APPARATUS, SYSTEM, AND METHOD FOR CONTROLLING THE FLOW OF DRILLING FLUID IN A WELLBORE

摘要

A drilling system (10) includes a drill string (15) extending through a BOP (40) and a drilling fluid (52) discharge coupling (72) mounted to the BOP. In addition, the drilling system includes a drilling fluid control system (100) configured to control a pressure or flow rate of a drilling fluid (52) flowing through the discharge coupling. The drilling fluid control system includes a flow rate and pressure regulating device (110), a feedback controller system (200) configured to operate the regulating device, and a first sensor (102) configured to measure an actual pressure or flow rate of the drilling fluid flowing through the discharge coupling.