大斜度井投捞操作动力学模型及投捞器参数优化设计

大斜度井投捞是气举采油检阀和水井分注调配的关键技术。目前大斜度井投捞研究仅限于工艺和工具设计，缺乏相关的理论模型指导工作。因此，以大斜度井气举投捞操作为研究对象，利用动力学原理及不考虑钢丝拖曳和考虑钢丝拖曳两种情况下投送器下冲速度公式，建立了能量形式的大斜度井投捞操作动力学模型，分析了下冲剩余能与投捞段井斜、投送器直径、投送器长度的关系；并以投捞技术适应的最大井斜为目标建立了投送器参数优化设计模型，进行了相关设计计算，为目前大斜度井投捞工艺和相关工具研究提供了理论基础，对今后投捞技术的改进与提高提供参考。

Kinetic model of fishing in highly-deviated well and parameter optimization of fishing tool

Fishing in highly-deviated well is critical for valve inspection in gas lift oil production and for separated injection and allocation in water injection wells. The current researches in this aspect only focus on design of processes and tools, but there is no appropriate theoretical model available as a guide. In this paper, an energy-based kinetic model of fishing was established for highly-deviated wells which are developed by gas lift, using the kinetic principle and the formula of tool undershoot velocity with and without consideration to wireline towing. The relationships between the residual undershoot energy and the well deviation in fishing section and diameter/length of the fishing tool were analyzed. Moreover, a parameter optimization model of fishing tool was built on the basis of the maximum well deviation that the fishing technique can adapt to, and relevant calculations were made for the design. The results provide theoretical basis for current researches on fishing in highly-deviated wells and relevant tools, and also contribute to the future improvement of fishing technologies.