Electrical Submersible Pump (E.S.P)

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


    "Switchboard"motor controller

    "Junction box "vent box

    Surface cable "which transmitted the power from surface to  subsurface

    "Subsurface equipment" from bottom&up


    "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


    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



    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

    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


    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



    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


    There are two type of cable



    "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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