锥形防喷器密封性能分析及结构改进  

Sealing Performance Analysis and Structure Improvement of a Conical Blowout Preventer

作　　者：姚方旭 刘洋[1,2] 孙龙飞 张思顿 YAO Fangxu;LIU Yang;SUN Longfei;ZHANG Sidun(School of Mechanical Engineering,Yangtze University,Jingzhou Hubei 434023,China;Sichuan Provincial Key Lab of Process Equipment and Control,Sichuan University of Science&Engineering,Zigong Sichuan 643000,China;PetroChina Coalbed Methane Company Limited Linfen Gas Production Management Area,Linfen Shanxi 042300,China;China United Coalbed Methane National Engineering Research Center Co.,Ltd.,Beijing 100095,China)

机构地区：[1]长江大学机械工程学院,湖北荆州434023 [2]四川轻化工大学过程装备与控制工程四川省高校重点实验室,四川自贡643000 [3]中石油煤层气有限责任公司临汾采气管理区,山西临汾042300 [4]中联煤层气国家工程研究中心有限责任公司,北京100095

出　　处：《润滑与密封》2024年第11期145-152,共8页Lubrication Engineering

基　　金：过程装备与控制工程四川省高校重点实验室项目(GK202310)。

摘　　要：以FH18-35GK锥形防喷器为研究对象,根据锥形防喷器工作原理,推导活塞的最大行程和锥形胶芯最大挤胶量计算公式;通过单轴拉伸和压缩实验,确定胶芯材料的本构模型为Yeoh模型,建立锥形防喷器的三维模型,运用CAE仿真软件模拟锥形防喷器工作时胶芯的力学行为,分析胶芯和支撑筋的应力及接触压力的分布规律。结果表明:活塞达到最大行程时,胶芯的最大应力分布在胶芯上部隆起位置的前段,支撑筋的最大应力分布支撑筋中板块与胶芯接触的圆角处和支撑筋下板块与活塞接触处;胶芯中部平整区是主要的密封区域,但FH18-35GK锥形防喷器胶芯中部主要密封区域的接触应力较小,不能有效密封钻杆。通过增大密封长度和胶芯锥角,对FH18-35GK锥形防喷器胶芯结构进行优化改进。结果表明:优化后胶芯和支撑筋的最大应力虽增加,但均在材料的屈服极限内,而胶芯和钻杆之间的接触应力增加了约42%,有效增强了锥形防喷器的可靠性。The FH18-35GK conical blowout preventer(BOP)was taken as the research object.According to the working principle of the conical BOP,the calculation formulas of the maximum stroke of the piston and the maximum rubber extrusion amount of the conical rubber core were derived.By uniaxial tensile and compressive experiments,the constitutive model of rubber core material was determined as Yeoh model.The three-dimensional model of cone-shaped BOP was established,and CAE simulation software was used to simulate the mechanical behavior of rubber core during the operation of a conical BOP.The distribution law of stress and contact pressure of rubber core and support rib was analyzed.The results show that the maximum stress of the rubber core is distributed in the front section of the upper bulge of the rubber core when the piston reaches the maximum stroke.The maximum stress distribution of the support rib is at the fillet where the plate in the support rib contacts the rubber core and at the contact between the plate under the support rib and the piston.The flat area in the middle of the rubber core is the main sealing area.But the contact stress of the main sealing area in the middle of the rubber core of FH18-35GK conical BOP is small,which cannot effectively seal the drill pipe.The rubber core structure of FH18-35GK conical BOP was improved by increasing the seal length and rubber core cone angle.The results show that although the maximum stresses of the rubber core and the support bar increase after optimization,they are all within the yield limit of the material,while the contact stress between the rubber core and the drill pipe increases by about 42%,effectively enhancing the reliability of the conical BOP.

关 键 词：锥形防喷器 结构优化 支撑筋 胶芯 密封性能 

分 类 号：TH136[机械工程—机械制造及自动化] TE938[石油与天然气工程—石油机械设备]