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Keywords: strength criteria
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Proceedings Papers

Paper presented at the ISRM International Symposium, August 30–September 2, 1989
Paper Number: ISRM-IS-1989-097
... the influence of different peak strength criteria. 1 INTRODUCTION The occurrence of mechanical instabilities, which can result in complete or partial collapse of wellbores, remains a continuing problem in the drilling of deep petroleum boreholes. Instabilities may occur during or shortly after drilling...
Proceedings Papers

Paper presented at the ISRM International Symposium, May 26–28, 1982
Paper Number: ISRM-IS-1982-055
... 2.4. In the classification of rock inclination, it is called an "inclined state" when the angle of slope of the rock is above 15°, and a "flat state" when below 15°. reservoir geomechanics cavern karst cavern cross-section classification Institute strength criteria Reservoir...
Proceedings Papers

Paper presented at the ISRM International Symposium, September 21–24, 1981
Paper Number: ISRM-IS-1981-004
...Proceedings of the International Symposium on Weak Rock / Tokyo /21 -24 September 1981 Shear failure mechanism and strength criteria of a dislocated mudded intercalation LIN WEPING Yangtze Water Conservancy & Hydro -electric Power Research Institute, Wuhan, China 1 INTRODUCTION The foundation rock...

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