Multi-objective optimization and experiment of nylon cord rubber in expandable packer

Zhang, Yongfeng; Wang, Hanxiang; Che, Jiaqi; Du, Mingchao; Zhang, Hongjie

doi:10.1007/s12182-020-00539-6

Cited by 10 publications

(2 citation statements)

References 39 publications

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“…As the main sealing element of the annular packer, the sealing performance of the rubber cylinder directly determines the setting effect of the downhole packer, especially in high-temperature and high-pressure environments [10]. Zhang et al used a genetic algorithm to determine the optimal structural parameters of nylon cord rubber according to the field operation, which improved the sealing performance of the rubber cylinder [11]. Hu optimized the structural parameters of the rubber cylinder of the compression packer by analyzing the failure mechanism and provided a better selection of rubber materials [12,13].…”

Section: Introductionmentioning

confidence: 99%

Structure Design and Sealing Performance of Downhole Emergency Packer

Zhou,

Du,

Yin

et al. 2023

Advances in Transdisciplinary Engineering

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In the drilling process of offshore exploration wells and high-risk wells, the possibility of high-pressure overflow and kick increases greatly when encountering unknown or inaccurate formation conditions. If it is not handled properly, it may cause catastrophic accidents. Overflow and kick are the early warnings of blowout accidents, and the wellhead blowout preventer can be shut off first to cope with such emergency conditions. However, once the bottom hole high pressure spreads to the wellhead, it may bring safety risks to the wellhead emergency disposal. In this work, a new type of downhole packer while drilling was designed to quickly seal the annulus when high-pressure fluid appears underground. ABAQUS software is also used to simulate the sealing performance of the rubber cylinder, and analyze the stress changes of the rubber cylinder during the setting process. When the working stress is 10MPa, the maximum Mises stress of the rubber cylinder is 14.3MPa, and the contact stress of the rubber cylinder presents a “shoulder protrusion” distribution. By comparing the stress changes in the rubber cylinder with or without a metal skeleton, it was found that the overall contact stress with a metal skeleton will increase, which has a good impact on the sealing of the rubber cylinder.

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Section: Introductionmentioning

confidence: 99%

Structure Design and Sealing Performance of Downhole Emergency Packer

Zhou,

Du,

Yin

et al. 2023

Advances in Transdisciplinary Engineering

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“…Wang et al [9] found that the trapezoidal groove was the most proper shape for packer rubber, and the sealing property could be better when the bearing flow ring was installed inside the trapezoidal groove. Zhang et al [10] determined the best structural Energies 2022, 15, 7962 2 of 10 parameters of nylon cord rubber, which increased the load-bearing capacity of the packer by 25% and the sealing performance by 66%. Dong et al [11] proposed a high-pressure sealing anti-shoulder (HPS-PSP) packer, which effectively solved the problems of hose shoulder protrusion and insufficient sealing performance.…”

Section: Introductionmentioning

confidence: 99%

Application Characteristics of Zeolite-Based Stuffing for Nanofluidic Packer Rubber

et al. 2022

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Aiming at obtaining the application characteristics of more nanofluidic stuffing to enrich the database of nanofluidic packer rubber, three zeolite-based nanofluidic types of stuffing with water, glycerin, and a saturated aqueous solution of KCl (hereinafter referred to as saturated KCl solution) as the functional liquids were studied using experiments. The results showed that all the three zeolite-based nanofluidic stuffing types could be applied as stuffing for nanofluidic packer rubber. The setting pressure ranges for zeolite/water, zeolite/glycerin, and zeolite/saturated KCl solution stuffing were 21.71 to 30.62 MPa, 15.31 to 23.57 MPa, and 27.50 to 38.83 MPa, and the specific deformation quantities of the three stuffing types were 72.76, 102.07, and 77.54 mm3∙g−1, respectively. In zeolite/saturated KCl solution stuffing, the number of liquid molecules retained in the nanochannels was the minimum; thus, this stuffing type was the most stable during application. The order of the equivalent surface tensions of the three zeolite-based stuffing types in the confined nanochannels was consistent with the order of the gas–liquid surface tensions in the bulk phase. The equivalent surface tension, which reflected the interaction between liquid–solid phases, dominated the pressure threshold, the deformation capacity, and the stability of nanofluidic stuffing. This research study provided data support for the application of nanofluidic packer rubber.

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