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Experimental evaluation of the gas recovery factor of methane hydrate in sandy sediment

机译：含沙沉积物中甲烷水合物气采收率的实验评价

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Gas production tests have been conducted on artificial sandy sediments saturated by methane hydrate and water using a unique apparatus referred to as High-pressure Giant Unit for Methane-hydrate Analyses (HiGUMA), which is the world's largest reservoir simulating vessel intended for gas hydrate analysis. The gas recovery factor was investigated at various depressurization schemes, including one-step depressurization, multistep depressurization, and depressurization below the quadruple point of methane hydrate. The gas production rate increased during the depressurization process with sediment temperature reduction; however, the rate decrease and stabilized at a very low level after the temperature reached a newly established equilibrium condition. This result indicates that an appropriate heat of the hydrate-bearing sediments is a crucial factor for driving hydrate dissociation. The potential economic recovery factor was 14% for 4.6 MPa of production pressure in the one-step depressurization. In the multistep depressurization, the recovery factor was increased with a reduction in production pressure and showed values of 13%, 31%, and 40% for 4.0 MPa, 3.1 MPa, and 2.5 MPa, respectively. However, depressurization above the quadruple point could not dissociate all the existing hydrate due to the lack of heat. In contrast, it was determined that 65% of the in-place methane could be produced when the production pressure was decreased to 2.1 MPa, which is below the quadruple point, because the latent heat of ice formation was efficiently used for hydrate dissociation. The results show that intentional ice formation by adjusting production pressure can potentially enhance methane hydrate recovery at a comparable level of conventional natural gas production.
机译：已使用称为甲烷水合物分析的高压巨型装置（HiGUMA）的独特装置，对甲烷水合物和水饱和的人造砂状沉积物进行了天然气生产测试，这是世界上最大的用于天然气水合物分析的储层模拟容器。在各种降压方案下研究了气体回收率，包括单步降压，多步降压和甲烷水合物四点以下的降压。在降压过程中，随着沉积物温度的降低，产气率增加。然而，在温度达到新建立的平衡条件后，速率降低并稳定在非常低的水平。该结果表明，含水合物沉积物的适当热量是驱动水合物解离的关键因素。在一步减压中，对于4.6 MPa的生产压力，潜在的经济恢复因子为14％。在多级减压中，随着生产压力的降低，采收率提高，并且对于4.0 MPa，3.1 MPa和2.5 MPa的采收率分别为13％，31％和40％。然而，由于缺乏热量，在四点以上的降压不能解离所有现有的水合物。相反，确定的是，当生产压力降低到2.1 MPa（低于四倍点）时，可以生产65％的原位甲烷，因为有效地利用了结冰的潜热来分解水合物。结果表明，通过调节生产压力来有意形成冰块可以以与常规天然气生产相当的水平提高甲烷水合物的回收率。

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