在海洋弃井作业中，浅水作业区域是依据扭矩骤降判断套管被切断；而在对现场深水套管切割资料研究中发现，即使套管被切断，扭矩也不会突然降低。针对以上问题，设计了一种深水套管切割装置，从理论和试验2个方面研究了该装置的水力特性。研究结果显示，在同一切割状态下，随着入口流量的增大，活塞前、后的压降增大；在相同流量下，工具在刚开始切割套管时的压降约为完全割断套管时的⅟�，理论分析与试验结果非常接近。研究结果验证了湍流模型的准确性以及工具设计的合理性，为现场判断套管是否被割断提供了理论依据和试验参数。%In marine abandonment operations, the casing cutoff in the shallow water area is usually deter⁃mined by the sudden torque fall�But analysis on the casing cutting data in deep water operations shows that sudden torque fall would not happen when the casing is cut off�To address the issue, a deepwater casing cutting device has been designed�Theoretical and experimental studies have been conducted on the hydraulic characteristics of the de⁃vice�The results show that, at the same cutting state, the differential pressure before and after the piston increases with the increase of the inlet flow rate�Given the same flow rate, the pressure drop of the tool at the beginning of casing cutting is half of the pressure drop of complete casing cutoff�The theoretical analysis is closely consistent with the experimental result�The results indicate the accuracy of turbulence model and the reasonableness of the de⁃signed tool, providing theoretical basis and test parameters for the onsite judgment of casing cutoff.
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