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Structural Design and Sealing Performance Analysis of a Nanofluidic Self-Heating Unsealing Rubber Cylinder

Author

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  • Yafei Zhang

    (School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, China
    Xi’an Key Laboratory of Wellbore Integrity Evaluation, Xi’an Shiyou University, Xi’an 710065, China)

  • Taihao Fan

    (School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, China
    Xi’an Key Laboratory of Wellbore Integrity Evaluation, Xi’an Shiyou University, Xi’an 710065, China)

  • Pengbo Zhang

    (School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, China
    Xi’an Key Laboratory of Wellbore Integrity Evaluation, Xi’an Shiyou University, Xi’an 710065, China)

  • Yihua Dou

    (School of Mechanical Engineering, Xi’an Shiyou University, Xi’an 710065, China
    Xi’an Key Laboratory of Wellbore Integrity Evaluation, Xi’an Shiyou University, Xi’an 710065, China)

Abstract

As a crucial component for temporary blocking of layer segments in the segmental fracturing process, bridge plugs are difficult to unseal by conventional methods and may cause major downhole accidents if not handled properly. In this paper, a nanofluidic self-heating unsealing rubber cylinder is designed, which is equipped with a nanofluidic self-heating unsealing sandwich inside the conventional rubber cylinder, consisting of a nanofluidic system and an annular flexible heater. When unsealing, the nanofluidic self-heating unsealing sandwich is heated by the annular flexible heater, and the nanofluidic system can help the bridge plug rubber cylinder shrink in volume and unseal smoothly by the characteristics of heat shrinkage and cold expansion. The nanofluidic system, consisting of porous carbon with an exceptionally large specific surface area and glycerol, serves as a prime example for filling the sandwich layer, and the design parameters calculation was carried out. The sealing performance of the designed nanofluidic self-heating unsealing rubber cylinder was analyzed based on the Mooney–Rivlin principal structure by finite element modeling. The results show that the maximum contact stress between the nanofluidic self-heating unsealing rubber cylinder and the casing wall increases by 9.73%, the compression distance reduces by 24.47%, and the maximum equivalent force decreases by 12.17% on average compared with a conventional rubber cylinder under the same seating load. The designed nanofluidic self-heating unsealing rubber cylinder can satisfy the requirements of pressure-bearing capacity and sealing performance and performs better than a conventional rubber cylinder.

Suggested Citation

  • Yafei Zhang & Taihao Fan & Pengbo Zhang & Yihua Dou, 2023. "Structural Design and Sealing Performance Analysis of a Nanofluidic Self-Heating Unsealing Rubber Cylinder," Energies, MDPI, vol. 16(13), pages 1-11, June.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:13:p:4890-:d:1177336
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    References listed on IDEAS

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    1. Yafei Zhang & Jingwei Liang & Rui Luo & Shiwei Min & Yihua Dou, 2022. "Application Characteristics of Zeolite-Based Stuffing for Nanofluidic Packer Rubber," Energies, MDPI, vol. 15(21), pages 1-10, October.
    2. Jianping Wang & Hongjuan Jia & Jiachun You & Song Jiang, 2022. "Performance Analysis of Soluble Bridge Plug Materials for Fracturing in Unconventional Oilfields," Mathematical Problems in Engineering, Hindawi, vol. 2022, pages 1-7, May.
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