关键词: 桥塞, 坐封过程, 密封, 有限元, 动力学

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

Key words: bridge plug, setting process, seal, finite element, dynamics