关键词: 高温高压凝析气藏, 凝析水, 数值模拟, 水气比, 相间传质, 东方气田

Abstract: To address the issues of condensate water output rising in high temperature and high pressure (referred to as the HPHT)condensate gas reservoirs in the South China Sea,Dongfang Gas Field is taken as the research object.By using the method of formation water evaporation experiment,water/gas ratio tests were conducted in PVT cells and long cores under formation conditions,and the calculation method for condensate water output in HPHT condensate gas reservoirs was proposed to predict the output rate of condensate water in Dongfang Gas Field.The research indicates that the fluid in HPHT condensate gas reservoir is affected by the small pore size of the porous medium and the shifting of critical properties,the saturated vapor pressure of which is altered, resulting in a significant increase in the production of condensate water.The numerical simulation method considering the interphase mass transfer between water and gas can be accurately predicted the variation of the condensate water output in HPHT condensate gas reservoir. Daily water production of Dongfang Gas Field was simulated with the bottom hole flowing pressurelimit of 1.5 MPa and the prediction time of 5 a.The accuracy of history in water output was over 90%, the condensate water output can be clearly predicted by the method.This study is of guiding significance for formulating a reasonable development plan and improving the development effect in HTHP condensate gas reservoirs.

Key words: HTHP condensate gas reservoir, condensate water, numerical simulation, water-gas ratio, interphase mass transfer, Dongfang Gas Field