数值模拟地层测试测井流体性质解释模型

Fluid Property Interpretation Model for Formation Testing Based on Numerical Simulation

电缆地层测试技术可有效获取地层压力、识别油气层和储层流体性质、确定储层物性参数,在油气田勘探开发中得到了越来越多的应用。研究基于渗流力学理论,采用油藏数值模拟方法,建立模块式地层动态测试器(MDT)数值模拟仿真模型,分析储层的流度、侵入深度等敏感参数对MDT泵取流体的影响,明确见油体积(开始见油的泵出体积)与侵入深度的相关性,并确定相关表征模型。研究结果表明,见油体积与侵入深度成线性关系;当储层的流度较高时,见油体积为基本为恒定值;当储层的流度较低时,见油体积与流度成指数关系,并且实际测量资料与正演结论一致。根据泵出4倍见油体积和含水率的关系可以判定储层的流体性质,节省了实际操作时间,对MDT现场操作和技术研究有指导性意义,为储层评价提供了新的思路。

Cable formation testing technology can effectively obtain formation pressure,identify oil and gas reservoirs and reservoir fluid properties,determine reservoir physical parameters,and has been more and more applied in oil and gas exploration and development.Based on the theory of percolation mechanics and the method of reservoir numerical simulation,the simulation model of MDT testing is established.The influence of sensitive parameters such as reservoir fluidity and invasion depth on MDT pumping fluid is analyzed.The correlation between oil volume(pump volume at the beginning of oil seeing)and invasion depth is clarified,and the relevant characterization model is determined.The results show that the volume of oil visible(the pump volume at the beginning of oil visible)has a linear relationship with the depth of invasion;when the reservoir fluidity is high,the volume of oil visible is basically constant;when the reservoir fluidity is low,the volume of oil visible has an exponential relationship with the fluidity,and the measured data are consistent with the forward conclusion.According to the relationship between pump volume and water cut,the fluid properties of reservoir can be determined,and the actual operation time can be shortened.It has guiding significance for MDT field operation and technical research,and provides a new idea for reservoir evaluation.