致密凝析气井多相流不稳定产量预测方法  

A transient production prediction method for tight condensate gas wells with multiphase flow

作　　者：白文鹏 程时清[1] 汪洋[1] 蔡玎宁 郭新洋 郭巧 BAI Wenpeng;CHENG Shiqing;WANG Yang;CAI Dingning;GUO Xinyang;GUO Qiao(National Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京)油气资源与工程全国重点实验室,北京102249

出　　处：《石油勘探与开发》2024年第1期154-160,共7页Petroleum Exploration and Development

基　　金：国家自然科学基金(52104049);中央高校基本科研业务费专项资金(2462022BJRC004)。

摘　　要：考虑凝析气藏相态变化、储集层中油气两相线性渗流和边界控制流,提出了致密凝析气井全路径油相饱和度与压力关系的预测方法,建立了致密凝析气井多相流不稳定产量预测模型。研究表明:凝析油饱和度和压力关系曲线是计算拟压力的关键,在生产初期或离井底较远地层压力较高区域,可利用实际生产井前期的生产动态数据,采用物质平衡模型进行计算;生产后期或离井底较近地层压力较低区域,可采用等组分膨胀实验数据进行计算;生产中期或地层压力位于中间水平时,则可根据前两段计算所得数据插值求得,形成完整的全路径油相饱和度和压力关系曲线。经模拟对比与矿场实例的验证,新方法具有较好的可靠性和实用性,可用于致密凝析气井生产中、晚期产量预测和单井可采储量的评估。Considering the phase behaviors in condensate gas reservoirs and the oil-gas two-phase linear flow and boundary-dominated flow in the reservoir,a method for predicting the relationship between oil saturation and pressure in the full-path of tight condensate gas well is proposed,and a model for predicting the transient production from tight condensate gas wells with multiphase flow is established.The research indicates that the relationship curve between condensate oil saturation and pressure is crucial for calculating the pseudo-pressure.In the early stage of production or in areas far from the wellbore with high reservoir pressure,the condensate oil saturation can be calculated using early-stage production dynamic data through material balance models.In the late stage of production or in areas close to the wellbore with low reservoir pressure,the condensate oil saturation can be calculated using the data of constant composition expansion test.In the middle stages of production or when reservoir pressure is at an intermediate level,the data obtained from the previous two stages can be interpolated to form a complete full-path relationship curve between oil saturation and pressure.Through simulation and field application,the new method is verified to be reliable and practical.It can be applied for prediction of middle-stage and late-stage production of tight condensate gas wells and assessment of single-well recoverable reserves.

关 键 词：致密储集层 凝析气 多相流 相态变化 不稳定渗流 拟压力 产量预测 

分 类 号：TE332[石油与天然气工程—油气田开发工程]