The effects of well and reservoir parameters on horizontal and vertical wells performance in gas condensate reservoir

Predicting the effects of reservoir and well parameters on the performance of horizontal and vertical wells in retrograde gas-condensate reservoirs is important in determining the well type needed in a given formation. Due to increased number of horizontal wells drilled in retrograde gas-condensate reservoirs, there is a necessity for better and improved understanding of the behavior and performance of this type of wells in retrograde gas-condensate reservoirs.;The purpose of this research study is to investigate the effects of reservoir and well parameters on the performance of horizontal and vertical wells in volumetric retrograde gas-condensate reservoirs using three-dimensional, single-well compositional reservoir simulation model. To simulate the depletion processes, the single-well compositional reservoir simulation model is used to investigate the effects of reservoir and well parameters such as horizontal permeability, reservoir thickness, ratio of vertical to horizontal permeability (k _v/k_h), and horizontal well penetration ratio on the performance of horizontal and vertical wells.;Results indicate that, for the vertical well, the lower the values of horizontal permeability and formation thickness, the higher the average reservoir pressure at abandonment time. For the horizontal well, the lower the values of formation permeability, formation thickness, k_v/k_h ratio, and horizontal well penetration ratio, the higher the average reservoir pressure at abandonment time. The lower the values of horizontal permeability and formation thickness, and the higher the value of k_v/k _h and horizontal well penetration ratio, the better the performance of horizontal well over the performance of vertical well.;Simple algebraic equations are presented that can be used to calculate the abandonment time as a function of well and reservoir parameters. Results presented in tabular form can be used by reservoir engineers in order to select the appropriate well type in a given reservoir, to determine the recovery factors for gross-gas, free-gas and oil, and to determine the abandonment pressure and abandonment time.