SYSTEM FOR CONTROLLING THE OPERATING PRESSURES WITHIN A SUBTERRANEAN BOREHOLE

摘要

The system monitors the operating pressures within a tubular member (18) and compares the actual operating pressure with a desired operating pressure. Th e difference between the actual and desired operating pressure is then process ed to control the operation of an automatic choke (102) to thereby controllably bleed pressurized fluidic materials out of the annulus (24) between the tubuolar member (18) and the borehole (12) thereby creating back pressure within the borehole.