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...

Extracted 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