DRILLING SHAFT PRESSURE CORRECTION METHOD

摘要

Disclosed is a drilling shaft pressure correction method. The method comprises: measuring bottom hole pressure using a downhole pressure measurement-while-drilling tool; calculating a predicted bottom hole pressure; and correcting drilling shaft pressure using the measured bottom hole pressure and the predicted bottom hole pressure, so as to achieve controlled pressure drilling. The method makes up for the defect in the prior art that the error between a drilling shaft pressure calculation processing method and the actual downhole pressure is relatively great, and by means of the method, drilling shaft pressure can be more quickly and accurately calculated in real time, so that accurate calculation and real-time correction and control of dynamic shaft pressure on a narrow density window stratum are achieved, thereby meeting the requirement of good bottom hole pressure control and the requirement of ensuring safe and quick drilling.