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首页> 外文期刊>Marine and Petroleum Geology >Development, test, and evaluation of exploitation technologies for the application of gas production from natural gas hydrate reservoirs and their potential application in the Danube Delta, Black Sea
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Development, test, and evaluation of exploitation technologies for the application of gas production from natural gas hydrate reservoirs and their potential application in the Danube Delta, Black Sea

机译：从天然气水合物储层应用气体生产的开发技术的开发，测试和评估及其在多瑙河三角洲，黑海中的潜在应用

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摘要

One important scientific objective of the national research project SUGAR - Submarine Gas Hydrate Reservoirs was the development, improvement, and test of innovative concepts for the production of methane from natural gas hydrate reservoirs. Therefore, different production methods, such as the thermal stimulation using in situ combustion, the chemical stimulation via injection of CO2 as a gaseous, liquid or supercritical phase and depressurization were tested alone or in combination at different scales. In the laboratory experiments these ranged from pore and hydrate grain scale to 425-L reactor volume, whereas numerical models were applied to describe the related processes from molecular to reservoir scale. In addition, the numerical simulations also evaluated the feasibility and efficiency of the application of these methods in selected areas, such as the Danube Paleodelta in the Black Sea, addressing the two dominant methane hydrate reservoir settings, buried channel-levee and turbidite systems. It turned out, that the injection of CO2 or a CO2-N-2 gas mixture is not applicable for the Danube Paleodelta in the Black Sea, because the local pressure and temperature conditions are too close to the equilibrium conditions of both, the CO2 hydrate and a CO2-N-2 mixed hydrate stability fields. Experiments using thermal stimulation and depressurization showed promising results but also some issues, such as sufficient heat transfer. In summary it can be said that the applicability and efficiency of each method has to be proven for each specific hydrate reservoir conditions. Based on the results obtained by numerical simulations the most promising and safe method for the production of CH4 from hydrate bearing sediments in the Danube Paleodelta would be the depressurization technique. This study summarizes the main experimental and modeling results.
机译：国家研究项目糖 - 潜艇天然气水合物储层的一个重要科学目标是从天然气水合物储层生产甲烷的创新概念的开发，改进和测试。因此，不同的生产方法，例如使用原位燃烧的热刺激，通过注射CO 2作为气态，液体或超临界相和减压的化学刺激，或者在不同的尺度上组合测试。在这些从孔隙和水合物粒度范围为425-L反应体积的实验室实验中，施加数值模型来描述来自分子到储层规模的相关过程。此外，数值模拟还评估了这些方法在选定区域中应用这些方法的可行性和效率，例如黑海中的多瑙河古司达拉，解决两个主要的甲烷水合物储层设置，埋地通道 - 堤坝和浊度系统。结果证明，二氧化碳或CO2-N-2气体混合物的注射不适用于黑海中的多瑙河古二虫菌，因为局部压力和温度条件太靠近两者的平衡条件，CO2水合物和CO2-N-2混合水合物稳定性场。使用热刺激和减压的实验表明了有希望的结果，但也存在一些问题，例如足够的传热。总之，可以说必须为每个特定水合物储层条件证明每种方法的适用性和效率。基于通过数值模拟获得的结果，最有希望和安全的CH4从多瑙河古德拉水合物沉积物中生产CH4将是减压技术。本研究总结了主要的实验和建模结果。

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