ESP Design & Analysis With Pressure GradientA

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Electric Submersible

Pumps – design withpressure gradient curves

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Flow

FlowFlow

Ground Level

Producing Fluid Level

Pump Set Depth

Wellhead

Net Vertical Lift1

2Total Friction

Loss

WellheadPressure

3

Total Dynamic Head – What I am not going to talk about !

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Pressure gradient curve

PR

Pw

P!P P"PPump

dP

Pw

h

Pump settingdepth

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Pump curves

• The two main pump design parameters are:

• The pump delta P converted to head byfuid density.

• The pump fow rate in rb/d

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Pump curves

Efficiency

Pump Range

Head

HP per Stage

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S#stematic Pressure $nal#sis

Above the pump:

P discharge = !P " ∆Pgravity " ∆P#riction $wellhead to pump%

&alidates : oil density' water cut' pressures and depths%

Across the pump:

P inta(e = Pdischarge ) ∆Ppump

here ∆Ppump = !ead $#t% * +ensity $psi/#t%

&alidates : pump per#ormance' fowrate' e,ect o#

wear/viscosity/gas%

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S#stematic Pressure $nal#sis

-elow the pump:

P w#  = P inta(e " ∆Pgravity " ∆P#riction $pump to reservoir%

n the reservoir:

P = / $P0  Pw#  % $reservoir infow per#ormance%

&alidates : P0' fowrate' P' P0

+ownhole fowrate $rb/d% = oil$stbo/d% * -o " water $stbw/d%

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ESP %ead&Pressure 'alculations

• 23P generates head by movement o# fuidsthrough the impeller and di,user changing(inetic energy $movement% into potential energy$head%

• !ead is dependent on

3peed o# rotation o# impeller

4low rate through the impeller

3i5e and shape o# impellers $fow types%

&iscosity o# fuids

Amount o# gas

6echanical #actors such as wear

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ESP %ead&Pressure 'alculations

• !ead $#t% = ∆Ppump $psi% / pressure gradient o# wellfuids $psi/#t%

•  remember pressure gradient $psi/#t% = 3.7. / 8.91

• uestions:

1.4or a pump generating 8;; #eet o# headand pumping seawater' what is ∆P <

8.4or the same pump which is nowpumping 9>AP oil what is ∆P <

9.hat would this scenario be typical o# <

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ESP %ead&Pressure 'alculations

• 4luid levelabove thepump

Flow

FlowFlow

Ground Level

Producing Fluid Level

Pump Set "epth

Wellhead

7iven : pump set depth = ?;;; #t' top o# per#orations =?@; #t' the measured Pinta(e  = ?;; psi and 5ero casing

pressure in the well producing 1;; 9>AP oil ' what isthe fuid level above the pump <

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ESP %ead&Pressure 'alculations

• 4or the case o# this well with no measurement o#Pinta(e but with ; water cut and a measured fuid

level= 9@B #t' what would be the Pw# <

(il ))

ProducedFluid

+ownhole measurement will reduceuncertainty

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*easurements or ESP s#stems

What+s measured What it can help with

Pump discharge pressure ater cut' tubing 7C0 estimationand well shut in protection

ell head pressure ater cut and tubing 7C0

Pump inta(e pressure 7as loc(ing $Pb and #ree gas

volumes%' reservoir drawdown' sandcontrol' coning

∆PpumpDpthrust and downthrust protectionEfow estimation' pump per#ormance$wear' viscosity'materials%

6otor temperature Cverheating

6otor amps Cverload/underload protection

Furrent lea(age Cverheating insulation brea(down

&ibration 4atigue' loading

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ESP diagnostics e,amples

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ESP "iagnostic E,amples

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ESP diagnostics and Time sliceanal#sis

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ESP diagnostics and Time sliceanal#sis