ABSTRACT
This paper reports the results of comparisons of simulation runs performed by fourteen organizations on a problem involving production from a horizontal well in a reservoir where coning tendencies are important. The effect of well length and rates on the recovery is examined. In addition, the paper also reports the techniques used by the different participants to calculate the inflow into the horizontal well and the wellbore hydraulics.
A variety of methods was used by the participants to model the inflow into the horizontal wells ranging from the use of productivity indices to grid refinement. A multitude of techniques was also used to calculate wellbore hydraulics while a few participants selected to represent the wellbore by a constant-pressure line sink.
All participants consistently predict a decrease in the coning behavior with an increase in well length. However, variations in the predictions were observed. Although the modelling methods from different participants can be grouped into different categories, no trend in the predicted results, according to the methods used, could be observed.
