Numerical modeling and experimental study of elastomer seal assembly in downhole wellbore equipment: Effect of material and chemical swelling

Ahmed, Shawgi; Patel, Harshkumar; Salehi, Saeed

doi:10.1016/j.polymertesting.2020.106608

Cited by 18 publications

(3 citation statements)

References 22 publications

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“…A pressure-holding controller was designed according to the Moho square cover principle. However, dynamic seal rings play an important role in underground equipment [16]. As influenced by high temperatures and high pressure in underground environments (the temperature generally reaches over fifty centigrade while pressure generally ranges from ten more MPa to dozens of MPa), dynamic seal rings in underground equipment are affected by both the thermal domain and structural domain.…”

Section: Introductionmentioning

confidence: 99%

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Wang

et al. 2023

Lubricants

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The leakage prediction calculation method for dynamic seal rings in underground equipment is presented in this paper. The framework of the method is given. The leakage prediction model is built. The non-Newtonian fluid interface element is brought in. The leakage prediction calculation method was developed based on the thermal–structural coupled method and the fluid–structural coupled method. A test is performed to validate the proposed method. It is proved that the film thickness of an O-ring made of nitrile rubber in pulling-in travel is thicker than that in pushing-out travel. The leakage of an O-ring made of fluororubber is larger than that of an O-ring made of nitrile rubber in the same environmental condition. The presented method is useful for predicting the sealing ability of dynamic seal rings in underground equipment. Evaluation costs will be reduced with the given leakage prediction calculation method.

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Section: Introductionmentioning

confidence: 99%

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Wang

et al. 2023

Lubricants

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“…Hu 17 experimentally optimised the constitutive model of rubber materials and proposed evaluating the sealing performance of rubber with the maximum von Mises stress. Hu 18 and Ahmed 19 compared the visual experimental device results with the simulation results and obtained the relationship between the compressive deformation of rubber and the sealing performance.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of sealing performance of a compression packer at high temperature

Zheng

Fei

2022

Science Progress

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Rubber is the key component of a compression packer, which directly affects the success or failure of seals. Presently, the contact stress between the rubber and borehole walls is used as the main evaluation criterion for the sealing ability of the rubber of the compression packer. However, this evaluation criterion is imperfect. This study establishes the sealing performance and reliability evaluation system of a compression packer at 120°C. Considering the influence of time and temperature on the mechanical characteristics of rubber materials, the international advanced test technology was used to complete the uniaxial, planar and biaxial tensile tests and stress relaxation test for hydrogenated nitrile butadiene rubber (HNBR) of a compression packer under high temperature. Next, the hyperelastic and viscoelastic constitutive models of rubber materials based on high-temperature test data were established. Comprehensive sealing performance and reliability evaluation system for the compression packer rubber with compression rate, linear pressure, surface pressure and sealing performance coefficient were proposed. The evaluation system tested the rubber's stress relaxation effect on the rubber's sealing performance. The establishment of the evaluation system improved the shortcomings of the current packer-sealing performance evaluation system and provided a theoretical basis for the design and optimisation of the key structure of the packer-sealing system. Besides, based on the evaluation system, a platform for automatic structure simulation analysis and optimisation design of packer sealing system was developed and successfully applied to the actual design and optimisation process of packer. The system can effectively predict the sealing ability of the packer and guide field applications of the packer.

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“…In this context, seals or O-rings must resist and ensure tightness performance throughout their use, although they are prone to the so-called plasticization effect [1]. More significantly, the effect of absorbed CO 2 during a Rapid Gas Decompression (RGD) [2][3][4] can be catastrophic, and damages depend on parameters, i.e., the decompression speed, the kind of polymer, the squeeze (Parker definition: The squeeze is a ratio of the amount of deformation applied to the seal expressed as a percentage of the free-state crosssectional thickness), their cure, and the particle reinforcement... Hydrogenated Nitrile Butadiene Rubber (HNBR) and Fluorocarbon rubber (FKM by ASTM standard) are well known for their resistance to RGD and, more generally, to chemical aggression and thermal degradation [5][6][7]. Saturation conditions, especially in CO 2 , are known to alter the gas permeability due to plasticizing effects in almost all polymers, which is more pronounced for elastomer components [8][9][10][11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

Lainé

Grandidier

Boyer

et al. 2022

Matériaux & Techniques

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A better understanding of elastomers’ behavior during Rapid Gas Decompression (RGD) requires advanced knowledge of what is happening during gas sorption and desorption. This will offer to improve numerical simulation phenomena to consider a real environmental use of an O-ring, as for thermal applications. A previous experimental study developed testing protocols to investigate the performance of elastomeric O-rings. The non-contact measurement technique has been validated to identify the swelling and shrinking coefficients during sorption and desorption of carbon dioxide (CO2) from a Hydrogenated Nitrile Butadiene Rubber (HNBR) O-ring. The present work describes the effect of CO2 pressures on Fluorocarbon rubber (FKM) seals behavior coupled with temperature. To evaluate the effect of reinforcing the HNBR and FKM matrices with nanofillers, experimental tests were carried out and compared with those of the two elastomers without fillers. The four materials’ CO2 sorption and desorption coefficients are identified, and their swelling upon decompression is measured. It appears that HNBR is the best candidate under the applied service conditions. On the other hand, the nanofillers introduced in the elastomers may cause some early damages under RGD conditions.

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Numerical modeling and experimental study of elastomer seal assembly in downhole wellbore equipment: Effect of material and chemical swelling

Cited by 18 publications

References 22 publications

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Evaluation of sealing performance of a compression packer at high temperature

Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

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Numerical modeling and experimental study of elastomer seal assembly in downhole wellbore equipment: Effect of material and chemical swelling

Cited by 18 publications

References 22 publications

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Research on Leakage Prediction Calculation Method for Dynamic Seal Ring in Underground Equipment

Evaluation of sealing performance of a compression packer at high temperature

Identification of swelling/shrinking coefficients under CO2 on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices

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Product

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Identification of swelling/shrinking coefficients under CO₂ on an FKM O-ring – Comparison with HNBR and influence of reinforcements on the matrices