【摘要】 将天然气水合物体看作一流场,运用Darcy线性渗流规则建立了水合物热水分解前缘的一维三相质量传递数学模型,对其进行数值求解和线性化处理并给出了迭代计算过程。结合一维分解模型算例得出了水合物分解过程规律:水合物储层渗透率随着距离增加而降低至未分解区域渗透率12.5×10?9m2,随着分解时间增加渗透率增大到多孔介质渗透率55×10?9m2。储层水合物饱和度随着距离增加而增加至初始饱和度45%,随着分解时间增加而降低。含水饱和度随着距离增加而降低至束缚水饱和度17%,随着时间增加而增大。水合物储层压力随着距离增加而增加,但由于边界作用低于初始压力3.0MPa,随着时间增加压力降低,下降幅度减慢。更多还原

【Abstract】 Natural gas hydrate reservoir was treated as a flow field, and three-phase one-dimensional mass-transfer mathematical models of hot water dissociation frontal brim for natural gas hydrate was built based on the Darcy-s Law of lineal seepage. These models were solved by numerical methods and also handled with linearization methods. Moreover, the process of iterative computation was presented. The mathematical models show some trends for the hot water dissociation processes: The permeability of the hydrate reservoir decreases with the increase of distance and to be 12.5×10-9m2 in un-decomposed zones. It increases with the increase of dissociation time and to be 55×10-9m2 in porous medium. Hydrate saturation in the reservoir increases to initial saturation of 45% with the increase of distance and decreases with the increase of dissociation time. Water saturation decreases to bound water saturation of 17% with the increase of distance, and it increases with the increase of dissociation time. Pressure of hydrate reservoir increases with the increase of distance but is lower than the initial pressure of 3.0 MPa, and its decrease rate becomes slower with the dissociation time.更多还原