Most reservoir simulators treat horizontal wells as if they were vertical wells tipped sideways and assume that fluid flows along straight radial lines. The pressure isobars near the well will consequently look like perfect cylindrical surfaces. This, of course, does not fully take into account the true three dimensional complexity.
Not surprisingly, ExcSim does it the right way. Streamlines around a horizontal well come in from all directions. Consequently, pressure fields and well performances are very different from what the conventional approach predicts.
Figure 2 illustrates actual 3D isobars around horizontal wells.
ExcSim takes great care when it comes to computing near well pressure fields. This ensures that well performance predictions are as accurate as possible. Figure 3 illustrates a typical case.
DEFINING HORIZONTAL WELLS IN EXCSIM
Any well in ExcSim whose well name starts with the two letters HX will automatically be understood to be a horizontal well oriented in the X-direction. If the well-name starts with HY, it will be assumed to be horizontal in the Y-direction.
That's all there is to it! Easy-peasy-lemon-squeezy!
ExcSim takes care of all the rest. Horizontal wells in ExcSim extend across the entire length (or width) of well-blocks.