分形几何理论在屏蔽暂堵剂优选中的应用

针对现有暂堵剂优选理论精确化、定量化程度不足的情况 ,在继承传统屏蔽暂堵剂优选理论的基础上引入分形几何理论 ,提出用分维数来定量描述储层岩心孔隙尺寸分布和暂堵剂粒度分布特征。以岩心孔隙尺寸分布与暂堵剂粒度分布分维数相近作为优选暂堵剂的原则 ,从而在继承传统理论的基础上建立起了屏蔽暂堵分形理论。利用此理论对新疆莫北地区储层岩心进行了暂堵剂优选和室内暂堵试验 ,取得了较好的效果 ,初步验证了理论的正确性。

Application of Fractal Theometry Theory to Optimal Selection of Temporary Plugging Agents

At present, the optimal selection of temporary plugging agents(TPA) in application of the temporary plugging techniques(TPT) is based on experiment to some extent. In this thesis, the fractal theory is used to characterize the complexity of the distribution of the pore sizes of reservoir core and reflect the distribution granularity of TPA. For a certain formation, the fractal dimension(D) of optimal TPA is approximated to that of the formation. Thus, fractal dimension can be used to discribe the distributions of reservoir pore sizes and TPA granularity. The fractal theory for optimal selection of TPA is established and applied to optimal selection test of TPA and temporary plugging test in laboratory using reservoir pore from Mobei zone in Xinjiang region. The test result shows that the theory is valid.