海洋平台液压抽油机机架的有限元建模与分析

Finite Element Modeling and Analysis of Hydraulic Pumping Unit Frame for Offshore Platform

针对电潜泵在海上稠油开采中效益低的问题,提出了一种新型海洋平台液压抽油机的整体设计方案。运用ANSYS对所设计的海洋平台液压抽油机的机架进行了建模与分析,采用自底向上的建模方法建立抽油机机架的实体模型,进行网格划分得到机架的有限元模型,分析了抽油机机架在不同地基和不同风载情况下的受力情况。通过ANSYS求解分析得出:在弹性地基情况下,上机架顶部的变形较大,更接近于实际工况;在不同风载情况下,最大应力均发生在上机架顶部,均能满足安全要求;有侧向风载时,上机架顶部的变形量最大,应根据常见的风向安装抽油机,尽量使抽油机承受正向风载,以减小风载对抽油机机架的影响。该设计方案为海洋平台液压抽油机机架的优化设计奠定了理论基础。

In view of the low efficiency of the electric submersible pump in offshore heavy oil production, the overall design scheme of new hydraulic pumping unit for offshore platform was proposed. The model for this pumping unit frame has been built and analyzed using ANSYS. Bottom-up modeling method is adopted to establish the solid model of the pumping unit frame, and meshing has been conducted to attain the finite element model of frame. The force son pumping unit frame under different foundations and wind loads have been analyzed. Based on the analysis of ANSYS, it is concluded that the deformation of the top of frame is greater under the elastic foundation, and more close to the actual working condition. In the case of different wind loads, the maximum stress occurs on the top of the frame,which can meet the safety requirements. The maximum deformation presents on the top of the frame under the condition of lateral wind load. The installation of the pumping unit frame should refer to the common wind direction to make the pumping unit face the wind direction so that to minimized the wind load impact on the frame. The design could provide theory bases for the optimization design of hydraulic pumping unit frame for off-shore platform.