【正文】 and underneath the impeller shrouds Pump Thrust Load 65 The impeller discharge pressure is on the upper and lower impeller shrouds Pump Thrust Load 66 The larger cross sectional area on the upper shroud causes the force to be Down Pump Thrust Load This causes the impeller to be moved down This is a positive downward force termed ?Downthrust? 67 Pump Thrust Load At some point the volume of fluid going up into the pump will lift the impeller up, overing the Downthrust pressure This causes the impeller to be moved up 68 Pump Thrust Load The downward force is now reversed (negative), it is termed ?Upthrust? This causes the impeller to be moved up At some point the volume of fluid going up into the pump will lift the impeller up, overing the Downthrust pressure 69 Pump Thrust Load This increases the ?Upthrust? This causes the impeller to be held up This creates a larger cross sectional area on the bottom shroud which increases the pressure underneath 70 Hydraulic Thrust ? Total hydraulic thrust has two ponents, an up thrust ponent and a down thrust ponent ? The up thrust ponent is primarily created by the velocity through the impeller or hydraulic impact force ? The down thrust is primarily created by the pressure generated by the stage ? These two ponents bine to make up total hydraulic thrust ? Fluid viscosity has a dramatic affect on hydraulic thrust 71 Flow from Diffuser Impeller Flow Path Fluid velocity amp。 “absorbsion” ? aka “Equalizer”, “Protector”, or “Seal Section” 97 Motor Pump 98 Motor Pump 99 100 101 Motor Pump 102 Motor Seal Pump 103 C en tr ilif tLocated between the pump and motor Transfers the motor torque to the pump shaft The Seal Section 104 Labyrinth Chamber 105 Labyrinth Chamber 106 107 Double Labyrinth Chamber 108 109 110 111 Pump Motor Labyrinth Chamber 112 113 114 Pump Motor Bag or Bladder 115 Pump Motor 116 117 The Seal Chamber Section ? Is located between the pump and motor ? Transfers the motor torque to the pump shaft ? Isolates the well fluid from the clean motor oil ? Provides area for motor oil expansion volume 118 119 Labyrinth Chamber Motor Oil Heated 120 Labyrinth Chamber Motor Oil Cooling 121 Double Labyrinth Chamber Motor 122 Bag (or Bladder) Motor Motor Oil Heated 123 Bag (or Bladder) Motor Motor Oil Heated 124 Bag (or Bladder) Motor Motor Oil Heated Check valve 125 126 127 Bag (or Bladder) Motor Motor Oil Heated Check valve 128 Bag (or Bladder) Motor Motor Oil Heated Check valve 129 Bag (or Bladder) Motor Motor Oil Heated Check valve 130 Motor Motor Oil Cooling 131 Motor Motor Oil Cooling 132 Motor Motor Oil Heated Double Bags 133 Motor Motor Oil Heated Double Bags 134 Motor Motor Oil Heated Double Bags 135 136 137 Motor Motor Oil Heated Parallel Bags 138 Motor Motor Oil Heated Parallel Bags 139 The Seal Chamber Section ? Is located between the pump and motor ? Transfers the motor torque to the pump shaft ? Isolates the well fluid from the clean motor oil ? Provides area for motor oil expansion volume ? Equalizes the internal unit and wellbore pressure 140 Motor 141 ‘n’ thousand feet 142 143 144 145 The Seal Chamber Section ? Is located between the pump and motor ? Transfers the motor torque to the pump shaft ? Isolates the well fluid from the clean motor oil ? Equalizes the internal unit and wellbore pressure ? Provides area for motor oil expansion volume ? Absorbs the pump shaft thrust load 146 147 148 149 Compression, Fixed Impeller, Pumps 150 Compression, Fixed Impeller, Pumps 151 Motor Seal Pump 152 Seal (Lower Chamber) Motor 153 Heat Exchange Area Thrust Bearing Area Seal (Lower Chamber) Motor Thrust Runner Thrust Runner Carbon Face Bearing Bearing Retainer Screen Filter Upthrust Ring 154 Seal Unit Base 155 Bearing Retainer 156 Oil Pump 157 Bearing 158 Carbon Face 159 Thrust Runner 160 Thrust Runner Carbon Face Thrust Runner 161 Upthrust Bearing 162 Upthrust Bearing Bearing Runner 163 164 Bearing Assembly Complete 165 166 The Seal Chamber Section ? Is located between the pump and motor ? Transfers the motor torque to the pump shaft ? Isolates the well fluid from the clean motor oil ? Equalizes the internal unit and wellbore pressure ? Provides area for motor oil expansion volume ? Absorbs the pump shaft thrust load 167 Seal Section Components review Major ponents are ... ? Mechanical Seals prevents fluid migration down the seal shaft ? Bag(s) or Bladder(s) provides expansion volume and isolation for clean motor oil ? Labyrinth Chamber(s) provides expansion and isolation volume in vertical or near vertical wells ? Thrust Bearing carries the thrust load of the pump shaft and stages (fixed impeller type only) 168 Seal Section Application ? Use tandem seals in high pulling cost wells – Seals are relatively low cost items as pared w/the total unit cost – The more seal sections, the more mechanical seals and therefore, increased shaft isolation – Can be designed as a “Thrust on Lower” (TOL) which gives added protection to the unit thrust bearing ? Use single or multiple bag seals in highly deviated wells – The isolation capability of a labyrinth chamber is greatly reduced in deviations beyond 30 45 degrees from v