METHOD OF DYNAMICALLY CONTROLLING BOTTOM HOLE CIRCULATION PRESSURE IN A WELLBORE

摘要

A method of drilling has the first tubular member, which has an inner annulus (8) therethrough. A fluid is pumped into the well through the inner annulus (8) of the first tubular member to flush drilling cuttings out of the well through a second annulus (10). A fluid is also injected into the well from an outer annulus (11), exterior to the inner annulus, to control the bottom hole circulating pressure in the well.