Evaluation of Premium Threaded Connections Using Finite-Element Analysis and Full-Scale Testing

Hilbert, L.B.; Kalil, Issa

doi:10.2118/23904-ms

Cited by 19 publications

(5 citation statements)

References 12 publications

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“…Although the theoretical method is convenient for usage, the stringent assumptions of the elastic material and contact pressure make its application limited. The third method is the finite element method (FEM), which is an effective way to deal with material nonlinearity, contact nonlinearity and complex load conditions for premium connections and has been taken as the most popular and necessary tool for new product development [10][11][12][13]. Chen et al investigated the sealing mechanism of tubing and casing premium threaded connections under complex loads [14].…”

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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“…Hilbert and Kalil (Hilbert 1992) described how nonlinear FEA techniques can be used for threaded connection performance evaluation. Day (1989) described that thread flank contact pressure is the key analysis parameter for 8-round thread performance for worst-case geometry and assembly conditions, to establish the minimum axial engagement necessary to seal the internal yield pressure (reduced by a design factor) of each size, weight, and grade.…”

Section: Challenges and Opportunities Leading To Development Of A Makmentioning

confidence: 99%

Continuing Application of Torque-Position Assembly Technology for API Connections

Powers

Chelf

2010

SPE Annual Technical Conference and Exhibition

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API threaded casing and tubing connections are expected to maintain structural integrity and sealability performance throughout the life of the well. Current industry standards specify thread dimensions and tolerances, but the critical makeup operation is specified with either torque-only or standoff (position) control. Variation among individual pin/coupling geometry combinations makes either of these makeup control processes inadequate to assure the expected structural and sealability performance of the connection. One operator developed and for the last 20 years has been using a quality control process for makeup that combines torque monitoring and a measurement of final assembly position. This assembly method, called Torque-Position, has provided gas-tight strings for critical well applications worldwide.Torque-Position assembly parameters were developed for tubing external upset (EUE), casing long thread (LTC), casing short thread (STC), and buttress (BTC) connections using advanced nonlinear finite element analysis and physical testing. Procedures were developed for easily implementing the assembly parameters for coupling buck-on in the mill and for final makeup at the rig floor. These procedures include painting a narrow circumferential band on the pin end behind the threads and watching for the face of the coupling to fall within the band at the end of the assembly operation to validate the position. Simultaneously, makeup torque is measured with an electronic load cell.The operator will continue to use Torque-Position assembly parameters and implementation procedures and hopes that publication will lead to wider application of the technology. This paper will describe lessons learned over the past 20 years to ensure successful application of Torque-Position makeup technology.

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“…Hamilton et al also adopted ultrasonic techniques to examine accurately the seal surface contact stress in premium connections [10]. Taken as an effective way to deal with the material nonlinearity, contact nonlinearity, and complex load conditions for premium connection, FEM has been the most popular and necessary tool for new product development of premium connection [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

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

Yang

2020

Mathematical Problems in Engineering

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The present research studies about sealability of premium connection almost focus on qualitative description by sealing contact stress distribution, which is not convenient for sealing capacity evaluation and sealing parameter design. This paper proposes a quantitative model to calculate directly gas sealing capacity of cone to cone premium connection, different from the usual finite element method with testing, which combines the elastic thick wall cylinder interference fit theory for calculating sealing stress with the gas sealing criterion obtained from Murtagian’s experimental results. With the proposed model, the effects of pipe wall thickness, seal cone taper, radial sealing interference, and axial sealing length on the gas sealing capacity have been investigated. Furthermore, the gas sealing capacity envelope curve based on radial sealing interference and axial sealing length is also calculated and a new sealing parameter design method is proposed for cone to cone premium connection. The results show that the internal upset pipe is good for sealability, and increasing both radial sealing interference and axial sealing length can significantly enhance gas sealability while seal cone taper has an unobvious effect on it. To meet sealing capacity, the designed sealing parameter combination (δd, Ld) should be located in the upper right region of the gas sealing capacity envelope curve.

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Evaluation of Premium Threaded Connections Using Finite-Element Analysis and Full-Scale Testing

Cited by 19 publications

References 12 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

Continuing Application of Torque-Position Assembly Technology for API Connections

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

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