Pore-scale numerical simulation of mud erosion in the subsea sand–mud alternate layer using lattice Boltzmann method
Pore-scale numerical simulation of mud erosion in the subsea sand–mud alternate layer using lattice Boltzmann method
复制标题
格子玻尔兹曼法孔隙尺度数值模拟海底砂泥交替层泥浆侵蚀
DOI：
10.1016/j.jngse.2016.10.003
复制
发表时间：
2016
影响因子：
--
通讯作者：
P. Brumby
中科院分区：
文献类型：
--
作者：
Takero Yoshida;Takuya Yamaguchi;H. Oyama;Toru Sato;Georgios Fytianos;Y. Kano;J. Nagao;N. Tenma;H. Narita;P. Brumby
从海底甲烷水合物中提取商业规模的甲烷气体是困难的。一个主要的挑战是海底地层中砂-泥交替层界面的泥浆侵蚀。如果不清楚与泥浆侵蚀相关的各种参数，开发甲烷水合物矿床可能会出现并发症，例如泥浆颗粒导致储层堵塞。本研究旨在建立一种在孔隙尺度计算域内预测水流对泥浆侵蚀的数值模拟方法。在计算域中数值模拟了细观砂床的生成，并采用晶格玻尔兹曼方法数值模拟了水流在不同形状砂粒孔隙中的流动。将泥浆视为一个连续体，并通过水流的剪切应力在其表面进行侵蚀，使用临界剪切应力和侵蚀速率常数，通过将计算的侵蚀速率与实验室规模实验的结果拟合来估计。利用该数值模型对长期泥沙侵蚀进行了模拟。模拟结果表明，当孔隙空间平均流速大于临界值且小于该临界值的10倍时，约10天后侵蚀速率几乎为零。
Commercial-scale extraction of methane gas from subsea methane hydrate is difficult. A major challenge is mud erosion at the interfaces of sand–mud alternate layers in the subsea strata. Without a clear understanding of the various parameters associated with mud erosion, there may be complications in developing methane hydrate deposits, such as reservoir clogging due to mud particles. This study aims to develop a numerical simulation method to predict mud erosion caused by water flow in pore-scale computational domain. Microscopic sand beds were generated numerically in the computational domain while the water flow through the pores of various-shaped sand grains was numerically simulated using the lattice Boltzmann method. Mud was treated as a continuum and eroded at its surface via the shear stress of water flow using the critical shear stress and erosion rate constant, which were estimated by fitting calculated erosion rates with those of a laboratory-scale experiment. Using this numerical model, simulations of long-term mud erosion were conducted. The simulation showed that when the average velocity of water in the pore space is larger than the critical value and smaller than ten times that value, the erosion rate is almost zero after about 10 days.
影响因子：
4.2
作者：
Fujii, Tetsuya;Suzuki, Kiyofumi;Nagao, Jiro
通讯作者：
Nagao, Jiro