井下V形金属密封环密封性能研究

提出一种适用于井下复杂环境的V形金属密封环,利用压力密封装置模拟40 MPa压差工作环境,研究V形金属密封环在井下流量控制阀中的密封性能。将V形环的力学模型分解为圆筒过盈配合与悬臂梁力学模型进行理论分析,得出密封接触面的应力计算公式,并利用ABAQUS进行仿真验证。建立V形环两种密封面(曲面与平面)的轴对称模型,分析密封环在40 MPa压差下,不同过盈量与倾角对密封性能的影响,并对比2种结构的性能。结果表明,在满足密封性能的前提下,平面密封结构的过盈量取值范围更广,并且在相同结构参数时的接触应力大于曲面密封。确定平面密封结构过盈量与倾角的取值范围,为井下流量控制阀中V形金属密封环的设计提供了参考,应力计算公式也为密封环的设计提供了一个初步的接触面应力。

Study on Sealing Performance of Downhole V-shaped Metal Sealing Ring

A V shaped metal sealing ring suitable for underground complex environment was proposed,and the sealing performance of the V shaped metal sealing ring in the downhole inflow control valve was studied by simulating 40 MPa differential pressure working environment with a pressure sealing device.The mechanical model of V ring was divided into cylinder interference fit and cantilever beam mechanical model for theoretical analysis,a stress calculation formula of sealing contact surface was obtained and was verified by ABAQUS simulation.An axisymmetric model of the two sealing faces (planar seal and curved surface seal) of the V ring was established,the influence of different interference and inclination on the sealing performance was analyzed under the pressure difference of 40 MPa,and the sealing performance of the two structures was compared.The results show that on the premise of satisfying the sealing performance,the selection range of interference value of planar sealing structure is wider,and the contact stress under the same structural parameters is greater than that of curved surface sealing.The parameter selection range of the interference and inclination of the planar sealing structure was determined,which provides a reference for the design of V shaped metal sealing ring in downhole flow control valve.The stress calculation formula also provides preliminary stress for the design of sealing ring.