欠平衡钻井随钻储层评价技术研究与应用

Study and Application of Reservoir Evaluation Technology while Under-balanced Drilling

在欠平衡钻井打开储层时,油气通过多孔介质渗流进入井筒,地面监测产量反映储层信息,通过建立两者之间的关系来实现随钻储层评价。分析了随钻过程储层渗流边界特点,建立和求解渗流数学模型,并耦合井筒多相流模型进行随钻解释。通过对现场监测数据分析处理,得到的储层评价结果与对应测井结果一致,实践证明该技术具有广阔的应用前景。

When reservoir has been opened by under-balanced drilling, oil and gas percolate porous medium into the wellbore.The production rate during drilling reflects the reservoir information,so establishing the relation between them to achieve reservoir evaluation while under-balanced drilling.After analyzing flow characteristics of reservoir boundaries drilling process, the article has established and solved the mathematical model of seepage. Based on the mathematical model coupling wellbore multiphase flow model,the results of monitoring data analysis conform to the well logging.Practice has proved this technology has wide application prospects.