深锤电潜泵基础知识(英文).ppt

1、Centrilift Basics A guide to Centrilift ESP SystemsCentrilift,The SystemConsistently set the industry standardAll the technology to provide the complete systemWith the system approach to technology,we are better able to control the quality and reliability of products and servicesDownhole Centrifugal

2、 PumpIs so named because head added to fluid is due largely to centrifugal effectsDownhole pumps are characterized by:Small diameterLarge quantity of stagesHigh design loadsDownholeCentrifugal PumpIs normally driven by a two-pole submersible motor at typical operating speeds of approximately 3,600 r

3、pmDownhole Centrifugal PumpMay be driven at other speeds either due to power source or intentionally to modify performanceFlow =(rpm)=(frequency)Head =(rpm2)=(frequency2)Power=(rpm3)=(frequency3)Pump StageWorks by transferring energy provided by driver to fluid to be movedGas HandlingGas SeparationU

4、sed in applications where free gas causes interference with pump performanceSeparate some of free gas from fluid stream entering pump to improve pumps performanceGas separator methods include:Wellbore shroudingReverse flow intakesCentrifuge separatorsSpecially designed rotating chamber acts as a cen

5、trifugeForces heavier fluid to outside and allows free gas to migrate to center of chamberTwo streams are physically separated at topLiquid rich stream is ported internally to pump inletGas rich stream is vented to casing annulusRotary Gas SeparatorSeal SectionIs located between pump and motorMain f

6、unction is to protect motorSeal SectionProtects motor from contamination by well fluidAbsorbs thrust from pumpEqualizes pressure between wellbore and motor Seal SectionEqualizes pressure and prevents well fluid from entering motor by using:Mechanical seals A bladder systemA labyrinth system Submersi

7、ble MotorIs oil filledIs a two-pole,three-phase,3600 RPM designMotor components designed to withstand 500oF temperaturesSubmersible MotorMotor cooling is achieved by:Internal oil circulationFlow of well fluid along outside skinVariable Speed DriveSimple to operateMultiple functionsMost widely used f

8、or oilfield applicationAvailable in Nema I or III EnclosuresPump failures in abrasive environments are caused by:1.Excessive radial bearing wear especially critical in top and bottom of pump where resulting vibration is transferred to the mechanical seals or between coupled units loss of radial supp

9、ort throughout pump results in vibration and operational instability 2.Excessive stage downthrust wear can cut through impeller shroud,causing hydraulic performance degradation and can block flow passageways lab and field data demonstrates this failure mode is a close second to radial bearing failur

10、e 3.Erosive wear in flow passageways hydraulic performance slowly degrades over time longer term failure mode than downthrust and radial bearing failure generally only observed in highly abrasive environmentsPump Abrasive WearARM Pump Line11Module consists of standard stages located in intermediate

11、positions above an AR stage.Thrust is transferred to the AR insert set through adjacent impeller hubs within the module.Patented design provides enhanced downthrust and radial support wear protection in every module2233A premium pump line for mild to aggressive well conditions that gives enhanced ra

12、dial and thrust wear protection.AR Coated StagesCentrilift also use“Pumpguard”coating(polymer)on stages to improve stage wear characteristics and increase run lifeA“Pumpguard I”coating would typically be used with abrasives,in conjunction with AR bearings.A“Pumpguard II”coating would be used for app

13、lications with scale and asphaltene problems and would not necessarily require AR bearingsCentrilift are also testing new coatings for continual improvementCentrilift MotorCentrilift SealCentrilift Cable ESPESPCPGear reducerFlexshaft assemblyESP PumpPC PumpESPCP SystemThrough Tubing Conveyed Deploym

14、ent SequenceMotorGear ReducerSealTubing CrossoverTubingCableLocatorFlexshaftPC PumpCentralizerPackoffAnchorThe ESPCP“Reduces Customer Cost”Reduced power requirements over ESP,especially with heavy,viscose fluidNo emulsion creation,as with ESP&Jet PumpThrough Tubing Conveyed ESPCP reduces workover co

15、stsMaximizes runlife of Permanent downhole equipment Allows Back Flush Capabilities by Reversing MotorElectrocoil systemsMark II-BCoiled tubing deployed ESPPower cable inside the CTAnnular/Liner production Inverted ESP configurationMark II-B System(Inverted ESP)ElectroCoil,CT w/Internal Power CableS

16、hear SubElectrical Penetrator Adaptor,High PressureThrust/Sealing AdapterPumpSeal SectionMotorIntake Stinger,PerforatedPacker w/Hydraulic Controlled SSSVCasing/LinerProduction PerforationsPump,DischargeSolids SkirtDownhole Oil/Water Separation“SubSep”Separates oil/water downholeProduces oil rich stream to surfaceInjects vast majority of produced water(85-95%)into a disposal zoneOil carryover of 500ppm or lessHydrocycloneTube InjectedWaterSealProd.ZoneInj.ZoneSepPMPSubSep Economic DriversDOWS eco