Abstract
Managed Pressure Drilling (MPD) is performed in offshore and onshore oil and gas areas to reduce the risks that may be associated with using conventional drilling hydraulic methods. The aim of MPD is to reliably and precisely control the pressure at the bottom of well within what is known as the pressure window'. Manual control of the choke valve was adapted from manual well control methods developed for circulating out an oil or gas influx. There have also been attempts dating back more than 40 years to automate the choke controller for influx circulation, though as of today there is still not a reliable automated system available for this purpose. Over the last ten years, MPD systems with various levels of automation have been developed. The current automated MPD system has been successfully used worldwide to drill hundreds of wells with narrow pressure windows. This paper discusses the development history and the newest developments in automated choke control with a forward-looking view of automated processes to precisely manage well pressure.
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