Mechanical Behavior and Structure Optimization of Compressed PHP Packer Rubber

Liu, Junyan; Deng, Kailai; Liu, Shuang; Yan, Xi Feng; Li, Lili; Da-peng, Zou; Lin, Yuanhua

doi:10.1007/s11665-021-05686-4

Cited by 14 publications

(4 citation statements)

References 8 publications

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“…This is because the cylin undergoes free deformation at the initial stage, resulting in significant changes in co pression distance. The aforementioned finding is consistent with the results reported the literature [34]. With the further increase in load, it undergoes compaction and co pression with increasing difficulty, resulting in a reduction in compression distance.…”

Section: Analysis Of Simulation Resultssupporting

confidence: 93%

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

2023

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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.

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Section: Analysis Of Simulation Resultssupporting

confidence: 93%

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

2023

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“…The requirement for optimization arises from various factors including the ever-growing demand for high-performance products, the push for sustainable and efficient material utilization, and the competitive nature of the manufacturing industry [5] . Existing advanced computational tools and simulation software have made optimization possible to evaluate a plethora of design variations rapidly, enabling engineers to identify optimal solutions more efficiently than traditional trialand-error methods.…”

Section: Introductionmentioning

confidence: 99%

Research on mechanical structure optimization based on topology theory

Geng

2024

Fourth International Conference on Mechanical Engineering, Intelligent Manufacturing, and Automation Technology (MEMAT 2023)

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At present, structural topology optimization in mechanical equipment with excellent performance by optimizing the arrangement and distribution of materials in the design domain, which has important significance in the initial stage of mechanical material design. However, most of existing research on mechanical structure optimization concentrates on planar or simple three-dimensional structures, and can only solve some topology optimization problems with simple initial structure, optimized design domain rules, and single optimization constraints. In this paper, we extract a real mechanical bracket topology information and optimize the topology structure by utilizing the variable density method. After optimizing the topology, we compare our results with existing optimization methods and estimate the performance of different materials. From our extensive experiments, we can conclude that our proposed method can achieve the optimization process for mechanical components and outperform existing methods with acceptable stress and reasonable weights.

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“…As a result, a rubber packing element with a high temperature and a high pressure of 170 °C and 70 MPa, respectively, was obtained. Liu [ 15 ] established the finite element mechanical model of the packer with material nonlinearity, geometric nonlinearity and double-contact nonlinearity using finite element software, and obtained the contact pressure of rubber and its distribution, deformation, compression stroke and their relationship with axial load, which was verified by the measured test data. Fu [ 16 ] systematically studied the effects of the setting load, bottom hole temperature, rubber packing element length, rubber packing element thickness and friction coefficient between the rubber packing element and the casing on the mechanical response of the rubber packing element based on an orthogonal experimental design method.…”

Section: Introductionmentioning

confidence: 99%

Development of Rubber Packing Element for 105 MPa/215 °C Deep-Well Test Packer

Chen

Liu

2022

Materials

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The rubber packing element is one of the most important parts of deep-well test packers, but the existing rubber packing elements are insufficient to meet the requirements of field use as the stratum temperature and pressure rise as drilling becomes deeper. In this study, a rubber material formulation that meets the actual needs of the field (can withstand a high temperature and high pressure of 215 °C/105 MPa) was designed. Based on this, a mathematical model of the packer’s rubber packing elements was established, and its structure was analyzed using finite element software. Furthermore, the rubber packing elements produced according to this design were verified in an indoor simulation experiment. The results of structural analysis show that the best sealing was achieved when the end-face inclusion angle of the rubber packing element was set at around 40°, the length of the rubber packing element was between 60 and 80 mm, and the hardness was greater than or equal to 90 HA. Under the experimental conditions of 105 MPa and 215 °C, the experimental device stabilized at a pressure for 62 h and the pressure drop was 0.3 MPa, meaning that the elements passed the experiment and, thus, they can go through the setting-down process and function well in normal works. For the rubber packing elements with a sealing capacity and temperature resistance of 105 MPa and 215 °C, respectively, developed in this paper, their sealing reliability was verified through indoor simulation experiments, providing an important guarantee in terms of the smooth implementation of deep-well testing and the completion of operations at high temperature and high pressure.

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Mechanical Behavior and Structure Optimization of Compressed PHP Packer Rubber

Cited by 14 publications

References 8 publications

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

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

Research on mechanical structure optimization based on topology theory

Development of Rubber Packing Element for 105 MPa/215 °C Deep-Well Test Packer

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