塔河奥陶系6000m~3超大规模酸压实践

针对塔河油田奥陶系碳酸盐岩缝洞型油藏常规酸压存在酸蚀裂缝距离短,导流能力有限,难以沟通远处有效储集体的问题,在TH12312井探索并实践大幅增加酸压液体用量及施工排量的6000m3超大规模酸压工艺技术。优选方案为滑溜水4000m3,施工排量≥7.0m3/min;变黏酸600m3,施工排量≥7.5m3/min;胶凝酸400m3,施工排量≥7.5m3/min;顶替液:滑溜水1000m3,施工排量≥7.0m3/min。动态缝长可达到289.9m,动态缝高可达到77m,酸蚀缝长可达到227m,导流能力可达到426mD·m。整个施工过程交替注入滑溜水和酸液,累计注入总液量6008m3,同时加入粉陶70t,最高泵压达到94.3MPa,最高排量8.5m3/min,酸压施工获得成功。酸压时的裂缝监测及后期生产效果评价表明,该工艺取得了提高造缝长度、改善储层导流能力、沟通远处储集体的效果,刷新了酸压规模的世界纪录。

Acid Fracturing Practice at 6000m~3 Very Large Scale in Ordovician System of Tahe Oilfield

Normal acid fracturing in fracture-cavity carbonate reservoir in Ordovician system of Tahe oilfield has the problems of short etched fracture distance,finite conductivity and being difficult to link up the effective reservoir far away.So acid fracturing process at 6000m3 very large scale is applied in TH12312 well with incremental fluid volume and operating delivery rate.The optimized scheme is:4000m3 of displacement fluid and more than 7.0m3/min of operating delivery rate;600m3 of self-diverting acid and m...