Characteristics and Influencing Factors for Forced Imbibition in Tight Sandstone Based on Low-Field Nuclear Magnetic Resonance Measurements
| Autor: | Yun Jiang, Xinghang Zeng, Ying Gao, Xiu-ling Han, Chen Jia, Yang Shi, Guoqing Xu |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Atmospheric pressure 020209 energy General Chemical Engineering Energy Engineering and Power Technology 02 engineering and technology Mechanics Low field nuclear magnetic resonance Salinity Pore water pressure Fuel Technology 020401 chemical engineering 0202 electrical engineering electronic engineering information engineering Osmotic pressure Hydraulic fluid Imbibition Boundary value problem 0204 chemical engineering |
| Zdroj: | Energy & Fuels. 32:8230-8240 |
| ISSN: | 1520-5029 0887-0624 |
| DOI: | 10.1021/acs.energyfuels.8b01608 |
| Popis: | Spontaneous imbibition (SI) generally occurs under forced pressure (the difference between hydraulic fluid pressure and original pore pressure) during shut-in time. However, the experimental study of SI is commonly performed at atmospheric pressure and the effect of the forced pressure is often neglected. How the forced pressure influences the SI behaviors under different factors is still not clear. In this paper, low-field nuclear magnetic resonance (LF-NMR) was adopted to study the mechanism of SI in the tight sandstone rock sample under forced pressure (forced imbibition, FI). The effects of boundary conditions, initial water saturation, bedding plane (BP) direction, and fluid salinity on oil recovery were also systematically investigated. Results showed that the ultimate oil recovery (UOR) varied from different boundary conditions. An inverse correlation also exists between the water uptake and salinity. As osmotic pressure exists, more water was imbibed into core samples with the decrease of KCl sali... |
| Databáze: | OpenAIRE |
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