Development of a Comprehensive Well Performance Assessment in a Giant Gas Condensate Field

Summary Productivity loss due to condensate blockage is the main and common problem in gas condensate reservoirs around the world. In this paper, a comprehensive framework is developed to assess the performances of the different well trajectories in a giant field. The studied field is one of the world’s largest gas condensate fields located in the Middle East and has been produced for more than ten years from four non-communicating layers in Kangan-Dalan formations. A comprehensive comparison between the vertical well and the deviated well was performed using surface testing, production history, and reservoir simulation data. Based on the surface well testing, IPR curves show the better performance of the deviated well. It is concluded from the simulation results that, on the one hand, development of a deviated well in the gas condensate field delays the emergence of the dew point pressure, results in longer production plateau period, and delivers more cumulative production of the gas and the condensate in the life of the well. On the other hand, the vertical well causes higher condensate saturation around the well and more severe reduction in relative permeability of gas phase and productivity index of the well below the dew point pressure.