储气库Y型井口携砂采气临界冲蚀模拟研究  

Critical Erosion Simulation of Sand-carrying Gas Production at Y-shaped Wellhead of Gas Storage

作　　者：贺梦琦 杨炎鑫 檀德库[3] 王江宽 段吉彬 于晓聪 阚长宾 HE Mengqi;YANG Yanxin;TAN Deku;WANG Jiangkuan;DUAN Jibin;YU Xiaocong;KAN Changbin(Gas Storage Company of PetroChina Liaohe Oilfield,Liaoning Panjin 124010,China;School of Earth Resources,China University of Geosciences(Wuhan),Wuhan 430074,China;PetroChina Liaohe Oilfield Company,Liaoning Panjin,124010,China)

机构地区：[1]中国石油辽河油田储气库公司,辽宁盘锦124010 [2]中国地质大学(武汉)资源学院,武汉430074 [3]中国石油辽河油田分公司,辽宁盘锦124010

出　　处：《表面技术》2024年第11期160-170,共11页Surface Technology

基　　金：国家自然科学基金(52004259)。

摘　　要：目的研究储气库携砂采气过程中储气库生产通道冲蚀磨损的主要影响因素及规律。方法在辽河油田双6储气库注采井管柱结构和生产工况条件下,开展室内冲蚀模拟实验和生产通道冲蚀数值模拟研究,通过数值分析,明确采气速度、生产压力、出砂速率、出砂粒径对管柱冲蚀速率的影响规律。结合临界冲蚀理论计算结果,设计适用于出砂工况条件下储气库生产通道临界冲蚀系数取值的图版。结果出砂速度、采气速度、生产压力在管柱冲蚀中起着主要作用,实验数据与预测结果的一致性较高,管柱最大冲蚀速率与日产气量的二次幂、井筒内压力的负二次幂、出砂速率的一次幂成正比。此外,管柱变径部位的冲蚀速率随着服役时间的延长呈下降趋势,最终与管壁的冲蚀速率基本保持在相同数量级。根据构建的临界冲蚀系数取值图版,在当前储气库出砂工况条件下,为了保证储气库满足服役年限,将临界冲蚀系数(C)取值为180,进一步考虑到储气库的最大产能情况,推荐C介于175~200之间。结论通过储气库管柱冲蚀的实验模拟和数值模拟研究,建立了储气库注采井管柱的冲蚀速率模型,构建了储气库注采管柱临界冲蚀系数设计图版,有利于工程技术人员准确判断实时生产工况条件下储气库注采管柱的生产工况负荷、服役安全工况条件等,可以提供关键的实时性、安全性基础数据。The working system of"strong injection and strong production"in the production process of gas storage will easily lead to the erosion of pipe string,which will result in the failure of wellhead pipe string and bring hidden dangers to the safe operation of gas storage.The work aims to determine the erosion law of pipe string in the production process of gas storage,accurately predict the erosion rate of wellhead pipe string and identify the safety of pipe string.Based on the pipe string structure and production conditions of the injection-production well in Shuang-6 gas storage in Liaohe Oilfield and according to the theoretical model of gas-solid two-phase flow,the standard k-εturbulence model was used to calculate the hydrodynamic characteristics of the continuous phase,describe the kinematic state and trajectory of discrete particles through the discrete model,and study the injection-production process of the gas storage and the wellhead erosion law under the conditions of different injection-production parameters.The numerical simulation results showed that the maximum erosion rate of different parts of the pipe string decreased nearly exponentially with the increase of production pressure.The maximum erosion rate of different parts of the string increased nearly exponentially with the increase of gas production rate.The maximum erosion rate of different parts of the string increased linearly with the increase of sand production rate.In addition,the erosion rate of the variable diameter part of the pipe string showed a downward trend with the increase of service time.When the chamfer of the variable diameter part of the pipe string was 5°,the erosion rate of the variable diameter part decreased,and finally it was basically the same as the erosion rate of the pipe wall.The erosion angle was set at 90°,the sand production particle size was 0.10-0.25 mm,and the sand production rate was 0.1-5.0 g/s.The experimental results showed that the sand blasting erosion test was carried out.The results showed that the nu

关 键 词：储气库管柱 冲蚀规律 Y型井口 冲蚀速率图版 管柱安全 临界冲蚀 

分 类 号：TH117[机械工程—机械设计及理论] TE931[石油与天然气工程—石油机械设备]