Numerical Simulation of Secondary Hydrate Formation Characteristics and Effectiveness of Prevention Methods

被引:0
作者
Li, Xian [1 ,2 ]
Lu, Hongfeng [1 ,2 ]
Zhang, Panpan [3 ]
Yu, Lu [1 ,2 ]
Xiao, Changwen [1 ,2 ]
Li, Yan [4 ]
机构
[1] China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 511458, Peoples R China
[2] Natl Engn Res Ctr Gas Hydrate Explorat & Dev, Guangzhou 511458, Peoples R China
[3] China Univ Petr Beijing Karamay, Inst Petr Engn, Karamay 834000, Peoples R China
[4] Tsinghua Univ, Inst Ocean Engn, Tsinghua Shenzhen Int Grad Sch, Shenzhen 518055, Peoples R China
关键词
natural gas hydrate; throttling expansion; secondary hydrate formation; numerical simulation; GAS HYDRATE; METHANE HYDRATE; THERMAL-STIMULATION; SHENHU AREA; DEPRESSURIZATION; RESERVOIRS; EVOLUTION; CORE; SEA;
D O I
10.3390/en17205045
中图分类号
TE [石油、天然气工业]; TK [能源与动力工程];
学科分类号
0807 ; 0820 ;
摘要
The exploitation of natural gas hydrates by the pressure reduction method is affected by the decomposition heat absorption effect, and the range of the formation temperature reduction area is expanding. At the same time, the temperature reduction phenomenon is more significant around the production wells under the influence of gas throttling and expansion effects, and hydrate formation will occur under certain temperature and pressure conditions, leading to blockage of effective seepage channels in the reservoir in the region and elevation of seepage resistance, which may affect the output of hydrate decomposition gas. A numerical simulation model is constructed for the purpose of studying the secondary hydrate generation pattern around the well, analyzing the impact of secondary hydrates around wells on the production capacity, and assessing the effectiveness of prevention methods to inform the actual production of hydrates. The results demonstrate that secondary hydrate is typically formed in the near-well area of the upper part of the production well, and the secondary hydrate around the upper part of the production well is the first to be formed, exhibiting the highest saturation peak and the latest decomposition. The formation of the secondary hydrate can be predicted based on the observed change in temperature and pressure, and the rate of secondary hydrate formation is markedly rapid, whereas the decomposition rate, approximately 0.285 mole/d, is relatively slow. Additionally, the impact of secondary hydrates on cumulative gas production is insignificant, and the effect of secondary hydrates on capacity can be ignored. Hot water injection, wellbore heating, and reservoir reconstruction can effectively eliminate secondary hydrates around the well. Reservoir reconstruction represents a superior approach to the elimination of secondary hydrates, which can effectively enhance production capacity while preventing the generation of secondary hydrates.
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页数:18
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