1. Compute the time for saline water to reach rebar in a 3 meter deep saltwater holding tank constructed of reinforced concrete (rebar cover is 40mm). Assume the tank has been filled an average of half full since the time of construction. The porosity of the concrete is 0.2. The coefficient of capillary suction is 0.67. The coefficient of permeability is 5.6 x 109m/sec. Assume a constant pressure head formulation.

A decision has to be made on wether touse 3 in or 4 in ID tubing for a well with the flowing conditions: steady state flow Initial =2500 psi Pressure PI=2.0STB/psi Bubble point pressure =1200 psi Depth(TVD)=5000ft Required THP=300psi GOR=200 SCF/bbI

1. (e) One of the limitations of extending axis translation technique for measuring negative pore water pressure using null type pressure plate is: (i)Air diffusion occurs through the ceramic disk when the axis translation test is performed for a long time period. (ii) Water losses from specimen when the test is performed for a long time period. (iii) Secondary consolidation arises when test is performed for a long period of time (iv) All the above (a, b and c) (v) None of the above The ceramic disk used in the null pressure plate apparatus does not allow the air to flow; however, free flow water is possible. Explain the mechanism associated with this behavior. If the purpose of ceramic disk is not to allow the air out from it; how can the air come out from the specimen? What will be the impact of such a phenomenon?

Determine the flow rate of air through an axial bush seal. The outer diameter of the inner cylinder is 250 mm and the radial clearance is 0.2 mm. The length of the seal is 100 mm. The pressures upstream and downstream of the seal are 1.5 and 1.01 bar, respectively. The viscosity of air can be taken as 1.85 x 10 SPas. m/s