VFPi垂直管流计算在油井压力梯度测试中的应用  

Application of VFPi vertical tube flow calculation in well pressure gradient measurement

作　　者：杜军社 杜佳闻 熊燕 严臣刚 DU Junshe;DU Jiawen;XIONG Yan;YAN Chengang(Xinkeao Petroleum Co.,Ltd.,Karamay,Xinjiang 834000,China)

机构地区：[1]新科澳石油天然气技术股份有限公司,新疆克拉玛依834000

出　　处：《油气井测试》2025年第1期69-72,共4页Well Testing

摘　　要：PVT取样中存在压力梯度曲线无脱气点或脱气点滞后并高含H_2S气体的一类油井,致使PVT取样深度难以确定。本文以井筒垂直管流理论为基础,应用Eclipse垂直管流VFPi模块作为工具,采用经校正流体关系式以及VFPi模块拟合开展了油井压力梯度和流态分析研究。应用结果表明,单相流计算压力与实测压力对比,相对误差小于10%;对于单相流油井,井口附近可作为PVT取样深度;对于多相流油井,以压力梯度变化大的脱气点作为PVT取样深度。该方法可大幅减小设备腐蚀,降低作业成本,加快试油进度。The sampling depth of PVT is difficult to determine because there is no degassing point or degassing point lag and high H2S gas content in PVT sampling.Based on the theory of vertical pipe flow in wellbore,this paper uses Eclipse VFPi module as a tool to analyze the pressure gradient and flow pattern of the well by using the corrected fluid relation and VFPi module fitting.The results show that the relative error between the calculated pressure and the measured pressure is less than 10%.For single-phase flow wells,the vicinity of the wellhead can be used as the PVT sampling depth;for multiphase flow wells,the degassing point with large pressure gradient variation can be used as the PVT sampling depth.This method can greatly reduce the corrosion of equipment,reduce the operation cost and speed up the oil testing progress.

关 键 词：PVT取样 梯度测试 VFPi 梯度计算 井筒流态 脱气点 取样深度 

分 类 号：TE353[石油与天然气工程—油气田开发工程]