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http://dx.doi.org/10.7474/TUS.2022.32.5.285

Report on Extended Leak-Off Test Conducted During Drilling Large Diameter Borehole  

Jo, Yeonguk (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Song, Yoonho (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Park, Sehyeok (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Kim, Myung Sun (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Park, In-Hwa (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Lee, Changhyun (Deep Subsurface Storage and Disposal Research Center, Geology Division, Korea Institute of Geoscience and Mineral Resources)
Publication Information
Tunnel and Underground Space / v.32, no.5, 2022 , pp. 285-297 More about this Journal
Abstract
We report results of Extended Leak-Off Test (XLOT) conducted in a large diameter borehole, which is drilled for installation of deep borehole geophysical monitoring system to monitor micro-earthquakes and fault behavior of major fault zones in the southeastern Korean Peninsula. The borehole was planned to secure a final diameter of 200 mm (or more) at a depth of ~1 km, with 12" diameter wellbore to intermediate depths, and 7-7/8" (~200 mm) to the bottom hole depth. We drilled first the 12" borehole to approximately 504 m deep and installed American Petroleum Institute standard 8-5/8" casing, then annulus between the casing and bedrock was fully cemented. XLOT was carried out for several purposes such as confirming casing and cementing integrity, measuring rock stress states. To that end, we drilled additional 4 m long open hole interval to directly inject water and pressurize into the rock mass using the upper API casings. During the XLOT, flow rates and interval pressures were recorded in real time. Based on the logs we tried to analyze hydraulic conductivity of the test interval.
Keywords
Borehole; Extended Leak-Off Test (XLOT); Flow rate; Interval pressure; Rock mass permeability;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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