中东M油田碳酸盐岩储层酸液体系研究及应用

中东地区M油田主力开发层系为中高孔中低渗的孔隙-裂缝型碳酸盐岩油藏，酸化是储层改造的主要技术手段。由于储层裂缝溶洞发育，非均质性强，酸液滤失量大，作用距离有限，需要结合缓速及暂堵转向技术，实现对非均质储层的深度处理。针对该油田储层特征，对目前碳酸盐岩主要缓速酸液体系（胶凝酸、转向酸、交联酸、乳化酸和螯合酸）性能进行了综合评价对比，优选转向酸体系。转向酸体系在现场累计应用30余井次，作业后单井平均增油量逾200 m3/d，增产效果显著。

Study and Application of Carbonate Acid System of M Oilfield in Middle East

The main pay zone of M oilfield in Middle East is a carbonate reservoir with middle-high porosity and low permeability. Acidizing is the main technique for carbonate stimulation. Abundant fissure-caverns lead to strong heterogeneity, large amount of acid filtration loss and limited acting distance of acidizing treatment. It is necessary to combine the techniques of slow speed and temporary blocking to increase acidizing depth of heterogeneous reservoirs. Aiming at the reservoir characteristics of the oilfield, this paper evaluated and comprehensively compared the properties of the main retarded acid systems (gelling acid, diverting acid, crosslinking acid, emulsifying acid and chelating acid) of the carbonate rocks, and preferred the diverting acid system. The diverting acid system has been applied to more than 30 wells in this oilfield. After operation, the average oil rate increase of each well is 200 m3/d, and the stimulation effect is remarkable.