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Experimental Investigation of Microscopic Mechanisms of Surfactant-Enhanced Spontaneous Imbibition in Shale Cores
Experimental Investigation of Microscopic Mechanisms of Surfactant-Enhanced Spontaneous Imbibition in Shale Cores
- Source :
- Energy & Fuels. 33:7188-7199
- Publication Year :
- 2019
- Publisher :
- American Chemical Society (ACS), 2019.
-
Abstract
- Adding surfactants in fracturing fluids is a practical method for enhancing spontaneous imbibition of shale oil reservoirs. However, both positive and negative observations are found in the field practice. The mechanisms of different types of surfactants for enhancing spontaneous imbibition still need further investigation. In this work, we applied the nuclear magnetic resonance technique to measure the fluid distributions in shale pores during the spontaneous imbibition process. We found that surfactants mainly recover oil in the macropores but have less impact on the production of oil in the micropores. Combining with scanning electron microscopy, high-pressure mercury intrusion, and X-ray diffraction experiments, the pore structure and mineral composition of shales are carefully analyzed. We observed that the surfaces of large pores are mostly quartz and feldspars, while the surfaces of small pores are organic matter and clay. The wettability of a shale rock is a key factor affecting spontaneous imbibi...
- Subjects :
- chemistry.chemical_classification
Materials science
Macropore
Scanning electron microscope
General Chemical Engineering
Energy Engineering and Power Technology
02 engineering and technology
021001 nanoscience & nanotechnology
Fuel Technology
020401 chemical engineering
chemistry
Chemical engineering
Shale oil
Organic matter
Imbibition
Wetting
0204 chemical engineering
0210 nano-technology
Quartz
Oil shale
Subjects
Details
- ISSN :
- 15205029 and 08870624
- Volume :
- 33
- Database :
- OpenAIRE
- Journal :
- Energy & Fuels
- Accession number :
- edsair.doi...........b450dda178c6f7b8bc3bc61dc327bac1
- Full Text :
- https://doi.org/10.1021/acs.energyfuels.9b01324