河流相平面非均质储层水平井泄气范围确定方法

Method for Determining Horizontal Well Drainage Range in Plane Heterogeneous Fluvial Reservoir

为了准确计算河流相平面非均质储层水平井泄气范围大小。通过分析完钻井、录井和测井资料获取气井水平段含气钻遇率及沿水平段不同单元物性参数大小,定量表征井控范围内储层的非均质性。再利用气井产量压力生产数据,采用流动物质平衡方法评价气井动态储量。在此基础上计算井控范围内的气井有效渗流面积,同时结合储层分布特征调整井控泄气范围边界,最终研究形成河流相平面非均质储层气井泄气范围确定方法。研究结果表明:在非均质储层条件下,计算气井泄气半径需综合考虑储层的含气性、物性参数变化和储层分布等因素,通过理论计算和实际井分析对比,可见考虑储层非均质计算的气井泄气半径更符合气井生产实际,泄气范围与有效储层分布契合度高。

In order to accurately calculate the gas drainage range of horizontal wells in fluvial facies plane heterogeneous reservoir,the heterogeneity of the reservoir can be characterized quantitatively by analyzing the drilling,logging data and the physical property parameters of different units along the horizontal section of the gas well.The dynamic reserves of gas well is evaluated with the method of flowing material balance.On this basis,the effective drainage area of the gas well is calculated,and the boundary of the gas well drainage area is adjusted according to the reservoir distribution characteristics.Finally,the method of calculating the gas drainage range of the gas well is created in the plane heterogeneous reservoir of fluvial facies.The research results show that:under the condition of heterogeneous reservoir,the calculation of gas well drainage radius needs to comprehensively consider physical property parameter change and the reservoir distribution.Through the comparison of the results of theoretical calculation and actual well analysis,the gas drainage range is highly consistent with the distribution of effective reservoirs,the results can provide effective technical support for reasonable well layout of gas reservoirs.