低渗透酸敏性地层酸化技术研究

Acidization Technique Used in Low Permeability Acid-sensitive Formation

针对某特低渗酸敏性储层,开展酸敏性评价,选择主体酸,通过添加表面活性剂、缓速剂、有机酸、无机酸及其盐类进行酸的反应和传递调整,选择适合的酸液体系;岩心模拟试验表明,所研究的FAB酸化效果较好,穿透能力较强,酸化后第一段岩心地层水测渗透率为酸化前的10.2倍,第二段岩心地层水测渗透率为酸化前的1.77倍,第三段岩心地层水测渗透率为酸化前的1.28倍。2005年至2007年FAB酸化共实施15口,措施有效率100%,累计增油8765t。

In allusion to an acid-sensitive reservoir,its acid sensitivity was evaluated and principal acid was chosen,acid reaction and delivery adjustment were carried out by using surfactant,corrosion inhibitor,organic and inorganic acids and salts.Core simulation test shows that studied FAB has a good acidization effect with strong penetration capacity,after acidization the permeability of formation water of the 1st section of core is 10.2 times,of the 2nd section of core is 1.77 times,in the 3rd section of core is 1.28 times higher than that of before acidication.From 2005 to 2007 FAB had been used for acidization in 15 wells with effectiveness of 100% and accumulated oil increment of 8765t.