Research on Experimental Method for the Working Force between Packer Rubber and Casing Tube

Wang, Zun Ce; Lv, Feng; Cao, Meng; Wen, Hou; Xu, Yan

doi:10.4028/www.scientific.net/amm.518.138

Cited by 5 publications

(4 citation statements)

References 3 publications

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“…Liu et al 5 conducted the tensile test of the rubber tube in the environment of CO 2 formation fluid corrosion, obtained the mechanical properties of HNBR rubber tube before and after corrosion, and concluded that HNBR material has better stability than AFLAS material. Wang et al 6 proposed a new measurement method of friction and normal pressure for testing the force between rubber tube and casing. Zhu et al 7 compared and analyzed the changes of mechanical properties of three different rubber tube materials before and after CO 2 corrosion and came to the conclusion that the corrosion in liquid environment was more serious than that in gas environment.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis and optimization method research on sealing of deep shale gas ultra-high-pressure fracturing packer rubber

Dong

Liu

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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The contact pressure distribution computation model was established to evaluate the internal and external sealing performance of packer rubber. And the results show that the internal sealing performance of packer rubber may be lower than the external side. The weights of the key parameters which influence the internal and external sealing performance of the rubber tube are obtained by calculation. The optimized structural parameters are obtained by genetic algorithm, and the sealing performance is increased by 21%. The research work is significant to improve the packer’s sealing performance and adapt deep shale gas wells ultra-high pressure fracturing conditions.

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Section: Introductionmentioning

confidence: 99%

Failure analysis and optimization method research on sealing of deep shale gas ultra-high-pressure fracturing packer rubber

Dong

Liu

2022

Proceedings of the Institution of Mechanical Engineers, Part C:

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“…The results showed that the compression deformation and endurable pressure difference increase with the increase of axial loads. Wang et al 12 carried out casing strain test with CPRT bearing using BDISTS-WIFI test system and laboratory software, different friction and normal pressure were obtained and matched with the empirical formula.…”

Section: Introductionmentioning

confidence: 99%

“…Wang et al. 12 carried out casing strain test with CPRT bearing using BDISTS-WIFI test system and laboratory software, different friction and normal pressure were obtained and matched with the empirical formula.…”

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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“…In order to solve the technical problems of deep wells and complex formations, James et al (2013) improved the temperature resistance and the pressure resistance of the permanent production packer from 69 MPa and 121 °C to 138 MPa and 132 °C after many years of studies. Zhang et al (2011) and Wang et al (2014) experimentally investigated the working force between the packer rubber and the casing tube and the stress-strain curves of packer rubber material at different temperatures, which provide the basis for establishing constitutive relations of packer rubbers.…”

Section: Introductionmentioning

confidence: 99%

Sealing properties and structure optimization of packer rubber under high pressure and high temperature

et al. 2019

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During hydraulic fracturing operations of low-permeability reservoirs, packers are the key component to ensure the success of multistage fracturing. Packers enable sections of the wellbore to be sealed off and separately fractured by hydraulic pressure, one at a time, while the remainder of the wellbore is not affected. However, reliable sealing properties of the packer rubber are required to meet the high-pressure and high-temperature (HPHT) conditions of reservoirs (such as 70 MPa and 170 °C). In this study, the structures of the packer rubber with two different materials are optimized numerically by ABAQUS and validated by experiments. The optimization process starts from the packer rubber with a conventional structure, and then, the weakest spots are identified by ABAQUS and improved by slightly varying its structure. This process is iterative, and the final optimized structure of a single rubber barrel with expanding backup rings is achieved. For the structure of three rubber barrels with metallic protective covers, both HNBR and AFLAS fail under HPHT conditions. For the final optimized structure, the packer rubber made of AFLAS can work better under HPHT than that made of HNBR which ruptures after setting. The results show that the optimized structure of a single rubber barrel with expanding backup rings and the material AFLAS are a good combination for the packer rubber playing an excellent sealing performance in multistage fracturing in horizontal wells.

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Research on Experimental Method for the Working Force between Packer Rubber and Casing Tube

Cited by 5 publications

References 3 publications

Failure analysis and optimization method research on sealing of deep shale gas ultra-high-pressure fracturing packer rubber

Failure analysis and optimization method research on sealing of deep shale gas ultra-high-pressure fracturing packer rubber

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

Sealing properties and structure optimization of packer rubber under high pressure and high temperature

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