【摘要】 从井眼的力学稳定性着手，建立了井眼稳定性分析的力学模型。用川东地区的钻井资料、测井资料以及岩心试验结果，计算分析了大天池构造自流井群地层的平衡压力当量密度，同时还分析了地层倾角和浸泡时间对井壁稳定性的影响、提出了适用于该地区的平衡压力当量密度设计方法。该方法简单，便于现场应用，计算结果与实钻资料吻合，为该地区钻井液密度的正确选取提供了理论依据和设计方法。更多还原

【Abstract】 The paper demonstrates the mechanical model of wellbore stability,analyzes and estimates the equalized pressure equivalent density of the formation in Datianchi structure,in which there is a group of flowing wells,based on drilling and logging data of the area. The paper presents a design method of the equalized pressure equivalent density, through analyzing the influence of dip and soak time on wellbore stability. It will provide a theoretical basis and design method for drilllng fluid density, due to its reliab1e and simple for field use.更多还原