摘要
为准确预测天然气开采中筛管保护套的冲蚀磨损速率和使用寿命,首先,根据储层及完井方式特征,建立冲缝管套筛缝流道模型;其次,利用离散相模型(DPM)模拟砂粒在气、液混合流体中对冲缝管套的冲蚀破坏过程,分析气、液和固三相流作用下筛缝壁面冲蚀速率随流体流速、含砂体积分数、液相体积分数和开口高度的变化规律;最后,根据筛管冲蚀情况,推导出基于最大冲蚀速率与允许冲蚀宽度的冲缝管套寿命预测模型,预测筛管寿命。研究结果表明:冲缝管套结构中最大冲蚀速度区域为筛缝底部边缘;管套的冲蚀速率随流速增加呈现指数增长趋势,随颗粒体积分数和液相体积分数增加呈线性增长趋势;管套预测使用寿命在速度增加的初始阶段下降明显,液相体积分数和颗粒体积分数增加及开口高度减小都造成使用寿命下降;减小开口高度引起筛管整体的过流面积降低,缝口处流速增大,导致筛管的冲蚀磨损更剧烈,使用寿命减小。
The purpose of the study is to accurately predict the erosion wear rate and service life of screen pipe protective sleeve in natural gas mining.Firstly,according to the reservoir and completion characteristics,the flow channel model of the screen was established.Secondly,the discrete phase model(DPM)was used to simulate the erosion failure process of sand particles in the gas-liquid mixed fluid against the punched screen.The variation of the erosion rate of screen wall under the action of gas,liquid and solid three-phase flow with the flow velocity,sand volume fraction,liquid volume fraction and opening height was analyzed.Finally,according to the erosion condition of screen pipe,the life prediction model of the punched screen based on the maximum erosion rate and allowable erosion width was deduced to predict the life of screen pipe.The results show that the biggest erosion rate part of the punched screen structure is the edge area near the opening surface at the bottom of screen.The erosion rate of the punched screen increases exponentially with the increase of flow rate.It shows a linear increase trend with the increase of sand volume fraction and liquid volume fraction.The predicting service life of the punched screen decreases obviously at the initial stage of increasing speed.The predicting service life decreases with the increase of liquid volume fraction and particle volume fraction and the decrease of opening height.The decrease of the opening height reduces the overall flow area of the screen,resulting in the increase of flow velocity at the slot,the erosion wear of the screen is more severe and the predicting service life decreases.
作者
邓福成
黄斌
尹彪
李小森
易先中
DENG Fucheng;HUANG Bin;YIN Biao;LI Xiaosen;YI Xianzhong(School of Mechanical Engineering,Yangtze University,Jingzhou 434000,China;Guangzhou Institute of Energy,Chinese Academy of Sciences,Guangzhou 510640,China;Guangzhou Natural Gas Hydrates Research Center,Chinese Academy of Sciences,Guangzhou 510640,China;Key Laboratory of Natural Gas hydrate,Chinese Academy of Sciences,Guangzhou 510640,China)
出处
《中南大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2022年第3期1023-1032,共10页
Journal of Central South University:Science and Technology
基金
国家自然科学基金资助项目(51504040,51974035,U1762214,U1262108)
湖北省重点研发计划项目(2020BAB055)。
关键词
天然气水合物
储层出砂
冲缝管套
冲蚀速率
寿命预测
natural gas hydrate
reservoir sand producing
punched screen
erosion rate
life prediction
作者简介
通信作者:邓福成,博士,教授,从事岩石力学、油气井完井防砂研究,E-mail:dengfucheng128@163.com。
