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.

The paper presents a highly advanced training simulator that combines an advanced top-side simulator with a dynamic downhole simulator with an advanced transient integrated hydraulics and thermal wellbore model and a dynamic torque and drag model. The simulator is aimed at drilling and well operations, and is able to handle most of the normal operations, including high pressure high temperature (HPHT) wells, through-tubing rotary drilling (TTRD), extended reach drilling (ERD) and managed pressure drilling (MPD). The underlying simulator technology is modular, allowing for new modules to be added at a later stage. For instance, MPD control systems can easily be added to the simulator, allowing for training on an MPD operation with both the drilling crew and the MPD supplier. The simulator is able to use pre-programmed scenarios, replay, fast forward and rewind to facilitate efficient training and review sessions Moreover, the simulator is designed to provide realistic personnel training on emergency procedures and operations such as well control in a safe environment, thereby limiting the human factor in critical operations as well as possibly improving the procedures by frequent use and revision. Also, the simulator allows for integration of HSE in early well planning through simulator training on the actual well to be drilled. The main innovation is to use dynamic models verified in real-time operations together with an advanced top-side drilling equipment simulator for training on well specific scenarios. The value added for the industry is to give the drilling and/or engineering teams a possibility to verify and train on identified risk elements prior to drilling a well, as well as retrain during the operation on a "true" virtual copy of the well. So far more than 60 drilling teams have experience from training, and the feedback has been very positive. The paper will present the simulator as well as experiences from typical training cases on challenging wells.

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.

A very realistic training simulator for dual gradient drilling has been developed, and then utilized for training. Realism in the responses that trainees see is ensured by embedding advanced real time downhole mathematical models, which are set up with the planned configuration for each upcoming well.Dual Gradient Drilling (DGD) capabilities have been developed into an already proven dynamic hydraulic and temperature model. The flexibility of the model allows incorporating additional pumps in the flow, as in Dual Gradient Systems. The model includes dynamic 2-D temperature calculations, covering the radial area affecting the well. To create the Dual Gradient functionality a subsea pump module was developed, including the mud return line. To assure that the simulator behaves realistically extensive work was done, including implementation and verification of the U-tubing effects in the system. The model has been implemented into a virtual reality training simulator which also includes a full 3D topside drilling environment and 3D downhole visualization model. This unique DGD training simulator has been utilized for training the drilling teams (both drilling team and DGD operational team). First training for operations utilizing the Controlled Mud Level (CML) system in Norway was developed around the training simulator. Then a further development was done prior to DGD operations in GoM, integrating a quick closing annular as well as booster line functionality. The training course was created around the Dual Gradient procedures, including the contingencies procedures with a focus on the communication between the different parties in the DGD operation.The paper presents the model basis and how this is implemented into an advanced virtual reality training simulator which enable accurate modelling of the upcoming well. Furthermore, the training process of the drilling crews will be presented including lessons learned.