河流相平面非均质储层水平井泄气范围确定方法

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.

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

Accurate calculation of gas well drainage area can provide effective support for rational gas well deployment, but the study of gas well drainage range in heterogeneous reservoirs is a difficult point. In fluvial reservoir, the reservoir lithology change is fast, the distribution of sand and mud is alternate, reservoir heterogeneity is strong, the size and shape of the channel bar, the width and direction of river channel have great influence on the gas release range of gas well. The seepage boundary of gas well is generally irregular distribution, and there is also heterogeneity in the channel bar or river channel. The drilling encounter rate of sand body in horizontal section is less than 100%, while the gas drilling encounter rate is lower. These factors further increase the difficulty of determining the actual gas drainage radius of gas wells. In this paper, the effective percolation volume proportion within the well control range is obtained by using the gas drilling encounter rate and physical parameters along the horizontal section. Then, the dynamic production data and material balance method are used to evaluate the dynamic reserves of gas wells, and the effective seepage volume of gas wells is calculated. Finally, combined with the reservoir distribution characteristics, the gas drainage range of gas wells in heterogeneous reservoir is determined. The research results show that: considering the reservoir heterogeneity, the gas drainage range is highly consistent with the distribution of effective reservoirs, and providing effective technical support for reasonable well layout of gas reservoirs.