摘要
在水平井压裂改造过程中,压裂球座的存在改变了流域的几何形状,进而影响了压裂液的流动状态,同时携砂压裂液在管道中快速运动,导致球座表面出现严重的冲蚀磨损现象,这使压裂球座的坐封配合性能下降,影响投球打开滑套以及后续压裂施工等操作的正常进行。基于CFD软件Fluent,建立了井下球座的流体动力学模型,分析了球座锥段角度、压裂液黏度和砂粒粒径等参数对井下流态以及球座表面冲蚀磨损速率的影响规律。模拟结果表明,磨损率的最大值出现在球座锥段与小圆柱段的连接处;球座表面冲蚀磨损率随着球座锥段角度的增大而快速升高,却随着压裂液黏度和砂粒粒径的增大而降低。
During the fracturing operation of horizontal well, the geometry is changed by fracturing ball seat, and the fracturing fluid carrying sand moves rapidly in the channel,which lead to the material loss on the surface of ball seat.The erosion of ball seat reduces the sealing performance,which impacts significantly on the shifting operation and subsequent operations. In this paper, the computational fluid dynamics model for ball seat was built based on the CFD software. The effect of parameters such as cone angle, fluid viscosity and sand diameter on the flow status and erosion rate was investigated. Numerical results indicate that the maximum erosion value occurs at the junction between cone surface and small channel.The erosion rate increases rapidly with the increase of cone angle, while decreases with the increase of fluid viscosity and sand diameter. This study provides theoretical guidance for staged fracturing technology of horizontal wells.
出处
《油气田地面工程》
2016年第5期14-18,共5页
Oil-Gas Field Surface Engineering
基金
中国石化科研项目“非常规油气固井完井连续分段压裂技术研究”(P13063)
关键词
分段压裂
球座
冲蚀磨损
数值模拟
staged fracturing
ball seat
erosion abrasion
numerical simulation
