超高压下闸板防喷器胶芯密封性能研究及结构优化  

Research on the Sealing Performance and Structural Optimization of Pipe Rubber Core of the Ram Blowout Preventer Under Ultra-high Pressure

作　　者：蒋发光[1,2] 肖华 徐睿晗[3] 郭旭阳 JIANG Faguang;XIAO Hua;XU Ruihan;GUO Xuyang(School of Mechatronic Engineering,Southwest Petroleum University,Chengdu Sichuan 610500,China;MOE Key Laboratory of Petroleum Equipment,Chengdu Sichuan 610500,China;Northeast Sichuan Gas Mine,PetroChina Southwest Oil and Gas Field Company,Dazhou Sichuan 635000,China)

机构地区：[1]西南石油大学机电工程学院,四川成都610500 [2]石油天然气装备教育部重点实验室,四川成都610500 [3]中国石油西南油气田分公司川东北气矿,四川达州635000

出　　处：《润滑与密封》2024年第12期90-97,共8页Lubrication Engineering

基　　金：中国石油天然气集团公司重大科技专项(2021ZG08)。

摘　　要：为探究140 MPa超高压下闸板防喷器管子胶芯的密封性能,依据超弹性体大变形理论和数值模拟方法,在研究闸板防喷器管子胶芯与闸板、钻杆的接触关系基础上,建立胶芯密封性能的分析模型,分析在液压缸驱动力、140 MPa高压钻井介质作用下管子胶芯的密封性能,研究胶芯核心参数偏心距、垫铁半径及胶芯厚度对密封性能的影响规律,得出胶芯结构的优化参数,并对不同的胶芯唇面结构进行密封性能评价。结果表明:胶芯密封薄弱区域位于胶芯圆弧面与端平面交界处;在140 MPa高压介质作用下胶芯出现应力集中和“密封过度”现象,将导致胶芯的使用寿命急剧降低;胶芯的有效接触应力随着偏心距、垫铁半径、胶芯厚度的增大而减小,最大等效应力随偏心距的增大而增大,随胶芯厚度的增大而减小,随垫铁半径的增大先下降后升高;综合矩形、圆弧形、倒角型三种胶芯唇面结构的接触应力与等效应力,倒角型唇面胶芯最优。采用最优的胶芯唇面结构和核心参数值对管子胶芯进行结构优化后,胶芯高应力区域减少,最大应力降低了16.7%、有效密封面积提升了34.9%。To investigate the sealing performance of the pipe rubber core of the ram blowout preventer(BOP)under 140 MPa ultra-high pressure,according to the hyperelastic large deformation theory and numerical simulation method,the contact relationship between the rubber core,ram and the drill pipe of ram BOP was studied.The analysis model of the rubber core sealing performance was established,and the sealing performance of the rubber core under the action of hydraulic cylinder driving force and 140 MPa drilling medium was analyzed.The influence of structural parameters of the rubber core such as eccentricity,the shim radius and the rubber core thickness on sealing performance was studied,and the optimized parameters for the rubber core structure were obtained.The sealing performance of different structures of the lip surface of rubber core was evaluated.The results illustrate that the weak position of rubber core seal is located at the junction of rubber core arc surface and end plane.Under the action of 140 MPa drilling medium,the rubber core appears"over-sealing"and stress concentration,which will lead to a sharp decrease in the service life of the rubber core.The effective contact stress of the rubber core decreases with the increase of eccentricity,shim radius,and rubber core thickness.The maximum equivalent stress increases with the increase of eccentricity,decreases with the increase of rubber core thickness,and first decreases and then increases with the increase of shim radius.Taking into account the contact stress and equivalent stress of the three types of lip surface structures,namely rectangular,circular arc,and chamfered,the chamfered lip surface rubber core is the most optimal.After optimizing the structure of the pipe core using the optimal lip structure and core parameter values,the high stress area of the rubber core is reduced,the maximum stress is reduced by 16.7%,and the effective sealing area is increased by 34.9%.

关 键 词：闸板防喷器 管子胶芯 密封性能 结构优化 弹性体大变形理论 

分 类 号：TB42[一般工业技术] TE931[石油与天然气工程—石油机械设备]