These included honouring horizons with a reasonable number of cells, connecting to other grid modules and handling anisotropy etc. Many technical barriers prevented us from following a straight road to get to the 3D solution. But the path was nearly as convoluted as some of the well trajectories we were being asked to model. However, if one wants to model the shut-in for such a well, with logarithmic time sampling, it is necessary to create a series of grids that will handle the very early time radial or elliptical flow towards the wellbore, the vertical diffusion when the well is of limited entry, the transition towards horizontal flow and finally the horizontal flow itself.With our experience to date of using the Voronoi grid it was natural to follow this road in the development of this particular well model. It also means the characteristics around the well, particularly in the vertical direction, bring little value. Naturally, analytical well index calculations are easy to implement, but this works for coarse grids only and with commensurate large time steps. The automatic gridding of a well with any trajectory has been the most challenging numerical development for KAPPA to date.Developing a numerical model for a simple slanted well was already a challenge.
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