【摘要】 应用真实砂岩微观模型水驱油实 验对安塞长６ 特低渗 透油层见水后 的水驱油机理 及特征观察分 析认为：贾敏效 应对见水后的水驱 油效率影响突出，表现形式为注水 阻力增大、注入压力升高。随注入压力的增加，注入水形成 新的渗流通道后使原已形成的水流通道 “锁死”；残留于孔隙喉道处的油滴 受毛细管附加阻 力影响只发生 变形而难以运 移。在储层孔 隙结构非均质 影响下，长６ 油层中流体的渗 流仅作用在部分连通较好的大孔 隙内，当注入 ０．５～０．８ 倍于孔隙体积的注入水后 ，油井均已见水。残留于水洗通道中的油滴在 水动力作用下不断发生卡断－ 聚并 － 再卡断的过程为见水后驱油效率 增加的方式之一。在裂缝发育带水 驱油的形式主要取决于孔 隙渗透率、裂缝渗透率以及驱替压 力的大小。更多还原

【Abstract】 On the basis of water drive experiments with the micromodel of true sandstone,the water drive mechanism and characteristics of the Ansai Chang 6 supertight reservoir after water occurrence is observed and analyzed.It is considered that the Jiamin Effect exert a notable influence on the water drive efficiency after water occurrence,and is characterized by the increase of injection resistance and pressure.With the rising of injection pressure,the water flow pathway formed before is "deadlocked" after injected water forms new seepage pathways,the oil drops left in pore throats only deform and are difficult to migrate under the impact of additional capillary resistance.Affected by the anisotropy of reservoir pore structure,the seepages of fluid in the Chang 6 reservoir only have effects on part well interconnected macro pores.When injected water is 0.5-0.8 times of pore volume,water occurs in all oil wells.the continuous jaming colesing rejaming process of the oil drops left in water flushing pathways under hydrodynamic action is one of the ways to raise the oil expulsive efficiency after water occurrence.The water drive patterns in fissure developing zones mainly depend on whether pore permeability,fissure permeability and displacement pressure are high or low.更多还原