Investigation on leakage cause of 13Cr pipe flange used for a Christmas tree in a high-pressure and high-temperature gas well

Long, Yan; Luo, Jingxi; Yue, Ming; Wu, Gang; Zhao, Man; Ji, Nan; Song, Wenwen; Jin, Qiang; Kuang, Xianren; Fan, Yujie

doi:10.1016/j.engfailanal.2022.106793

Cited by 8 publications

(2 citation statements)

References 20 publications

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“…The results showed that the flanges had experienced severe crevice corrosion in the gasket area. The corrosion was shown to be caused by microorganisms by EDS analysis.Yan Long [10] analyzed the cause of leakage of 13Cr pipe flanges for Christmas trees in high pressure and high temperature gas wells, and the results showed that the leakage failures were related to cracks in the annular grooves. The cracks start from the edge of the corrosion pit and extend along the delta ferrite/martensite interface, and the carbide-rich matrix reduces the corrosion resistance while the delta ferrite deteriorates the cracking resistance, which is the main factor leading to the failure.…”

Section: Introductionmentioning

confidence: 99%

Failure analysis of wellhead to desander flange

Qian,

Gao,

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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A wellhead to desander flange failed. In this paper, the causes of flange failure were systematically analyzed by chemical composition analysis, hardness test, scanning electron microscopy and energy spectrum analysis, XRD corrosion composition analysis and macroscopic morphology analysis. The results show that the hardness of the flange meets the standard requirements; the chemical composition meets the standard requirements; the main elements in the corrosion pit are C, O, Fe and a small amount of S elements. XRD experimental results show that the corrosion products in the corrosion pits are mainly FeCO 3 , no iron sulfide is found, and it can be judged that the CO 2 in the transport medium is the main cause of flange corrosion. The presence of a large amount of CO 2 in the transport medium was detected, thus providing further evidence of CO 2 corrosion. There is no H 2 S in the conveying medium, and the S element detected in the corrosion pit may be that the S element in the flange gradually precipitates to the surface of the corrosion pit during the corrosion process of the flange; Based on the macroscopic characteristics of the corrosion pits and the corrosion products, it can be inferred that the flanges were not tightly fitted with the wound gaskets during the installation process and that gaps existed, which led to the accumulation of moist CO 2 gas there and caused the corrosion of the flanges. The results of the study have a positive effect on eliminating similar defects as well as eliminating safety hazards.

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Section: Introductionmentioning

confidence: 99%

Failure analysis of wellhead to desander flange

Qian,

Gao,

et al. 2024

Ninth International Conference on Energy Materials and Electrical Engineering (ICEMEE 2023)

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“…New techniques and challenges arising from new materials and manufacturing processes are continuously pushing Non-Destructive Testing (NDT) forward [ 1 , 2 ]. One good example concerns in-service high-temperature component inspection, whose industrial relevancy is easily sustained [ 3 ]. Components such as steam transportation pipelines must withstand high temperatures above 300 °C, requiring adapted in-service inspection and condition monitoring methods.…”

Section: Introductionmentioning

confidence: 99%

Non-Destructive Inspection of High Temperature Piping Combining Ultrasound and Eddy Current Testing

Santos

Machado

Monteiro³

et al. 2023

Sensors

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This paper presents an automated Non-Destructive Testing (NDT) system for the in-service inspection of orbital welds on tubular components operating at temperatures as high as 200 °C. The combination of two different NDT methods and respective inspection systems is here proposed to cover the detection of all potential defective weld conditions. The proposed NDT system combines ultrasounds and Eddy current techniques with dedicated approaches for dealing with high temperature conditions. Phased array ultrasound was employed, searching for volumetric defects within the weld bead volume while Eddy currents were used to look for surface and sub-surface cracks. The results from the phased array ultrasound results showed the effectiveness of the cooling mechanisms and that temperature effects on sound attenuation can be easily compensated for up to 200 °C. The Eddy current results showed almost no influence when temperatures were raised up to 300 °C.

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Collapse failure analysis of S13Cr-110 tubing in a high-pressure and high-temperature gas well

Zhao²,

Wu³

et al. 2023

Engineering Failure Analysis

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Investigation on leakage cause of 13Cr pipe flange used for a Christmas tree in a high-pressure and high-temperature gas well

Cited by 8 publications

References 20 publications

Failure analysis of wellhead to desander flange

Failure analysis of wellhead to desander flange

Non-Destructive Inspection of High Temperature Piping Combining Ultrasound and Eddy Current Testing

Collapse failure analysis of S13Cr-110 tubing in a high-pressure and high-temperature gas well

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