SOME PROBLEMS IN DEVELOPMENT AND PRODUCTION OF GAS CONDENSATE RESERVOIRS

The problems existed in traditional model of condensate and gas distribution in gas condensate reservoirs are pointed out in the paper.Three-zone model of flow in porous media is recommended,and multi-zone and multi-phase model of condensate and gas distribution in gas condensate reservoirs is firstly presented.The varying characteristics of dew point pressure and condensate and gas relative permeability during different development and production phases are analyzed.The concept of condensate and gas relative permeability varying with production is introduced into gas condensate well test analysis.The analysis methods of transient well test and production well test based on multi-zone and multi-phase condensate and gas distribution model are advanced.The present problems in determining production pressure difference of gas condensate reservoirs are indicated and principles and method to acquire reasonable production pressure difference are emphasized.