桥塞坐封过程仿真模拟研究

桥塞作为井下封层技术的关键设备，由于它施工工序少、周期短、卡封位置准确而得到了广泛应用。针对设计的可钻式非金属桥塞坐封过程开展模拟研究，涉及弹塑性材料接触、超弹性材料接触和非金属材料动态断裂的非线性动力学问题，利用有限元法建立该桥塞全尺寸模型和所有部件之间的广义接触关系，通过有限元模拟动态坐封过程获得桥塞各部件运动变形特性、桥塞与套管之间的密封特性和动态坐封力等数据，该桥塞坐封完成时，坐封机构部件轴向位移110 mm，坐封力约45 kN。模拟坐封也为进一步优化该型桥塞的结构和评估坐封性能提供了理论依据，对该型桥塞的推广应用奠定了基础。

Setting Process Simulation on Bridge Plug Research

The bridge plug is the key equipment of downhole sealing layer technology，which is widely used because of theadvantages of less construction process，short period，and accurate sealing position. The setting process of A-type drillable nonmetallicbridge plug was simulated which involvs the general contact of elastic-plastic material，the nonlinear dynamics of thesuper-elastic material contact and non-metallic materials，dynamic fracture. With the finite element method，we establish thegeneralized contact relationship between the full-size model of the bridge plug and all the parts. The finite element simulationresult includes dynamic movement and deformation characteristics of various components of the bridge plug，bridge plug andthe casing between the sealing characteristics and dynamic setting closure force data. The setting axial displacement of thebridge plug was 110 mm and setting force near 45 kN. The result was also a theoretical basis for further optimization of thestructure and assessment of the bridge plug and setting performance for application in oilfield.