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  • Open Access

    ARTICLE

    Impact of Permeability Heterogeneity on Methane Hydrate Production Behavior during Depressurization with Controlled Sand Production

    Junyu Deng1,2, Rui Zhang1,*, Xudong Zhao3, Hongzhi Xu1,2, Peng Ji1, Zizhen Zhang1, Yifan Yang1

    Energy Engineering, Vol.122, No.10, pp. 4153-4168, 2025, DOI:10.32604/ee.2025.065906 - 30 September 2025

    Abstract Field tests have demonstrated that depressurization with controlled sand production is an effective technique for natural gas hydrate extraction. Variations in depositional environments and processes result in significant heterogeneity within subsea natural gas hydrate-bearing sediments. However, the influence of permeability heterogeneity on production performance during depressurization with controlled sand production remains inadequately understood. In this study, a multiphase, multi-component mathematical model is developed to simulate depressurization with controlled sand production in methane hydrate-bearing sediments, incorporating geological conditions representative of unconsolidated argillaceous siltstone hydrate deposits in the Shenhu area of the South China Sea. The effects… More >

  • Open Access

    ARTICLE

    An Experimental Study on the Interaction between Hydrate Formation and Wax Precipitation in Waxy Oil-in-Water Emulsions

    Xincan Song1,3,4, Lin Wang1,3,4,*, Cheng Yu1,2, Jiaxin Chen1,3,4, Linjie Ma1,3,4

    Energy Engineering, Vol.120, No.8, pp. 1837-1852, 2023, DOI:10.32604/ee.2023.027637 - 05 June 2023

    Abstract The coupled formation of wax crystals and hydrates is a critical issue for the safety of deep-sea oil and gas exploration and subsea transport pipeline flow. Therefore, this paper conducts an experimental study on the characteristics of methane hydrate formation in a water-in-oil (W/O) system with different wax crystal contents and explores the influence of different initial experimental pressures on the induction period and maximum rate of hydrate formation. The wavelet function was introduced to process the reaction rate and calculate the maximum speed of hydrate formation. Notably, the higher the pressure, the smaller the… More >

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