THE APPLICATION OF WELLBORE STABILIZATION THEORY IN THE EAST SICHUAN

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.