85120612
Sep 1, 2010
May 10, 2011
WEATHERFORD TECHNOLOGY HOLDINGS LLC
Active Trademark
Automatic Feedback Control System for an Oil and Gas Well, namely, a closed-loop system comprised of computer software, computer hardware, rotating control heads, drilling chokes, pressure sensors, temperature sensors, flow meters, and mud pumps, which measures flow rates of drilling fluid into and out of the well and other parameters and controls a choke in an outlet conduit in order to control flow rate of the well and borehole pressure to provide pressure balance control of the well
Electrical and Scientific Apparatus