Q2\ Answer T for true statements or F for false ones and correct false ones: 1. Strength of rock decreases with increasing confining pressure. 2. Tensile Failure Cylindrical occurs when: ot<-To. 3. Total stress = effective stress of rock grains - pore Pressure. 4. When the mud weight is high, then at the wellbore wall or is large and o is small. 5. (o.)e=0 = On - 30H – Pw 6. Granular rocks such as sandstones, become stronger the more they are confined. 7. With low o of clay rock strength increases much with increased rock confinement. 8. At large distances from the wellbore, o, cony 9. It is safer to drill parallel to the maximum horizontal stress when drilling a horizontal well iconverge to GH in a relaxed basin. 10. It is safer to drill parallel to the minimum horizontal stress when drilling a horizontal well in a tectonically stressed basin.

Q2\ Answer T for true statements or F for false ones and correct false ones: 1. Strength of rock decreases with increasing confining pressure. 2. Tensile Failure Cylindrical occurs when: ot<-To. 3. Total stress = effective stress of rock grains - pore Pressure. 4. When the mud weight is high, then at the wellbore wall or is large and o is small. 5. (o.)e=0 = On - 30H – Pw 6. Granular rocks such as sandstones, become stronger the more they are confined. 7. With low o of clay rock strength increases much with increased rock confinement. 8. At large distances from the wellbore, o, cony 9. It is safer to drill parallel to the maximum horizontal stress when drilling a horizontal well iconverge to GH in a relaxed basin. 10. It is safer to drill parallel to the minimum horizontal stress when drilling a horizontal well in a tectonically stressed basin.

Principles of Geotechnical Engineering (MindTap Course List)

9th Edition

ISBN:9781305970939

Author:Braja M. Das, Khaled Sobhan

Publisher:Braja M. Das, Khaled Sobhan

Chapter10: Stresses In A Soil Mass

Section: Chapter Questions

Problem 10.1CTP: EB and FG are two planes inside a soil element ABCD as shown in Figure 10.50. Stress conditions on...

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