Reactive Transport Models with Geomechanics to Mitigate Risks of CO2 Utilization and Storage

doi:10.2172/1261781

GSTDTAP > 地球科学

DOI	10.2172/1261781
报告编号	None
来源ID	OSTI ID: 1261781
	Reactive Transport Models with Geomechanics to Mitigate Risks of CO2 Utilization and Storage
	Deo, Milind; Huang, Hai; Kweon, Hyukmin; Guo, Luanjing
	2016-03-28
出版年	2016
页数	76
语种	英语
国家	美国
领域	地球科学
英文摘要	Reactivity of carbon dioxide (CO₂), rocks and brine is important in a number of practical situations in carbon dioxide sequestration. Injectivity of CO₂ will be affected by near wellbore dissolution or precipitation. Natural fractures or faults containing specific minerals may reactivate leading to induced seismicity. In this project, we first examined if the reactions between CO₂, brine and rocks affect the nature of the porous medium and properties including petrophysical properties in the timeframe of the injection operations. This was done by carrying out experiments at sequestration conditions (2000 psi for corefloods and 2400 psi for batch experiments, and 600Â°C) with three different types of rocks â sandstone, limestone and dolomite. Experiments were performed in batch mode and corefloods were conducted over a two-week period. Batch experiments were performed with samples of differing surface area to understand the impact of surface area on overall reaction rates. Toughreact, a reactive transport model was used to interpret and understand the experimental results. The role of iron in dissolution and precipitation reactions was observed to be significant. Iron containing minerals â siderite and ankerite dissolved resulting in changes in porosity and permeability. Corefloods and batch experiments revealed similar patterns. With the right cationic balance, there is a possibility of precipitation of iron bearing carbonates. The results indicate that during injection operations mineralogical changes may lead to injectivity enhancements near the wellbore and petrophysical changes elsewhere in the system. Limestone and dolomite cores showed consistent dissolution at the entrance of the core. The dissolution led to formation of wormholes and interconnected dissolution zones. Results indicate that near wellbore dissolution in these rock-types may lead to rock failure. Micro-CT images of the cores before and after the experiments revealed that an initial high-permeability pathway facilitated the formation of wormholes. The peak cation concentrations and general trends were matched using Toughreact. Batch reactor modeling showed that the geometric factors obtained using powder data that related effective surface area to the BET surface area had to be reduced for fractured samples and cores. This indicates that the available surface area in consolidated samples is lower than that deduced from powder experiments. Field-scale modeling of reactive transport and geomechanics was developed in parallel at Idaho National Laboratory. The model is able to take into account complex chemistry, and consider interactions of natural fractures and faults. Poroelastic geomechanical considerations are also included in the model.
URL	查看原文
来源平台	US Department of Energy (DOE)
引用统计
文献类型	科技报告
条目标识符	http://119.78.100.173/C666/handle/2XK7JSWQ/7357
专题	地球科学
推荐引用方式 GB/T 7714	Deo, Milind,Huang, Hai,Kweon, Hyukmin,et al. Reactive Transport Models with Geomechanics to Mitigate Risks of CO2 Utilization and Storage,2016.