Abstract The hydrate dissociation process involves heat transfer in the decomposing zone, multi-phase fluid flow during gas production, and the intrinsic kinetics of hydrate dissociation. The potential impact of laboratory-scale permeability on hydrate exploitation from hydrate-bearing sediments was predicted from a previously developed and verified two-dimensional axisymmetric model. We herein continue the previous work to investigate the influence of core-scale hydrate sediments’ permeability on gas production by the thermal stimulation method. The results show that the gas production in relatively low permeability reservoirs proceeded at a faster rate, requiring less time to complete the dissociation process, although an optimal permeability was associated with the fastest gas production. In addition, with the temperature continuously increased, the dissociation front displaced from the boundary wall to the core axis along the radial direction. In a lower permeability system, however, the hydrate dissociation process at the zone opposite the outlet valve was delayed. Due to the varying processes associated with hydrate dissociation, the overall thermal conductivity declined faster at an earlier stage in sediments of high permeability as compared with sediments of lower permeability. Furthermore, the effects of boundary heat transfer were more significant for low permeability systems.

中文翻译：

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岩心渗透率对甲烷水合物热刺激产气的影响

摘要 水合物分解过程涉及分解带的传热、产气过程中的多相流体流动以及水合物分解的内在动力学。从先前开发和验证的二维轴对称模型预测了实验室规模渗透率对从含水合物沉积物中开采水合物的潜在影响。我们在此继续之前的工作，通过热刺激方法研究岩心水合物沉积物渗透率对产气量的影响。结果表明，在渗透率相对较低的储层中，天然气生产以更快的速度进行，完成解离过程所需的时间更少，尽管最佳渗透率与最快的天然气生产有关。此外，随着温度的不断升高，解离前沿沿径向从边界壁向芯轴位移。然而，在渗透率较低的系统中，出口阀对面区域的水合物分解过程被延迟。由于与水合物分解相关的过程不同，与低渗透率沉积物相比，高渗透率沉积物的整体热导率在早期下降更快。此外，边界传热的影响对于低渗透系统更为显着。与低渗透性沉积物相比，高渗透性沉积物的整体热导率在早期下降更快。此外，边界传热的影响对于低渗透系统更为显着。与低渗透性沉积物相比，高渗透性沉积物的整体热导率在早期下降更快。此外，边界传热的影响对于低渗透系统更为显着。