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ＣＭＡ（ＣｈｅｍｉｃａｌｌｙＭｏｄｉｆｉｅｄＡｃｉｄ）酸系统是指利用磷酸和氢氟酸匹配而形成的一种新的地层处理液系统，该系统１９９６年在成明顿（Ｗｉｌｍｉｎｇｔｏｎ）油田应用中取得较好增产效果。在ＣＭＡ系统中，有机磷酸对金属有很强的亲和力，即对粘土和长石等
The CMA (Acidically Modified Acid) acid system refers to a new formation treatment solution formed by the matching of phosphoric acid and hydrofluoric acid. The system achieved good yield increase in 1996 in the application of the Wilmington oil field. In CMA systems, organophosphates have a strong affinity for metals, ie for clays and feldspar