Effects of Carbonate Minerals on Shale-Hydraulic Fracturing Fluid Interactions in the Marcellus Shale

被引:7
|
作者
Ferguson, Brennan [1 ]
Agrawal, Vikas [1 ]
Sharma, Shikha [1 ]
Hakala, J. Alexandra [2 ]
Xiong, Wei [2 ,3 ]
机构
[1] West Virginia Univ, Dept Geol & Geog, Morgantown, WV 26506 USA
[2] US DOE, Natl Energy Technol Lab, Pittsburgh, PA USA
[3] Leidos Res Support Team, Pittsburgh, PA USA
关键词
marcellus shale; hydraulic fracturing; carbonate minerals; chemical additives; hydrocarbons; dissolution; precipitation; oxidation; ADVANCED OXIDATION PROCESS; PRECIPITATION; DEGRADATION; RESERVOIRS; KEROGEN; SODIUM; IMPACT; PYRITE; WATER; BTEX;
D O I
10.3389/feart.2021.695978
中图分类号
P [天文学、地球科学];
学科分类号
07 ;
摘要
Natural gas extracted from tight shale formations, such as the Marcellus Shale, represents a significant and developing front in energy exploration. By fracturing these formations using pressurized fracturing fluid, previously unobtainable hydrocarbon reserves may be tapped. While pursuing this resource, hydraulic fracturing operations leave chemically complex fluids in the shale formation for at least two weeks. This provides a substantial opportunity for the hydraulic fracturing fluid (HFF) to react with the shale formation at reservoir temperature and pressure. In this study, we investigated the effects of the carbonates on shale-HFF reactions with a focus on the Marcellus Shale. We performed autoclave experiments at high temperature and pressure reservoir conditions using a carbonate-rich and a decarbonated or carbonate-free version of the same shale sample. We observed that carbonate minerals buffer the pH of the solution, which in turn prevents clay dissolution. Carbonate and bicarbonate ions also scavenge reactive oxidizing species (ROS), which prevents oxidation of shale organic matter and volatile organic compounds (VOCs). Carbonate-free samples also show higher pyrite dissolution compared to the carbonate-rich sample due to chelation reactions. This study demonstrates how carbonate minerals (keeping all other variables constant) affect shale-HFF reactions that can potentially impact porosity, microfracture integrity, and the release of heavy metals and volatile organic contaminants in the produced water.
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页数:12
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