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由于流体在裂缝和基质之间的复杂流动,天然裂缝性油藏的水驱油管理面临困难。流线模型通过孔间传质评价各注入井对相应生产井的注入效果。天然裂缝模型运用流线驱替注水效率的概念来提高水驱管理。考虑重力和裂缝与基质之间的窜流,运用算子分裂技术的流线方法首次模拟了双孔双渗模型中的水驱油过程。该模型能够重新分配注入水以改善裂缝和基质的原油采收率。快速的流线计算方法使得该模型也可以应用于矿场试验。本文阐述了基于注水效率的注入速率控制对模拟双孔双渗油藏的方法和实施办法,验证了实例模拟的有效性。该方法可以评价一注一采单元的注水效果。根据计算的注水效率可以确定注入速率的分配,以便从裂缝和孔隙中驱出更多的原油。实例证明,这种方法对高度非均质的天然裂缝性油藏非常有效。
Due to the complex flow of fluids between the fractures and the matrix, the management of water fracturing in natural fractured reservoirs is difficult. The streamline model evaluates the injection effect of each injection well to the corresponding production well through inter-pore mass transfer. The natural fracture model uses the concept of streamlined displacement to improve waterflood management. Considering the gravity and the channeling between the fractures and the matrix, the water-flooding process in the dual-porosity and dual-permeability model is simulated for the first time by the streamline method of operator splitting technique. The model can redistribute injected water to improve fracture and matrix oil recovery. Fast flow calculation method makes the model can also be applied to the field test. This paper describes the injection rate control based on water injection efficiency on the simulation of double-porosity and double-permeability reservoir methods and implementation methods to verify the effectiveness of the example simulation. This method can evaluate the water injection effect of one injection unit. Based on the calculated water injection efficiency, the distribution of injection rates can be determined in order to drive more crude oil out of the cracks and pores. Examples show that this method is very effective for highly inhomogeneous natural fractured reservoirs.