石油钻柱顶部高频激振解卡耦合响应特性

采用顶部高频激振进行钻柱解卡具有操作简便、高效低成本的优点，但是解卡作业效果受到井下复杂环境的严重影响。将解卡装置和钻柱相结合，并考虑环境因素影响，建立解卡装置-钻柱系统耦合振动模型，据此揭示系统振动响应特性，以及钻井液黏度、卡点深度、井斜角及高频解卡装置的工作参数等因素对卡点处解卡力的影响特性，并结合特定工况确定最佳工作参数范围。研究结果表明：在高频激振解卡作业中，解卡效果的影响因素相互耦合；针对实际作业环境和钻柱结构，通过优化获得最佳的作业参数，可以有效地提高解卡效果。

Coupling response characteristics of drill string unfreezing by high-frequency excitation

The use of top high-frequency excitation for drill string unfreezing has the advantages of simple operation, high efficiency and low cost, but the effect of unfreezing operation is seriously affected by the complex downhole environment. Combining the unfreezing device with the drill string and considering the impact of environmental factors, this study establishes a coupled vibration model of the unfreezing device and drill string, so as to reveal vibration response characteristics of the system, and the influence characteristics of such factors as the viscosity of drilling fluid, the depth of free point, hole deviation angle, and working parameters of the high-frequency unfreezing device on the unfreezing force at the free point. Additionally, the optimal range of working parameter is determined according to specific working conditions. The research results show that in the unfreezing operation through high-frequency excitation, the influence factors of unfreezing effect are coupled with each other; according to the actual operating environment and drill string structure, the unfreezing effect can be effectively improved by obtaining the optimal operating parameters.