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An = nozzle area in sq/in. At this point, we are now ready to give the final equation for calculation of the bit nozzle pressure drop. This is given by the following equation: P = 1120. where: P = pressure drop @ the bit (psi) MW = mud weight (ppg) Vn = velocity of the fluid in ft/min through the bit. 2. Annular Pressure Losses ................
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