Evaluation of liner hanger seal assembly and cement sheath as a dual barrier system: Implications for industry standards

Ahmed, Shawgi; Salehi, Saeed; Ezeakacha, Chinedum Peter; Teodoriu, Cătălin

doi:10.1016/j.petrol.2019.04.017

Cited by 17 publications

(7 citation statements)

References 13 publications

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“…To model the gas flow through cement, the pressure squared method was used to overcome the limitation of the basic form of the diffusivity equation. The finite volume approach was implemented to solve the partial differential 40 studied the effect of confining pressure on microannulus size Opedal et al 41 studied the sealability of neat Class G cement Stormont et al 13 extensively investigated the effect of confining and casing pressures on hydraulic aperture size Ahmed et al 18 investigated the ability of cement to act as a secondary barrier in case of failure of the seal assembly Al Ramadan et al 19 studied the sealability of neat cement and the effect of anti-gas migration additive to prevent gas leakage Corina et al 12 evaluated cement sealability at varying temperatures when using anti-gas migration additives Kwatia et al 3 evaluated the sealability of different cement recipes that can prevent gas migration Corina et al 42 studied the effect of pipe roughness on the sealing ability of cement plugs Kremieniewski et al 43 formulated new cement slurries that can prevent gas migration in gas wells 16 and Tao et al 46 modified the aforementioned model to obtain the effective system permeability Rocha-Valadez et al 15 analytical solution for an SCP numerical model Aas et al 17 analytical leakage model through microannulus Ford et al 47 leakage calculator based on analytical models Stormont et al 13 Fluid flow in porous media is usually described through Darcy's law which is written as…”

Section: Methodsmentioning

confidence: 99%

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

et al. 2021

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Cement sheath is considered an important barrier throughout the life cycle of the well. The integrity of the cement sheath plays a vital role in maintaining the integrity of wells. Cement’s ability to seal the annular space or a wellbore, also known as cement sealability, is an important characteristic of the cement to maintain the well integrity. It is believed that placing cement in the annular space or wellbore can totally prevent any leakage; however, that is debatable. The reason why cement cannot completely prevent fluid leakage is that cement is considered as a porous medium, and also flaws in cement, such as microannuli, channels, and fractures, can develop within the cement sheath. Furthermore, the complexity of casing/cement and cement/formation interaction makes it very difficult to fully model the fluid migration. Hence, fluid can migrate between formations or to the surface. This article presents a numerical model for gas flow in cement sheath, including the microannulus flow. A parametric study of different variables and their effect on the leakage time is carried out, such as the microannulus gap size, cement matrix permeability, cement column length, and cement porosity. In addition, it presents leakage scenarios for different casing/liner overlap length with the existence of microannulus. The leakage scenarios revealed that the cement matrix permeability, microannulus gap size, and cement length can highly impact the leakage time; however, cement porosity has a minimal effect on the leakage time. In addition, modeling results revealed that the casing/liner overlap length should not be less than 300 ft, and the casing pressure duration should be beyond 30 min to detect any leak.

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Section: Methodsmentioning

confidence: 99%

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

et al. 2021

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“…The finite element method (FEM) is one of the most popular numerical techniques applied to engineering problems [14]. Numerous FEM simulations on the packer setting have been reported [15][16][17][18][19][20]. Alzebdeh et al [15] conducted a FEM simulation to investigate the effects of the seal length and thickness, the compression ratio, and boundary conditions on the contact pressure for an expandable elastomer.…”

Section: Introductionmentioning

confidence: 99%

“…In their conclusion, the Ogden model was better to characterize the mechanical behavior of the investigated rubber. By setting up a three-dimension FEM model, Ahmed et al [18] indicated that the most critical factor affecting the performance of an elastomer seal is the annular fit, followed by the Poisson's ratio and elastic modulus of the rubber, and the compression ratio. Their model is linearly elastic and validated by the analytical formula from Al-Hiddabi and his co-workers' results [11].…”

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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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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“…A cement sheath can act as a secondary barrier element in a dual barrier (elastomer seal and cement sheath) zonal isolation system. Cement is the main physical barrier able to seal fluid flow into unintended zones from the wellbore [10] and [11]; the rubber materials can be squeezed into the annulus between the hanger and the upper casing, effectively sealing the annulus, and providing an efficient twoway pressure-bearing capacity [12] to [14].…”

Section: Introductionmentioning

confidence: 99%

Investigation on the Depth of Slip Hanger Teeth Bite into Casing and the Mechanical Properties of Casing under Different Suspension Loads in Ultra-Deep Wells

Chen¹,

Tan²,

Xiao³

2021

SV-JME

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There is great difficulty in controlling the setting load of the large-size slip casing hanger in the Northwest Oilfield in China, and a reasonable setting load is of great significance. This paper studied the relationship between slip hanger bite depth and suspension load in the Ф 273 mm WE-type slip hanger in the Northwest Oilfield in China through experiment, theoretical computation, and finite element analysis. The accuracy of the finite element model was proved by comparing the finite element simulation results with the experimental bite marks on the casing surface. The study results show that the bite mark of the slip insert in the casing is deeper in the lower part of the sitting position. When the hanging load increases from 1000 kN to 6000 kN, the maximum bite depth of the slips in the casing gradually increases with the suspension load. The residual collapse strength of the casing decreases correspondingly. When the residual collapse strength decreases to a certain value, the maximum suspension force corresponding to the bite depth of the slip insert can be obtained. Based on the finite element research results and theoretical equations, the stress distribution on the casing wall where the slips bite the deepest is obtained by derivation. The suggestions on improving the material structure of the casing under this stress were proposed. The limit of the setting load of the large-size casing wellhead for avoiding casing collapse was obtained, which is of great significance for guiding field-casing setting.

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Evaluation of liner hanger seal assembly and cement sheath as a dual barrier system: Implications for industry standards

Cited by 17 publications

References 13 publications

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

Numerical Modeling of Gas Migration through Cement Sheath and Microannulus

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

Investigation on the Depth of Slip Hanger Teeth Bite into Casing and the Mechanical Properties of Casing under Different Suspension Loads in Ultra-Deep Wells

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