CAJ | 학술논문

天然气水合物开采过程中水合物饱和度的变化会引起储层渗透率的相应变化，对开采过程造成影响。为研究天然气水合物对多孔介质渗流特性的影响，本文基于孔隙网络模型模拟研究了水合物生成于壁面与中心两种方式下，多孔介质渗流特性变化，并与相关模型进行比较。结果表明，水合物生成于中心时绝对渗透率小于生成于壁面时；水合物饱和度相同时多孔介质孔径越大，渗透率越大；水合物生成于中心时两相相对渗透率等渗点小于生成于壁面时；当水合物饱和度变化时两相相对渗透率几乎不变。说明了储层渗透率与水合物饱和度之间有相对应的关系。
천연기수합물개채과정중수합물포화도적변화회인기저층삼투솔적상응변화，대개채과정조성영향。위연구천연기수합물대다공개질삼류특성적영향，본문기우공극망락모형모의연구료수합물생성우벽면여중심량충방식하，다공개질삼류특성변화，병여상관모형진행비교。결과표명，수합물생성우중심시절대삼투솔소우생성우벽면시；수합물포화도상동시다공개질공경월대，삼투솔월대；수합물생성우중심시량상상대삼투솔등삼점소우생성우벽면시；당수합물포화도변화시량상상대삼투솔궤호불변。설명료저층삼투솔여수합물포화도지간유상대응적관계。
The change of hydrate saturation in the process of natural gas hydrate exploitation will cause the corresponding change of reservoir permeability. And it will affect the process of natural gas hydrate exploitation. To study the effect of natural gas hydrate on porous media seepage characteristics,the pore network model is applied to study the change of seepage characteristics of porous media. Hydrate forms in two ways,which are wall surface and pore center,compared with relevant models. It is found that the absolute permeability of hydrate formation the pore center is less than that generated on wall surface. When the hydrate saturation is the same,the radius of porous media is larger,then the permeability is bigger. The isotonic point of two phase relative permeability of hydrate formation in pore center is less than that generated on wall surface. When hydrate saturation changes,two phase relative permeability is almost constant. It also gives the corresponding relationship between reservoir permeability and hydrate saturation.