Automatic Calibration of Real-Time Computer Models in Intelligent Drilling Control Systems - Results From a North Sea Field Trial

Many real-time decision support systems for drilling operations, or advanced drilling control systems, are based on computer<br>models calculating wellbore pressure and mechanical forces on the drillstring. Closed loop control systems, for example for<br>Managed Pressure Drilling, or advanced offshore or onshore decision support systems are examples of systems that may<br>involve such real-time calculations. To obtain a high degree of accuracy in these calculations it is crucial that all parameters<br>describing the system are as correct as possible. Uncertain model parameters may be tuned against measurements. Both<br>surface measurements, like standpipe pressure, hook load and torque, and downhole pressure from Measurement While<br>Drilling tool may be used.