1-2电潜泵系统构及工作原理.ppt

电潜泵知识与控制理论培训 湛江 Introduction xxx A typical ESP installation ESP System Technology Overview Objective Upon comletion of this course, you should be able to: Explain the uses for Electrical Submersible Pumps. List the major components of an ESP system. Explain the principle of an ESP system. ESP Downhole System The basic ESP downhole system components are ... The Pump Hangs from the production tubing Lifts the fluid through the tubing to the surface Is a multi-stage centrifugal type Is constructed from impellers and diffusers Must be sized to match the well production Has an intake and discharge that either bolts onto or is threaded into the pump housing Normally be set above the perforation for sufficient cooling. Centrifugal ???? Pump Stage Hydraulic Design ESP Stage designs fall into one of two hydraulic design categories … Impeller Terminology Total Dynamic Head ( TDH ) Use the pump curve to size a pump We have a well, we want to produce 600BPD, and we need at least 280ft pump head. How many stages do we need? Pump Performance Pump stage performance has three measured parameters which are… Flow Rate Head (Discharge pressure can be calculated) Brake Horsepower or Motor Load From the above, Pump Efficiency may be calculated Using the pump curve Example: A well will produce 4000 BPD with a GC3500 pump when the pump produces a TDH (total dynamic head) of 5000 ft. Specific gravity of the produced fluid = 1.00 How many stages we need? How big the motor should be? Pump Curve Using the pump curve Pump Thrust Impeller Position In Floating Impeller Pumps the Impeller does not ‘Float’ Forces acting on the Impeller… Under normal operating conditions, fluid circulates on top and underneath the impeller shrouds The impeller discharge pressure is on the upper and lower impeller shrouds The larger cross sectional area on the upper shroud causes the net force to be Down At some point the volume of fluid going up into the pump will lift the impeller up,