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首页> 外文会议>European Symposium on Improved Oil Recovery >The Impact of Reservoir Conditions on Capillarity, Multiphase Flow and Hysteresis for CO2-brine Systems
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The Impact of Reservoir Conditions on Capillarity, Multiphase Flow and Hysteresis for CO2-brine Systems

机译：储层条件对二氧化碳 - 盐水系统毛细血管性，多相流动和滞后的影响

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摘要

The multiphase flow properties of the CO2-brine-rock system, capillary pressure, relative permeability, hysteresis and residual trapping, are essential input parameters for modeling CO2 storage and gas injection enhanced oil recovery processes. Due to the nature of CO2 the thermophysical properties of the system, mobility and interfacial tension, change widely across the range of temperature, pressure and brine salinity observed in subsurface systems around the world. This makes the observation of these properties difficult in a laboratory setting and also raises the question as to how, if at all, reservoir conditions impact on the multiphase flow properties for this system. In this work we report the results of a comprehensive set of experiments observing multiphase flow properties, capillary pressure, relative permeability and residual CO2 trapping in sandstone rocks. Berea and Bentheimer sandstones. Each of these properties is observed in the same rock sample at several different conditions of pressure, temperature and brine salinity varied so as to identify the impact that reservoir conditions have on the suite of multiphase flow properties. Experimental conditions are varied systematically across the range 8-25 MPa, 35-120°C and 0-5 mol kg-1, representative of the range subsurface conditions worldwide The observations demonstrate definitively that (1) the CO2-brine system is strongly water wet, (2) the multiphase flow properties of this system are invariant across the range of pressure, temperature and brine salinity in subsurface reservoirs worldwide, (3) the sensitivity of CO2 thermophysical properties to reservoir conditions significantly complicates the measurement of these properties and (4) residual trapping will be a major source of immobilisation for CO2-storage.
机译：CO2-盐水岩系统，毛细管压力，相对渗透率，滞后和残留诱捕的多相流动性质是用于建模CO2储存和气体注入增强的采油过程的基本输入参数。由于CO2的性质，系统的热物理性质，迁移率和界面张力，在世界各地的地下系统中观察到的温度，压力和盐水盐度的广泛变化。这使得在实验室环境中观察这些性质困难，并且还提出了如何，如果有的话，储层条件如何影响该系统的多相流动性能。在这项工作中，我们报告了一系列综合实验的结果，观察了砂岩岩石中的多相流动性能，毛细管压力，相对渗透率和残留CO2诱捕。 Berea和Bentheimer砂岩。在相同的岩石样品中观察到这些性质中的每一个在几个不同的压力条件下，温度和盐水盐度变化，以识别储层条件对多相流动性质套件的影响。实验条件在8-25MPa，35-120°C和0-5摩尔kg-1的范围内系统地变化，代表全球范围的地下条件的观察结果明确表明（1）CO2-盐水系统强烈水潮湿，（2）该系统的多相流动性能在全球地下储层的压力，温度和盐水盐度范围内不变，（3）CO2热物理性能对储层条件的敏感性显着使这些性质的测量变得显着使这些性质的测量变得复杂和（ 4）残余诱捕将是CO2储存的固定源。

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