Abstract: The permanent packer is an essential tool for segment fracturing during shale gas exploitation. The structure of the slips directly affects its setting ability. For Y440 type packer, setting and sealing tests were carried out, and the results show that the packer exists slip during sealing operation, which may exacerbates slip and even slip off under the condition of shock and vibration in a wellbore. Finite element models were established based on nonlinear explicit dynamic analysis method. According to the comprehensive evaluation on the stress value, plastic deformation and the slippage of slips with the different tooth types, the results indicate that when the teeth dip angle is 20 degrees, vertex angle is 75 degrees, teeth width is 8mm and inner cone angle is 15 degrees is the relative optimal structure. A scientific basis for the design of packer slips was provided.

Key words: packer, slips, finite element analysis, structural optimization, simulation analysis