7. Diseño de ESP

7/28/2019 7. Diseo de ESP

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EX 7. 1Example 7

FloSystem User Course

ESP Design and Analysis


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EX 7. 2

ESP Design andAnalysis Modes

Design Mode

Entering a Setting depth, max. OD, Op. frequency,Wear factors and Efficiency.

A selection of the Pump/Motor is made

Selection is made from a internal database of fivemanufacturers data

Analys is Mode

The Pump/Motor (ESP) has been selected

Performance of the ESP can be analysed runningsensitivities :

Pump variables e.g. Operating Frequency

Reservoir parameters e.g. Water cut


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EX 7. 3ESP Design Mode

Open ESP.WFL - Review Reservoir, Deviat ion , andEquipment Data

The completion string contains an ESP at thebottom of the tubing (i.e. 14632 ft)

Select Data Preparat ion -ESP Data...

Revise the Pump Envi ronment box :

Note the Measured depth is the pump depth

OD and ID are chosen considering the casing ID

Operating frequency is a typical value

Upstream temperature used only in manual modecalculations (leave as default)


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EX 7. 5

ESP Data... :Design Mode only

Revise the values ofWear factors /Eff ic ienc ybox

Note the wear factor are set to 1 for the pump andmotor (i.e. no wear assumed)

The efficiency of the gas separator is 100% i.e. no freegas through the pump

Revise the Calculations options box

The viscosity and gassiness are switched on

The Analys is equipmentbox can not be editedin this mode


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EX 7. 6ESP Design... :


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EX 7. 7

ESP Design Rate :Liq. = 450 stb/day

Select Analysis -Operating Point...

Select Calculate, Results and Plo t

Note Operating Pressure = 3547 psia and Liquid

rate = 110 stb/day (very low for this well) Select Analysis - Pressu re Drop

select Edit Rates... and set the design rate of 450stb/day. Select calculate, results and plot

note that the pressure at pump depth is 3226 psia

Select Analysis -ESP Design...

Note the Design l iquid rateis set at 450 stb/day

Verify with Cho ose ESP... that the list is empty

Revise the Correlations... options


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EX 7. 8ESP Design... Box

Select Calculateand then Choose ESP...


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EX 7. 9

ESP Design:Choose Pump

Revise the suitable list of Pump - Motor

Choose Pump T4-500, motor T5 Series frommanufacturer ESP Inc. and Cable #2

Select Plottoobtain the ESP performance


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EX 7. 10

ESP Pump Performance


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EX 7. 11

ESP OptimisationPump Performance

Select Optimise.. . to optimise the configuration interms of

Frequency,

Number of stages or

Three performance criteria (minimum, maximumflowrate, or most efficient operating point)

Cable size power

losses will be included

in the Electrical Powerresults


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EX 7. 12


Frequency: design calculations repeated to obtainoptimum number of stages and flowrate

Number of Stages: the new operating frequency isestimated by reiteration (equations not shown)

Performance: the operating frequency andnumber of stages are computed by iteration suchthat the operating rate (P and T from mid-point ofpump depth) corresponds to the minimum,maximum or best efficiency value


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EX 7. 13


As exercise optimise using the followingparameters:

70 Hz

reduce the number of stages to 103

change the performance to best efficiency

Review the impact of these changes on otherdesign parameters


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EX 7. 14

ESP DesignInstall...


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EX 7. 15ESP Analysis Mode

Note that the switch Design mode onlyis switchedoff indicating that the Analysis modeis on

The Analys is equipmentbox is now editable anddisplays the pump and motor parameters installed

Select OK if satisfied with pump selected.

Select Analys is - Operat ing Point (Edi t rates -Fi l l )

Note that the new Operating Pressure is 3240 psia and theliquid rate is 451 stb/day.

Select Analysis - Pressure Drop Note that the intake pressure is 2332 psia and the

discharge pressure is 3240 psia at 14632 ft.


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EX 7. 16

ESP Analysis


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EX 7. 17

ESP Analysis:Sensitivity Studies

Once optimum parameters: Setting depth, Tubingsize, FHTP and a Pump/Motor has been selected

Check sensitivity to

Changing Reservoir Pressure

Increasing watercut

Check Sensitivity to

Increase no of stages to increase flexibility if required

Operating frequency


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EX 7. 18

ESP Analysis: Op.Frequency (VFD)

Return to Analysis - Operat ing Pointand selectSensit ivi t ies.. .

Note that Sensitivity 2 is set to Operatingfrequency with values: 30, 45, 60, 75 and 90 Hz


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EX 7. 19

ESP VFD Sensitivity


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EX 7. 20ESP VFD Sensitivity

minimum rate

maximum rate

best efficiency

rate


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EX 7. 21

ESP Analysis :WaterCut Sensitivity

Return to Analysis - Operat ing pointand selectSensit ivi t ies.. .

Note that sensitivity one is set to water cut withvalues : 0, 25, 50, 75, 99 %


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EX 7. 22

ESP Analysis :WaterCut sensitivity

0 % Water cut

99% Water cut


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EX 7. 23

ESP & SimulationVFP Tables

After all sensitivity runs have been done selectAnalysis - Expor t VFP fi le... to input VFP tablesto a simulator. Following are typicalrequirements:

Rate FTHP w.c. GOR Frequencyb/d psia frac MSc/bbl Hz100 50 0.0 0.49 30

200 100 0.1 45

300 200 0.25 60

500 300 0.5 75750 500 0.75 90

1000 750 0.99

6 x 6 x 6 x 1 x 5 = 1080 runs


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EX 7. 24

ESP Design:Manual Intervention

Manual Calculations required for :

Packer Selection

Protector Design

Tubing Stresses

Junction Box, transformers, switchboard

7. Diseño de ESP

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