桥口油田注水难原因及增注措施选择

针对油田油层本身的地质因素 ,如孔隙喉道小、地层温度高、黏土含量少以及注入水水质条件的限制 ,逐渐形成了注水井注水压力高 ,注水量小等弊病 ,分析了注入水的水质及在油层部位形成Ca CO3 与堵塞物的情况 .在 5 0 - 3井中采取高能气体压裂与 PCT复合处理措施 ,总结了各种措施的效果 .结果表明 :采用高能气体在注水层部位形成多条径向裂孔等能更好地沟通水井与地层的联系 ,如 :PCT处理液把油层的黏土缩膨、扩大空隙度和渗透率 ,在生产中均为有效 .

Analysis of Difficult Water-injection Causes and Selection of Injection-increasing Means in Qiaokou Oilfield

The geological characteristics and present development status of the oilfield are analyzed. It is held that the factors of influencing water injection pressure and volume are mainly geological feature of the oilfield and the quality of injected water, such as low porosity, low permeability and serious heterogeneity of the reservoir, intrastratal fouling, solid plugging and bacterial plugging. The results of the present injection increasing means are analyzed, and some physic chemical integrated approaches are suggested. It is also suggested that a fine filter should be installed at wellhead.