高温高压高产气体封隔器卡瓦力学行为的分析与实验  

Analysis and Experiments on the Mechanical Behavior of High-Temperature High-Pressure High-Production Gas Packer Kava

作　　者：李良庆[1] 巨雄 梁月松 贺育贤 易先中[2] 霍寒旭 王田玉 LI Liangqing;JU Xiong;LIANG Yuesong;HE Yuxian;YI Xianzhong;HUO Hanxu;WANG Tianyu(China Oilfield Service Ltd.,Tianjin 300459,China;School of Mechanical Engineering,Yangtze University,Jingzhou Hubei 434023,China)

机构地区：[1]中海油田服务股份有限公司,天津300459 [2]长江大学机械工程学院,湖北荆州434023

出　　处：《机床与液压》2024年第18期68-75,共8页Machine Tool & Hydraulics

基　　金：中海油集团公司关键核心技术研究项目(CNOOC-KJGJHXJSGG YF 2020-01)。

摘　　要：为了提高海上“三高”气井管柱的安全性,确保卡瓦良好的工作性能,以HPC070401封隔器双向筒式卡瓦为例,将滑移线理论法、数值模拟和实验法相结合,研究卡瓦咬入过程的力学行为,分析卡瓦与套管的接触应力分布规律、卡瓦牙咬入套管的深度和疲劳寿命,建立了封隔器卡瓦系统工作可靠的充分必要准则。研究结果表明:坐卡压力增加,卡瓦牙咬入套管的深度也随之增加,在坐卡压力为35、42、48、55 MPa时,卡瓦咬入套管深度为0.25993、0.29425、0.32353、0.36561 mm;坐卡压力增加,卡瓦牙尖局部塑性变形增大,在坐卡压力35、42、48、55 MPa下,对称循环波动20%时,卡瓦疲劳循环次数为951110、789540、717160、629260;通过高温高压封隔器卡瓦锚定实验,卡瓦咬入套管的实测深度介于0.350~1 mm之间,与有限元模拟结果较吻合;结合评价准则和高温高压封隔器疲劳实验可知,套管因疲劳累积损伤产生的应力松驰系数为0.18。In order to improve the safety of the tubular column in offshore"three high"gas wells and ensure the good working performance of the kava,the HPC070401 packer bi-directional cartridge kava was used as an example.The mechanical behavior of kava biting process was studied by combining the slip line theory method,numerical simulation and experimental method,the contact stress distribution law between kava and casing,the depth of kava teeth biting into casing and fatigue life were analyzed,and the sufficient and necessary criterion of reliable work of packer kava system was established.The results of the study show that:the sitting card pressure increases,the depth of kava teeth biting into casing also increases,with the sitting card pressure of 35 MPa,42 MPa,48 MPa,55 MPa,the depth of kava biting into casing is 0.25993 mm,0.29425 mm,0.32353 mm,0.36561 mm.The sitting card pressure increases,the localized plastic deformation of the kava tooth tip increases,with the sitting card pressure of 35 MPa,42 MPa,48 MPa,55 MPa,under the symmetric cycle fluctuation of 20%,the number of fatigue life cycle of the kava is 951110,789540,717160 and 629260.Through the high temperature and high pressure packer kava anchoring experiment,the measured depth of kava biting into casing is between 0.350 mm and 1 mm,which is in good agreement with the finite element simulation results.Combined with the evaluation criterion and the fatigue experiment of high temperature and high pressure packer,the stress relaxation coefficient of casing caused by fatigue cumulative damage is 0.18.

关 键 词：咬入深度 疲劳寿命 双向筒式卡瓦 高温高压封隔器 

分 类 号：TE938[石油与天然气工程—石油机械设备]