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Pressure Variation in a Fluid at Rest 1. In April 2010, the Deepwater Horizon drilling rig experienced a severe explosion and fire and sank off the coast of Louisiana. Eleven persons died, and 17 others were injured. The resulting uncontrolled oil release from the damaged well being drilled persisted for almost 4 months. The rig was in the process of closing an exploratory oil well in the Gulf of Mexico. The seafloor at the well site was 5,067 ft below the water surface, and the petroleum reservoir was located 18,360 ft below the water surface. One cement plug had been placed at this lower depth, and a second cement plug was being completed at the time of the explosion. A key issue in the investigation of the explosion is the decision to replace drilling fluid (a.k.a. %u201Cdrilling mud%u201D) with seawater in the well pipe prior to installation of the upper cement plug. Drilling fluid is an engineered mixture of water, polymers, clay, and other material that serves a variety of purposes including acting as a dense counterweight to the high pressure of the petroleum reservoir. Some experts have hypothesized that removal of the drilling fluid in favor of less dense seawater allowed a high pressure methane bubble to move up the well pipe (a %u201Cblowout%u201D). Determine the pressure (psi) at the bottom of the well pipe (depth 18,360 ft) if drilling fluid of specific weight 17 lb/gal were left in place between the seafloor and the petroleum reservoir. Remember that pressure at the seafloor would include hydrostatic pressure due to the seawater (\(\gamma=64 lb/ft^3\)). Determine the pressure (psi) at the bottom of the well pipe if all drilling fluid were replaced by seawater.
The pollutant has a reaction rate coeeficient k of 0.25/day. Assuming is pollutant is well mixed in the lake, find the steady-state concentration of pollutant in the lake.
A 100-ton train traveling on a horizontal track requires 400 hp to maintain a constant speed of 50 mi/h. Determine (a) the total force needed to overcome axle friction, rolling resistance, and air resistance
the three forces of magnitude P can be replaced by a single, equivalent force R acting at point A. Determine the distance x and the magnitude and direction of R
The 50mm radius pulley A of the clothes dryer rotates with an angular acceleration of (80^(1/2)A) rad/s, where angle A is in radians. Determine its angular acceleration when t= 2 , starting from rest.
Find the percentage of Air voids and voids in the mineral aggregate if the asphalt absorption is .5%, and the specific gravities of the aggregate and binder are 2.660 and 1.020 respectively. The unit weight of the mixture is 2.39 Mg/m^3
A flat rectangular metal plate measures 17.63 + and - 0.02 inches by 26.85 + and - 0.04 inches. A circular hole of diameter 11.42 + and - 0.03 inches is cut out of the plate.
The average flow rate is 0.050 m3/s.If the BOD5 removal efficiency is 30%, How many kg of BOD5 are removed in the primary settling tank each day
The crate has a wieght of W = 350lb., and the coefficients of static and kinetic friction are us = 0.3 and uk = 0, respectively. Determine the friction force on the floor. Theta = 45 degrees and P = 100lb.
An investigation at a particular site reveald 10 m of clay overlying 2m of sand resting on bedrock.the water table was found to be at the ground surface and the piezometric level for the sand to be 2m above ground level
Sometimes the side of concrete bridges is observed to turn black in colour. What is the reason for this phenomenon?
Piezometer A is located 3000 feet due south of piezometer B. Piezometer C is located 2000 feet due west of piezometer B. The surface elevations of A, B and C are 480, 610 and 545 feet respectively. The depth to water in A is 40 feet, in B is 140 f..
A four-wheel tractor whose operating weight is 47,877 lb is pulled up a road whose slope is +3.5% at a uniform speed. If the average tension in the towing cable is 4,860lb, what is the rolling resistance of the road
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