Abstract
At some special conditions, it exists a huge challenge about flow assurance at the choke for the high-pressure and low-temperature. Analyzing and judging the subcooling degree of hydrate risk and its existence time at choke is of great significance for hydrate management. In this study, the hydrate risk at the choke was analyzed during the low production process, and restart process, and then the subcooling degree of hydrate risk and its existence time was calculated. The results show that in the early stage of low production with high pressure of reservoir when gas production is lower than 6 × 104 Sm3/d, it always exists hydrate risk at the upstream and downstream of the choke, and its subcooling degree is 3.79 ℃ and 18.45 ℃, respectively; with gas production increasing, the subcooling degree at of choke gradually decreases; when gas production is higher than 8 × 104 Sm3/d, there is no risk of hydrate formation at upstream of the choke; While when the gas production is higher than 18 × 104 Sm3/d, there is no risk of hydrate formation at upstream and downstream. When the gas well is restarted at the rate of production Δ(50 × 104 Sm3/d)/60 min, the maximum subcooling degree at downstream of the choke is 33.25 ℃, and the hydrate risk duration is 102 min.
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Acknowledgments
Financial supports from the Dongfang 1-1 gas field underwater production system engineering project (2019GXB01-08) is greatly acknowledged.
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Zeng, S., Li, W., Chen, W., Ju, P., Zhang, Z., Zhang, P. (2023). Hydrate Risk Analysis at Choke of Subsea Wellhead During Deep-Water Gas Development. In: Cao, W., Hu, C., Chen, X. (eds) Proceedings of the 3rd International Symposium on New Energy and Electrical Technology. ISNEET 2022. Lecture Notes in Electrical Engineering, vol 1017. Springer, Singapore. https://doi.org/10.1007/978-981-99-0553-9_41
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DOI: https://doi.org/10.1007/978-981-99-0553-9_41
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