New digital drilling process monitoring: Instrumentation, validation and calibration
This study aims to enhance the digital drilling process monitoring (DPM) or monitoring while drilling (MWD) technique, which is a widely recognized method in geological exploration for evaluating rock mass quality. First, robust displacement and torque measurement facilities for rotary-core drilling...
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| Format: | Article |
| Language: | English |
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Elsevier
2025-01-01
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| Series: | Journal of Rock Mechanics and Geotechnical Engineering |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1674775524005705 |
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| author | Yanpeng Sun Zuyu Chen Fangcai Xu Yufei Zhao Ruilang Cao Dong Li |
| author_facet | Yanpeng Sun Zuyu Chen Fangcai Xu Yufei Zhao Ruilang Cao Dong Li |
| author_sort | Yanpeng Sun |
| collection | DOAJ |
| description | This study aims to enhance the digital drilling process monitoring (DPM) or monitoring while drilling (MWD) technique, which is a widely recognized method in geological exploration for evaluating rock mass quality. First, robust displacement and torque measurement facilities for rotary-core drilling are discussed. The conventional cable encoder for displacement measurement is replaced with a magnetostrictive displacement sensor, which is more reliable in harsh field drilling environments. This enables the measurement of the bit position with an accuracy of <1 mm. Most importantly, this new instrument is proven to be successful in improving the detection of structural discontinuities with thicknesses >1 mm. In addition, by measuring the electric current of the driving motor, the torque applied to the bit is conveniently and accurately converted. These innovations ensure high-quality data collection for DPM practices. Second, two indices derived from DPM are proposed to quantitatively describe rock mass quality. The specific energy index (SEI) and specific penetration index (SPI) are based on the principles of energy conservation and Mohr-Coulomb failure criterion, respectively. Extensive field tests conducted in a dam grouting area confirm a linear relationship between the thrust force and penetration per rotation, and between the torque and penetration per rotation. The correlation ratios of the related regressions are typically >0.9. These two indices allow for the quantitative interpretation of DPM data into rock mechanics characteristics, such as uniaxial compressive strength, rock quality designation (RQD), and rock mass permeability, eliminating the need for subjective judgment normally involved in the currently used rock mass quality rating approaches. |
| format | Article |
| id | doaj-art-28c3568d18634ebe906fd5b3092e44d6 |
| institution | Kabale University |
| issn | 1674-7755 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Journal of Rock Mechanics and Geotechnical Engineering |
| spelling | doaj-art-28c3568d18634ebe906fd5b3092e44d62025-01-17T04:49:14ZengElsevierJournal of Rock Mechanics and Geotechnical Engineering1674-77552025-01-011713154New digital drilling process monitoring: Instrumentation, validation and calibrationYanpeng Sun0Zuyu Chen1Fangcai Xu2Yufei Zhao3Ruilang Cao4Dong Li5State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China; State Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins, China Institute of Water Resources and Hydropower Research, Beijing, 100048, ChinaState Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China; State Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins, China Institute of Water Resources and Hydropower Research, Beijing, 100048, China; Corresponding author. State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, 710048, China.Sinohydro Foundation Engineering Co., Ltd., Tianjin, 301700, ChinaState Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins, China Institute of Water Resources and Hydropower Research, Beijing, 100048, ChinaState Key Laboratory of Simulation and Regulation of the Water Cycle in River Basins, China Institute of Water Resources and Hydropower Research, Beijing, 100048, ChinaNorth China Institute of Science & Technology, Langfang, 065201, ChinaThis study aims to enhance the digital drilling process monitoring (DPM) or monitoring while drilling (MWD) technique, which is a widely recognized method in geological exploration for evaluating rock mass quality. First, robust displacement and torque measurement facilities for rotary-core drilling are discussed. The conventional cable encoder for displacement measurement is replaced with a magnetostrictive displacement sensor, which is more reliable in harsh field drilling environments. This enables the measurement of the bit position with an accuracy of <1 mm. Most importantly, this new instrument is proven to be successful in improving the detection of structural discontinuities with thicknesses >1 mm. In addition, by measuring the electric current of the driving motor, the torque applied to the bit is conveniently and accurately converted. These innovations ensure high-quality data collection for DPM practices. Second, two indices derived from DPM are proposed to quantitatively describe rock mass quality. The specific energy index (SEI) and specific penetration index (SPI) are based on the principles of energy conservation and Mohr-Coulomb failure criterion, respectively. Extensive field tests conducted in a dam grouting area confirm a linear relationship between the thrust force and penetration per rotation, and between the torque and penetration per rotation. The correlation ratios of the related regressions are typically >0.9. These two indices allow for the quantitative interpretation of DPM data into rock mechanics characteristics, such as uniaxial compressive strength, rock quality designation (RQD), and rock mass permeability, eliminating the need for subjective judgment normally involved in the currently used rock mass quality rating approaches.http://www.sciencedirect.com/science/article/pii/S1674775524005705Drilling process monitoringSpecific penetration indexSpecific energy indexFracture identification |
| spellingShingle | Yanpeng Sun Zuyu Chen Fangcai Xu Yufei Zhao Ruilang Cao Dong Li New digital drilling process monitoring: Instrumentation, validation and calibration Journal of Rock Mechanics and Geotechnical Engineering Drilling process monitoring Specific penetration index Specific energy index Fracture identification |
| title | New digital drilling process monitoring: Instrumentation, validation and calibration |
| title_full | New digital drilling process monitoring: Instrumentation, validation and calibration |
| title_fullStr | New digital drilling process monitoring: Instrumentation, validation and calibration |
| title_full_unstemmed | New digital drilling process monitoring: Instrumentation, validation and calibration |
| title_short | New digital drilling process monitoring: Instrumentation, validation and calibration |
| title_sort | new digital drilling process monitoring instrumentation validation and calibration |
| topic | Drilling process monitoring Specific penetration index Specific energy index Fracture identification |
| url | http://www.sciencedirect.com/science/article/pii/S1674775524005705 |
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