Investigation of the impact of threshold pressure gradient on gas production from hydrate deposits

被引:18
|
作者
Lu, Cheng [1 ,2 ,3 ,4 ]
Qin, Xuwen [2 ,5 ]
Ma, Chao [1 ,2 ]
Yu, Lu [1 ,2 ]
Geng, Lantao [1 ,2 ]
Bian, Hang [2 ,4 ]
Zhang, Keni [6 ]
Zhou, Yingfang [7 ]
机构
[1] China Geol Survey, Guangzhou Marine Geol Survey, Guangzhou 511458, Peoples R China
[2] Southern Marine Sci & Engn Guangdong Lab Guangzho, Guangzhou 511458, Peoples R China
[3] China Geol Survey, Ctr Oil & Nat Gas Resource Explorat, Beijing 100083, Peoples R China
[4] China Univ Geosci, Sch Energy Resources, Beijing 100083, Peoples R China
[5] China Geol Survey, Beijing 100083, Peoples R China
[6] Lawrence Berkeley Natl Lab, Energy Geosci Div, Berkeley, CA USA
[7] Univ Aberdeen, Sch Engn, Aberdeen AB24 3UE, Scotland
基金
中国国家自然科学基金;
关键词
Natural gas hydrate; Threshold pressure gradient; Argillaceous siltstones; Numerical simulation; METHANE HYDRATE; BEARING SEDIMENTS; CHINA;
D O I
10.1016/j.fuel.2022.123569
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
Many hydrate-bearing sediments are featured with unconsolidated argillaceous siltstones, which exist the non Newtonian flow and threshold pressure gradient due to the high content of clay. In this study, the threshold pressure gradient of hydrate reservoir in the South China Sea is experimentally clarified. The quantitative relationship between it and the reservoir parameters is established. The function of threshold pressure gradient has been added into TOUGH + HYDRATE simulator. Here, site SH2, a candidate for field testing comprising a clayey silt gas hydrate reservoir in the Shenhu area of the South China Sea, was chosen to investigate the effect of threshold pressure gradient on gas production behavior through numerical simulations. The simulation results show that threshold pressure gradient has a significant impact on gas extraction. When the experimental value was applied, the gas production was enhanced unexpectedly, where cumulative gas output doubled in 5 years. The active hydrate dissociating area (gas, water and hydrate coexist) has notably extended, accompanying with the expanding cool zone. Water blockage near well was relieved. However, with the increasing of threshold pressure gradient, propagation of pressure would be restrained seriously. The pressure and hydrate of far-field formations stay "frozen ". The bottom water invasion was weakened.
引用
收藏
页数:16
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