文章编号：1001-3482（2025）04-0064-08

Researchon Millingand Salvage Technologyfor Top Packer FailureinBohaiOilfield

GUO Minglong12，WANG Lizhi³， QI Yanlail2， JIANG Guangpeng （1.TianjinBrchOiad.ajin3059，na;StateKeyboratoryoffsorOilExploitatin 300459，China; 3.CNOOc Energy Technology amp; Services Limited， Tianjin 300459，China）

Abstract：As one of the core components of sand control pipe columns，the top packer is widely used in Bohai Oilfield，but its failureaffects operational eficiency.Forasmall number of wells that have not been able to recover the top packer through specialized tools，miling and salvage operations can effectively remove residual pipe columns underground to ensure subsequent operations.However， there are currently few successul cases of such operations.The engineering background of the failure of the packer in Well A1H of Bohai Oilfield and the practice of milling and salvage operations were introduced.The practical ideas for the mineafterthe packer failure were discussed，and the difficulties and improvement measures in miling operations were summarized. During the operation period，the entire milling process of Well A1H involved two drilling trips，with a total milling time of 19.5 h，a rate of penetration of 40～70r/min ，an additional weight on bit of 50～120kN ，and a milling footage of 1.55 m.By comparing the eficiency of milling operations in typical wells，experience in selecting drilling tools and optimizing driling parameters was proposed.The conclusion shows that the total time required for milling operations is relatively long，and the physical characteristics of diffrent operating parts are the main basis for selecting drilling parameters.In order to achieve a one ^- timecompletion ofmilling operations，it isnecessary to oflexibly adjust the milling parametersin the early stage of drilling to reduce the degree of gear miling wear.By optimizing operation parameters and tool combinations，the efficiency of milling operations can be significantly improved，and riskscan be reduced.The successful implementation of the top packer miling operation can provide references and ideas for subsequent related operations.

Key Words： Bohai Oilfield; top packer; setting failure; milling; salvage

渤海油田是我国重要的海上油气产区，区块储层岩性主要为疏松砂岩，具有易出砂的特性，使得防砂作业在渤海油田的开发过程中尤为重要[1-4]。机械防砂方法因其工况适应性强、机械结构稳定、控砂能力强且持续控砂时间长等优点，成为海上油气田防砂作业中最常用的措施[2-6]。顶部封隔器作为防砂管柱的核心组件之一，承担着悬挂筛管、密封管柱内外以及作业后丢手等重要功能，其需要销钉、卡瓦、芯轴、胶筒等零部件协同工作[6]。在渤海油田日益复杂的作业条件下顶部封隔器的失效问题时有发生，导致现场作业的延滞。

渤海油田的海上钻井平台日费高昂且井位有限，顶部封隔器的回收和套铣作业成为处理此类问题的重要手段[8-I]。日益复杂的应用条件以及大量的应用需求，顶部封隔器存在部件损坏从而导致失效的问题时有发生。以渤海油田A区块为例，在2024年出现顶部封隔器造成的复杂情况3次，主要失效形式包括卡瓦未伸出到位、橡胶破损或未完全涨开、总成滑套工具开关失效以及无法正常脱手或提前脱手等。目前常用的处理方式包括专用工具回收、重新下入顶部封隔器以及套铣打捞作业。套铣打捞作业能够有效清除井下残留管柱，但作业周期长、难度大，在渤海油田的应用案例较少。本文以渤海油田A1H井顶部封隔器坐封失效处理案例为研究对象，通过对其作业全过程进行详细描述，分析了顶部封隔器回收及套铣的作业实践过程，总结了套铣过程中的难点及改进措施，为后续相关作业提供借鉴依据和思路。……