A comparison of hydrate formation conditions determination methods

Date

2024-12-06

Author

Azazi, Taylan

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Gas hydrates represent a significant potential in global natural gas reserves; however, they cause major operational challenges, particularly during subsea deep-well drilling, well testing, and natural gas pipeline transmission. Hydrate blockages in wells and pipelines require substantial interventions, resulting in significant financial losses. To address these issues, numerous studies have been conducted, various theoretical formulas developed, and different software programs introduced. In this study, quick hydrate estimation methods and programs widely used in industry and academia such as CSMHYD and MultiFlash were compared with experimental data obtained using different ambient conditions and gas compositions. The primary goal of the study is to accurately determine error margins, contribute to the literature, and provide solid data to guide future research. The study is divided into four main sections. The first section investigates the hydrate formation conditions of pure gases (C1-C4) and impurities like CO2, N2, and H2S, showing that increasing molecular weight and the presence of impurities lead to higher error margins. The second section explores gases with the same gas gravity, revealing that correlations derived from gas gravity yield similar results for different gases, while the K-Factor method provides more consistent and reliable results. The third section examines the hydrate formation conditions of mixtures containing impurities, finding that an increase in nitrogen increases error margins, while an increase in CO2 reduces error margins. No distinct trend was observed for hydrogen sulfide. The final section analyzes gas mixtures likely to be encountered in the industry, using 12 different methods to assess the most reliable and applicable methods. The results show that thermodynamic-based methods, such as CSMHYD and MultiFlash, yield lower error margins, while the Kidnay-Parrish method also provides effective results and is considered one of the most applicable quick hydrate estimation methods. The main finding of the study is that each method can provide more accurate results under specific temperature and pressure conditions for different gas compositions.

Subject Keywords

Gas hydrate, Hydrate formation conditions, Quick hydrate estimation methods, CSMHYD, Multiflash

URI

https://hdl.handle.net/11511/112908

Collections

Graduate School of Natural and Applied Sciences, Thesis