A very challenging HPHT well has been drilled utilizing an advanced ECD Management System including real time simulations, early diagnosis of upcoming problems, and real time simulations using state-of-the art models. The System uses all available real time drilling data (surface and downhole) in combination with real time modeling to monitor and optimize the drilling process. This information is used to visualize the wellbore in 3D in real time. It has been implemented in Total E&P Norge TASC (Total Activities Support and Collaboration) Center in Norway. The system is composed of the following elements, some of which are unique and ground-breaking:• An advanced and fast Integrated Drilling Simulator which is capable of modeling the different drilling sub-processes dynamically, with interaction between these sub-processes in real time.• Automatic quality check and corrections of drilling data; making it suitable for processing by computer models • Real time supervision methodology for the drilling process using time based drilling data as well as drilling models / the integrated drilling simulator.• Methodology for diagnosis of the drilling state and conditions. This is obtained from comparing model predictions with measured data.• Advisory technology for more optimal drilling. • A Virtual Wellbore, with advanced 2D and 3D visualization of the downhole process.• Data flow and computer infrastructure.Among the challenges during planning and drilling of this well have been:• Very small window between pore and fracture pressure. RT ECD simulations were performed with an advanced hydraulic and thermal wellbore model. • Increased probability for instabilities in the tight window. Was mitigated by RT stability modeling during drilling.• Pore pressure predictions which were updated during drilling.Experiences from the drilling as well as use of the ECD Management System will be summarized and presented. The usefulness of supervision and diagnosis functionalities is illustrated.

A very challenging HPHT well has been drilled utilizing an advanced ECD & Temperature, Well Stability and Geo Pressure Management System including real time simulations, early diagnosis of upcoming problems and real time simulations using stateof-the art models. The System uses all available real time drilling data (surface and downhole) in combination with real time modelling to monitor and optimize the drilling process. This information is used to visualize the wellbore as well as simulation results in 3D in real time. It has been implemented in Total E&P Norge TASC (Total Activities Support and Collaboration) Center in Norway. Among the System elements are:• An advanced and fast Integrated Drilling Simulator which is capable to model the different drilling sub-processes dynamically, and also the interaction between these sub-processes in real time. The Integrated Drilling Simulator is used for automatic forward-looking during drilling, and can be used for what-if evaluations as well.• Data flow and computer infrastructure Among the challenges during planning and drilling of this well have been • Very small window between pore and fracture pressure. RT ECD simulations was performed with an advanced hydraulic and thermal wellbore model • Increased probability for instabilities in the tight window. Was mitigated by RT stability modeling during drilling • Uncertainties in pore pressure predictions. Was mitigated by updating predictions during drilling.Experiences from the drilling as well as use of the decision support System will be summarized and presented.

A very challenging HPHT well has been drilled utilizing a Managed Pressure Drilling System comprised of an advanced ECD Management System with automatic decision support, and real time simulations using state-of-the art models. The System uses all available real time drilling data (surface and downhole) in combination with real time modelling to monitor and optimize the drilling process. Especially the dynamic well pressure and the allowable drilling window (pore / fracture pressures and well stability limits) are focused on. The information is used to visualize the wellbore in 3D in real time. It has been implemented in Total E&P Norge TASC (Total Activities Support and Collaboration) Center in Norway.The system is composed of the following elements:An advanced and fast integrated wellbore flow and thermal simulator modeling the thermohydraulics effects dynamically, and also the interaction between flow and temperature effects in real time. Automatic quality check and corrections of drilling data; making them suitable for processing by computer models Real time supervision of the drilling window using time based drilling data as well as drilling models Diagnostics of the drilling state and conditions. This is obtained from comparing model predictions with measured data. Automatic forward looking of the ECD A Virtual Wellbore, with advanced visualization of the downhole process. Data flow and computer infrastructure Among the challenges during planning and drilling of this well have been:Very small window between pore and fracture pressure. RT ECD simulations were performed with an advanced hydraulic and thermal wellbore model, and automatic supervision of the margins versus pore and fracture limits was performed. Increased probability for instabilities in the tight window. Was mitigated by RT stability modeling during drilling. Uncertainties in pore pressure predictions. Was mitigated by updating predictions during drilling.Experiences from the drilling as well as use of the MPD System will be summarized and presented. The supervision and diagnosis functionalities have been useful in particular.

A very challenging HPHT well has been drilled while running an advanced decision support and ECD Management System including early diagnosis of upcoming problems and real time simulations using state-of-the art mathematical models. The System has been running in parallel with the operation, and used all available real time drilling data (surface and downhole) in combination with real time modelling to monitor and optimize the drilling process. This information was also used to visualize the wellbore in 3D in real time. Automatic forward-looking of ECD was also part of the active system. It was implemented in Total E&P Norge TASC (Total Activities Support and Collaboration) Center in Norway. The System was piloted by Total, and was therefore not integrated in Total's work and decision process. Among the challenges during planning and drilling of this well have been Very small window between pore and fracture pressure. RT ECD simulations were performed with an advanced hydraulic and thermal wellbore modelIncreased probability for instabilities in the tight window. This was mitigated in the System by RT stability modeling during drillingUncertainties in pore pressure predictions. This was mitigated in the System by updating predictions during drilling. Experiences from use of the System clearly show: -The forward-looking capability gave early warning of a near-future kick situation. And the diagnosis functionality gave first an early warning of an upcoming kick and then a firm diagnosis.-A loss situation was warned against and eventually diagnosed by the System.-Potentially at least 10 rig days, large amounts of drilling mud and a squeeze cement job could have been avoided by fully utilizing the System.-The drilling risks could have been reduced and safety increased through reducing the impact of the kick/loss situations and possibly even avoiding them.

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