Design and study of gas-tight premium threads for tubing and casing

Cui, Feilun; Li, Weijun; Wang, Guozheng; Gu, Zhengqi; Wang, Zanshe

doi:10.1016/j.petrol.2015.06.007

Cited by 14 publications

(7 citation statements)

References 10 publications

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“…Specimens with thread compound show less regularity compared with the result in figure5, and the leakage rate also far more than the set leakage threshold (0.06ml/s). The test results with thread compound proved the viewpoint of Francesc Pérez-Ràfols[4] that the simulation of the metal seal must be on the basis of the simplification of the metal surface topography.…”

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confidence: 72%

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Small-scale Experimental Research on the Key Parameters Affecting Metal-to-metal Sealability

Ji,

Wang,

Xie

et al. 2023

J. Phys.: Conf. Ser.

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The harsh service environment of high pressure and high temperature (HPHT) gas well have posed great challenge to the seal integrity of the casing string thread connections. All the time, due to the complexity of metal-to-metal sealing mechanism, there is no uniform reliable sealability criterion in the Finite Element Analysis process of the casing premium thread, so a systematic research on the sealing mechanism of the casing premium thread metal-to-metal seals. In this paper, a series small-scale metal-to-metal seal tests considering different influence factors were conducted, the results showed that the average contact stress at the leakage threshold increases with gas pressure, thread compound and metal roughness has significant influence on the metal sealing property, tests with fine surface roughness (<0.05um) and without thread compound show the lowest critical average contact stress value. Based on the test results, the key parameters for calculating the sealability criterion model were calibrated, and the sealability criterion is recommended for use in high-pressure applications.

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mentioning

confidence: 72%

“…In order to enhance the sealability of the casing thread connection, different kinds of premium thread which have gas-tight function are developed on the basis of API thread [4][5][6]. The typical structure of the premium thread is shown in figure 1.…”

Section: Introductionmentioning

confidence: 99%

Small-scale Experimental Research on the Key Parameters Affecting Metal-to-metal Sealability

Ji,

Wang,

Xie

et al. 2023

J. Phys.: Conf. Ser.

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“…Ultrasonic testing technology in the oil premium connection tubing sealing testing proposed relatively late in time, the application of technology has just begun, research on the ultrasonic testing of oil tubing seals is relatively few. At present, the oil tubing premium connection metal-to-metal sealing and its ultrasonic testing technology mainly focuses on sealing mechanism, simulation, mechanical design and other aspects 6,7,8,9 , the oil pipe seal ultrasonic testing technology in the direction of the actual application of engineering research is less. In recent years, a small number of scholars have conducted research on the possible causes of sealing failure in premium connection.…”

Section: Related Workmentioning

confidence: 99%

Promptable model for premium connection sealing surface detection and segmentation

Yang,

Fan,

Tian

et al. 2024

Fifth International Conference on Computer Vision and Computational Intelligence (CVCI 2024)

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When applying the tubing ultrasonic testing technology to evaluate the contact condition of the metal-to-metal sealing surface of premium connection, it is necessary to judge the ultrasonic reflection amplitude image of the manual contact interface to observe whether there is sealing defect. At present, the images of phased array ultrasonic testing results usually require professionals to rely on technical knowledge to judge, the analysis has low efficiency and strong evaluation subjectivity. Therefore, there is an urgent need for an intelligent method to identify the location, range and type of sealing defects in ultrasonic images accurately and efficiently, so as assisting or replacing manual operations. Aiming at the problems of heavy reliance on data quality and inflexible segmentation effect during the process of identifying the sealing surface region using the original Mask R-CNN network, the approach described in this paper enhances the model by incorporating the Segment Anything Model(SAM) and employs prompts to guide the object detection model in generating masks that fulfill various criteria. Experiments show that the method adopted in this paper can not only correctly identify the sealing surface location, but also, compared with the original Mask R-CNN network model, it can output a segmentation mask that meets the demand according to the prompts of different segmentation criteria, and the obtained sealing surface region is closer to the theoretical segmentation region.

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“…Therefore, some scholars have attempted to study the sealing performance of gas-tight seals using the finite element method Cui et al (2015), Li et al (2016). The influence of internal pressure on the contact stress and stress in threaded connections is analyzed by Dou et al (2012), it is revealed that an increase in internal pressure leads to higher von Mises stress and contact stress in the threaded contact area.…”

Section: Figurementioning

confidence: 99%

Study on Sealing Performance of Airtight Buckle Under Complex Loads

Chen,

Yang,

Tao

et al. 2024

Int. J. Res. Granthaalayah

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The existing studies on sealing performance of airtight buckle of production strings in oil and gas extraction mainly focus on complex loads without bending moment. In this paper, a numerical model of an airtight buckle under the complicated load with bending moment is constructed. The precision of the model is verified by comparing with theoretical value for thick-walled cylinders. The impact of simple and complex loads on the contact stress of the sealing surfaces is discussed. It should be noted that the contact stress exhibits a combined effect of multiple factors, and the internal pressure plays a dominant role. However, the influence of bending moments on the contact stress of the sealing surface can “reverse” under specific load combinations. The reason for this phenomenon is that the sensitivity of the tension side and compression side to internal pressure is different under bending moment. The obtained results can guide the design and usage for airtight buckle of the production string.

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Design and study of gas-tight premium threads for tubing and casing

Cited by 14 publications

References 10 publications

Small-scale Experimental Research on the Key Parameters Affecting Metal-to-metal Sealability

Small-scale Experimental Research on the Key Parameters Affecting Metal-to-metal Sealability

Promptable model for premium connection sealing surface detection and segmentation

Study on Sealing Performance of Airtight Buckle Under Complex Loads

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