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sealing performance and Optimization of a Subsea Pipeline Mechanical Connector

Chinese Journal of Mechanical Engineering 2018年第1期31卷 142-155页

作者： Li-Quan Wang Zong-Liang Wei Shao-Ming Yao Yu Guan Shao-Kai Li College of Mechanical and Electrical Engineering Harbin Engineering University Advanced Manufacturing Research Centre with Boeing The University of Sheffield

Researchers seldom study the optimum design of a mechanical connector for subsea oil-gas pipeline based upon the sealing performance. An optimal design method of a novel subsea pipeline mechanical connector is presented. By analyzing the static metal sealing mechanism, the critical condition of the sealing performance is established for this connector and the formulation method of the contact pressure on the sealing surface is created. By the method the minimum mean contact pressure of the 8.625 inch connector is calculated as 361 MPa, which is the constraint condition in the optimum design of *** finite element model is created in ANSYS Parametric Design Language(APDL) and the structure is optimized by the zero-order method, with variance of contact pressure as the objective function, and mean contact pressures and plastic strains as constraint variables. The optimization shows that variances of contact pressure on two sealing surfaces decrease by 72.41% and 89.33%, respectively, and mean contact pressures increase by 31.18% and 52.84%, respectively. The comparison of the optimal connectors and non-optimal connectors in the water pressure experiments and bending experiments shows that the sealing ability of optimized connectors is much higher than the rated pressure of 4.5 MPa, and the optimal connectors don’t leak under the bending moment of 52.2 kN·*** research provides the formulation to solve contact pressure on the sealing surface and a structure optimization method to design the connectors with various dimensions.

关键词： Mechanical connector sealing mechanism sealing performance Critical condition Minimum mean contact pressure Variance

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sealing performance and mechanical response of mud pump piston

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Petroleum 2023年第1期9卷 101-107页

作者： Jie Zhang Wenjie Jiang Pai Zhu Ting Zheng School of Mechatronic Engineering Southwest Petroleum UniversityChengdu610500China Oil and Gas Equipment Technology Sharing and Service Platform of Sichuan Province Chengdu610500China Luzhou Vocational and Technical College Luzhou646000China

In order to explore the effect of piston cup structure on its sealing characteristics and mechanical properties,a numerical simulation model of the piston cup in the BW-160 mud pump was *** of work load,friction coefficient and cup structure parameters on the sealing and mechanical properties of the piston were discussed under mud discharge *** results show that stress concentration on the root and lips of the cup is becoming more and more obvious with the working load *** average contact pressure increases with the friction coefficient increases,but an excessive friction coefficient accelerate the wear of the cup and the heat *** of the piston lip interference and thickness on the sealing performance of the cup is greater than that of the inner wall *** piston with groove structure can effectively improve the sealing performance of the *** mechanical properties of triangular groove cup are better than that of semicircular and trapezoidal groove cup.

关键词： Piston cup sealing performance Mechanical property Groove structure

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sealing performance analysis of rubber core of annular BOP:FEM simulation and optimization to prevent the SBZ

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Petroleum 2023年第3期9卷 419-426页

作者： Liangliang Dong Yuan Tang Geng Tang Hai Li Ke Wu Wei Luo School of Mechanical and Electrical Engineering Southwest Petroleum University610500ChengduChina Engineering Technology Research Institute of Southwest Oil&Gas Field Company 618300DeyangChina Aecc South Industry Company Limited Zhuzhou412002China Sichuan Shengnuo Oil&Gas Engineering Technology Service Co. Ltd.618000DeyangChina

The present work studies the influence of oil pipe joint passing through annular blowout preventer(BOP)on its sealing performance in high pressure gas wells under snubbing *** the oil pipe joint passes through the BOP,due to the change of its structure,it is easy to cause the rubber core seal failure of the BOP,resulting in the leakage of toxic and harmful gas in the well,which seriously threatens the safety of the *** at the problem of gas leakage caused by rubber core seal failure of annular BOP,based on the rubber large deformation theory and rubber core seal mechanism,a dynamic finite element model of rubber core-oil pipe joint is established,and the correctness of the model is verified by comparing the failure of rubber core on site;The results show that when the oil pipe joint passes through the BOP,a sealing buffer zone(SBZ)will be formed at the upper and lower shoulder of the joint,and the contact stress of the rubber core will decrease by 10 MPae30 MPa;Because of the funnel effect of the rubber core,the damage of the rubber core caused by the running oil pipe joint of the BOP is greater than that caused by the lift oil pipe joint;When lifting oil pipe,the existence of SBZ is easy to cause gas leakage in the well;The optimized structure of oil pipe joint with small inclination and long shoulder can significantly reduce the influence of SBZ on the sealing performance of *** research work in this paper is of great significance to improve the dynamic sealing performance of BOP.

关键词： Annular blowout preventer Hyperelasticity sealing performance Structural optimization FEM

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Effect of rotor-mounted protrusion on sealing performance and flow structure in rotor-stator cavity

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Chinese Journal of Aeronautics 2018年第11期31卷 2057-2072页

作者： Nan CAO Xiang LUO Zeyu WU Jie WEN National Key Laboratory of Science and Technology on Aero-Engine Aero-Thermodynamics School of Energy and Power EngineeringBeihang UniversityBeijing 100083China Collaborative Innovation Center for Advanced Aero-Engine Beijing 100083China

This paper presents an experimental investigation on the effect of protrusion radial position and height on the sealing performance and flow structure in the rotor-stator cavity. The rotormounted protrusions are assembled at three radial positions and are set to three heights. The cavity is equipped with three rim seals: a radial seal, an axial seal and a seal with double fins on the *** annulus Reynolds number is set at 4:39 ×10;and the rotational Reynolds number ranges from 7:51×10;to 1:20×10;. Heat and mass transfer analogy is applied. Pressure and CO;concentration are measured. The experimental results show that in cavities with different rim seals, radial distributions of the sealing efficiency, pressure and swirl ratio are basically the same. The sealing performance is improved by protrusions compared with the cavity without protrusion and improves with the increase of protrusion radial position and height. The effect of protrusion increases with the increase of the rotational Reynolds number. The windage loss and the flow resistance introduced by protrusions are investigated. It is found that induced windage loss and flow resistance decrease with the increase of protrusion radial position but increase with the protrusion height.

关键词： Height Protrusion Radial position Rim seal sealing performance

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Numerical Analysis of Magnetic Fluid sealing performance

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Journal of China University of Mining and Technology 2006年第1期16卷 53-56页

作者： ZHAO Meng ZOU Ji-Bin XU Yong-Xiang Department of Electrical Engineering Harbin Institute of Technology Harbin Heilongjiang 150001 China

The sealing performance of magnetic fluid is related to the magnetic fluid itself. Many factors can influence the magnetic field and the seal pressure differences of magnetic fluid seals, such as the sealing gap, the shaft eccentricity, the shaft diameter, the volume of the magnetic fluid and the centrifugal force. These factors are analyzed by numerical computation. When the seal material and structure are the same, the seal pressure difference is directly proportional to the magnetic field intensity and the saturation magnetization of the magnetic fluid. The sealing performance of the magnetic fluid will reduce with the increase of the sealing gap and shaft eccentricity. The sealing performance will increase with the volume of the magnetic fluid and decrease with the increase of the shaft diameter taking gravity into account. The increase of the shaft diameter is the same as the reduction of the volume of the magnetic fluid. The magnetic fluid cross-section can change because of the centrifugal force. Some improvements can reducc the influence of the centrifugal force. The centrifugal force can be utilized to improve the sealing performance.

关键词： magnetic fluid sealing performance numerical computation

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Analysis of Factors Affecting sealing performance of Subsea Wellhead Connector

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World Journal of Engineering and Technology 2022年第2期10卷 230-240页

作者： Liangliang Ding Miao Xian School of Mechanical and Electrical Engineering Southwest Petroleum University Chengdu China

Subsea wellhead connector is the key equipment for offshore oil and gas production. The working water depth is generally more than 500 m, so it has higher requirements for its sealing performance. In this paper, the VX gasket matched with H-4 subsea wellhead connector is taken as the research object, and the mechanical analysis under preload and production conditions is carried out. The finite element model of subsea wellhead connector is established by ABAQUS software, and the influence of axial preload, production pressure and material properties on the sealing performance of VX gasket is studied. The results show that the greater the axial preload, the greater the contact stress on the gasket surface;the contact stress decreases first and then increases linearly with the increase of production pressure;the material properties of the gasket are also an important factor affecting its sealing performance, 316L stainless steel is more suitable for gasket material than 304 stainless steel and Inconel625.

关键词： Subsea Connector sealing performance VX Gasket Contact Stress Finite Element Analysis

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ANALYSIS FOR THE EFFECT OF SHAPE OF CRIMPED PORTION UPON THE sealing performance OF HYDRAULIC BRAKE HOSE BY THREE-DIMENSIONAL FEM

ANALYSIS FOR THE EFFECT OF SHAPE OF CRIMPED PORTION UPON THE...

引用

第二届亚洲功能材料与结构力学大会

作者： Kento Ota Nao-Aki Noda Bongkee Kim Department of Mechanical Engineering Kyushu Institute of Technology1-1 Sensui-choTobata-kuKitakyushu-si804-8550 Japan

＜正＞Usually,automobile high-pressure hose,such as hydraulic brake hose,has been developed through investigating several actual prototype hoses ***,high durability for brake hose has been required because periodic renewing the brake hoses has not been requested *** this study, FEM stress analysis has been applied to the crimped portion of hydraulic brake hose in order to promote the development of the automobile hoses more *** sealing performance is discussed focusing on the normal stress between the nipple and inner rubber with varying several important geometrical dimensions of crimped portion.

关键词： Stress analysis Finite Element Method sealing performance Brake Hose Automobile

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Gas sealing performance test analysis of non-API casing connection with radial cone sealing structure

Gas sealing performance test analysis of non-API casing conn...

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2012年海峡两岸破坏科学/材料试验学术会议

作者： XU Zhiqian YAN Yifei JANG Tingting YAN Xiangzhen College of Mechanical and Electronic Engineering China University of Petroleum College of Pipeline and Civil Engineering China University of Petroleum

The metal-to-metal radial interference fit construction is the main sealing structure of the non-API casing *** sealing performance of the non-API casing connection is superior to the API casing because of the special sealing ***,the air tightness test has been done in order to find the sealing forming conditions and influencing *** main processing parameters of the test specimen are like the 7 inch casing *** main structure type is the cone-to-cone interference fit between two contact *** leakage rate was measured in the test under different contact pressure,different contact surface roughness and different contact *** test results analysis show that the higher initial contact pressure is a necessary requisite to air *** contact interface has occurred plastic deformation when the contact pressure close to 2 times metal yield *** this condition,the leakage rate is unchanged with the increasing of gas pressure,the gas sealing performance in a stable state. Comparing the gas sealing performance of the different contact surface form processes(turning, grinding and lapping),we find that different surface roughness has different contact pressure in stable sealing *** higher surface roughness come into stable sealing state much more quickly and easily comparing to the *** the same contact and gas pressure and the same surface roughness,the leakage rate decrease dramatically with the increasing of the contact width, and the effect on the sealing performance comes very small when the contact width more than 10 mm.

关键词： sealing performance Leakage Rate Non-API Casing Connection Air Tightness Test

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Interfacial friction effects on sealing performances of elastomer packer

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Petroleum Science 2024年第3期21卷 2037-2047页

作者： Peng-Cheng Wang Ming-Hui Chen Jim Jenkinson Yong-Xin Song Li Sun Department of Mechanical Engineering University of HoustonHoustonTX77024USA Guren Nanomaterials Suzhou215127JiangsuChina Department of Marine Engineering Dalian Maritime UniversityDalian116026LiaoningChina

Elastomer sealing performance is of critical importance for downhole tools application including the use of fracturing(Frac)plugs during multi-stage hydraulic *** practice sealing performances of such plugs are normally evaluated through pressure tests,and in numerical simulation studies,maximum contact stress,average contact stress and contact length data are used to determine sealing quality between a packer and *** previous studies,the impact of friction forces on sealing performance is often *** work aims to fill this knowledge gap in determining the influence of friction forces on elastomer packer sealing *** first determined the most appropriate constitutive hyperelastic model for the elastomers used in frac *** we compared analytical calculation results with Finite Element Analysis simulation using a simplified tubular geometry and showed the significant influences on interfacial friction on elastomer packer stress distribution,deformation,and contact stress after *** the demonstration of validity of FEA method,we conducted systematic numerical simulation studies to show how the interfacial friction coefficients can affect the maximum contact stress,average contact stress,contact stress distribution,and maximum mises stress for an actual packer used in plug *** addition,we also demonstrated how the groove in a packer can affect packer deformation and evolvement during setting with the consideration of interfacial *** study underscores the critical role that friction forces play in Frac plug performance and provides a new dimension for optimizing packer design by controlling interfacial interactions at the packer contact surfaces.

关键词： Elastomer seal Friction sealing performance Contact stress

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A Visco-hyperelastic Constitutive Model for Rubber Considering the Strain Level and One Case Study in the sealing Packer

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Acta Mechanica Solida Sinica 2023年第5期36卷 710-723页

作者： Lan Jin Demin Zhao Jianlin Liu College of Pipeline and Civil Engineering China University of Petroleum(East China)Qingdao 266580China

The rubber cylinder is a key component for maintaining the sealing pressure of the packer,particularly in deep underground *** stress relaxation of materials,as a typical feature of viscoelasticity,has become one of the main factors causing the failure of rubber cylinders in *** the present study,a visco-hyperelastic model for the sealing rubber considering different strain levels is proposed based on the Prony ***,the uniaxial compression stress relaxation experiments are conducted on the sealing rubber under different temperatures and strain levels,and the model parameters are thereby *** a case study,the proposed model is incorporated into the ABAQUS software via the UM AT subroutine,and the finite element simulation of the sealing packer is carried *** results show that the sealing performance of the packer improves with a decrease in temperature or an increase in strain *** is also noted that a large strain level can lead to the protrusion of the shoulder of the rubber cylinder.

关键词： Visco-hyperelastic model Temperature Strain level Rubber cylinder sealing performance

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