Predicting Abnormally High Reservoir Pressures During Exploratory Drilling.

Based on prediction of abnormally high pore pressure zones by a rapid method, in the course of oil well drilling, zones of transition from the normal pore pressure to abnormally high pore pressures are detected. Curves of the regularities of distribution of the gradient of pore and static pressures of the drilling mud column in the Bulla-offshore oil field are plotted. This method permits control of drilling mud counter pressure.