Electrical Submersible Pump (E.S.P)

Electrical Submersible Pump


Is an artificial lift method where the subsurface pump will operate with an electric power transmitted 
"from a surface to the subsurface via a cable "power cable



Tubing Suspended

Is tubing suspended pump inside the casing and discharge through tubing

It consists of

Surface equipment

Transformer


"Switchboard"motor controller


"Junction box "vent box


Surface cable "which transmitted the power from surface to  subsurface

"Subsurface equipment" from bottom&up

Motor

"Protector" seal section


Pump intake

Subsurface pump


Check valve


Drain valve


power cable

Consist of two type

"Flat cable...." to prevent stuck

"Roller....." has higher resistance

يتم التوصيل بين two parts بواسطه Splice

Operating Mechanism

The available primary voltage is transmitted to

three single phase transformer to convert the high voltage to lower voltage
one-three phase transformer to convert the low primary voltage to a higher one

then the power passes through the switchboard which allow the current to pass if it's on ON position

then the current will pass through the surface cable, vent box, well 
head, and down in the well until the motor

the motor will rotate which allows the pump rotation because they are coupled with each other rotation of pump will discharge the produced fluid through the discharge head to fill up the tubing then start producing on the surface

a check valve is located above the pump in order to



Keep the tubing full off during a shutdown 

Prevent the produced volume from falling back on the pump which may be cause rotation of the pump on the opposite direction which resulting in bearing failure


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Drain valve



  Is used to get the tubing empty during pulling out of 
(the hole( POH

located below the check valve

 motor section the motor used with the electrical submersible pump is

There phase

Self-priming

Self-lubricating

Const speed

Induction motor

   Frequency 50 HZ

Speed 2415 R.P.M

the motor is full of very high qualified lube oil which absorb the heat generated during motor rotation transfers it to the motor housing which should be cooled by the produced fluid

therefor the pump should be placed above the perforations

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seal section



The function of protector

 Protection motor lube oil against the invasion by the formation fluid

Connect the pump housing with the motor housing through coupling the motor shaft with the bottom of the protector shaft&pump shaft with the top of the protector shaft

Used as a reservoir for the motor lube oil resulting from expansion during motor rotation &provides lube oil to the motor during the 
"motor shut down"cooling of the oil

Houses the thrust bearing of the pump

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pump intake

Is the pump inlet where the produced fluid to enter into the pump

 (in some cases (especially when the GOR is high 

a bottom hole gas separator is used to separate the gas and divert it int annulus

the gas separator is also used as a pump intake 

************************
subsurface pump

 the subsurface pump used (self-priming, multistage, centrifugal
( pump

It consists of more than one stage .each stage consist of a rotating 
"part called "impeller
"mounted on the shaft and stationary part called "diffuser
 the production rate doesn't change from stage to another and mainly depend on the "shape, diameter 
"of the impeller while the head depends on the NO of stage

***********************

vent(junction)box

Is used to vent any gases which may travel with the cable to reach the switchboard in order to avoid the hazard of explosion or fire


therefore, the vent box should be located 35 feet as a minimum from switchboard and 15 feet as a minimum from the wellhead


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cables

There are two type of cable

round

flat

"The joint between them called"splice

each cable contains 3 conductors made of copper or aluminum

each conductor is surrounded by an insulation made of rubber&plastics followed by a jacket which protected by an armor made of bronze or steel




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