HWK 9 solution-1

# HWK 9 solution-1 - PGE 430 HWK 9 Solution Due in lecture...

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PGE 430 HWK 9 Solution Due in lecture Nov. 13 th . (1) Using the charts on the last page, please determine the mud flow rate, the bit nozzle diameters, the total WOB, and the surface pump pressure to balance the motor bearings if: (each worth 1 pt for a total of 4 pts) The 8”, P150 motor must turn 200 rpm. The WOB required to make the bit drill is 10,000 lbs (in addition to the WOB to balance the pressure thrust through the motor). The bit has five nozzles. Recall that the required pump pressure is the summation of the friction pressure in the pipe and annulus, the pressure drop through the motor, and the pressure drop through the bit. You may use your hydraulics spread sheet to make the calculations. The drill string is as follows: Drill pipe = 4.5” x 3.6” ID; Drill Collars = 6.25” x 2.5” x 300’ in length; Hole Depth = 8,000’; Bit diameter = 9 7/8”; Mud weight = 11 ppg, viscosity = 30 cp From the chart the flow rate is 800 gpm, the motor pressure drop is 200 psi, and the WOB to off set the motor pressure thrust is about 6,000 lbs.

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HWK 9 solution-1 - PGE 430 HWK 9 Solution Due in lecture...

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