Mixing in a three‐phase system: Enhanced production of oil‐wet reservoirs by CO2 injection
Mixing in a three‐phase system: Enhanced production of oil‐wet reservoirs by CO2 injection
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DOI：
10.1002/2015gl066787
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发表时间：
2016-01
影响因子：
5.2
通讯作者：
J. Jiménez‐Martínez;M. L. Porter;J. Hyman;J. Carey;H. Viswanathan
中科院分区：
文献类型：
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作者：
J. Jiménez‐Martínez;M. L. Porter;J. Hyman;J. Carey;H. Viswanathan
我们使用微流体系统重建三相储层条件（高压/高温），并表明使用scCO 2进行再模拟操作（如水力压裂）可以提高混合和生产。这些结果为从深层页岩地层中提取碳氢化合物提供了信息，这在最近产生了一场能源热潮，降低了碳氢化合物的成本。然而，产量迅速下降，需要提高效率或允许对威尔斯井进行再刺激的方法。在我们的实验中，来自初始生产的残留盐水的存在在系统中产生时空变化，导致注入的scCO 2与捕获的烃更有效地相互作用-混合，从而提高采收率。我们将体积平均技术应用于高档盐水饱和度，这使我们能够在充分表征的两相系统框架内分析复杂的三相系统。放大的三相系统表现得像两相系统：更大的混合与更大的非润湿含量和更高的不均匀性。结果与先前在水润湿系统中的观察相反。
We recreate three‐phase reservoir conditions (high‐pressure/temperature) using a microfluidics system and show that the use of scCO2 for restimulation operations, such as hydraulic fracturing, can enhance mixing and production. The results inform hydrocarbon extraction from deep shale formations, which has recently generated an energy boom that has lowered hydrocarbon costs. However, production decreases rapidly and methods to increase efficiency or allow restimulation of wells are needed. In our experiments, the presence of residual brine from initial production creates spatiotemporal variability in the system that causes the injected scCO2 to more effectively interact‐mix with trapped hydrocarbon, thereby increasing recovery. We apply volume‐averaging techniques to upscale brine saturation, which allows us to analyze the complex three‐phase system in the framework of well characterized two‐phase systems. The upscaled three‐phase system behaves like a two‐phase system: greater mixing with larger non‐wetting content and higher heterogeneity. The results are contrary to previous observations in water‐wet systems.