| It has been 80 years since the invention and application of electricsubmersible pump (ESP). In nowadays' Petro- industry, along with therising of the shares of mechanical-lifting oil well, numbers of the ESPwell are growing faster. Today, oil fields worldwide are passing theirmiddle-life and getting graying. Oil fields extend to deserts, seas orother extreme environment areas increasingly. Should ESP system haveadvantages of high adaptability and reliability when it comes to thequestions that more complex the geological structure, deeper well depthand higher cost of operation & ESP installation within a well. Therefore,it requires ESP system to be more wearable, anti-erosive andanti-vibration; on the other hand, a high-rank-isolation electricsubmersible motor with a more extended variability of speed and powerbased on advantage technologies such as frequency-conversion-control isneeded.In this paper, the structure and principle of an electric submersible pump(ESP) system are introduced. A high-power (upper 200kw) ESP system- 562series is described, including structure and manufacture designing andtesting process. The structure and principle of the main parts of 562series such as electric submersible motor, seal section (protector),centrifugal pump are discussed. Pumping efficiency characteristics,proportion laws, proportion revolution and pumping trait curves underviscosity effect are mentioned. A brief of designing percept and sampletesting is presented. Also some details such as electric submersible motorepoxy dielectric process procedure design, implementation, designing ofa testing device for the protector's thrust bearing, etc. are given.Testing data are analyzed and concluded.Finally, along with questions emerged in field-applications, theperforming traits of the 562 series are analyzed and concluded. Measuresto improve the system's reliability and stability are recommended.
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