永久式封隔器卡瓦断裂模拟分析

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英文篇名：Fracture Simulation Analysis of the Slips in Permanent Packers 作者：蔡萌 ; 张倩 ; 李朦 ; 王鹏 ; 刘照义 英文作者：Cai Meng;Zhang Qian;Li Meng;Wang Peng;Liu Zhaoyi;Research Institute of Production Engineering,Daqing Oilfield Co. Ltd.,PetroChina;College of Mechanical Science & Engineering,Northeast Petroleum University; 关键词：永久式封隔器 ; 卡瓦 ; 断裂模拟 ; 模拟分析 ; 数值模拟 英文关键词：permanent packer;;slip;;fracture;;simulation analysis 中文刊名：CJDL 英文刊名：Journal of Yangtze University(Natural Science Edition) 机构：中石油大庆油田有限责任公司采油工程研究院;东北石油大学机械科学与工程学院; 出版日期：2019-04-25 出版单位：长江大学学报(自然科学版) 年：2019 期：v.16;No.248 基金：国家自然科学基金项目(51704074) 语种：中文; 页：CJDL201904009 页数：6 CN：04 ISSN：42-1741/N 分类号：6+55-59

摘要

卡瓦是永久式封隔器的核心部件,其性能直接影响封隔器锚定是否可靠。永久式封隔器卡瓦起到锚定套管、锁定封隔器胶筒的作用,卡瓦结构对封隔器承压密封性能尤为重要,采用室内坐封、锚定试验和数值模拟相结合的方法,提高永久式封隔器整体性能。首先,通过设计室内试验方案,获得了永久式封隔器卡瓦锚定载荷范围,验证了卡瓦锚定可靠性。将室内试验获得的坐封载荷作为模拟坐封载荷,采用LS-DYNA数值模拟软件,通过合理设置模拟条件,获得了永久式封隔器卡瓦初次、二次、三次断裂临界应力值,以及裂纹扩张趋势及断裂形态。室内试验和数值模拟综合分析结果表明,30MPa坐封载荷条件下封隔器坐封锚定效果良好,且室内试验中卡瓦断裂形态与数值模拟结果一致,数值模拟分析的准确性也为永久式封隔器卡瓦结构设计提供了科学依据。
        The slip is the core component of the permanent packer,and its performance directly affects the anchor reliability of the packer.The slip of the permanent packer is used to anchor the casings and lock the packer.The slip structure is especially important for the sealing performance of the packer.The research methods of laboratory tests and numerical simulation are combined to improve the overall performance of the permanent packer.First of all,the scheme of the laboratory tests is designed,the anchor load range of the permanent packer slip is obtained,and the reliability of its anchor is verified.Taken the setting load of laboratory tests as the simulation boundary conditions,the values of the first,the second,the third critical fracture stress of the permanent type packer slip are obtained by numerical simulation software LS-DYNA,meanwhile the trends of expansion of cracks and fracture morphology are well known.Comprehensive analysis of laboratory tests and numerical simulation results show that packer setting anchor effect is good under the condition of 30 MPa setting load,and slip fracture morphology in laboratory tests is consistent with the results of numerical simulation.The accuracy of the numerical simulation analysis provides a scientific basis for slip structure design of the permanent packer.

引文

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