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OS3C-3：DEVELOPMENT OF A COMPREHENSIVE MODEL FOR TRANSIENT HYDRATE FORMATION IN PIPELINES: OVERVIEW AND APPLICATIONS
发布时间:2014-07-28
Luis E. ZERPA1, Zachary M. AMAN2, Ishan RAO3, Sanjeev JOSHI3, E. Dendy SLOAN3, Carolyn A. KOH1, Amadeu K. SUM1
1. Petroleum Engineering Department, Colorado School of Mines, USA; 2. Centre for Energy, School of Mechanical & Chemical Engineering, The University of Western Australia, Australia; 3. Center for Hydrate Research, Chemical & Biological Engineering Department, Colorado School of Mines, USA
The formation of natural gas hydrates in deep subsea pipelines is one of the most challenging flow assurance problems. The development of a comprehensive hydrate model, which predicts temporal and spatial hydrate formation and plugging in flowlines of oil-, water- and gas-dominated systems, will have significant utility in flow assurance. This empowers the engineer to design and assess oil/gas transport facilities, with a focus on prevention, management or remediation of gas hydrate formation and blockages. In the current work, we present improvements to the hydrate aggregation module used for oil-dominated systems, based on experimental data, which account for temperature, particle-particle contact time, excess water, and the presence of surface active compounds. Second, we have extended the hydrate prediction model to water- and gas-dominated systems, and have developed fundamental models based on flowloop and laboratory data. In water-dominated systems, we present a mass transfer-based growth model and hydrate-plugging criterion, based on fluid velocity. In gas-dominated systems, we present a combined heat and mass transfer model for hydrate film growth on pipe walls. These models are applied to a typical well/flowline/riser geometry used in offshore facilities. This model improves our capability to predict hydrate formation and blockages, by considering dynamic aggregation phenomena in oil-dominated systems, flow regime transition in high water cut systems, and hydrate film growth in gas saturated systems. This contribution will overview the different models and provides examples of their application in the predictions of hydrate formation in multiphase flow conditions.
1. Petroleum Engineering Department, Colorado School of Mines, USA; 2. Centre for Energy, School of Mechanical & Chemical Engineering, The University of Western Australia, Australia; 3. Center for Hydrate Research, Chemical & Biological Engineering Department, Colorado School of Mines, USA
The formation of natural gas hydrates in deep subsea pipelines is one of the most challenging flow assurance problems. The development of a comprehensive hydrate model, which predicts temporal and spatial hydrate formation and plugging in flowlines of oil-, water- and gas-dominated systems, will have significant utility in flow assurance. This empowers the engineer to design and assess oil/gas transport facilities, with a focus on prevention, management or remediation of gas hydrate formation and blockages. In the current work, we present improvements to the hydrate aggregation module used for oil-dominated systems, based on experimental data, which account for temperature, particle-particle contact time, excess water, and the presence of surface active compounds. Second, we have extended the hydrate prediction model to water- and gas-dominated systems, and have developed fundamental models based on flowloop and laboratory data. In water-dominated systems, we present a mass transfer-based growth model and hydrate-plugging criterion, based on fluid velocity. In gas-dominated systems, we present a combined heat and mass transfer model for hydrate film growth on pipe walls. These models are applied to a typical well/flowline/riser geometry used in offshore facilities. This model improves our capability to predict hydrate formation and blockages, by considering dynamic aggregation phenomena in oil-dominated systems, flow regime transition in high water cut systems, and hydrate film growth in gas saturated systems. This contribution will overview the different models and provides examples of their application in the predictions of hydrate formation in multiphase flow conditions.
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