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首页> 外文期刊>Marine and Petroleum Geology >Numerical simulations of sand migration during gas production in hydrate-bearing sands interbedded with thin mud layers at site NGHP-02-16
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Numerical simulations of sand migration during gas production in hydrate-bearing sands interbedded with thin mud layers at site NGHP-02-16

机译：含有薄泥土岩砂砂砂砂砂砂湿砂湿气的数值模拟，薄泥层NGHP-02-16

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摘要

The geomechanical behavior of gas hydrate-bearing sands during gas production is complex, involving changes in hydrate-dependent mechanical characteristics and also redistribution of stresses carried by the hydrate. When an interbedded mud layer is present, the complex response of the hydrate-bearing sediments is more pronounced because hydrate dissociation tends to occur preferentially in the sands adjacent to the hydrate-free mud layer, which can act as a heat source. This leads to non-uniform sediment deformation and potentially to shearing deformation along the sand/mud layers. In addition, since the hydrate-bearing sand permeability becomes far greater than the mud permeability with hydrate dissociation, a greater hydraulic gradient may exist along the interface between the sand/mud layers. These two behaviors may contribute to sand migration and thus a thorough study on the effect of a thin interbedded mud layer on the extent of sand migration is necessary. This paper presents numerical sand migration modeling of sand/mud interbedded hydrate-bearing sediments found at Site NGHP-02-16, one of 25 sites drilled as a part of National Gas Hydrate Program Expedition 02 (NGHP-02) in the offshore of India, subjected to depressurization. For a comparison and better understanding, simulation of homogeneous hydrate-bearing sediments is also conducted. It is found that greater sand migration occurs when the interbedded mud layer is present because of greater shearing deformation and greater pressure gradients at sand-mud interface.
机译：气体生产过程中燃气水合物砂的地质力学行为复杂，涉及水合物依赖性机械特性的变化，以及水合物携带的应力再分布。当存在腹层泥浆层时，水合物沉积物的复合响应更加明显，因为水合物解离倾向于优先在与水合物泥层附近的砂体中发生，这可以充当热源。这导致不均匀的沉积物变形，并且可能沿着砂/泥浆层剪切变形。另外，由于携带的水合物砂渗透性远远大于水合物离解的泥浆渗透性，因此沿着砂/泥层之间的界面存在更大的液压梯度。这两种行为可能有助于砂迁移，因此需要对薄互粘土层的效果进行彻底的研究是必要的。本文介绍了位于印度近海的25个站点NGHP-02-16中发现的砂/泥骨骨干沉积物的数值砂迁移建模。 ，经受减压。为了进行比较和更好的理解，还进行了均匀水合物沉积物的模拟。发现，由于砂泥界面处更大的剪切变形和更大的压力梯度，发生更大的泥浆层时发生更大的砂迁移。

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