Finite Element Analysis of the Packer at Fracturing

Li, Zhi Miao; Liu, Ju Bao; Ding, Yu Qi

doi:10.4028/www.scientific.net/amm.385-386.159

Cited by 5 publications

(4 citation statements)

References 2 publications

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“…The maximum working pressure difference and temperature of the packer are mainly limited by the material of the rubber barrel, and the choice of material is a key factor in the design of the packer tube (Luo et al, 2002;Bu et al, 2011;Li et al, 2013;Dorokhov et al, 2016). The main rubber materials of compression packers are fluorine rubber, nitrile rubber, and hydrogenated nitrile rubber.…”

Section: Selection Of Cartridge Materialsmentioning

confidence: 99%

Adaptability of hydraulic fracturing packers and optimization of their sealing performance for three common clastic rock reservoirs based on finite element analysis

et al. 2022

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In this paper, the adaptability characteristics of the packer to three types of common clastic rock reservoirs (mudstone, shale, sandstone) are analyzed systematically. Moreover, the identification and structural design of the packer in hydraulic fracturing are systematically conducted based on the finite element calculation. Finally, the nonlinear mathematical models of the packing safety factor and the pressure under the packer and the conditions of casing, mudstone, shale and sandstone are obtained. The results show that the maximum stress of the rubber cylinder in the three formation models of mudstone, shale and sandstone is lower than the compression set strength of the rubber cylinder, indicating that the rubber cylinder will not cause stress damage. At the same time, by analyzing the common rubber materials and constitutive models of the packers, the structure of the packer rubber cylinder and a new anti-shoulder protrusion device were redesigned. The Nitrile-butadiene rubber (NBR) meets the performance requirements of the rubber tube under the allowable pressure difference and temperature difference. The designed new anti-protrusion device can ensure the structural integrity and stress uniformity of the rubber tube, thereby ensuring good sealing performance. Under the three formation conditions of mudstone, shale and sandstone, the rubber cartridge can be in a safe working state, and its sealing width is close to the contact length of the rubber cartridge. In addition, the rubber cartridge is in a good elastic deformation range. The design of the packer in this study satisfies the third strength theory and the safety requirements. The deformation and sealing performance of the rubber cylinder are relatively stable, and the size of the rubber cylinder also meets the field requirements.

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Section: Selection Of Cartridge Materialsmentioning

confidence: 99%

Adaptability of hydraulic fracturing packers and optimization of their sealing performance for three common clastic rock reservoirs based on finite element analysis

et al. 2022

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“…In accordance with the process of the incremental analysis of large deformation problems and by the penalty function technique, Jia Shan-po [6] considered the contact pressure between rubber tube and casing increased nonlinearly with the setting load. With finite element analysis, Li Zhi-miao [7] considered the soft rubber tube had the effect of start-up setting and the hard rubber tube had sealing effect. To sum up, the methods of numerical simulation and finite element analysis are mostly used to research rubber tube sealing and the elastic modulus of rubber tube and the friction coefficient between rubber tube and the casing aren't considered.…”

Section: Introductionmentioning

confidence: 99%

“…Wang Zun-ce [3] selected the rubber tube of Y341-114 water injection packer as the research object, and considered the friction force between rubber tube and casing had a linear relationship with the axial compression force under [4][5][6][7][8][9][10][11][12][13][14][15][16][17] MPa pressure. Yin Fei [4] simulated the contact pressure distribution of rubber tube by ANSYS and figured out the formula between maximum contact pressure of rubber tube and the setting liquid pressure.…”

Section: Introductionmentioning

confidence: 99%

The effect of elastic modulus and friction coefficient on rubber tube sealing performance

Ren

et al. 2015

SPIE Proceedings

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The packer is the key element in separating geosphere layers of water injection, water plugging and fracturing operations in the oilfield. The sealing ability of the packer is depending on the contact pressure between rubber tube and the casing.The circumferential strain of casing wall was tested by the strain gauge to get the contact pressure distribution along axial direction of the tube. The friction force between the casing and the rubber tube was taken by the pressure sensor in compression process. Under the 20,60 and 100 degrees Celsius conditions, the friction forces and the contact pressure distribution were taken in work condition of single rubber tube, double rubber tubes and combination rubber tubes after oil immersion .The result shows that elastic modulus of rubber tube has little effect on the friction force and contact pressure. With elastic modulus decreasing, the friction forces has gradually decreasing trend; The friction coefficient has much impact on friction force: the friction forces under the condition of dry friction and wet friction are respectively equivalent to 48.27% and 5.38% axial compression forces. At wet friction condition, the contact pressure distribution is more uniform and the sealing effect is better.

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“…They are often used in drilling, water injection, water blocking and stratified oil production. 1 When it reaches the working position, packer rubber is axial compressed by setting pressure, comes into contact with the pipe wall or the open-hole wall to form a sealing annulus and divide the well. As the core-sealing component of the packer, the sealing performance of the rubber directly affects the sealing ability of the packer and oil and gas exploitation profits.…”

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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Finite Element Analysis of the Packer at Fracturing

Cited by 5 publications

References 2 publications

Adaptability of hydraulic fracturing packers and optimization of their sealing performance for three common clastic rock reservoirs based on finite element analysis

Adaptability of hydraulic fracturing packers and optimization of their sealing performance for three common clastic rock reservoirs based on finite element analysis

The effect of elastic modulus and friction coefficient on rubber tube sealing performance

Evaluation of sealing performance of a compression packer at high temperature

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