Numerical simulation of gas production from natural gas hydrate deposits with multi-branch wells: Influence of reservoir properties

被引：54
作者：
Zhang, Panpan [1 ]
Zhang, Yiqun [1 ]
Zhang, Wenhong [1 ]
Tian, Shouceng [1 ,2 ,3 ]
机构：
[1] China Univ Petr, State Key Lab Petr Resources & Prospecting, Beijing 102249, Peoples R China
[2] China Univ Petr Beijing Karamay, Karamay 834000, Peoples R China
[3] Harvard SEAS CUPB Joint Lab Petr Sci, 29 Oxford St, Cambridge, MA 02138 USA
来源：
ENERGY | 2022年 / 238卷
基金：
中国国家自然科学基金;
关键词：
Natural gas hydrate; Multi-branch well; Permeability anisotropy; Initial hydrate saturation; Production simulation; STRATIGRAPHIC TEST WELL; METHANE HYDRATE; NANKAI TROUGH; BEARING SEDIMENTS; HORIZONTAL WELL; CLASS-I; DEPRESSURIZATION; RECOVERY; STIMULATION; ENHANCEMENT;
D O I：
10.1016/j.energy.2021.121738
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
Vast amounts of natural gas hydrate are buried in subseafloor sediments without impermeable boundaries, which is recognized as an essential energy source for the future. Previously, the multi-branch well was proposed to enhance the recovery efficiency of natural gas hydrate, and the gas production rate has been dramatically improved comparing with the vertical well. However, the multi-branch well shows a terrible performance in gas production duration. As a continuation of the previous study, numerical simulations were conducted to investigate the influence of hydrate reservoir properties on the gas production potential. Results indicate that it is hard to extract hydrate commercially for hydrate accumulations without impermeable boundaries. A high initial hydrate saturation leads to a long gas production duration but a low gas production rate. An increase in the intrinsic permeability of isotropic reservoirs would shorten the gas production duration and result in a low gas recovery ratio. Permeability anisotropy shows a noticeable effect on enhancing the gas recovery ratio and the gas production duration due to the improved pressure propagation pattern. Therefore, in the upcoming field tests, reservoir reconstructions that enhance permeability anisotropy are strongly suggested to obtain better outcomes. (c) 2021 Elsevier Ltd. All rights reserved.
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页数：13
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