Brine flood in a 1.9-in-long and 1.5-in-diameter core plug from the north sea resulted in a stabilized pressure drop of 46.05 psi. the flood was carried out at 0.05 ml/min with brine viscosity of 0.443 cp. determine the absolute permeability of this plug in millidarcies.

Awall of 0.5m thickness is to be constructed from a material which has average thermal conductivity of 1.4 w/mk. the wall is to be insulated with a material having an average thermal conductivity of 0.35 w/mk so that heat loss per square meter shall not exceed 1450 w. assume inner wall surface temperature of 1200°c and outer surface temperature of the insulation to be 15°c. calculate the thickness of insulation required.