协同转向酸化技术在让纳若尔油田的应用

让纳若尔油田射孔跨度大,射孔段数多,层间差异大,产液剖面不均匀,为了提高均匀酸化程度,改善产液剖面,增加低渗层动用程度,进行了具有暂堵转向、选择性酸化性能的多种酸液体系研究。根据油田储层岩性和物性特征,确定了与储层配伍性较好且具有暂堵、转向、低伤害、深度酸化功能的3种酸液体系,并对其性能进行了室内测试。同时,为了充分发挥各种酸液体系的优势,使其达到协同作用的目的,使用了清洁自转向—泡沫复合酸化技术和清洁自转向酸—乳化复合酸化技术。现场应用表明,施工成功率高,增产效果明显,具有较好的应用前景。

Synergitic diverted acidizing and its application in Zanazour oilfield

In Zanazour oilfield, wells feature long perforation interval, multiple perforation stages, large difference between layers and uneven production profile. In order to acidize uniformly, improve oil production profile and increase the producing degree of low permeability layers, selective acid systems, which can temporary block high-permeability layers and divert acid to low-permeability layers, have been researched and used in Kazakhstan Zanazour oilfield carbonate reservoirs. First, according to the reservoir, lithology and physical properties of this oilfield, three acid systems were chosen as the main acid, which have better blocking, diversion and low damage and good compatibility with the reservoir. Besides, their performances have been evaluated by experimental tests. Furthermore, selective foam acidizing and self diverting-emulsified acid system were utilized to achieve synergy diverting and better uniformity of acidizing, speed up flowing back rate and increase acidizing penetration depth. Field application results show that the technology can increase production significantly, and have a promising application prospect in this field.