Boundary Control and Estimation for Under-Balanced Drilling with
Uncertain Reservoir Parameters
Boundary Control and Estimation for Under-Balanced Drilling with
Uncertain Reservoir Parameters
In under-balanced drilling, the bottom-hole pressure is kept below pore pressure, causing pressure dependent influx of reservoir gas into the wellbore that makes the system unstable at low drawdowns. In this paper we propose a feedback controller which stabilizes the system around an arbitrary pressure setpoint, using only topside measurement, …