SUBSEA WELLBORE DRILLING SYSTEM FOR REDUCING BOTTOM HOLE PRESSURE

摘要

The present invention provides drilling systems for drilling subsea wellbores. A suction pump coupled to the annulus is used to control the bottom hole pressure during drilling operations, making it possible to use heavier drilling muds and drill to greater depths than would be possible without the suction pump. Various pressure, temperature, flow rate and kick sensors included in the drilling system provide signals to a controller that controls the suction pump, the surface mud pump, a number of flow control devices, and the optional delivery system.