摘要
由于CT微观观察实验无法描述和定量表征凝析气在多孔介质中的相态特征的局限性,故使用引入毛管力改进的Peng-Robinson方程来定量表征多孔介质中的凝析气相态特征。首先在单孔中进行对凝析气的闪蒸相态模拟以及定容衰竭实验(CVD)模拟,探究考虑毛管力影响的凝析气相态特征及物性变化;其次在构建的反映不同孔喉连通状况的微观孔隙模型中进行凝析气体系的相态特征模拟研究。模拟结果显示反映真实储层特征的随机分形网络模型较之简易化的微观模型更能反映孔喉对凝析气体系相态综合影响,微观网络模型计算的露点压力和凝析油析出量均较高,进一步解释了多孔介质中凝析气体系的CT微观观察实验的实验现象。研究结果对凝析气藏相态特征及动态预测研究提供了理论支持。
Due to the limitations of CT microscopic observation experiment to describe and quantitatively characterize the phase state of the condensate gas in porous media,with the help of the improved Peng-Robinso equation by introducing the capillary force,the phase behaviors in porous media was quantitatively characterized.At first,the flash phase behavior of the condensate gas and the constant volume depletion(CVD)experiment were simulated in the single pore,the phase characteristics and physical property change of the condensate gas under the consideration of the capillary force were investigated.Secondly,the phase behavior simulation of the condensate gas system was studied in the established micro pore models reflecting different pore throat connectivities.The results show that the random fractal network model that reveals the true reservoir characteristics can better reflect the comprehensive influence of the pore throat on the system phase behaviors than the simplified micro model,and the dew point pressure and condensate oil volume calculated by the micro network model are pretty higher,the experimental phenomena of CT microscopic observation of the condensate gas system in the porous media are explained further.The study results provide the theoretical supports for the phase behaviors and dynamic prediction of the condensate gas reservoirs.
作者
王奥
李菊花
郑斌
WANG Ao;LI Juhua;ZHENG Bin((1.Petroleum Engineering College of Yangtze University, Wuhan 430100, China;Research Institute of Exploration and Development, PetroChina Xinjiang Oilfield Branch, Karamay 834000, China))
出处
《大庆石油地质与开发》
CAS
CSCD
北大核心
2021年第1期61-67,共7页
Petroleum Geology & Oilfield Development in Daqing
基金
国家自然科学基金项目“基于随机分形网络模型研究近井地带凝析油气非达西微观渗流机理”(51504039)
“十三五”国家科技重大专项“涪陵页岩气开发示范工程”(2016ZX05060-019)。
关键词
CT微观观察实验
凝析气
相态特征
毛管力
多孔介质
网络模型
CT microscopic observation experiment
condensate gas
phase behavior
capillary force
porous media
network model
