首页|Optimization of Gas Production from Hydrate-Bearing Sediments with Fluctuation Characteristics

Optimization of Gas Production from Hydrate-Bearing Sediments with Fluctuation Characteristics

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As an important source of low-carbon,cleanfossil energy,natural gas hydrate plays an important role in improving the global energy consumption structure.Developing the hydrate industry in the South China Sea is important to achieving'carbon peak and carbon neutrality'goals as soon as possible.Deep-water areas subjected to the action of long-term stress and tectonic movement have developed complex and volatile terrains,and as such,the morphologies of hydrate-bearing sediments(HBSs)fluctuate corre-spondingly.The key to numerically simulating HBS morphologies is the establishment of the conceptual model,which represents the objective and real description of the actual geological body.However,current numerical simulation models have characterized HBSs into horizontal strata without considering the fluctuation characteristics.Simply representing the HBS as a horizontal element re-duces simulation accuracy.Therefore,the commonly used horizontal HBS model and a model considering the HBS's fluctuation characteristics with the data of the SH2 site in the Shenhu Sea area were first constructed in this paper.Then,their production behav-iors were compared,and the huge impact of the fluctuation characteristics on HBS production was determined.On this basis,the key parameters affecting the depressurization production of the fluctuating HBSs were studied and optimized.The research results show that the fluctuation characteristics have an obvious influence on the hydrate production of HBSs by affecting their temperatures and pressure distributions,as well as the transmission of the pressure drop and methane gas discharge.Furthermore,the results show that the gas productivity of fluctuating HBSs was about 5％less than that of horizontal HBSs.By optimizing the depressurization ampli-tude,well length,and layout location of vertical wells,the productivity of fluctuating HBSs increased by about 56.6％.

natural gas hydratenumerical simulationfluctuation characteristicsdepressurization productionproduction well optimization

LI Yaobin、XU Tianfu、XIN Xin、YU Han、YUAN Yilong、ZHU Huixing

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Key Laboratory of Groundwater Resources and Environment,Ministry of Education,Jilin University,Changchun 130021,China

Jilin Provincial Key Laboratory of Water Resources and Environment,Jilin University,Changchun 130021,China

National Natural science Foundation of ChinaNational Natural science Foundation of ChinaJilin Scientific and Technological Development ProgramInternational Cooperation Key Laboratory of Underground Energy Development and Geological RestorationGraduate Innovation Fund of Jilin University

422762244220623020190303083SFYDZJ202102CXJD0142023CX100

2024

10.1007/s11802-024-5633-x

中国海洋大学学报(自然科学英文版)
中国海洋大学

中国海洋大学学报(自然科学英文版)

CSTPCD
影响因子：0.268
ISSN：1672-5182
年,卷(期)：2024.23(3)
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