Numerical simulation on gas production from hydrate reservoir at the 1st offshore test site in the eastern Nankai Trough

被引:115
作者
Sun, Jiaxin [1 ]
Ning, Fulong [1 ]
Zhang, Ling [1 ]
Liu, Tianle [1 ]
Peng, Li [1 ]
Liu, Zhichao [1 ]
Li, Chenglong [1 ]
Jiang, Guosheng [1 ]
机构
[1] China Univ Geosci, Fac Engn, Wuhan 430074, Peoples R China
基金
中国国家自然科学基金;
关键词
Gas hydrate; Nankai Trough; Depressurization; Numerical simulation; Completion interval; STRATIGRAPHIC TEST WELL; DISSOCIATION; FLOW;
D O I
10.1016/j.jngse.2016.01.036
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
According to the available geological data of hydrate reservoir at the 1st offshore production site in the Eastern Nankai Trough in 2013, a simulation model matching the production test scheme was established to investigate a relatively long-term production performance and the effect of perforated interval on gas production by comparing the short simulation results and the field test data (6 days). The verification results indicate that the simulated gas production rate is consistent with the measured field value but a certain deviation of corresponding water production rates occurs. The relatively long-term simulation performed reveal that both gas released rate in the sediment and gas production rate in the well increase before complete dissociation of hydrates between bottom hole and underburden. After that, they convert to decreasing and the water production rate increases sharply. Meanwhile, the slight secondary hydrates are observed in the dissociation front. Additionally, the sensitivity analysis of completion interval indicates that the perforated interval design for candidate hydrate reservoir like this site should avoid the low-permeability hydrate layer and take the lower hydrate layers as the water blocking zones when using depressurization method, and that the optimum completion interval should be determined by together considering the production period and the expected production rate. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码:64 / 76
页数:13
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