Power Requirements rev7b

Power Requirements rev7b - Power Requirements 21-Jan-03...

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daeb162eed0cfb95b4242ced4214029170e2afe3.xls 10/31/2011 Page 1 Power Requirements 21-Jan-03 Assumptions Calculations Water Depth 13,100 ft Water Density 8.55 lb/gal Mud Density 12.5 lb/gal = 12.5 lb/gal Circulation Rate 1,200 gal/min = 8.55 lb/gal = 13,100 ft Mud Plastic Viscosity 20.0 cp Mud Yield Point 12 = 2,691 psi Return Riser Pipe 7.0 in Riser Pipe Friction Pressure 500 psi = 500 psi Efficiency of Mudlift Pump 80% = 3,191 psi Efficiency of Hydraulic Pump 90% Efficiency of Electric Motor 90% Contingency 20% = 2,234 HP Efficiency = product of individual efficiencies = 64.8% Input Power at the Seafloor = HHP/Efficiency = 3,447 HP -electrical = 2,571 kW Contingency = 20.0% = 514 kW Electrical Power Required at the Seafloor = 3,085 kW P HYD = 0.052 ( ρ MUD - ρ WATER ) D WATER ρ MUD ρ WATER D WATER lbf/100ft 2 P HYD P FRICTION P MUDLIFT PUMP Mud Pump Hydraulic Power = q p / 1714

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daeb162eed0cfb95b4242ced4214029170e2afe3.xls 10/31/2011 Page 2 Bingham Plastic Model Assumptions Water Depth 13,100 ft Pressure Drop Inside Riser Pipe Mud Density 12.5 lb/gal Circulation Rate 1,200 gal/min Mud Plastic Viscosity 20.0 cp Mud Yield Point 12 Fluid Velocity: Return Riser Pipe 7.0 in q = 1,200 gal/min d = 7.0 in 506 psi so, v = 10.00 ft/sec 1,200 12.5 For Laminar Flow: 20.0 12.0 7.0 PV = 20.0 cp 8.55 YP = 12 d = 7.0 in L = 13,100 ft so, dp/dL = 0.0103 psi/ft and, 135 psi For Turbulent Flow: PV = 20.0 cp YP = 12 MW = 12.5 lb/gal d = 7.0 in L = 13,100 ft so, dp/dL = 0.0386 psi/ft and, 506 psi Max. 506 psi Reference: Applied Drilling Engineering by Bourgoyne, etc., p.155 lbf/100ft 2 p = μ = τ = lbf/100 ft 2 p = μ = τ = lbf/100 ft 2 ρ = p = p = 2 d 448 . 2 q v = d 225 d 500 , 1 v dL dp 2 τ + μ = 25 . 1 25 . 0 75 . 1 75 . 0 800 , 1 d v dL dp μ ρ =
daeb162eed0cfb95b4242ced4214029170e2afe3.xls 10/31/2011 Page 3 5" DP Tensile Force (kip) 8.6 10.5 12.5 8.6 10.5 12.5 ppg ppg ppg ppg ppg ppg ID (in) 3,281 131 18 113 21 26 31 134 139 143 4.276 4,921 197 28 169 32 39 46 201 208 215 6,562 262 37 226 42 51 61 268 277 287 Area (in^2) 8,202 328 46 282 53 64 76 335 346 359 14.360 9,842 394 55 339 63 77 92 402 416 430 11,483 459 64 395 74 90 107 469 485 502 Pipe Weight = 40 lb/ft 13,123 525 73 451 84 103 122 536 554 574 Buoyancy Factor = 0.86 5 7/8" DP Water Weight Total Tensile Force 8.6 10.5 12.5 8.6 10.5 12.5 ft kip kip kip kip kip kip kip kip kip ID (in) 3,281 131 18 113 31 37 44 143 150 157 5.153 4,921 197 28 169 46 56 67 215 225 236 6,562 262 37 226 61 75 89 287 300 315 Area (in^2) 8,202 328 46 282 76 93 111 359 375 393 20.855 9,842 394 55 339 92 112 133 430 451 472 11,483 459 64 395 107 131 156 502 526 551 Pipe Weight = 40 lb/ft 13,123 525 73 451 122 149 178 574 601 629 Buoyancy Factor = 0.86 6" 26-lb Casing Water Weight Total Tensile Force 8.6 10.5 12.5 8.6 10.5 12.5 ft kip kip kip kip kip kip kip kip kip ID (in) 3,281 131 18 113 30 37 44 143 150 157 5.132 4,921 197 28 169 45 56 66 215 225 235 6,562 262 37 226 61 74 88 286 300 314

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This note was uploaded on 10/30/2011 for the course PETROLEUM 689 taught by Professor Jeromej.schubert during the Fall '11 term at Texas A&M University-Galveston.

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Power Requirements rev7b - Power Requirements 21-Jan-03...

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