电潜泵运行过程中所监测的参数.ppt
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1、ESP Operating Parameters,ESP Operation,Once an ESP system is commissioned, the operator plays a key role in the systems performance and run lifeKey parameters must be monitored to insure proper operation of the systemFailure to properly monitor or interpret these parameters can be costly,Operating P
2、arameters,Three basic ESP operating parameters are Gross Production RatePump Intake PressureOperating Motor CurrentBy monitoring these parameters, an Operator can better determine the relative condition of an ESP or anticipate possible problems,Flow Rate,Production Rate,By monitoring the production
3、rate an operator can Determine the approximate operating point on the pump curveTrend the rate of declining productionLook for possible pump wear, tubing leaks, etc.Loss of production is usually the first indicator of a downhole problem with an ESP,Pump Intake Pressure,By monitoring PIP, an Operator
4、 can . Determine relative unit sizing accuracy by comparing with the computer sizingAnticipate unit cyclingLook for tubing leak, pump plugging and/or wearIncreases or decreases in PIP can indicate a change in the pump performance, well inflow, or installation integrity,Motor Current,By monitoring mo
5、tor current, an Operator can . Look for trends in unit loadingSpot possible motor damage due to electrical or mechanical problemsDetermine relative pump load or spot changes in loadingDetect changes in downhole fluid conditionChanges in operating current indicate that the motor is reacting to a new
6、input from the pump, well, or electrical system. The Motor Controller should shut the unit off if the current varies beyond acceptable limits,Amp Charts,Amp charts are a valuable troubleshooting toolAmp charts record the motor current over timeTrends in motor loading can be analyzed along with other
7、 unit dataCertain downhole conditions give unique current signatures,Normal Chart,A.May produce a curve that is below or above motor nameplate amperageB.Curve should be smooth and symmetricalC.Spike on startup is a normal occurrence on “across the line” starts,Pump Off,A. Starting Current SpikeB. No
8、rmal Running AmpsC. Pump Off BeginsD. Unit Hits Underload Amps & Shuts Down,Pump Off Effects,Production will be lower than anticipated Lower fluid velocity past the motorHigher than normal motor operating temperatureExcessive restarts of the unitMechanical stresses to unit shaftsElectrical stresses
9、to cable and motor insulation system,Pump Off Causes & Solutions,CauseUnit flow capacity is too large for the wellPerforations are restrictedWell inflow performance has changedUnit was sized for future conditions,SolutionLower flow w/a surface choke or reduce operating HzChemical treatmentResize the
10、 unit, choke it back, or reduce operating HzChoke it back or reduce operating Hz,Gassy Conditions,A.Current inrush on “across the line” startupB.Decreased gas %, increased density, (increased amps) increased pressure, increased flow, increased inlet velocity and increased gas %C.Too much gas, low de
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