Mr. Jian Gao Profile

Jian Gao

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Proceedings Article | 21 July 2024 Paper

Establishing and applying a remaining life prediction model for natural gas collection and transportation pipelines in the context of CO2/H2S/O2

Shuai Zhao, Jian Gao, Lingdi Fu, Yongliang Liu, Lili Xie, Mingfang Cui, Wendi Fu

Proceedings Volume 13219, 132193Y (2024) https://doi.org/10.1117/12.3036503

KEYWORDS: Corrosion, Transportation, Oxygen, Ions, Carbon dioxide, Carbon monoxide, Hydrogen, Chlorine, Inspection, Energy efficiency

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Corrosive gases like CO₂, H₂S, and O₂ are commonly present in natural gas collection and transmission pipelines, leading to significant corrosion issues within the infrastructure. While the addition of quantitative corrosion inhibitors has traditionally helped slow down pipeline corrosion, instances of pipe perforation still occur. Currently, existing corrosion rate prediction models do not account for the effectiveness of protective measures, making it challenging to accurately calculate the remaining life of pipelines. Consequently, a novel approach has been developed to estimate the remaining life of gathering pipelines in the presence of CO₂, H₂S, and O₂. The novel approach is rooted in a corrosion rate prediction model that incorporates factors such as chloride ion concentration, dissolved oxygen levels, pipeline routing, and the efficiency of corrosion inhibition in influencing the corrosion rate. This approach involves segmenting the natural gas gathering and transportation pipeline into multiple time nodes spanning from production to evaluation. By calculating the corrosion rate at each node and determining the accumulated wall thickness value of the pipeline, it becomes possible to assess the remaining life of the pipeline. In contrast to current technologies, the discrepancy between the wall thickness loss value predicted by this new method and actual internal inspections is less than 10%. This enhanced accuracy significantly improves the prediction of remaining pipeline life, offering a reliable basis for decision-making regarding pipeline inspection and maintenance schedules.

Proceedings Article | 6 February 2024 Paper

Failure analysis of wellhead to desander flange

Hao Qian, Jian Gao, Mo He, Dong Lin, Wenjie Cheng, Wenwang Ai, Yi Xie

Proceedings Volume 12979, 129793K (2024) https://doi.org/10.1117/12.3015135

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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 FeCO₃, no iron sulfide is found, and it can be judged that the CO₂ in the transport medium is the main cause of flange corrosion. The presence of a large amount of CO₂ in the transport medium was detected, thus providing further evidence of CO₂ corrosion. There is no H2S 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 CO₂ 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.

Proceedings Article | 9 March 2023 Paper

Failure analysis of a gas mine outfall pipeline in Sichuan

Pengcheng Li, Dong Lin, Jian Gao, Chang Liu, Mingnan Sun, Haochen Wu

Proceedings Volume 12600, 126001J (2023) https://doi.org/10.1117/12.2674003

KEYWORDS: Corrosion, Pipes, Failure analysis, Carbon monoxide, Statistical analysis, Iron, Mining, 3D modeling, Manganese, Magnesium

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A failure occurred during the service period of the gas mine outfall pipeline in Sichuan Province, and a perforation was realized in the pipe section at 9 o'clock and multiple corrosion pits at 12 o'clock. In order to find out the cause of the failure, a hardness test was performed on the pipe sample to determine the mechanical properties of the pipe, and a metallographic analysis was performed on the pipe to determine the pipe tissue properties. The tube sample was scanned by electron microscope and analyzed by energy spectrum, and it was found that the cause of perforation and multiple corrosion pits in the tube sample was due to the corrosion of CO₂.

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