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中原文南油田低渗透油藏注水井近井、远井地带堵塞严重 ,注水压力过高 ,配注水量不能完成。为此 ,研制了一种缓速酸液用于解堵。该酸液的基本组成为 :一种商品混合酸液HS 1 ,含磷酸、硼酸等多种酸 ( 8% ) ;氯乙酸( 2 % ) ;一种商品强氧化剂HS 2 ( 1 2 % )及活化剂 ( 2 % )。室内性能测试结果表明 :该酸液具有良好的缓速性能 ;在地层内可长时间维持低 pH值 ( <2 ,60min) ,对地层伤害小 ;表面和界面张力低 (≤ 2 8.0和 <0 .4mN/m) ;由于加有特种表面活性剂 ,悬浮微小颗粒的能力很强 ;降解有机残渣的能力强 (Rs>85% ) ;腐蚀性符合要求 ;改善岩心渗透率能力强 ,穿透深度大。在文南油田 1 2口注水井实施解堵施工 1 2井次 ,工艺有效率 95% ,平均单井注水压力降低 3MPa ,平均有效期 >1 50天 ,平均单井增注 60 0 0m3。介绍了施工工艺程序和两口井的施工效果。
Central Plains Wennan Oilfield low permeability reservoir near well, far block serious blockage, injection pressure is too high, with the amount of water can not be completed. To this end, developed a retarded acid solution for plugging. The basic composition of the acid is as follows: a commercial mixed acid HS 1, various acids (8%) such as phosphoric acid and boric acid; chloroacetic acid (2%); HS 2 (12% Activator (2%). The results of laboratory tests show that the acid has a good retarder performance. It can maintain a low pH (<2, 60 min) in the formation for a long time, with less damage to the formation. The surface and interfacial tension are low (≤2 8.0 and <0 .4mN / m); due to the addition of special surfactants, the ability to suspend micro-particles is very strong; the ability to degrade organic residues is strong (Rs> 85%); corrosiveness meets the requirements; the ability to improve core permeability is strong and the penetration depth Big. In Wennan Oilfield, 12 wells were unblocked for 12 wells. The process efficiency was 95%. The average single-well water injection pressure was reduced by 3MPa. The average effective period was> 150 days. The average single well injection was 60,000 m3. The construction procedure and the construction effect of two wells are introduced.