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Numerical modeling of gas recovery from methane hydrate reservoirs.

机译：甲烷水合物气藏采气数值模拟。

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Class 1 hydrate deposits are characterized by a hydrate bearing layer underlain by a two phase, free-gas and water, zone. A Class 1 hydrate reservoir is more preferable than class 2 and class 3 hydrate accumulations because a small change of pressure and temperature can induce hydrate dissociation. In this study, production characteristics from class 1 methane-hydrate reservoirs by means of conventional depressurization technique are studied. In this work, the production characteristics and efficiency from different production strategies (mainly focused on a constant bottom-hole pressure production scheme) such as well-completion locations, well spacing, and production scheduling are investigated.; In the production of conventional gas reservoirs using a constant bottom-hole pressure production scheme, both gas and water production rates exponentially decrease with time. However, for methane-hydrate reservoirs, gas production rate exponentially declines with time whereas water production rate increases with time because methane hydrate dissociation increases water saturation of the reservoir.; The effects of well-completion locations on the production performances are examined. The simulation results indicate that the moving well completion location strategy provides better gas production performance than the fixed completion location strategy. The optimum well-completion location (using a moving completion location strategy) is at the middle of free-gas zone. Due to the effects of hydrate saturation on formation permeability, one should not complete a well in the hydrate zone.; The effect of well spacing on the production efficiency is also investigated. As expected, smaller well-spacing system yields more total gas production and it can dissociate gas-hydrate more rapidly than the larger well-spacing system. However, the number of wells increases when the well-spacing decreases resulting in the increase of the capital investment of the project. Based on this study, when the well-spacing increased about 100 percent (from 45.0 acres to 74.38 acres) the cumulative gas production decreased about 8.4 percent at 1,000 days of production. Therefore, once the similar simulation study for a particular reservoir has been performed, the optimum well spacing for a specific reservoir can be determined.; The effect of well scheduling on the production performance is also examined. In multiple-well systems, starting all production wells at the same time provides faster hydrate dissociation. However, based on this study, starting production wells at different times yields more produced gas (about 10 percent by volume) even though less gashydrate dissociates. Therefore, starting production wells in the multiple-well system at different times could help in improving the gas production efficiency.
机译：1类水合物沉积物的特征是在自由气体和水两相区之下的水合物承载层。 1类水合物储层比2类和3类水合物更优选，因为压力和温度的微小变化会引起水合物解离。在这项研究中，通过常规降压技术研究了1类甲烷水合物储层的生产特征。在这项工作中，研究了不同生产策略（主要侧重于恒定的井底压力生产方案）的生产特征和效率，例如完井位置，井距和生产调度。在使用恒定的井底压力生产方案生产常规气藏的过程中，天然气和水的生产率均随时间呈指数下降。但是，对于甲烷水合物气藏，天然气产量随时间呈指数下降，而由于甲烷水合物的离解增加了气藏的水饱和度，水生产率随时间而增加。检查完井位置对生产性能的影响。仿真结果表明，移动井完井定位策略比固定完井定位策略提供了更好的天然气生产性能。最佳完井位置（使用移动完井位置策略）在自由气区的中间。由于水合物饱和度对地层渗透率的影响，人们不应在水合物层中完井。还研究了井距对生产效率的影响。正如预期的那样，较小的井距系统可产生更多的天然气总量，并且与较大的井距系统相比，它可以更快地分解水合物。但是，当井距减小时，井数增加，导致该项目的资本投资增加。根据这项研究，当井距增加约100％（从45.0英亩到74.38英亩）时，在生产1,000天时的累计天然气产量减少了约8.4％。因此，一旦对特定储层进行了类似的模拟研究，就可以确定特定储层的最佳井距。还检查了井调度对生产性能的影响。在多井系统中，同时启动所有生产井可加快水合物的分解速度。但是，根据这项研究，即使分解的气体水合物较少，在不同时间启动生产井也会产生更多的产出气（约占体积的10％）。因此，在不同时间在多井系统中启动生产井可以帮助提高气体生产效率。

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