Effect of the friction coefficient for contact pressure of packer rubber

Ma, Wei-Guo; Qu, Baolong; Guan, Feng

doi:10.1177/0954406214525596

Cited by 37 publications

(19 citation statements)

References 13 publications

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“…Therefore, an axial load in the Y direction was applied to the press ring and the interaction property among the adjacent parts were set as contact type. The friction coefficient among the metal components was 0.1, the friction coefficient between the V-shaped sealing rings and the metal components was 0.3, and finally, the coefficient of friction among the V-shaped sealing rings was 0.45 [21].…”

Section: Two-dimensional Axisymmetric Simulation Modelmentioning

confidence: 97%

Sealing Failure Analysis on V-Shaped Sealing Rings of an Inserted Sealing Tool Used for Multistage Fracturing Processes

Wang

Dai

et al. 2018

Energies

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Abstract:The inserted sealing tool is a critical downhole implement that is used to balance the downhole pressure in multistage fracturing operations and prevent fracturing fluid from overflow and/or backward flow. The sealing ring of an inserted sealing tool plays an important role in downhole sealing since a sealing failure would ail the fracturing operation. In order to improve the sealing performance and reduce the potential fracturing failures, this research aims to investigate the influence of V-shaped sealing ring geometries on sealing performance. Constitutive experiments of rubber materials were carried out and the parameters of the constitutive relationship of rubber materials were obtained. A two-dimensional axisymmetric model considering the sealing ring has been established and influences are investigated with considerations of various system parameters and operating conditions. It is found that the stresses concentrated at the shoulder and inner vertex of the sealing ring have direct impact on the damage of the sealing rings under operational conditions. Moreover, the sealing interference, among several other factors, greatly affects the life of the sealing ring. A new design of the sealing ring is suggested with optimized geometric parameters. Its geometric parameters are the edge height of 5 mm, the vertex angle of 90 • -100 • , and the interference of 0.1 mm, which show a better performance and prolonged operation life of the sealing ring.

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Section: Two-dimensional Axisymmetric Simulation Modelmentioning

confidence: 97%

Sealing Failure Analysis on V-Shaped Sealing Rings of an Inserted Sealing Tool Used for Multistage Fracturing Processes

Wang

Dai

et al. 2018

Energies

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“…Deformation regularity and the law of contact pressure distribution with different hardness rubber materials were discovered by Li and Zhang [5]. Results from numerical simulation showed that coefficient of friction affected significantly on contact pressure between packing element and casing pipe [6].…”

Section: Introductionmentioning

confidence: 93%

Study on sealing capacity of packing element in compression packer

Wang

et al. 2018

J Braz. Soc. Mech. Sci. Eng.

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Sealing capacity of packing element is of great importance for compression packer. In this study, constitutive experiments and friction experiments of rubber material were carried out. Pressure penetration criterion was applied to numerical simulation model. In addition, a visible indoor experimental setup was established to verify the simulation model. Compressive deformation magnitude and sealing pressure difference capacity of packing element were obtained and compared in numerical simulation and experiment, which shows that the result in numerical simulation aligned with the experimental result. Compressive deformation magnitude and sealing pressure difference capacity both increase with the increase in axial load, but their growth trends are in different way. The study can offer some advices in predicting and improving the sealing capacity of packing element in compression packer.

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“…Our next task was to investigate effect of friction on contact stress profiles generated in conventional and expandable seal assemblies. Typical friction coefficient between elastomer and steel tubing is 0.3 or higher [29]. Figure 16 presents contact stress profiles in conventional seal assembly assuming friction coefficient of 0.3 at elastomer-pipe interface.…”

Section: Effect Of Frictionmentioning

confidence: 99%

Investigation of Elastomer Seal Energization: Implications for Conventional and Expandable Hanger Assembly

Patel

Salehi

2019

Energies

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Elastomer seals are extensively used in various wellhead and casing/liner hanger equipment as barriers for isolating fluids. Seal assemblies have been identified as one of the major cause of well control incidents. Majority of hangers utilize conventional weight- or mechanical-set slip-and-seal assembly. The objective of this paper is to conduct a detailed investigation of seal energization in conventional and relatively newer expandable type hanger seal assembly. To achieve the objective, the finite element modeling approach was employed. Three dimensional computer models consisting of concentric casings and annular elastomer seal element were constructed. Seal energization process was modelled by manipulating boundary conditions. Conventional seal energization was mimicked by applying rigid support at the bottom of elastomer element and compressing it from the top. Expandable hanger type seal energization was modelled by radially displacing the inner pipe to compress annular seal element. Seal quality was evaluated in terms of contact stress values and profile along the seal-pipe interface. Different amounts of seal energization were simulated. Both types of seal energization processes yielded different contact stress profiles. For the same amount of seal volumetric compression, contact stress profiles were compared. In case of conventional seal energization, contact stress profile decreases from the compression side towards support side. The seal in expandable hanger generates contact stress profile that peaks at the center of contact interface and reduces towards the ends. Convectional seal assembly has more moving parts, making it more prone to failure or under-energization. Finite Element Models were validated using analytical equations, and a good match was obtained. The majority of research related to elastomer seal is focused on material properties evaluation. Limited information is available in public domain on functional design and assessment of seal assembly. This paper adds novel information by providing detailed assessment of advantages and limitations of two different seal energization process. This opens doors for further research in functional failure modes in seal assembly.

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Effect of the friction coefficient for contact pressure of packer rubber

Cited by 37 publications

References 13 publications

Sealing Failure Analysis on V-Shaped Sealing Rings of an Inserted Sealing Tool Used for Multistage Fracturing Processes

Sealing Failure Analysis on V-Shaped Sealing Rings of an Inserted Sealing Tool Used for Multistage Fracturing Processes

Study on sealing capacity of packing element in compression packer

Investigation of Elastomer Seal Energization: Implications for Conventional and Expandable Hanger Assembly

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