is prepared from the following components in percentage by weight: 20-40% of sustained-release material, 55-75% of water-soluble acid powder, and 5-10% of a bonding agent. The invention further provides a preparation method of the sustained-release solid acid. After the sustained-release solid acid is in contact with water, the sustained-release material can gradually hydrate so as to form gel, and then the gel is slowly untwisted and corroded, so that the internal water-soluble acid powder is gradually in contact with water and is slowly dissolved; therefore, a better sustained-release effect is achieved, the acidity can be enduringly and uniformly released, the reservoir water can be guaranteed to be mildly acidic in a relative long time, and the effects of preventing scale, lowering water injecting pressure and prolonging injection-increase periods are achieved; in addition, the adding method of the sustained-release solid acid is simple and convenient, and professional down-hole operation groups are not needed, so that the consumption of manpower and material resources during construction is effectively reduced.

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