Failure analysis and optimization method research on sealing of deep shale gas ultra-high-pressure fracturing packer rubber

Abstract

The contact pressure distribution computation model was established to evaluate the internal and external sealing performance of packer rubber. And the results show that the internal sealing performance of packer rubber may be lower than the external side. The weights of the key parameters which influence the internal and external sealing performance of the rubber tube are obtained by calculation. The optimized structural parameters are obtained by genetic algorithm, and the sealing performance is increased by 21%. The research work is significant to improve the packer’s sealing performance and adapt deep shale gas wells ultra-high pressure fracturing conditions.

Design and research on ultra-high pressure sealing structure based on tight plug ring

“…Huang et al (2022) designed an ultra-high pressure rotating combined dynamic sealing device and verified its intact dynamic sealing performance under ultra-high pressure conditions through experimental measurement and analysis [1] . Dong & Liu (2022) established a calculation model for the distribution of contact pressure inside and outside the packer rubber cylinder, calculated the key parameter weights that affect the sealing performance inside and outside the rubber cylinder, and optimized the structural parameters using genetic algorithm, resulting in a 21% improvement in sealing performance [2] . Wang et al (2022) designed a two-stage ultra-high-pressure sealing structure that combines a labyrinth clearance seal and self-sealing seal, calculated the pressure reduction value of the first stage labyrinth clearance seal on leaked high-pressure water, designed an ultra-high pressure pump test and verified the reliability and service life of the ultra-high pressure seal [3] .…”