During the completion of shale gas wells, bridge plug debris and debris particles are often left at the bottom of the well, which are difficult to clean up, pose a serious risk to wellbore operations, and reduce productivity. In order to solve the difficulty of cleaning the debris at the bottom of the well, a kind of wellbore cleaning tool is proposed based on the principle of negative jet pressure and liquid-solid two-phase flow theory. The finite element analysis method and laboratory test were used to verify the function of cleaning tools: the finite element method can effectively reflect the principle and process of dredging bottom debris with cleaning tools. In order to improve the applicability and fishing ability of wellbore cleaning tools, factors influencing the performance of cleaning tools were analyzed as follows: choosing high-density and low-viscosity working fluid is beneficial to improve the negative pressure effect of cleaning tools. Under the conditions of wellbore safety and economy, increasing pump pressure and displacement and reducing annular pressure can effectively increase the fishing performance of cleaning tools.

中文翻译：

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真空吸井清洁工具捕捞性能的模拟与实验研究

在页岩气井完井过程中，桥塞残渣和碎屑通常留在井底，难以清理，给井筒作业带来严重风险，并降低了生产率。为了解决清理井底残渣的困难，提出了一种基于负射流压力原理和液固两相流理论的井筒清理工具。通过有限元分析法和实验室测试验证了清洁工具的功能：有限元方法可以有效地反映清洁工具疏通底泥的原理和过程。为了提高井筒清洁工具的适用性和捕捞能力，对影响清洁工具性能的因素进行了如下分析：选择高密度低粘度的工作液有利于提高清洁工具的负压效果。在井眼安全，经济的条件下，增加泵压，增加排量，降低环压可以有效提高清洁工具的打捞性能。