Measurement of electrical impedance and P-wave velocity of a low permeable sandstone core during the displacement of saturated brine by CO2 injection
Measurement of electrical impedance and P-wave velocity of a low permeable sandstone core during the displacement of saturated brine by CO2 injection
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CO2 驱替饱和盐水过程中低渗透砂岩岩心的电阻抗和纵波速度测量
DOI：
10.1016/j.egypro.2017.03.1629
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发表时间：
2017
期刊：
影响因子：
--
通讯作者：
Hiroyuki Honda
中科院分区：
文献类型：
--
作者：
Hai Huy Nguyen Pham;Shintaro Hisatake;Igor V. Minin;Oleg V. Minin;and Tadao Nagatsuma;Hiroyuki Honda
评价和监测CO2在油藏中的动态，了解CO2在水-CO2混合状态下的流动和分布机理是至关重要的。在油藏条件下，对岩心注入CO2过程中的复阻抗(Z)和纵波速度(Vp)进行了测量。样品为低渗透砂岩，注水速度为超低(低毛细管数(CN)区)至高。除了测量Zp和Vp外，还测量了样品两侧的压差和整个样品的二氧化碳饱和度(SCO2)。根据差压和血氧饱和度的变化观察Zp和Vpp的变化。注入试验结束后，利用阿尔奇定律和Gassmann方程(斑块饱和模型)估算了试件的SCO2横截面。
Evaluating and monitoring the CO2behavior in the reservoir, understanding the mechanism of CO2flow and distribution in the water-CO2mixture state is essential. In this study, measurement of the complex electrical impedance (Z) and P-wave velocity (Vp) is conducted during the CO2injection into the rock core under the reservoir condition. Specimen is low permeable sandstone and injection rate is ultra-low (in the low capillarity number (Cn) area) to high. In addition to measuringZandVp, differential pressure on the both sides of the specimen and CO2saturation (SCO2) of the entire specimen are measured. The change ofZandVpare observed according to the change of differential pressure and SCO2. After the injection test, SCO2in cross-section of the specimen is estimated using Archie's law and Gassmann's equation (Patchy saturation model) to the experimental results.