中文摘要：

针对油气井中打捞公锥选型和造扣参数选择盲目，打捞周期长和成功率低等实际工程难题，该文基于大变形理论和虚功原理建立了公锥打捞油井钻杆落鱼的力学模型，并根据Johnson-Cook经验模型提出了打捞公锥造扣的弹塑性全过程分析与评价方法。此外，该文系统进行了钻压、转速、公锥硬度、公锥锥度、螺纹螺距、摩擦系数的参数敏感性分析，研究了各操作参数和特征参数对打捞公锥造扣能力和新扣连接强度的影响。实例分析中，该文给出了油井钻杆落鱼最适宜的打捞参数组合和公锥类型，并确定了各参数组合下公锥所造新扣的最大许用提升拉力。实验结果表明该文分析模型和评价方法具有合理性与普遍适用性。该文的研究工作为油气井打捞公锥的选择及优化设计提供了科学依据，对提高打捞效率和减少钻具落井等有重要的工程实际意义。

英文摘要：

In oil and gas wells, because the selection of fishing pin tap lectotype and tapping parameters is blind,the refloatation period is long, and the chance of success is small. Based on the theory of large deformation and principle of virtual work, the mechanics model of fishing is established, and then, on the basis of Johnson-Cook empirical model, the elastoplasticity analysis and evaluation method in whole process of fishing pin tap are also proposed. In addition, the parameter sensibility of axial load, rotate speed, pin tap hardness, pin tap taper, thread pitch, friction coefficient is researched, which affects the ability of tapping and link strength of the new thread. In the end, the best parameters and pin tap type are obtained in fishing process, and then the largest lifting power is computed under these combinations. The results show that the methods of the analyzing and evaluating model are reasonable. And also, the research provides the scientific basis for the selection and optimization of pin tap, which has important engineering significance in increasing fishing efficiency and decreasing the chances that drilling tools drop out the wells.