Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement
Laboratory core nuclear magnetic resonance (NMR) relaxation measurements offer geological information, including rock porosity and oil saturation, relevant to logging. When core samples drilled from wells are exposed to air, the fluids within their pores inevitably dissipate. This phenomenon may lea...
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MDPI AG
2024-11-01
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| author | Zhongshu Liao Gong Zhang Yingying Ma |
| author_facet | Zhongshu Liao Gong Zhang Yingying Ma |
| author_sort | Zhongshu Liao |
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| description | Laboratory core nuclear magnetic resonance (NMR) relaxation measurements offer geological information, including rock porosity and oil saturation, relevant to logging. When core samples drilled from wells are exposed to air, the fluids within their pores inevitably dissipate. This phenomenon may lead to discrepancies between the results of nuclear magnetic resonance relaxation experiments and the actual situation underground. To deeply explore the impact of fluid dissipation on NMR core analysis experimental results, a series of simulated dissipation experiments were designed under constant temperature and humidity conditions. Variations in one-dimensional and two-dimensional NMR measurement results of oil-saturated samples were examined under varying crude oil viscosities and dissipation times. The experimental results indicate that as exposure time increases, the T<sub>2</sub> distribution of oil-saturated cores decreases, and the amplitude of the T<sub>2</sub> distribution peaks decreases. Both oil and water relaxation components show a decreasing trend; however, the dissipation rate of the bounding water component significantly exceeds that of the crude oil component. By employing two-dimensional NMR relaxation time distribution fluid quantitative analysis technology, the relationship between the dissipation rates of various phase fluids and exposure time during the stable dissipation stage was analyzed. This offers a reference for adjusting the oil saturation of exposed cores based on NMR measurements. |
| format | Article |
| id | doaj-art-cd0514095872403e810f7759e6eddb4b |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
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| series | Applied Sciences |
| spelling | doaj-art-cd0514095872403e810f7759e6eddb4b2025-08-20T02:26:59ZengMDPI AGApplied Sciences2076-34172024-11-0114221074610.3390/app142210746Experimental Study on Fluid Dissipation Effects in Core Samples by NMR MeasurementZhongshu Liao0Gong Zhang1Yingying Ma2Key Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430102, ChinaKey Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430102, ChinaKey Laboratory of Oil and Gas Resources and Exploration Technology, Ministry of Education, College of Geophysics and Petroleum Resources, Yangtze University, Wuhan 430102, ChinaLaboratory core nuclear magnetic resonance (NMR) relaxation measurements offer geological information, including rock porosity and oil saturation, relevant to logging. When core samples drilled from wells are exposed to air, the fluids within their pores inevitably dissipate. This phenomenon may lead to discrepancies between the results of nuclear magnetic resonance relaxation experiments and the actual situation underground. To deeply explore the impact of fluid dissipation on NMR core analysis experimental results, a series of simulated dissipation experiments were designed under constant temperature and humidity conditions. Variations in one-dimensional and two-dimensional NMR measurement results of oil-saturated samples were examined under varying crude oil viscosities and dissipation times. The experimental results indicate that as exposure time increases, the T<sub>2</sub> distribution of oil-saturated cores decreases, and the amplitude of the T<sub>2</sub> distribution peaks decreases. Both oil and water relaxation components show a decreasing trend; however, the dissipation rate of the bounding water component significantly exceeds that of the crude oil component. By employing two-dimensional NMR relaxation time distribution fluid quantitative analysis technology, the relationship between the dissipation rates of various phase fluids and exposure time during the stable dissipation stage was analyzed. This offers a reference for adjusting the oil saturation of exposed cores based on NMR measurements.https://www.mdpi.com/2076-3417/14/22/10746core analysisT<sub>1</sub>-T<sub>2</sub>fluid dissipationcrude oil viscosity |
| spellingShingle | Zhongshu Liao Gong Zhang Yingying Ma Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement Applied Sciences core analysis T<sub>1</sub>-T<sub>2</sub> fluid dissipation crude oil viscosity |
| title | Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement |
| title_full | Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement |
| title_fullStr | Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement |
| title_full_unstemmed | Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement |
| title_short | Experimental Study on Fluid Dissipation Effects in Core Samples by NMR Measurement |
| title_sort | experimental study on fluid dissipation effects in core samples by nmr measurement |
| topic | core analysis T<sub>1</sub>-T<sub>2</sub> fluid dissipation crude oil viscosity |
| url | https://www.mdpi.com/2076-3417/14/22/10746 |
| work_keys_str_mv | AT zhongshuliao experimentalstudyonfluiddissipationeffectsincoresamplesbynmrmeasurement AT gongzhang experimentalstudyonfluiddissipationeffectsincoresamplesbynmrmeasurement AT yingyingma experimentalstudyonfluiddissipationeffectsincoresamplesbynmrmeasurement |