I whle drilling a well a rock layer Is encountered at 10000 ft. depth with an excess pressure (overpressure) of 150 psl. An overpressure zone has fluld pressures In excess of the hydrostati gradlent. If the overburden densfty Is 2400 kg/m" and the fluld column Is water what Is the effectIve stress at this depth? 5921.17 psl 57.68 MPa 4127.6psl 5549.0psl

Fundamentals of Geotechnical Engineering (MindTap Course List)
5th Edition
ISBN:9781305635180
Author:Braja M. Das, Nagaratnam Sivakugan
Publisher:Braja M. Das, Nagaratnam Sivakugan
Chapter12: Subsurface Exploration
Section: Chapter Questions
Problem 12.4P
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50. Whle drlling a well a rock layer Is encountered at 10000 ft. depth with an excess preSsure
(overpressure) of 150 psl. An overpressure zone has fluld pressures In excess of the hydrostatic
gradlent. If the overburden density Is 2400 kg/m* and the flutd column Is water what Is the
effective stress at this depth?
a.
b.
57.68 MPa
4127.6psl
d.
5549.0psl
Transcribed Image Text:50. Whle drlling a well a rock layer Is encountered at 10000 ft. depth with an excess preSsure (overpressure) of 150 psl. An overpressure zone has fluld pressures In excess of the hydrostatic gradlent. If the overburden density Is 2400 kg/m* and the flutd column Is water what Is the effective stress at this depth? a. b. 57.68 MPa 4127.6psl d. 5549.0psl
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