压裂球座冲蚀磨损规律研究和结构优化  

Study on erosion law and structure optimization of fracturing ball seat

作　　者：向正新 李思行[1,2,3] 钱利勤 夏成宇[1,2,3] 涂忆柳 

机构地区：[1]长江大学机械工程学院,湖北荆州434023 [2]湖北省油气钻完井工具工程技术研究中心,湖北荆州434023 [3]非常规油气湖北省协同创新中心,湖北武汉430100

出　　处：《工程设计学报》2017年第5期555-562,共8页Chinese Journal of Engineering Design

基　　金：国家自然科学基金资助项目(51405032);石油天然气装备教育部重点实验室资助项目(OGE201403-06);长江大学青年人才基金资助项目(2015cqr15)

摘　　要：针对压裂球座锥段处冲蚀磨损严重将影响滑套的开启和压裂施工正常进行的问题,基于固液两相流和冲蚀理论,建立了压裂球座冲蚀模型,分析了球座冲蚀磨损原因。采用控制变量法,分析了压裂液排量、颗粒浓度、颗粒直径、黏度对球座冲蚀磨损的影响。通过分析可知:随着压裂液排量和颗粒浓度的增加,球座冲蚀速率增大;随着颗粒直径和黏度的增加,球座冲蚀速率减小。为减少球座冲蚀磨损,分析了不同锥角和结构形式的球座锥段冲蚀速率;得出锥角在20°~30°范围内最为合理,锥段为凹面结构和双角度结构的球座,其冲蚀速率都较小。分析结果对水平井投球滑套分段压裂技术的改进和现场压裂施工具有指导意义。The sliding sleeve can＇t be opened and the fracturing operation can＇t work well for the serious erosion of cone surface of the ball seat for fracturing.The model of ball seat for fracturing was established and the causes of erosion were analyzed based on the theory of solid-liquid twophase flow and erosion.The influences of erosion for ball seat were studied in displacement,particle concentration,particle size and viscosity of fracturing fluid by the method of controlling variables.Through the analysis,the erosion rate of the ball seat was increased with the increase of displacement and particle concentration of fracturing fluid.The erosion rate of the ball seat was decreased with the increase of particle diameter and viscosity of fracturing fluid.In order to reduce ball seat erosion,the erosion of different cone angle and the structure of the ball seat were analyzed,which indicated that the angle of 20°-30°was the most reasonable for cone surface of ball seat,and the erosion of ball seat was low with the cone surface of concave structure and double angle structure.It is expected that the results can be used to improve horizontal well ball staged fracturing technique and guide the fracturing operation.

关 键 词：水平井 分段压裂技术 冲蚀磨损 球座 

分 类 号：TE357[石油与天然气工程—油气田开发工程]