基于PVT实验的凝析气藏衰竭开发采收率标定新方法
New Method for Calibrating Recovery of Gas Condensate Reservoirs Based on PVT Experiments
石美雪 1鹿克峰 1张春光 1王睿 1路颖 1马恋1
作者信息
- 1. 中海石油(中国)有限公司上海分公司 上海 200335
- 折叠
摘要
凝析气的等容衰竭实验与实际凝析气藏衰竭开发存在两点差异:实验初始压力为露点压力,而一般凝析气藏原始地层压力大于露点压力;等容衰竭实验中降压和产气分步进行,而实际为降压和产气同步进行.研究发现,以上两点差异对干气采收率预测影响不大,但会导致基于等容衰竭实验标定凝析油采收率严重偏低.为提高基于等容衰竭实验标定凝析油采收率预测精度,通过组合凝析气两相压降方程、凝析油产量方程及井流物标况体积定义式,并考虑地露压差的影响,建立一套基于等容衰竭实验标定定容凝析气藏衰竭开发采收率新方法.该方法在实际矿产应用中准确性较高,对于预测凝析气藏采收率具有重要指导意义.
Abstract
There are two differences between constant volume depletion(CVD)experiments and real depletion of gas condensate reservoirs:The CVD experiment is performed starting from the dew point,while the initial pressure of a gas condensate reservoir is usually greater than the dew point;The pressure reduction and gas production are carried out alternately in CVD experiments.In contrast,the pressure is decreased simultaneously as gas is produced during the real depletion process.It is found that the above two differences have little impact on predicting dry gas recovery rates,but can lead to significantly lower calibration of condensate recovery rates based on CVD experiments.In order to improve the prediction of condensate recovery in CVD experiments,a new method for calibrating the recovery of gas condensate reservoirs based on CVD experiments is established by considering the differences between the initial reservoir pressure and the dew point and combining the two-phase pressure decline equation,condensate oil production equation,and definition of fluid volume at standard condition.This new method works well in real cases and is of great significance to the recovery prediction of gas condensate reservoirs.
关键词
凝析气藏/等容衰竭实验/条件差异/采收率Key words
gas condensate reservoir/constant volume depletion(CVD)experiment/condition difference/recovery efficiency引用本文复制引用
基金项目
中海石油(中国)有限公司上海分公司科研项目(CCL2023SHPS004PC)
出版年
2024
NETL
NSTL
万方数据