断块油藏二氧化碳驱油相对渗透压力模拟研究

Simulation Study on Relative Osmotic Pressure of Carbon Dioxide Flooding in Fault Block Reservoir

为分析二氧化碳驱油对断块油藏采收时相对渗透压力的影响,进行断块油藏二氧化碳驱油相对渗透压力模拟研究。利用断块油藏储层三维地质模型模拟油藏储藏区地貌,并采用状态方程相态分析软件构建断块油藏物性模型,实现实验数据的拟合,利用拟合数据模拟实际油藏,进行二氧化碳驱油研究。结果表明,250 m井距下的采出效果相对较好;当渗透压力为30 MPa时,驱油效率较高,产出气油比高于其他几种渗透压力;二氧化碳驱油后含水率明显低于水驱;渗透率越大,二氧化碳驱油效率越高。

In order to analyze the influence of carbon dioxide flooding on the relative osmotic pressure during recovery of fault block reservoir,a simulation study on the relative osmotic pressure of carbon dioxide flooding in fault block reservoir was proposed.In which,having a 3D geological model of the fault block reservoir used to simulate the landform of reservoir area,and the physical property model of fault block reservoir constructed by making use of state equation phase state analysis software to realize the fitting of experimental data,as well as having the fitting data used to simulate actual reservoir and carry out carbon dioxide displacement experiment.The results show that,the production effect of 250 m well spacing becomes better relatively;when the osmotic pressure stays at 30 MPa,the oil displacement efficiency becomes higher,and the produced gas oil ratio outperforms that at other osmotic pressures;the water cut after CO2 flooding is significantly lower than that of water flooding and the greater permeability can bring about higher carbon dioxide displacement efficiency.