The development efficiency analysis of the condensate gas reservoirs with middle-high permeability,Pinghu Field,the East China Sea

The gas reservoirs in Pinghu formation（Eocene） of Fangheting Structure in Pinghu Field in the East China Sea are condensate gas reservoirs with low-middle condensate gas ratio in middle-high permeabil-ity sandstones.It has been put into depletion production for 8 years since the March of 1999,its production is still stable now with daily gas production of 140×10⁴m³.Through researches on the present development and production performance of the Pinghu gas reservoirs,it is found the gas recovery rate was high,water free gas production period in gas wells was long,GOR raised and condensate content decreased with pressure depletion,and the recovery ratio was higher than the designed value of development scenario.It also shows that prevention of water and sand control in gas wells are very important in developing conden-sate gas reservoir with middle-high permeability.The development of condensate gas reservoirs of Pinghu Field is very successful in technological and economic aspects and can be used to similar gas reservoirs.