苏里格气田气井凝析油对泡排携液能力影响分析  

Analysis of impact of condensate on liquid carrying capacity of foam lift in gas wells in Sulige Gas Field

作　　者：辛磊 陈天应 孟凡臣 刘孟鹏 陈焱 XIN Lei;CHEN Tianying;MENG Fanchen;LIU Mengpeng;CHEN Yan(Oil and Gas Cooperative Development Branch,CNPC Bohai Drilling and Engineering Co.,Ltd.,Tianjin 300280,China)

机构地区：[1]中国石油集团渤海钻探工程有限公司油气合作开发分公司,天津300280

出　　处：《油气井测试》2023年第5期24-29,共6页Well Testing

基　　金：苏里格合作区块含水层排水采气工艺技术研究(2021ZD26Y-02)。

摘　　要：苏里格气田含凝析油气井生产中,凝析油的存在会降低起泡剂起泡能力并加速泡沫衰减,严重影响泡沫排采技术现场应用效果。为提高含凝析油气井的泡排效果,利用动态携液法在室内开展不同凝析油含量的地层水对泡排携液能力影响的实验,模拟井筒积液从井底被携带至地面的演化过程,对实验现象进行机理分析,并优化改进起泡剂加注量公式。结果表明,随着凝析油含量的增加,泡沫携液能力不断下降;0~20%含量的凝析油对携液能力影响相对较弱,返排率大于80%,返排率环比平均降低2.33%,这表明起泡剂可将表面张力远小于地层水的凝析油乳化,并有效降低凝析油对起泡剂的抑制作用;20%~40%含量的凝析油对携液能力影响相对较强,返排率小于80%,返排率环比平均降低9.13%,这表明未被起泡剂乳化的凝析油严重抑制泡沫生成。经苏X-9X井现场应用取得良好排液增产效果,该分析为苏里格地区气井积液治理提供新思路。During the production process of gas wells containing condensate in the Sulige Gas Field,the presence of condensate reduces the foaming ability of the foaming agent and accelerates foam decay,significantly affecting the on-site application effectiveness of foam lift technology.To improve the foam lift efficiency in gas wells containing condensate,experiments were conducted indoors using the dynamic fluid carrying method to investigate the impact of formation water with varying condensate content on liquid carrying capacity of foam lift.The experiments simulated the evolution of liquid accumulation in the wellbore being carried to the surface,and the observed phenomena were analyzed for their underlying mechanisms.Additionally,the formula for the injection volume of the foaming agent was optimized and improved.The results show that as the condensate content increased,the liquid carrying capacity of foam continuously decreased.The impact of condensate content with a range from 0%to 20%on liquid carrying capacity was relatively weak,with a flowback ratio exceeding 80%.The flowback ratio decreased by an average of 2.33%compared to the base case,indicating that the foaming agent could emulsify the condensate,which had a much lower surface tension than formation water,effectively reducing the inhibitory effect of condensate on the foaming agent.The impact of condensate content between 20%and 40%on liquid carrying capacity was relatively strong,with a flowback ratio below 80%.The flowback ratio decreased by an average of 9.13%,indicating that the unemulsified condensate severely inhibited foam generation.The on-site application of these findings in the Well SuX-9X achieved significant improvements in liquid drainage and production enhancement,which may provide a new approach for liquid control in gas wells in the Sulige region.

关 键 词：苏里格气田 凝析油 泡沫排水采气技术 起泡剂 返排率 表面张力 消泡性 携液能力 

分 类 号：TE377[石油与天然气工程—油气田开发工程]