基于油气相平衡的气顶底水油藏水平井垂向井位优化  

Vertical Well Position Optimization in Gas Cap and Bottom Water Reservoirs Based on Oil-gas Phase Equilibrium

作　　者：韩啸 江文博 唐斌 周晋冲 黄家曦 HAN Xiao;JIANG Wen-bo;TANG Bin;ZHOU Jin-chong;HUANG Jia-xi(China University of Petroleum(Beijing),Beijing 102249,China)

机构地区：[1]中国石油大学(北京),北京102249

出　　处：《承德石油高等专科学校学报》2023年第1期8-12,共5页Journal of Chengde Petroleum College

摘　　要：气顶底水油藏油气水三相同时赋存,水平井垂向位置不合理,则极易发生气窜和水锥,导致油井产能下降。为了有效控制气窜和底水锥进,延长水平井稳产时间,基于热力学相平衡理论,结合气顶底水油藏流体分布特点,校正了状态方程计算逸度误差,计算了油气体系相平衡闪蒸模型,利用天然气状态方程和物质平衡方程进一步推导出了气顶指数、底水倍数与地层压力的垂向水平井布井位置评价模型,总结了水平井开发过程中随油藏地层压力下降油气相间传质规律。经实例计算及数值模拟验证,采用本方法得到的布井位置可以有效延长水平井稳产时间,为气顶底水油藏水平井部署提供一定的借鉴意义。When three phases of gas,oil and water exist simultaneously in gas cap and bottom water reservoirs,gas channeling and water cone are easy to occur if the vertical position of horizontal wells is not proper,which can result in decline of oil well production.Based on thermodynamic phase equilibrium theory and combined with fluid distribution characteristics of gas cap and bottom water reservoir,this paper regulates the fugacity error calculated by the equation of state and calculates gas-oil system phase equilibrium flash model.Based on the equation of state of natural gas and the equation of material balance,the evaluation model of vertical well position of gas cap index,bottom water multiple and formation pressure are further derived,and the gas-oil interphase mass transfer law is summarized according to the decline of reservoir formation pressure during the development process.The example calculation and numerical simulation show that this method is effective in well placement and can effectively control gas channeling and water cone.The stable production time of horizontal well is prolonged through this method,which provides further reference for horizontal well deployment in gas cap and bottom water reservoirs.

关 键 词：相平衡 气顶底水 油环 水平井 垂向位置 稳产时间 

分 类 号：TE243[石油与天然气工程—油气井工程]