| Title: | A geostress measurement method based on an integrated drilling and optical microscopic imaging system |
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| Authors: | ID Wang, Jinchao (Author)
ID Wang, Chunying (Author)
ID Han, Zengqiang (Author)
ID Wang, Yiteng (Author)
ID Tang, Xinjian (Author)
ID Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru (Copyright holder) |
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| Files: |  Acta_geotechnica_slovenica_2018_Wang_et_al._A_geostress_measurement_method_based_on_an_integrated_drilling_and_optical_microscopic_imagi.pdf (1,26 MB)
MD5: 2340BDDCE54370E85F644EC8EE5134FA
PID: 20.500.12556/dkum/a0531ef8-c741-48a2-9ecd-e5ee91839fa5
 http://fgserver6.fg.um.si/journal-ags/2018-1/article-2.asp
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| Language: | English |
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| Work type: | Scientific work |
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| Typology: | 1.01 - Original Scientific Article |
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| Organization: | FGPA - Faculty of Civil Engineering, Transportation Engineering and Architecture
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| Abstract: | Conventional geostress measurement methods are limited by deficiencies including the measurable depth, the complexity, and the long duration of operation. To address these problems and achieve the measurement of geostress in deep wells under conditions of complex high pressures and high temperatures, we propose a new measurement method for geostress based on an integrated drilling and optical microscopy system. Its innovative integrated structure eliminates the problems associated with complex procedures and depth limits, and avoids rock creep caused by long delays, significantly improving the accuracy and range of the measurements. It works by using microscopic imaging and direct contact probes to capture the changes of a borehole’s cross-sectional outlines before and after stress relief. The resulting images are analyzed with search circles to obtain the positions of probe apices, which can be fitted into ellipses that describe the outlines, and calculate the state of the stress. The validity and accuracy of the method was verified by in-door tests and field applications in the ZK1 borehole. The results show that: (1) the integrated system can be used to measure micrometer-grade deformations; (2) the searchcircle approach can accurately obtain the positions of probe apices; and (3) the stress measurement method based on the system is accurate and feasible. |
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| Keywords: | geostress, probe, optical microscopy, measurement while drilling, search circle |
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| Publication status: | Published |
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| Publication version: | Version of Record |
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| Year of publishing: | 2018 |
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| Number of pages: | str. 17-27 |
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| Numbering: | Letn. 15, št. 1 |
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| PID: | 20.500.12556/DKUM-72663  |
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| ISSN: | 1854-0171 |
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| ISSN on article: | 1854-0171 |
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| COBISS.SI-ID: | 305146880 |
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| DOI: | 10.18690/actageotechslov.15.1.17-27.2018 |
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| NUK URN: | URN:SI:UM:DK:8BVLUJFU |
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| Copyright: | Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo Univerze v Mariboru |
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| Publication date in DKUM: | 11.10.2018 |
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| Views: | 1594 |
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| Downloads: | 591 |
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| Metadata: |    |
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| Categories: | Misc.
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