水平井分段压裂投球滑套冲蚀磨损规律研究

Erosion Mechanism Research of Ball-activitated Sliding Sleeve Applied in Horizontal Well Multistage Fracturing

投球驱动滑套分段压裂技术是非常规油气资源开发增产改造的关键技术,投球滑套是水平井压裂关键工具之一,而冲蚀磨损是投球滑套失效的主要原因。本文采用Fluent软件,通过建立球座的几何模型,研究了球座的锥角、锥段的结构形式以及设绕流部件的加设对球座冲蚀磨损规律的影响。结果表明,球座锥段磨损率随着球座锥角的增加而增加,综合考虑球座锥段长度,锥角30°为较为合理,锥段结构为凹面的球座锥段抗磨性能最优,加设绕流部件可有效的降低球座锥面的磨蚀程度,而绕流部件前置可大幅降低球座锥面的磨损。该研究结果为球座的设计提供了一定的理论指导。

Ball-activitated sliding sleeve multistage fracturing is the key technology applied in unconventional oil&gas development and reservoir stimulation.Ball-activitated sliding sleeve is one of key tool in horizontal fracturing.Erosion is the main reason of sleeve failure.It is researched in this paper that the effects of cone angle,configuration and addition of turbulent part are on erosion by ball-seat geometric model with Fluent software.Results show that erosion rate increases with cone angle,proper cone angle is 30 degree when length of cone part is taken into consideration.Concave is best in anti-erosion performance of cone surface.Turbulent part is effective in declination of erosion rate of cone.Cone erosion rate is lower when position of turbulent part is farther from cone.The results are principle guidance for design of ball seat.