低渗透油藏渗吸机理及发展研究

Research on Low Permeability Reservoir Imbibition Mechanism and Development

低渗透油藏孔隙度和渗透率低,孔隙半径小,毛细管力大,常规注水开发效果差。研究表明渗吸作用受岩石性质和流体性质等因素的影响。通过研究渗吸机理及影响因素、掌握不同因素对渗吸采收率的影响,对低渗透油藏的开发具有指导作用。渗吸也是导致压裂液滤失的重要原因,充分研究基质的渗吸能力及渗吸速率对确定压裂液体积、优化回流设计具有重要意义。

Both the porosity and the permeability of low permeability reservoir are low, and the capillary force is large and the effect of development is poor when conventional flood development is adopted. According to the results of research, imbibition is affected by the factors like rock properties and fluid properties, etc. It serves as a guide for the development of low permeability reservoir to study the imbibition mechanism and its affecting factors and to understand the effects of different factors on recovery efficiency. Imbibition is one major factor causing the fracturing fluid leak-off as well. It has important meaning to study the imbibition capacity of matrix and the imbibition rate for the determination of fracturing fluid volume and the optimization of reflux design.