Study on Rubber Seal Design of a Swellpacker in Oil Well Cementing

Ma, Mingxin; Jia, Weijiang; Bu, Yuhuan; Guo, Shenglai

doi:10.4236/oalib.1101082

Cited by 3 publications

(4 citation statements)

References 9 publications

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“…The author modelled different teeth spacing in slip and examined how it affects risk of failure. Ma et al [24] used 2D FEA model of swelling elastomer packer element to investigate the effects of seal length, swelling amount, and different formation on seal quality and contact stress. They observed that in swellable elastomer packer equipment, contact stress profile peaks at the center of the element and declines towards both ends of the axial length.…”

Section: Literature Reviewmentioning

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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Section: Literature Reviewmentioning

confidence: 99%

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

Patel

Salehi

2019

Energies

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“…Nilai ini berdasarkan tekanan kerja maksimum untuk gasket karet yaitu 0,4-0,5 MPa [12]. Dengan asumsi safety factor 1,5 kali dari tekanan kerja maka didapatkan nilai 0,75MPa [13].…”

Section: Gambar 6 Area Kontak Gasket Terhadap Flangeunclassified

Optimasi Desain Gasket Karet Tipe Ring Profil C Flange Closed Groove dengan Metode Simulasi

Alamsyah

Choiron

Purnowidodo

2016

JRM

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“…To optimize the CPRT sealing effect, Hu et al 13 analyzed the influence of three kinds of rubber materials with different hardness on the CPRT sealing performance, and the constitutive model of three kinds of rubber materials was optimized based on the super elastic constitutive theory of rubber. Ma et al 14 analyzed the contact and shear stress distribution of down-hole CPRT, and the rubber structure is optimized for different formations. In high temperature and high pressure (HPHT) well, Lan et al 15 proposed a new type CPRT which is composed of single rubber cylinder with expansion ring and AFLAS material.…”

Section: Introductionmentioning

confidence: 99%

“…Ma et al. 14 analyzed the contact and shear stress distribution of down-hole CPRT, and the rubber structure is optimized for different formations. In high temperature and high pressure (HPHT) well, Lan et al.…”

Section: Introductionmentioning

confidence: 99%

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

Peng

Kuang

Yang

2021

Proceedings of the Institution of Mechanical Engineers, Part C:

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Compressed packer rubber is large deformation material, which endures biaxial contact friction between oil-pipe and casing-pipe in sitting and sealing process. Large-deformation theory analysis of rubber brings huge difficulties to solve, this is due to the material, geometry and contact non-linearity should be considered. In this article, the deformation of compressed packer rubber tube (CPRT) is divided into free deformation, unidirectional and bidirectional constrained deformations. Based on the theory of thick-wall-cylinder and the linear constitutive of rubber material segment, the CPRT mathematical model in different deformation processes is established and the influences of axial load, axial height of CPRT and contact friction coefficient of casing inner wall etc are considered. Based on incremental calculated approach, the mathematical model is solved. By comparing the results of the theoretical model with the results of finite element method and experimental results, it is found that the theoretical maximum contact stress is more conservative than the FEM and experimental solutions, so the sealing reliability of packer effectively predicted under the premise of allowable contact stress and the theoretical results can provide a lower limit reference value for the contact stress of the packer in the actual seal process. Meanwhile, the deviation of contact stress in FEM and theoretical value at z150 height of CPRT is among 1.13%∼4.90%, which can predict the contact stress in the compressed area near the stress concentration upper end-face of CPRT under the low friction factor, the results provide a reference for the compressed packer design.

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Study on Rubber Seal Design of a Swellpacker in Oil Well Cementing

Cited by 3 publications

References 9 publications

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

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

Optimasi Desain Gasket Karet Tipe Ring Profil C Flange Closed Groove dengan Metode Simulasi

A new incremental calculated approach to predict maximum contact stress of compressed packer in large deformation

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