A Quantitative Model to Calculate Gas Sealing Capacity and Design Sealing Parameters for Premium Connection

Xu, Huan-Yan; Yang, Bin

doi:10.1155/2020/9074381

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…The second category is the theoretical method, which is on the basis of macroscopic or microscopic contact mechanics. The former gets the sealing contact pressure distribution first and then uses average sealing contact pressure or a sealing index integrated by sealing width and sealing pressure to evaluate the sealability [8], while the latter can calculate the gas leakage rate of a premium connection directly [9]. Although the theoretical method is convenient for usage, the stringent assumptions of the elastic material and contact pressure make its application limited.…”

Section: Et Al Presented Adoptingmentioning

confidence: 99%

Effects of Make-Up Torque on the Sealability of Sphere-Type Premium Connection for Tubing and Casing Strings

Yang

Xiang

et al. 2023

Processes

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The present investigations on sealability evaluation for tubing and casing premium connections depend on the FEM with testing. This paper proposed a theoretical model to evaluate the sealability of a sphere-type premium connection based on make-up torque, which combines Hertz contact pressure and the von Mises yield criterion for calculating elastic–plastic contact pressure distribution on sealing interface and adopts the gas sealing criterion obtained from Murtagian’s experimental results for deducing gas sealing capacity. With the proposed model, the effects of additional make-up torque from the sealing interface on the sealing contact pressure distribution and key sealability parameters, including contact width, yield width, average contact pressure and gas sealing capacity, were analyzed and compared. The results show that additional make-up torque from the sealing interface closely influenced sealability parameters’ variation and gas sealing capacity. The gas sealing index based on the sealing contact energy theory should be recommended for sealability evaluation other than average contact pressure on the sealing interface. For improving gas sealability, make-up torque should be controlled accurately for ensuring enough average contact pressure and contact width but a proper yield width, and a lager sphere radius should be selected for reducing the risk of yield sticking.

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Section: Et Al Presented Adoptingmentioning

confidence: 99%

Effects of Make-Up Torque on the Sealability of Sphere-Type Premium Connection for Tubing and Casing Strings

Yang

Xiang

et al. 2023

Processes

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“…Abaqus/Standard Solver is used to analyze finite element models. The interaction attribute is set using the Coulomb friction model to set the contact attribute, the tangential behavior friction formula uses a penalty function, and the normal behavior is set to hard contact [10,32]. Set the Box (rigid body) with higher hardness as the main contact surface and set the Pin (elastic body) as the secondary contact surface.…”

Section: Verification Of Dynamic Modelmentioning

confidence: 99%

“…Nasraoui et al [9] constructed a simplified numerical model of bolt bonding surfaces and established a contact stiffness matrix. Xu et al [10] established contact pressure distribution and sealing surfaces length of premium connection under different buckling torques by analytical method and further evaluated the sealing condition of the connection by a comprehensive consideration of various factors. Zhiqian et al [11] analyzed the sealing performance of the connection by combining the elastic-plastic mechanical contact theory and calculated geometric morphology parameters of the rough surfaces.…”

Section: Introductionmentioning

confidence: 99%

“…At present, there are fewer reports about the sealing property of premium connections under dynamic load. Yang et al [10] established a contact stress model of sealing surfaces and analyzed the energy dissipation law under different sealing conicities. Yu et al [27] established a shear layer microslip model of the sealing surfaces at an early stage and analyzed the influence of the shear layer coefficient on the microslip state and energy dissipation of the sealing surfaces.…”

Section: Introductionmentioning

confidence: 99%

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Finite-Element Analysis on Energy Dissipation and Sealability of Premium Connections under Dynamic Loads

Cao

et al. 2023

Processes

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In the process of high flow rate fracture and high gas production, the sealing performance of the premium connection decreases due to the dynamic load and vibration of downhole tubing strings, which may cause accidents. Existing static analysis methods cannot effectively explain this phenomenon. The main objective of this paper is to propose a novel analytical method for evaluating the sealing performance of a premium connection. In this paper, a dynamic model of sealing surfaces of the premium connection is established based on the vibration equation of elastic rod, and the hysteresis characteristics and energy dissipation mechanism of sealing surfaces are analyzed. Considering the influence of spherical radius, internal pressure, axial cyclic load amplitude, and modal vibration, a spherical-conical premium connection finite element model is established to analyze the influence laws of the connection’s energy dissipation and sealing performance. The results show that the sealing performance of the premium connection under dynamic load can be effectively analyzed by using energy dissipation theory compared with traditional static contact analysis. Compared with the vibration of the tubing string, the dynamic loads caused by the change of fluid pressure and flow rate in the tubing string have a significant influence on the connection’s sealing performance. When the internal pressure and axial cyclic loads are 80 MPa, 400 kN, or 60 MPa and 500 kN respectively, serious plastic deformation occurs in the thread and sealing surfaces, and the energy dissipation of the sealing surfaces increases significantly, which could lead to sealing failure.

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“…The complex oil and gas wells such as high-temperature and high-pressure deep wells and long-distance horizontal well need the high performance of casing connections [1]. There are many kinds of premium connections from different factories with higher performance to contrast with the API connection [2][3], which mainly include high pressure gas sealability, high tension and compression resistance. High compression performance is particularly important for its implementation is more difficult.…”

Section: Concept Of Connection Compression Performancementioning

confidence: 99%

Integrity Analysis of Casing Premium Connection under High Compression Load

Wang

Xie

Zheng³

et al. 2021

MSF

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With the increasingly harsh conditions of complex oil and gas wells such as high-temperature and high-pressure deep wells and long-distance horizontal well, the integrity of casing string puts forward higher requirements for compression performance of premium thread connections. The requirements of high compression resistance of connection is complicated, including ensuring the integrity of structure and sealability for thread at the same time under high compression load being equal to the bearing capacity of casing body, and considering the structural fatigue, environmental fracture and seal failure caused by the weakening of thread bearing performance under cyclic load. Based on the failure cases of some casing connections, laboratory tests and finite element analysis results, this paper discusses the key technical points in the above mentioned problems, and provides the suggestions for the performance optimization of high-performance casing premium connections based on failure prevention.

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A Quantitative Model to Calculate Gas Sealing Capacity and Design Sealing Parameters for Premium Connection

Cited by 3 publications

References 10 publications

Effects of Make-Up Torque on the Sealability of Sphere-Type Premium Connection for Tubing and Casing Strings

Effects of Make-Up Torque on the Sealability of Sphere-Type Premium Connection for Tubing and Casing Strings

Finite-Element Analysis on Energy Dissipation and Sealability of Premium Connections under Dynamic Loads

Integrity Analysis of Casing Premium Connection under High Compression Load

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