随钻地层压力监测和预测技术研究

RESEARCH ON MONITORING AND FORECASTING TECHNIQUES OF FORMATION PRESSURE WITH DRILLING

随着油气勘探开发的日益深入,目前钻探地层普遍存在着多产层、多压力系统,且高低压相间,钻井过程中井下复杂事故时有发生,严重影响钻井周期和钻井成本。因此,深入开展随钻地层压力监测与预测研究工作是十分重要的。为此,推荐使用两种随钻压力监测方法(dc指数法、sigma计算法),并详细阐述了两种监测方法的基本原理和计算模型,分析了两种监测方法的优势和差异。实际应用表明,该监测和预测技术能够为钻井工作提供可靠依据。

At present, with the development of oil and gas exploration, multi-pay formation and multiple pressure system existed in drilled formation, the In the process of drilling, downhole complex accidents occur frequently and seriously affect the drilling cost and drilling cycles. So, it is very important to research the monitoring and forecasting techniques of formation pressure with drilling. Two drilling pressure monitoring methods (dc index method, sigma method) were recommended, the basic principles and computational model of two monitoring methods were presented in detail and the advantages and differences of the two monitoring methods were also analyzed. The application results showed that the monitoring and forecasting technology could provide a reliable basis for the drilling operation.