A novel method of predicting pore pressure has been invented. The method
utilizes currently recorded drilling measurements to predict the pore pressure of the
formation through which the bit is drilling. The method applies Mohr’s Theory to
describe the stresses at the bottom of the borehole. From the stress state and knowledge
of Mohr’s Envelope, the pore pressure is predicted. To verify the method, a test
procedure was developed. The test procedure enabled systematic collection and
processing of the drilling data to calculate the pore pressure prediction. The test
procedure was then applied to industry data that was recorded at the surface. The
industry data were composed of wells from different geographical regions.
Two conclusions were deduced from the research. First, Mohr’s Theory indicates
that the model is valid. Second, because of too much variation in the torque
measurements the model cannot be proved and requires further investigation
