Theoretical analysis of pressure-bearing performance on compression packer in low permeability reservoirs

Zhang, Yongfeng; Wang, Hanxiang; Che, Jiaqi; Du, Mingchao; Dou, Mingjie; Guo, Liang

doi:10.1016/j.ijpvp.2021.104325

Cited by 8 publications

(3 citation statements)

References 24 publications

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“…Most of these models calculate the contact stress at the interface between the rubber and casing (or formation) as a sealing indicator. Analytical models usually regard the setting process as a rubber sleeve compressed confined by two metal tubes or by a metal tube and the surrounding formation [10][11][12][13]. They pursue a closed-form solution describing the deformation and stress of the rubber.…”

Section: Introductionmentioning

confidence: 99%

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Comparative study on the sealing performance of packer rubber based on elastic and hyperelastic analyses using various constitutive models

Dong

Duan

2022

Mater. Res. Express

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Evaluation of the sealing performance of the packer rubber varies according to specific simulation models. This paper aims at revealing the difference between elastic and hyperelastic analyses using the finite element mothed (FEM). The study extracts the hyperelastic parameters of the neo-Hookean, the Mooney-Rivlin, and the Yeoh models from a uniaxial tensile test. Then, the setting process of a mechanical packer is simulated by elastic and hyperelastic calculations. We compare the deformed configuration and the contact stress given by these models. Our results show that the Yeoh model produces the minimum residual sum of squares (RSS) among the hyperelastic models for hydrogenated nitrile butadiene rubber (HNBR). The Mooney-Rivlin model has a negative parameter, making the calculation unstable. The linear elastic model fails to simulate the setting process, while the neo-Hookean model overestimates the contact stress. Despite the similar stress distribution, the nonlinear elastic model provides a 17.8% higher contact stress on average than the Yeoh model. A parametric study based on the Yeoh model points out that the sub-thickness of the packer rubber needs an elaborate design. Reducing the sub-thickness could increase the contact stress but decrease the seal length in the force control mode. From an engineering perspective, this study demonstrates that it needs to pay more attention when selecting an appropriate material model and a sound analysis method to evaluate the sealing performance of an oil packer.

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Section: Introductionmentioning

confidence: 99%

“…Using similar assumptions, Al-Hiddabi et al [11] gave a more sophisticated formula for pressure in the seal. Zhang et al [13] took advantage of the Love displacement function to determine the axial displacement for compression packers. The derived formula calculated the maximum shear stress in the rubber as a mechanical failure criterion.…”

Section: Introductionmentioning

confidence: 99%

Comparative study on the sealing performance of packer rubber based on elastic and hyperelastic analyses using various constitutive models

Dong

Duan

2022

Mater. Res. Express

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“…A series of studies was conducted on conventional mechanical packers [ 22 , 23 , 24 , 25 ]. The majority of studies focused on the mechanical properties of the sealing element, that is, the elastomer [ 26 , 27 , 28 ]. The primary properties are elastic modulus, tensile strength, elongation at break, stress relaxation, etc.…”

Section: Introductionmentioning

confidence: 99%

Evaluation on the Seal Performance of SMP-Based Packers in Oil Wells

Chen

Dong

2022

Polymers

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Packers based on shape memory polymers (SMPs) are an emerging technology that have the advantages of compact structure, easy manufacture, and adaptability to complex wells. This paper proposes a finite element model to simulate the setting process and mechanical response of an SMP packer. The investigated material is an epoxy-based thermal responsive SMP, whose relaxation modulus and thermal expansion coefficient were measured at different temperatures. Based on the experimental data, the model describes the viscoelastic behavior of the SMP using the generalized Maxwell model. The results show that the SMP packer could provide sufficient contact stress under downhole conditions, even after the stress was relaxed. A further parametric study revealed that the most significant factor in sealing effects is the wellbore pressure, followed by the interference between the packer and the annular, the seal length, the pre-compression, and the setting temperature. High downhole pressures require more significant contact stress and increase the risk of slip between the packer and casing wall by promoting shear stress. Increasing the seal length and interference enhances the contact stress and mitigates the shear stress to improve the seal performance. Pre-compression and setting temperatures are minor factors that have little influence on sealability.

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A time-dependent Yeoh model to predict the corrosion effect of supercritical CO2 on the HNBR sealing rubber

Jin

Cheng

et al. 2022

J Mech Sci Technol

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Theoretical analysis of pressure-bearing performance on compression packer in low permeability reservoirs

Cited by 8 publications

References 24 publications

Comparative study on the sealing performance of packer rubber based on elastic and hyperelastic analyses using various constitutive models

Comparative study on the sealing performance of packer rubber based on elastic and hyperelastic analyses using various constitutive models

Evaluation on the Seal Performance of SMP-Based Packers in Oil Wells

A time-dependent Yeoh model to predict the corrosion effect of supercritical CO2 on the HNBR sealing rubber

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