Effects of Dissolved Oxygen on Water Imbibition in Gas Shales
| Autor: | Mojtaba Binazadeh, Hassan Dehghanpour, Mingxiang Xu, Ashkan Zolfaghari |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Water mass
Chemistry 020209 energy General Chemical Engineering Energy Engineering and Power Technology 02 engineering and technology 010502 geochemistry & geophysics 01 natural sciences Redox 6. Clean water Matrix (geology) Salinity Fuel Technology Hydraulic fracturing Volume (thermodynamics) 13. Climate action Environmental chemistry 0202 electrical engineering electronic engineering information engineering Imbibition Oil shale 0105 earth and related environmental sciences |
| Zdroj: | Energy & Fuels. 32:4695-4704 |
| ISSN: | 1520-5029 0887-0624 |
| Popis: | Understanding the water uptake of gas shales is critical for designing and optimizing hydraulic fracturing operations during which a large volume of fracturing water containing dissolved oxygen is injected into tight reservoirs. Recent studies show that the dissolved oxygen may promote oxidation reactions which can affect salinity and pH value of flowback water; however, the effects of dissolved oxygen and oxidation reactions on water imbibition into the shale matrix and on the concentration of individual ions in flowback water are still poorly understood. In this study, we conduct water imbibition experiments under degassed and oxic conditions, and measure the imbibed water mass and concentrations of different ions in water. The results show that the initial rate and final amount of water imbibition are higher under degassed conditions compared with that under oxic conditions. These differences are mainly due to the enhanced dissolution of air in the shale pore network into the imbibing water under degas... |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|