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 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. 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.

  • The transient flow & thermal wellbore model is coupled to the well stability model in real time, so that the updated well pressures and temperatures and drilling mud properties are used by the well stability model for RT predictions.

  • A multi-purpose geo-pressure modelling tool which includes all significant processes relevant to pressure generation and dissipation is coupled to the integrated drilling simulator and can give updated pore pressure predictions during drilling.

  • 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 visualization of the downhole process. A new generation visualization system designed to integrate all participants involved, will enable enhanced collaboration of all drilling and well activities in a global environment.

  • 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.

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