Journal
FUEL
Volume 330, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.fuel.2022.125533
Keywords
Enhanced oil recovery; Carbonate reservoir; Heterogeneity; 2.5D micromodels; CO2 channeling
Categories
Funding
- National Natural Science Foundation [52004310]
- Science Foundation of China University of Petroleum, Beijing [2462020YXZZ048]
- Strategic Cooperation Technology Projects of CNPC and CUPB [ZLZX2020-01]
- PetroChina Innovation Foundation [2019D-5007-0211]
- Scientific Research and Technology Development Project of CNPC [2018D- 4407]
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Carbonate reservoirs have great potential for CO2 geological sequestration and enhanced oil recovery, and the use of NPs-armor stabilized CO2 foams can effectively control CO2 mobility.
Carbon dioxide enhanced oil recovery (CO2-EOR) is one of the significant technologies to increase oil production and also to reduce greenhouse gas emissions. Carbonate reservoirs distribute widely in the world and show an extremely potential for CO2 geological sequestration and enhanced oil recovery, which is a promising technology for CCUS. However, the complex interfacial properties and strong heterogeneity of carbonate reservoirs lead to serious CO2 channeling, resulting in poor carbon sequestration. Microfluidic experiments in synthetic charac-terization of strongly heterogeneous reservoirs are a novel method to study multiphase flow in porous media. In this study, a heterogeneous micromodel was prepared using sequential photolithography and calcium carbonate (CaCO3) in-situ growth technique, which was used to construct CaCO3 layer by crystallization on the micro -channel surface. The micromodel was represented by a 2.5-dimensional (2.5D) network of pores and fractures at different depths, which was used to simulate the natural structure of carbonate reservoir. The morphological and structural characteristics of the 2.5D micromodel were characterized using scanning electron microscopy, atomic force microscopy, and profilometer. The surface wettability was characterized by determining the contact angle. The results showed that a 1-2 mu m layer of CaCO3 grew on the microchannel surface, and the channel surface tended to hydrophobicity. The flow behavior of CO2 in reservoirs and the capacity of foam to control CO(2 )mobility were simulated using 2.5D micromodels. Among them, CO2 channeling is more obvious and realistic in micromodel. Accordingly, foams with and without nanoparticles (NPs) armor were used to control CO2 mobility. The bubble disproportionation, and liquid drainage of bare surfactant foam induced gas-liquid separation in fractures and pores. Subsequent big and soft bubbles illustrated poor CO2 mobility control performance, and the micro-fractures and pores were not effectively swept and stored with CO2. Extremely stable CO2 foam was ob-tained with the construction of NPs-armor on foam films, more conducive to the trapping of CO2 in bubbles. The findings of this study can help understand complex CO2 flow behavior in carbonate reservoirs and presents a promising method with NPs-armor stabilized CO2 foams for carbon sequestration and enhanced oil recovery in carbonate reservoirs.
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