摘要
针对水平井裸眼封隔器投球滑套分段压裂技术在施工过程中出现压裂携砂液对滑套球座冲蚀磨损的问题,采用欧拉多相流理论和Finnie微切削理论,建立压裂液对滑套球座冲蚀的液固两相双流体数学模型,结合实际工程模拟不同砂比、粒径、排量等因素对球座冲蚀磨损速率的影响,并进行失效分析和现场应用。分析结果表明,压裂携砂液冲蚀球座最严重的部位发生在滑套前端锥面;施工排量对球座冲蚀磨损的影响最大,且磨损速率与排量成指数关系;粒径次之,冲蚀磨损速率随支撑剂直径的增大而减小;砂比对球座冲蚀磨损的影响最小。该球座冲蚀磨损规律为非常规油藏水平井分段压裂施工方案的优化提供了理论依据。
To address the ball seat erosion caused by the slurry during horizontal well fracturing by openhole packer and fracturing sleeve, the liquid-solid two-phase two-fluid mathematical model of the fracturing fluid erosion on the ball seat is established based on Eulerian multiphase flow theory and Finnie micro-cutting theory. The effects of the factors like the sand ratio, particle size and displacement on the wear rate of the ball seat are ana- lyzed. Failure analysis and field applications are then conducted. The results show that： the most serious erosion oc- curs on the front taper of the sleeve. The displacement has the greatest impact on the ball seat erosion with an expo- nential relationship. The effect of the particle size is less. The erosion rate decreases with the increase of proppant diameter. Sand ratio has the minimum effect on the erosion rate. The study on the ball seat erosion provides theoreti- cal bases for the unconventional reservoir horizontal fracturing operation optimization.
出处
《石油机械》
北大核心
2014年第12期75-78,共4页
China Petroleum Machinery
基金
中国石油集团新疆大庆重大专项"试油及储层改造关键技术研究"(2012E-31-14)
关键词
分段压裂
滑套球座
冲蚀磨损
欧拉模型
数值模拟
staged fracturing
sleeve ball seat
erosion
Euler model
numerical simulation
