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# HW_2-gradients and unit conversions-1 - Homework#2 Static...

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Homework #2 – Static pressures and unit conversions Due Monday, February 21, 2011, beginning of class This is NOT a team assignment. You should do this on your own. 1) A drilling fluid is reported as having a density of 10 ppg (pounds per gallon). a. What is the specific weight of that fluid in MPa/km and in psi/ft? b. What is the density of the fluid in kg/m 3 ? c. If a driller reports he is drilling balanced in the reservoir at a depth below surface of 15,000 ft using a 10 ppg drilling fluid, what is the pore pressure at that depth? 2) Your density logging tool reads a bulk density of the formation of 2.3 g/cc. Your logging analyst estimates the fluid density in the pores to be 1.1 g/cc, and the rock is a quartz sandstone. What is the porosity? 3) You have another density reading of 2.2 g/cc in a limestone. In this case, there is both brine (1.05 g/cc) and oil (0.9 g/cc) in the pores. The proportion of oil and water is described with the term saturation. In this case, the pores are 70% saturated with oil (S o =0.7) and 30% saturated with brine (S

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