摘要
针对安塞油田油井含水率猛长,产油量下跌的现实,选用聚丙烯酰胺(简称PHMP)进行微观模型化学堵水实验。模型用含油岩芯处理磨制加工而成,旨在保持储层孔隙结构的真实性。实验表明采用PHMP化学堵剂堵水对裂缝具明显的封堵效果,其封堵过程为:吸附水膜→动力捕集→物理堵塞→粘弹封堵。结合安塞油田特低渗储层的特点,应选择低浓度的化学堵剂,以20%～40%为宜,旨在避免浓度过大堵塞部分油的渗流通道。
Abstract
PHMP was used in chemical water-shutoff test of chang-6 reservoir micromodel of Ansai Oilfield.The micromodel was made of grinded oil rock cores so as to keep the reservoir pore texture. Test result indicates that using PHMP as plugging agent in chemical water-shutoff could get evident effect. The plugging process is as follow:absorbed water film→ dynamic trapping →physical plugging→viscoelastic plugging. According to the ultralow permeability of the reservoir, its better to chose low density of plugging agent in the study area.The best ones are those with density between 20%～40%.
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