低渗透砂岩油藏渗吸规律研究

随着越来越多的低渗透油田的发现，石油生产的目标逐渐集中在低渗透油田开发上。由于低渗透油藏的生产能力和注水能力很差，渗吸采油在油田开发中发挥着重要的作用。在介绍了一种新的渗吸设备的基础上，利用其研究了低渗透岩心反向渗吸规律。利用X—Ray变化度检测仪，研究了岩心长短对反向渗吸动态、最终渗吸采收率的影响，以及渗吸过程中不同阶段岩心中含水变化度的变化过程。并得出如下结论：反向渗吸是裂缝性低渗透砂岩油藏的主要采油机理；由于低渗透油藏的特点，毛管力作用有效性受到限制，渗吸缓慢，渗吸采收率较低；X-Ray扫描结果揭示了渗吸初期渗吸速度快，渗吸前沿到达边界后渗吸速度变缓。

Low Permeability Sandstone Reservoir Imbibition Law Research

With the discovery of more and more low permeable oil fields, the objective of petroleum production is concentrated on the development of low permeable oil fields gradually. Due to poor production and injection capacity of low permeable reservoir, imbibition recovery plays important role in the oilfield development. This paper introduces a new kind of imbibition equipment, and by use of it we studied the reverse imbibition law of low permeable core. Using X-Ray' s degree of change checkout apparatus, we studied the core length effect on reverse imbibition performance and ultimate imbibition recovery, as well as the change course of watercut variation for core of different stages during imbibition process. And reach to the following conclusion: adverse imbibition is the main recovery mechanism in fractured low permeable sandstone reservoir; Due to the characteristic of low permeable reservoir, the effectiveness of capillary force is restricted, imbibition is slow, and imbibition recovery is low; the X-Ray' s scanning result shows that imbibition speed is quick at the initial stage of imbibition, and the imbibition speed slows down after imbibition frontline arrives the boundary.