多层砂岩油藏可视化模型水驱油物模实验研究

为了获得更为直观的多层砂岩油藏水驱油渗流特征和机理，结合实际油藏地质特征，设计制备了一种大尺度可视化砂箱物理模型，进行了不同注水方式、不同注水速度的水驱油实验，考察了不同注采方式、不同注入速度对水驱油效率的影响，以及水驱油过程中的油水运动分布特征。该模型具有设计尺寸大、模拟程度高及直观可视等特点，较其他模型更具代表性。通过模拟NP 油田某区块砂岩地层，根据几何相似、井型相同、层序韵律相同、流体黏度相同的原则，更加真实的模拟地层条件。实验结果表明，不同的注水方式及注水速度对模型的采收率有较大影响。采油井数多，单井控制面积小，采收率略高；而注水速度低，油井见水晚，含水率上升缓，可以有效提高采收率，这一过程也反映了重力分异的影响。水驱特征曲线拟合表明，该实验过程符合水驱特征，能够较准确地预测可采储量及采收率。

Experimental Research of Physical Simulation on Visual Model Water Flooding Flow Character of Multi-Layer Sandstone Reservoir

Based on the actual reservoir geology character，a large-scale visual sandbox physical model was designed to studythe flow mechanism in multi-layer sandstone reservoir directly. The effects of different injection methods and velocities on theefficiency of water flooding and distribution of water and oil in the process of water flooding are studied. The model has a largersize and a high degree of simulation，and visualization. It is more representative than other models. The model was designedon the basis of sandstone strata in a block of NP Field，according to the principle of similar geometric，the same well-type，sequence rhythm，and fluid viscosity，so that the simulation of underground conditions is more real. The real results showthat different injection methods and velocities have great effect on the recovery of the model. When there are more wells，andsingle well controlled area is small，recovery will be highlightly；when the injection velocity is low，and water breakthroughislate，water cut increases slowly，thich can effectively enhance oil recovery，and also reflects to gravitational differentiation.The waterflood characteristic curve fitting shows that the new experiment meets water displacement feature，so it can predictrecoverable reserves and recovery accurately. This research presents a new physical simulation equipment，to help choose areasonable work system.