井下振动环境分析与模拟

Analysis and simulation of downhole vibration environment

智能导钻井下工具及仪器在钻进过程中产生复杂的振动,剧烈或长时间振动会造成井下仪器的电路故障与钻具机械疲劳破坏,引发钻井事故,增加钻井成本.为了验证井下仪器的振动环境适应性与可靠性,需要开展破坏机理、井下工况数据采集与分析、测试与试验的体系化研究,在实验室充分发现仪器潜在的故障,不断迭代升级,提升仪器可靠性.本文通过自主研制的井下振动冲击记录仪器在实钻井中采集真实的振动环境数据,对数据进行处理分析后,制定了三个方向的振动试验条件;定制研制了国内首台专门用于井下仪器测试的双台并激振动试验系统,研究了基于双台振动设备的并激振动试验与测试方法,实现了实验室条件下真实模拟井下振动环境,构建的系统化井下振动试验平台有效支撑了井下工具及仪器的高质量研发.

Intelligent-drilling downhole tools and instruments produce complex vibrations during drilling.Severe or long-term vibration will cause circuit failure of downhole instruments and mechanical fatigue damage of drilling collars,which will cause drilling accidents and increase drilling costs.In order to verify the adaptability and reliability of the vibration environment of the downhole instrument,it is necessary to carry out systematic research on the failure mechanism,data acquisition and analysis of downhole conditions,testing and experiments,fully discover the potential faults of the instrument in the laboratory,and continuously iterate and upgrade to improve the reliability of the instrument.In this paper,the actual vibration environment data are collected by the self-developed downhole vibration and shock recording instrument in the actual drilling.After analyzing and processing the collected data,the vibration test conditions in three directions are formulated.The first domestic dual parallel excitation vibration test system for downhole instrument testing was customized and developed.The co-excited vibration test method based on two vibration equipment is studied,and the real simulation of downhole vibration environment under laboratory conditions is realized.The systematic downhole vibration test platform effectively supports the high-quality research and development of downhole tools and instruments.