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首页> 外文会议>SPE Asia Pacific improved oil recovery conference (APIORC 01) >Viscous-Elastic Fluids Can Mobilize Oil Remaining after Water-Flood by Force Parallel to the Oil-Water Interface
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Viscous-Elastic Fluids Can Mobilize Oil Remaining after Water-Flood by Force Parallel to the Oil-Water Interface

机译：粘弹性流体可通过平行于油水界面的力将注水后的剩余油动员

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摘要

Residual oil after water flooding appears in three types: oilrndrops, films and clusters. Work performed using Newtonianrnfluids shows that to mobilize the residual oil remaining afterrnwater flooding, the driving forces, on condition of oil-waterrnIFT (interfacial tension) being constant, need to be increasedrnby one thousand to ten thousand times over that of waterfloodingrnbefore the capillary forces retaining the residual oilrncan be overcome [1]. Viscous forces cannot be increased byrnsuch a large magnitude in the field.rnPolyacrylamide (PAM) solutions have little effect on the oilwaterrnIFT. However, results in the laboratory and field showrnthat after flooding by polymer fluids, all types of microscopicrnscale residual oil in porous media are lowered [2]. The amountrnthat is lowered is related to the elasticity of the fluids. Otherrnconditions being the same, the higher the elasticity, the lowerrnthe residual oil saturation.rnThe results of lab tests (including microscopic visualizationrncores) show that viscoelastic fluid flooding can lower thernresidual oil saturation in cores of different wettabilities. Thernmain forces to mobilize the residual oil by viscoelastic fluidsrnare not entirely the same as that of Newtonian fluids. It is notrnonly a force perpendicular to the oil-water interfacernovercoming the restraining capillary force, but also a viscousrndragging force parallel to the oil-water interface that mobilizesrnthe residual oil.
机译：注水后的残余油有三种类型：油滴，薄膜和团簇。使用牛顿流体进行的工作表明，要调动水驱后残留的剩余油，在油水IFT（界面张力）恒定的情况下，驱动力需要比注水的驱动力增加一千至一万倍，然后才能保持毛细作用力。残留油可以克服[1]。在野外如此大的幅度不能增加粘性力。聚丙烯酰胺（PAM）溶液对油水的IFT影响很小。然而，在实验室和现场的结果表明，在用聚合物流体驱油后，多孔介质中所有类型的微观残留油都降低了[2]。降低的量与流体的弹性有关。其他条件相同时，弹性越高，剩余油饱和度越低。实验室测试（包括微观可视化岩心）的结果表明，粘弹性流体驱替可以降低不同润湿性岩心的剩余油饱和度。通过粘弹性流体动员残余油的主要力量与牛顿流体并不完全相同。不仅垂直于油水界面的力克服了约束毛细力，而且还平行于油水界面的粘滞力移动了残余油。

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