基岩-孤立溶洞不稳定窜流方程

Channeling model of non-steady flow from matrix to insular cavity

塔河油田缝洞型碳酸盐岩储层中溶洞呈高度离散分布,是主要的储集空间。基岩是储层中广泛分布的等效连续介质,渗透率低,基岩向溶洞的窜流为非稳态窜流。提出单井钻遇孤立溶洞模型,模型外边界定压,溶洞视为扩大井筒,分析基岩与孤立溶洞间的不稳定窜流规律,初步建立基岩-孤立溶洞不稳定窜流模型。

Cavities constitute the main storage space in Tahe fracture-cavity carbonate reservoir and show highly discrete distribution. Matrix is widely distributed,equivalent continuum medium in reservoir and has low permeability.The channeling from matrix to cavity belongs to non-steady seepage.A model of insular cavity encountered by single well is described with constant pressure at exterior boundary.The cavity is regarded as extended wellbore.The law of non-steady flow between matrix and insular cavity has been analyzed with the model.