Thermal Performance Hybrid Optimization of Natural Gas Hydrate Wellbore

Ning Wang; Hui Wang; Victor Kuzin; Binhui Zheng; Taohong Xu

doi:10.57118/creosar/978-1-915740-01-4_10

Authors

Ning Wang
Hui Wang
Victor Kuzin
Binhui Zheng
Taohong Xu

DOI:

https://doi.org/10.57118/creosar/978-1-915740-01-4_10

Keywords:

Hybrid analysis, subsea wellbore, finite difference method, enthalpy method, natural gas hydrate, insulation material

Abstract

Studies show that there are massive gas hydrate reservoirs in offshore deepwater seabed. The main challenge of exploiting these resources is THE high-cost transportation of the extracted gas to the onshore facilities. Moreover, adjusting the temperature near the wellbore is another challenge to prevent regeneration of gas hydrate during extraction. Therefore, the hybrid analysis of the finite difference method and the enthalpy method is used to get a synergistic effect in order to realize the effective thermal property output. To analyze the transient heat transfer process, a 2D model is developed to simulate the wellbore area. Moreover, different materials are used for insulation and the corresponding thermal performances are calculated using the enthalpy method. The obtained results show that the soil surrounding the wellbore performs as an insulator. Adding an insulation layer outside the wellbore can effectively enhance the exit temperature. Moreover, the model indicates that the fluid holding time can be dramatically extended using the microphase change materials (MPCM) as an insulation layer.

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