Determination of operating load limits for rotary shouldered connections with three-dimensional finite element analysis

Chen, Feng; Di, Qinfeng; Li, Ning; Wang, Chunsheng; Wang, Wenchang; Wang, Mingjie

doi:10.1016/j.petrol.2015.04.029

Cited by 22 publications

(12 citation statements)

References 15 publications

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“…The determination of the flow factor φ(h) is carried out as follows. Under a given gap height, the flow rate between smooth plates is calculated with Equation (7), and the flow rate between rough surfaces is obtained with CFD simulation (Ansys Fluent). The leakage channels obtained by the contact simulation between rough surfaces (Figure 9) were imported to the Fluent software (2023R1).…”

Section: Leakage Rate Calculation Modelmentioning

confidence: 99%

“…Recently, 3D finite element simulations have become more and more widely used in assessing the performance of oil casing connections. A large number of works have been devoted to studying the evolution of contact stress during make-up and thermo-mechanical loading [7][8][9][10][11]. Nevertheless, except for our previous effort [3], there are no other works addressing the identification of optimum make-up torque.…”

Section: Introductionmentioning

confidence: 99%

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Modeling Surface Roughness and Flow of Gases in Threaded Connections to Analyze Sealing Performance

Zhu,

Liang,

Zhao

2024

Processes

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Oil casings and premium threaded connections play vital roles in the oil and gas extraction industry. The present work establishes an integrated modeling framework for the sealability assessment of premium threaded connections which can be easily implemented and employed by engineers. The framework incorporates a part-scale finite element analysis of the make-up process, a micro-scale simulation of the contact behavior, and a mechanism-informed gap flow model. It is found that complete sealing can be achieved when the contact pressure exceeds 1540 MPa for Gaussian rough surfaces presenting a roughness of 1.6 μm. The seal surface fit is revealed to be critical for sealing performance, as it slightly changes the optimum make-up torque (up to 4%) but significantly changes contact pressure (up to 22%). At an optimum make-up torque, the connection with the loosest seal surface tolerance fit is prone to gas leakage when considering an inlet pressure of 110 MPa. The proposed modeling framework can be extended to other types of threaded connections with metal–metal contact sealing.

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Section: Leakage Rate Calculation Modelmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling Surface Roughness and Flow of Gases in Threaded Connections to Analyze Sealing Performance

Zhu,

Liang,

Zhao

2024

Processes

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“…Detailed information about the modeling techniques can be found in Ref. [20]. The total numbers of nodes and elements are 6.045 million and 4.955 million, respectively.…”

Section: Microchannels Between the Seal Surfaces Of Casing Connectionmentioning

confidence: 99%

“…It is worth mentioning that the results obtained by 2D FEA are incapable of accurately reflecting the contact state of the seal surfaces since the helix angle of thread has been ignored. Few studies have successfully implemented 3D FEA of threaded connections in ANSYS and ABAQUS [20][21][22][23][24]. The necessity of applying 3D FEA instead of 2D FEA has been demonstrated in these studies.…”

Section: Introductionmentioning

confidence: 99%

Flow in Microchannels between Sealing Surfaces of Casing Connections: LBM Simulation

Chen

Wang

et al. 2023

Geofluids

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Great difficulties have been encountered in the study of the seal failure of casing connection. The in situ microscopic seal surfaces under complex loads are hard to be obtained due to the engagement characteristics of thread. In this study, a method to construct the microscopic seal surfaces of a specified 7 ″ casing PTC under complex loads was proposed. Then, the lattice Boltzmann method (LBM) was applied to simulate the fluid flow inside the microchannel between the seal surfaces. The effect of pressure gradient and wettability on the flow behavior of a multicomponent fluid system at the microscopic scale was analyzed. Pressure gradient has a huge influence on the volume fraction of sealing compound and the average velocity of displacing fluid. The volume fraction of sealing compound decreases with the increase of pressure gradient. Break-through can be observed for fluid systems with relatively larger pressure gradient. For the systems with Δ p = 0.658 , Δ p = 0.439 , and Δ p = 0.219 , the break-through time steps are around 61000, 99000, and 295000, respectively. Wettability has huge impact on the distribution of sealing compound, and break-through was not observed for the fixed pressure difference Δ p = 0.110 with various wettability. It is expected to provide some new insights for understanding the seal failure of casing connections at the microscopic level.

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“…Among them, finite element method has been widely used. Ishimura et al, 12 Hilbert and Bergstrom, 13 DeLange et al, 14 Chen et al, 15 and Chen et al 16 have done successful studies on sealing performance of joints by finite element method.…”

Section: Introductionmentioning

confidence: 99%

An establishing method for worn tubing joint model and the influence of wear on stress distribution of joint sealing surface

Zhou

Chen

et al. 2023

Advances in Mechanical Engineering

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Wear has serious influence on the strength and tightness of tubing joint. In this paper, a new joint wear establishment method, “numerical cutting method,” was proposed and the stress distribution characteristics of sealing surface were analyzed. The three-dimensional modeling of a worn tubing joint under complex loads was successfully established and the finite element method was used to calculate the stress distribution on sealing surface. The influence of internal wear on the stress distribution of the sealing surface was analyzed and the failure mechanism of a worn tubing joint was revealed. The results showed that the contact stress of the worn part of the sealing surface decreases with increased wear depth of internal wear. When the internal wear depth reaches 3.0 mm, the maximum contact stress in the worn area decreases by 35.5% than that of the unworn joint along the axial direction and by 27.3% along the circumferential direction of sealing surface. While when the external wear reaches 3.0 mm, the stress distribution of the sealing surface is similar to that of the unworn joint. These mean that more attention should be paid to the prevention of internal wear during operation because an internal wear has more effect on the stress characteristics of the sealing surface than external wear. The sealing belt is located in the middle of the sealing surface, and the width of the sealing belt at different wear depths is roughly the same for two wear forms. This is beneficial to ensure the seal integrity of tubing joint.

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Determination of operating load limits for rotary shouldered connections with three-dimensional finite element analysis

Cited by 22 publications

References 15 publications

Modeling Surface Roughness and Flow of Gases in Threaded Connections to Analyze Sealing Performance

Modeling Surface Roughness and Flow of Gases in Threaded Connections to Analyze Sealing Performance

Flow in Microchannels between Sealing Surfaces of Casing Connections: LBM Simulation

An establishing method for worn tubing joint model and the influence of wear on stress distribution of joint sealing surface

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