动电效应在生产测井中的应用方法研究

油田生产开发过程中动电效应普遍存在,其中的流动电位效应往往对自然电位及电阻率测井产生干扰作用。国外现场实验结果表明,通过井下电极能够获得由不稳定压力引起的电位异常信号,该信号与压力有很好的相关性,有助于提高裂缝流动的识别和近井含水饱和度的评价。根据耦合流动的基本原理,建立了均质地层生产井井底电位随压力的变化关系,并根据文献中岩石的电学性质,计算了电位信号随含水饱和度的变化。结果显示结合动电效应的生产测试方法具有提高井底附近储层及流体性质识别的潜力。

Study on Application Method in Production Logging by Electrokinetic

In petroleum development, electrokinetic effect exists widely during which the streaming potential effect would frequently disturb the result of SP and Resistivity Logging. Field practical abroad suggest that downhole electrode could record the obvious potential anomaly induced by transient well testing, this electrical signal vary with pressure simultaneously, and is helpful to identify fracture flow and water saturation evaluation. In the paper, we established the model of downhole electrical potential aviating with pressure in homogenous layer based on the coupling flow theory; then calculated the relation between SP and water saturation. The result shows electrokinetic effect data in production logging has the potential to improve reservoir and its fluid identification.