Study on sealing capacity of packing element in compression packer

Hu, Gang; Wang, Guorong; Li, Ming; He, Xiang; Wu, Wenjun

doi:10.1007/s40430-018-1364-5

Cited by 16 publications

(9 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Therefore, the theoretical maximum contact stress is more conservative than the FEM and experimental solutions, which can effectively predict the change trend of maximum contact stress and provide a lower limit reference value for the contact stress of the packer in the actual seal process. On the premise of allowable contact stress, so long as the theoretical solution meets the sealing requirements, 11 the seal reliability of the actual CPRT structure can be guaranteed.…”

Section: Comparison Of Contact Stress Under Different Axial Loadsmentioning

confidence: 99%

“…€ Ongu¨n et al 9 proposed a theory for calculating the Coulomb friction-fluid Reynolds pressure penetration of the rubber ring as a highly deformed dynamic seal, which was closely related to the interaction between the deformed seal structures. Dorokhov et al 10 and Hu et al 11 built an experimental bench, constitutive and friction tests of rubber materials were carried out, and the pressure penetration mechanism was verified. The results showed that the compression deformation and endurable pressure difference increase with the increase of axial loads.…”

Section: Introductionmentioning

confidence: 99%

“…10 and Hu et al. 11 built an experimental bench, constitutive and friction tests of rubber materials were carried out, and the pressure penetration mechanism was verified. The results showed that the compression deformation and endurable pressure difference increase with the increase of axial loads.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

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:

View full text Add to dashboard Cite

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.

show abstract

Section: Comparison Of Contact Stress Under Different Axial Loadsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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:

View full text Add to dashboard Cite

show abstract

“…As mentioned above, in the second step of the local model, the pressure penetration criterion in the FE software is applied to the contact surface, and its principle is shown in Fig. 7 [24,25]. The contact face with elements 3 and 4 is defined as the master surface, and the other surface with elements 1 and 2 is defined as the slave surface.…”

Section: Pressure Penetration Criterionmentioning

confidence: 99%

Unbonded Flexible Pipe Under Internal Pressure

2017

Advances in Pipes and Pipelines

View full text Add to dashboard Cite

The sealing performance of end fittings is very important for offshore oil and gas pipelines. To investigate the sealing behavior of a ring-shaped wedge seal, global and local numerical models of the ringpipe interaction have been developed based on the finite-element method. First, the sealing process of the ring under pressure is simulated. Second, a criterion for the penetration of fluid pressure is applied in these models to assess how the sealing capacity changes along the contact surface. Finally, the contact magnitude of interference and the shape of the sawtooth heaves on the sealing ring are predicted and compared. The results show an interesting concentration of von Mises stress in the sealing ring and also that the peak contact pressure appears in the sealing zone. However, the penetration of fluid pressure has obvious effects on the distributions of von Mises stress and contact pressure. The best sealing performance is when the axial displacement of the sealing ring is 1.4 mm and the contact magnitude of interference is 0.3 mm. Given the sawtooth heave of sealing ring, semicircular heave gives the better sealing capacity compared with trapezoidal heave.

show abstract

“…Their results indicated that the packer presented a nonlinear almost elastic mechanical behavior from the second load cycle onwards. For numerical simulation, Hu et al (2017Hu et al ( , 2018, Patel et al (2019a, b) studied the influence of three rubber materials on sealing performance of packing element in the compression packer. Wang et al (2017), Lan et al (2019) studied the structure of the packer rubber with different materials and optimized the structure of its sealing unit.…”

Section: Introductionmentioning

confidence: 99%

Multi-objective optimization and experiment of nylon cord rubber in expandable packer

et al. 2021

View full text Add to dashboard Cite

Nylon cord rubber has the advantages of small residual deformation and is easy to lift and lower the tubing string in low-permeability oil and gas reservoirs. However, it is associated with low-pressure resistance and poor sealing performance. To enhance the performance of nylon cord rubber, a three-dimensional numerical model of the nylon cord rubber was established and its accuracy experimentally determined. The Plackett–Burman test, the Steepest climbing test and the Response surface method were used to acquire the polynomial response surface model connecting structural parameters with bearing and sealing pressure. Using genetic algorithms, optimal structural parameters of nylon cord rubber were determined depending on field operation. The reliability of the optimized results was verified by laboratory tests. It was shown that after optimization, the bearing capacity of the expandable packer increased by 25% while the sealing performance increased by 66%. In addition, the bearing pressure was 70 MPa while the sealing pressure was 50 MPa. These measurements effectively met the on-site requirements of high-pressure and fine fracturing in low-permeability oil and gas reservoirs.

show abstract

Study on sealing capacity of packing element in compression packer

Cited by 16 publications

References 9 publications

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

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

Unbonded Flexible Pipe Under Internal Pressure

Multi-objective optimization and experiment of nylon cord rubber in expandable packer

Contact Info

Product

Resources

About