Well drilling system

Abstract

A well drilling system includes a torque drive system; a tubular string positioned below and rotated by the torque drive system; a pipe handler and back-up clamp assembly positioned between the torque drive system and the tubular string for coupling with and supporting one end of the tubular string; at least one internal blow-out preventer (IBOP) valve positioned between the torque drive system and the back-up clamp assembly; and a measurement device for measuring parameters of drilling, casing running or tubular make-up and break-out operations. The measurement device measures parameters below the IBOP valve so that parameters such as internal fluid pressures may be monitored even when the IBOP valve is closed. The measurement device is separate from the IBOP valve and is connected above the back-up clamp assembly and tubular string.

Dependencies are inferred from the claim text.