• Tuesday, April 14, 2015

    Electrical Submersible Pump (E.S.P)

    Electrical Submersible Pump


    Is an artifacial lift method where the subsurface pump will operate with an electric power transmited 
    "from surface to the subsurface via acable "power cable



    Tubing Suspended

    Is atubing suspended pump inside the casing and discharge through tubing

    It consists of

    Surface equipment

    Transformer


    "Switch board"motor controller


    "Junction box "vent box


    Surface cable "which transimitte 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 avialable primary voltage is transmitted to

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

    then the power passes through the switch board which allow the current to pass if its on ON position

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

    check valve is located above the pump in order to



    Keep the tubing full off during shutdown 

    Prevent the produced volum from falling back on the pump which may be cause rotation of the pump on the oppist 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 electrical submersible pump are

    There phase

    Self priming

    Self lubricating

    Const speed

    Induction motor

       Frequency 50 HZ

    Speed 2415 R.P.M

    the motor is full of arery 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 luble oil against the invasion by the formation fluid

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

    Used as areservoir for the motor luble oil resulting from expansion during motor rotation &provides luble 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 enter into the pump

     (in some cases (especially when the GOR is high 

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

    the gas separator is also used as apump intake 

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

     subsurface pump used as (self priming,multistage,centrifugal
    ( pump

    It consists of more than one stage .each stage consist of arotating 
    "part called "impeller
    "mounted on the shaft and stationary part called "diffuser
     the production rate doesnt 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 switch board in order to avoid hazard of explosion or fire


    therfor,the vent box should be located 35 feet as minimum from switch board and 15 feet as minimum from the well head


    *********************
    cables

    There are two type of cable

    round

    flat

    "The joint between them called"splice

    each cable contains 3 conductor made of cupper or aluminium

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