NEW METHOD OF FORMATION PRESSURE REAL TIME MONITORING USING DRILLING PARAMETERS

Lots of methods are available for calculating the formation pressure, while the results vary greatly in different area, different geological condition and different deposition environment, and sometime the accuracy is not satisfactory enough. The new method omitted the concept of normal shale trend line, and took such occasions as the abnormal formation pressure by under-compression, abnormal formation pressure by fluid inflation and abnormal formation pressure by other factors into consideration. The method of heredity is used for abnormal formation pressure calculation, and downhole pressure changing is separated real time from ROP data, thus realizing the real time calculating of formation pore pressure. Field application of this method improves the accuracy of formation pore pressure calculation.