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.                                      I'm not sure about which formula to use, and should I convert inches to cm?

Calculate the maximum possible porosity and void ratio for a collection of (a) ping pong balls (assume they are 30 mm in diameter) and (b) tiny ball bearings 0.3 mm in diameter

A 8ft clay layer reaches 100% consolidation in 13 years and has a natural water content of 75%, what is the secondary compression settlement in the soil if the building life is expected to be 45 years. Report your answer to three decimal places and in inches. Coefficient of Secondary Compression, Ca 0.04 0.03 0.02 0.01 Type your answer... wy 50 Average Ca for Completely Remolded Samples Falls in This Zone 100 150 200 Natural Water Content, % FIGURE 7-21 Coefficient of secondary compression; C = ratio of decrease in sample height to initial sample height for one cycle of time on a logarithmic scale following completion of primary consolidation. Source: U.S. Department of the Navy (1971). Range Undisturbed Samples: Ca in Range of Virgin Compression Cain Range of Recompression Lies Below This Upper Limit 250 300 350 400

A slug test is performed in a well screened below the water table. The screen is 2 m long, the inside diameter of the casing is 12 cm, and the outside diameter of the well screen is 20 cm. Analyze this test and give the best estimates for Kr and Ss for the formation at this well screen. Give the highest Kr and associated Ss that provide a reasonable fit in the analysis. Do the same for the lowest Kr and associated Ss that provide a reasonable fit.

An oil-water SS displacement experiment was carried out on a 5.0 cm long and 3.0 cm diameter sandstone core plug taken from Duyung-1 well in Terengganu. The porosity of the plug is 25% and the grain density is 2.65 g/cm3. Oil and water densities are 0.85 g/cm3 and 1.05 g/cm3, while viscosities are 2.0 cP and 1.0 cP, respectively. The differential pressure for the test is 12.94 psi. Other data are provided in the following table. Calculate and plot the oil-water relative permeability data and explain the graph

2. (a) 2 kg of dry sand is poured into a Eureka can, where it displaces 755 cm³ of water. Calculate the specific gravity of the sand particle. (b) When a 2 kg of the same sand is poured into a measuring cylinder of diameter 6 cm, it occupies a total volume of 1200 cm³. Calculate the void ratio of the sand and its unit weight in this state. (c) The measuring cylinder is carefully filled with water up to the level of the top of the sand, so that the total volume is still 1200 cm³. Calculate the unit weight of the saturated sand in this condition. (d) The side of the measuring cylinder is tapped gently several times, and the level of the sand surface settles to an indicated volume of 1130 cm³. Calculate the void ratio and the unit weight of the saturated sand in its dense state. Take the unit weight of water yw as 10 kN/m³, and the mass density of water as 1000 kg/m³.

The time for 50% consolidation of a 1-in. thick clay layer (drained at top and bottom) in the laboratory is 2 min, 20 sec. How long (in days) will it take for an 8-ft thick layer of the same clay in the field (under the same pressure increment) to reach 30% consolidation? In the field, there is a rock layer at the bottom of the clay.

Define Mohr–Coulomb Failure Criterion

Describe about the Unconsolidated–undrained (U–U) triaxial test data relationship between total stress, effective stress, and pore water pressure.

Write a brief note about stresses in soil layers. And the effect of degree of saturation on effective stresses