Patent ID: 9279299
Filing Date: 2016-03-08
CPC Classification: E21B

Claim Text:
1. A drilling system for managed pressure drilling comprising: at least one sensor to continually sense at least one real-time fluid property of an input fluid to a well and a return fluid from the well; a controllably adjustable flow control apparatus disposed in a return flow line to regulate a flow of the return fluid; and a controller operably connected to the controllably adjustable flow control apparatus to instruct the controllably adjustable flow apparatus to regulate the flow of the return fluid to maintain a wellhead setpoint pressure based at least in part on the real-time sensed fluid property of the input fluid and the return fluid, wherein the at least one continually sensed fluid property comprises at least one of: fluid density, oil/water ratio, chlorides content, electric stability, shear stress, gel strength, plastic viscosity, yield point, and combinations thereof.