| Simulation of oil and gas flow in horizontal wells is much more complex than that for vertical wells. Traditional reservoir simulation usually treats horizontal wells as the simplified source/sink term, which could lead to erroneous performance predictions. Therefore, horizontal wellbore hydraulics and radial influx through perforations should be modeled as part of the reservoir simulation.;This research developed a 3-D, multiphase, fully implicit reservoir/wellbore coupled model with hybrid grid technique. Using this coupled model, the flow behavior in both reservoir and horizontal wellbore can be simulated simultaneously to reflect the flow characteristics and interactions between the reservoir and the horizontal wellbore.;The coupled model is used to study the transient flow behavior in the horizontal wellbore. Simulation results reveal finite conductivity and non-uniform influx distribution features in horizontal wellbore. Sensitivity analyses of reservoir permeability, initial gas saturation and perforation distribution are conducted using the developed reservoir and wellbore coupled model. |
