深锤电潜泵基础知识（英文）.ppt

1、Centrilift Basics,A guide to Centrilift ESP Systems,Centrilift, The System,Consistently set the industry standard All the technology to provide the complete system With the system approach to technology, we are better able to control the quality and reliability of products and services,Downhole Cent

2、rifugal Pump,Is so named because head added to fluid is due largely to centrifugal effects Downhole pumps are characterized by: Small diameter Large quantity of stages High design loads,DownholeCentrifugal Pump,Is normally driven by a two-pole submersible motor at typical operating speeds of approxi

3、mately 3,600 rpm,Downhole Centrifugal Pump,May be driven at other speeds either due to power source or intentionally to modify performance Flow = ( rpm) = ( frequency ) Head = ( rpm2 ) = ( frequency2 ) Power = ( rpm3 ) = ( frequency3 ),Pump Stage,Works by transferring energy provided by driver to fl

4、uid to be moved,Gas Handling,Gas Separation,Used in applications where free gas causes interference with pump performance Separate some of free gas from fluid stream entering pump to improve pumps performance Gas separator methods include: Wellbore shrouding Reverse flow intakes Centrifuge separator

5、s,Specially designed rotating chamber acts as a centrifuge Forces heavier fluid to outside and allows free gas to migrate to center of chamber Two streams are physically separated at top Liquid rich stream is ported internally to pump inlet Gas rich stream is vented to casing annulus,Rotary Gas Sepa

6、rator,Seal Section,Is located between pump and motor Main function is to protect motor,Seal Section,Protects motor from contamination by well fluid Absorbs thrust from pump Equalizes pressure between wellbore and motor,Seal Section,Equalizes pressure and prevents well fluid from entering motor by us

7、ing: Mechanical seals A bladder system A labyrinth system,Submersible Motor,Is oil filled Is a two-pole, three-phase, 3600 RPM design Motor components designed to withstand 500oF temperatures,Submersible Motor,Motor cooling is achieved by: Internal oil circulation Flow of well fluid along outside sk

8、in,Variable Speed Drive,Simple to operate Multiple functions Most widely used for oilfield application Available in Nema I or III Enclosures,Pump failures in abrasive environments are caused by: 1. Excessive radial bearing wear especially critical in top and bottom of pump where resulting vibration

9、is transferred to the mechanical seals or between coupled units loss of radial support 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

10、 field data demonstrates this failure mode is a close second to radial bearing failure 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 environments,Pump

11、Abrasive Wear,ARM Pump Line,AR Coated Stages,Centrilift also use “Pumpguard” coating (polymer) on stages to improve stage wear characteristics and increase run life A “Pumpguard I” coating would typically be used with abrasives, in conjunction with AR bearings. A “Pumpguard II” coating would be used

12、 for applications with scale and asphaltene problems and would not necessarily require AR bearings Centrilift are also testing new coatings for continual improvement,ESP,ESPCP,ESPCP System,Through Tubing Conveyed Deployment Sequence,The ESPCP “Reduces Customer Cost”,Reduced power requirements over E

13、SP, especially with heavy, viscose fluid No emulsion creation, as with ESP & Jet Pump Through Tubing Conveyed ESPCP reduces workover costs Maximizes runlife of Permanent downhole equipment Allows Back Flush Capabilities by Reversing Motor,Electrocoil systems,Mark II-B Coiled tubing deployed ESP Powe

14、r cable inside the CT Annular/Liner production Inverted ESP configuration,Mark II-B System (Inverted ESP),Downhole Oil/Water Separation “SubSep”,Separates oil/water downhole Produces oil rich stream to surface Injects vast majority of produced water (85-95%) into a disposal zone Oil carryover of 500

15、ppm or less,SubSep Economic Drivers,DOWS economics based on ability to accelerate and maximize production from a given well/field Generally, accelerated oil production provides primary incentive Water handling cost definition is important Generally, reduction in Opex, water handling and lifting expe

16、nses is secondary incentive,Down-hole Water Sink Introduction,A new completion methodology to mitigate water coning Conventionally, operators perforate high in the oil column to stay away from water DWS completions rely on additional production perforations (in the water column) to create an offsett

17、ing pressure drop to suppress coning,Down Hole Water Sink,DWS Completion for In-situ Re-injection,HPump Product RangeDecksaver Plus,Vertically mounted, surface pumping system for use in limited space environments. Two pump, or four pump integrated design. Single Decksaver system using 40 square feet, can replace