Nonlinear thermo-mechanical coupled analysis of high temperature effect on strength, contact stress and ultimate torque of tool joint

Cheng, Jinhua; Sun, Youhong; Yu, Yongping; Chen, Lihui; Ma, Xiaolong

doi:10.1016/j.ijpvp.2020.104221

Cited by 8 publications

(2 citation statements)

References 15 publications

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“…In the study [8], the NC35 tool joint with the double shoulder is considered the research object and studied by finite element method (FEM) using nonlinear thermomechanical coupled-mode but not using the accuracy parameters of thread. In [9], the generalized mechanics model of multi-point thread turning operations is presented. The model can be used for both turning planning but not for accurate prediction.…”

Section: Literature Reviewmentioning

confidence: 99%

Prediction of the Accuracy of the Tapered Thread Profile

Panchuk¹,

Onysko²,

Kotwica³

et al. 2021

JES

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The efficiency of drill string largely depends on the pipe-end connector’s accuracy named tapered thread tool joint. Most of those are made by using lathes. Turning tools were made with a profile identical to the thread profile, and all well-known world brands’ plants make the back rake angle of such a cutter with zero value. This is obviously due to the lack of a precise algorithm for calculating the cutter profile and ensuring the accuracy of the tapered thread profile. A virtual experiment was carried out of three-dimensional modeling of the process for shape creation. It showed that in the case of lathe machining of the thread of NC23 type, the deviation from the nominal half profile of the obtained thread is only 0.02°. This result prompted the decision to propose a new algorithm for predictive calculation of the half-angle of the cut profile based on the parameter associated with actual turning – the working height of the profile – h in contrast to previous scientific sources where this calculation was based on the parameter H – not truncated thread Height which is associated with the theoretical base of the accuracy of the thread. The result of the program application, created based on the algorithm proposed in the article, showed that the predicted accuracy of the obtained profile’s half-angle could be in a range from –0.03° to +0.10°, which is equivalent to 4–13 % of tolerance of this dimension.

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Section: Literature Reviewmentioning

confidence: 99%

Prediction of the Accuracy of the Tapered Thread Profile

Panchuk¹,

Onysko²,

Kotwica³

et al. 2021

JES

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“…Feng Chen analyzed the working load limit of drill pipe by the three-dimensional finite element method and proposed a new method to determine the torsional limit of threads under complex loads [6] [7]. Jinhua Chen considered the effect of temperature on the joints of drill pipe [8], and finite element analysis of the joints of drill pipe was carried out by using the thermal coupling model and implicit-explicit transformation method. Many of these scholars have analyzed the mechanical properties of drill pipe joints from the structural design and under various complex loading conditions [9][10] [11].…”

Section: Introductionmentioning

confidence: 99%

Analysis of the Influence of Thread Parameter Deviation on The Sealing Performance of Drill Pipe Joint Under Axial Load

Cheng,

Hou

2024

AJST

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To explore the influence of the limit deviation of the thread parameters of the drill pipe joint on its sealing performance, based on the API NC38 drill pipe joint, the existence of the limit deviations of the three thread parameters of taper, side angle, and pitch is analyzed. Based on this, a total of 12 finite element models of drill pipe joints including various limit deviations and free combinations of internal and external thread limit deviations are established, and the sealing performance of different structures under the action of make-up torque and axial load is analyzed. The results show that the pitch limit deviation has the most obvious influence on the sealing performance of the drill pipe joint, and the yield failure of the contact surface is easy to occur. The existence of taper limit deviation makes the sealing performance of the drill pipe joint significantly reduced when subjected to tensile load. When the change of the limit deviation of the side angle of the internal and external thread teeth is opposite, the plastic deformation occurs locally in the drill pipe joint, which affects the sealing effect. Therefore, it is necessary to control further the tolerance range of the thread parameters of the drill pipe joint to reduce the risk of sealing failure of the drill pipe joint.

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