不同物性储层微观渗流特征差异研究

针对目前特低渗透储层开发难的特点，应用真实砂岩微观模型，对高、低渗不同物性储层微观渗流特征差异进行分析研究。研究表明：不同物性储层微观渗流特征差异显著，高低渗模型的驱油效率平均相差19％；储层物性及水驱油体系的能量耗散和能量释放、驱替压力、孔隙结构非均质性是影响高、低渗模型微观渗流特征和驱油差异的主要因素；在低渗模型中采用降阻剂驱替后，驱油效率提高11％。经过分析，建议低渗储层通过储层改造，或通过非常规水驱来改善油层水驱效果。

A Study on Differential Micro Seepage Flows between Reservoirs with Different Petrophysical Properties

Because of difficult development of reservoirs with very low permeability, the differential micro seepage flows are studied between reservoirs with high and low penetrability by using a micro model of true sandstone.The results show that there are remarkable differences in micro seepage flows between reservoirs with high and low penetrability,with their average difference in oil displacement efficiency up to 19%.The main factors to cause different micro seepage flows and oil displacements are reservoir petrophysics and energy dissipation and release,displacement pressure and pore structure heterogeneity in a water displacing oil system.The oil displacement efficiency can increase 11% when an antifrietion-agent displacement is applied in the low-permeability model.By an analysis,it is proposed that the water displacement effects should be improved by reservoir modification or non-conventional water displacement in reservoirs with low permeability.