多层压裂充填施工管柱侧向出流孔冲蚀损坏机理及结构优化  

Erosion damage mechanism and structural optimization of lateral outflow holes on multi-layer frac-packing completion string

作　　者：徐凤祥[1] 刘洪刚 王浩宇 张伦 徐海珍 董长银[2] 李经纬 XU Fengxiang;LIU Honggang;WANG Haoyu;ZHANG Lun;XU Haizhen;DONG Changyin;LI Jingwei(Oilfield Production Division,Tianjin Branch,COSL,Tianjin 300450,China;School of Petroleum Engineering,China University of Petroleum(East China),Qingdao,Shandong 266580,China;China Tianchen Engineering Corporation Ltd.,Tianjin 300400,China)

机构地区：[1]中海油田服务股份有限公司油田生产事业部,天津300450 [2]中国石油大学(华东)石油工程学院,山东青岛266580 [3]中国天辰工程有限公司,天津300400

出　　处：《中国海上油气》2025年第2期220-230,共11页China Offshore Oil and Gas

基　　金：国家自然科学基金项目“非均质疏松砂岩储层水平井砂液(水)协同产出剖面动态演化机制及模拟(编号:52074331)”部分研究成果。

摘　　要：海上油田多层压裂充填施工管柱的侧向出流孔的冲蚀损坏问题较为严重,显著影响管柱使用寿命。针对出流孔冲蚀机理不明确且缺乏结构优化依据的问题,使用现场实际施工材料和泵注条件,开展了管柱出流孔冲蚀损坏模拟实验。结果表明:砂比与排量对冲蚀速率影响最大,黏度影响相对较小;出流孔间的返溅作用加速了冲蚀过程,在排量22 m^(3)/h、砂比80%条件下,出流孔平均冲蚀速率达到0.05 g/h,说明携砂液砂比与排量以及不同出流孔之间的返溅作用是影响出流孔侧向冲蚀的重要原因。基于冲蚀损坏模拟实验结果并结合金属表面微观分析,构建了冲蚀损坏程度评价方法,并提出尖端侧向切削机理、端面侧向切削机理及颗粒返溅正面啃噬机理三种冲蚀破坏机理。基于冲蚀损坏机理与规律,提出两项结构优化方案,即增厚保护套2.5 mm及出流孔倾斜角度改为38.42°。优化实验结果表明,优化后方案可延长出流孔使用寿命约30%。本研究为非常规低渗透储层的水力压裂增产改造,以及中高渗储层的多层压裂充填防砂施工管柱结构优化提供了直接依据。The erosion damage to lateral outflow holes on multi-layer frac-packing completion strings of offshore oil fields is a severe problem that significantly affects the service life of the completion strings.To address the lack of understanding of the erosion mechanism of outflow holes and the absence of structural optimization guidelines,this study conducted simulation experiments to investigate the erosion damage to the outflow holes by using actual field construction materials and pumping conditions.The results indicate that the sand ratio and the delivery rate have the most significant impact on the erosion rate,while viscosity has a relatively minor effect.Additionally,the rebounding effect between different outflow holes accelerates the erosion process.Under conditions of a delivery rate of 22 m^(3)/h and a sand ratio of 80%,the average erosion rate of the outflow holes reaches 0.05 g/h,which confirms that the sand ratio,the delivery rate,and the inter-hole rebounding effect are the primary factors influencing lateral outflow hole erosion.Based on the results of simulation experiment of erosion damage and microscopic analysis of metal surface,an erosion damage evaluation method was developed,and three erosion damage mechanisms were proposed:tip lateral cutting,end-face lateral cutting,and frontal chipping by rebounded particles.Considering these mechanisms and erosion patterns,two structural optimization schemes were proposed:increasing the protective sleeve thickness by 2.5 mm and optimizing the outflow hole inclination angle to 38.42°.Experimental verification confirms that the optimized design extends the service life of the outflow holes by approximately 30%.This study provides direct guidance for structural optimization of completion strings in multi-layer frac-packing sand control operations in medium-to-high permeability reservoirs,as well as hydraulic fracturing stimulation in unconventional low-permeability reservoirs.

关 键 词：多层压裂充填防砂管柱 侧向出流口 冲蚀损坏机理 影响因素 结构优化 

分 类 号：TE53[石油与天然气工程—油气田开发工程]