esp design & analysis with pressure gradienta
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8/16/2019 ESP Design & Analysis With Pressure GradientA
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S ch l um b
er g er P r i v a t e
Electric Submersible
Pumps – design withpressure gradient curves
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S ch l um b
er g er P r i v a t e
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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S ch l um b
er g er P r i v a t e
Pressure gradient curve
PR
Pw
P!P P"PPump
dP
Pw
h
Pump settingdepth
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S ch l um b
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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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S ch l um b
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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 ch l um b
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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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S ch l um b er g er P r i v a t e
ESP diagnostics e,amples
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S ch l um b er g er P r i v a t e
ESP "iagnostic E,amples
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S ch l um b er g er P r i v a t e
ESP diagnostics and Time sliceanal#sis