Analysis and Experimental Research on Erosion of Cementing Sliding Sleeve
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摘要: 为准确分析套管固井滑套长时间在固液两相流中冲蚀后的磨损情况及可靠性，在进行冲蚀理论分析和数值模拟的基础上，利用研制的冲蚀磨损试验装置，研究了特定工况下固井滑套带孔短节的冲蚀磨损情况，分析了滑套孔眼冲蚀磨损速率与孔眼数量、砂比及排量的关系，建立了冲蚀磨损速率新模型，研究了滑套带孔短节孔眼过流能力与冲蚀磨损速率的关系；同时，结合数值分析结果和试验数据，得到了A型材质滑套短节的冲蚀磨损系数。研究结果表明，当滑套孔眼为2个时，含砂流体对滑套孔眼周边的冲蚀磨损较为明显，且滑套孔眼冲蚀磨损速率与砂比呈线性关系，与排量呈指数关系。该研究结果可为套管固井滑套可靠性评估提供理论依据，且能够指导滑套压裂工具的现场应用。Abstract: In order to analyze the wear rate and reliability of cementing sliding sleeve after high discharge,high sand-fluid ratio and long-term erosion of solid-liquid flow,downhole tools’ erosion and wear were researched based on the erosion theory and numerical simulation.The effects of the number of ports,sand concentration and displacement on the wear rate were analyzed.New test equipment was designed and built to test the erosion wear of port collar of cementing sliding sleeve under certain working conditions.A new model of erosion rate was established and more research was conducted about the flow capacity of port collar of cementing sliding sleeve and its effect on the rate of erosion wear.By combining numerical analysis and test data,the erosion coefficient of cementing sliding sleeve made by type A material was obtained.Results showed that the hole erosion was more severe when the cementing sliding sleeve contains two holes.The erosion rate had a linear relationship with sand concentration and an exponential relationship with fluid displacement.This research provided theoretical basis and foundation for cementing sliding sleeve reliability evaluation and guide for sliding sleeve application in oilfield.
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