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    ESP Run Life Prediction

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    azareiforoush
    Continuous monitoring of ESP insulation resistance using ACE ESP sensors can help predict and extend ESP run life. The ACE sensor uses a true measurement technique by applying a reverse DC voltage and measuring the current to determine insulation resistance. Other brands measure current leakage, which is not accurate due to measurement errors between surface and downhole equipment from temperature changes, noise, and more. An insulation resistance trend from an ACE sensor showed a healthy initial reading that declined over 157 days before an ESP failure, allowing operators to take steps to prolong run life.

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    ESP Run Life Prediction

    Uploaded by

    azareiforoush
    71 views1 page
    Continuous monitoring of ESP insulation resistance using ACE ESP sensors can help predict and extend ESP run life. The ACE sensor uses a true measurement technique by applying a reverse DC voltage and measuring the current to determine insulation resistance. Other brands measure current leakage, which is not accurate due to measurement errors between surface and downhole equipment from temperature changes, noise, and more. An insulation resistance trend from an ACE sensor showed a healthy initial reading that declined over 157 days before an ESP failure, allowing operators to take steps to prolong run life.

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    ESP run life prediction

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    ESP run life prediction

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    Continuous monitoring of ESP insulation resistance using ACE ESP sensors can help predict and extend ESP run life. The ACE sensor uses a true measurement technique by applying a reverse DC voltage and measuring the current to determine insulation resistance. Other brands measure current leakage, which is not accurate due to measurement errors between surface and downhole equipment from temperature changes, noise, and more. An insulation resistance trend from an ACE sensor showed a healthy initial reading that declined over 157 days before an ESP failure, allowing operators to take steps to prolong run life.

    Copyright:

    © All Rights Reserved
    Download as PDF, TXT or read online from Scribd
    Download as pdf or txt
    71 views1 page

    ESP Run Life Prediction

    Uploaded by

    azareiforoush
    Continuous monitoring of ESP insulation resistance using ACE ESP sensors can help predict and extend ESP run life. The ACE sensor uses a true measurement technique by applying a reverse DC voltage and measuring the current to determine insulation resistance. Other brands measure current leakage, which is not accurate due to measurement errors between surface and downhole equipment from temperature changes, noise, and more. An insulation resistance trend from an ACE sensor showed a healthy initial reading that declined over 157 days before an ESP failure, allowing operators to take steps to prolong run life.

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    © All Rights Reserved
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    Continuous ESP insulation resistance monitoring using ACE ESP sensors will

    help predict and extend ESP run life.


    ACE ESP downhole sensor uses continuous ESP insulation resistance measurement
    technique to predict and extend ESP run life. It is a true measurement technique to arrive at the
    insulation resistance reading; providing a reverse DC Voltage and measuring the current to arrive
    at the resistance.
    Other brands of ESP sensors use current leakage, which is not a true measurement
    technique. Rather they measure the current supplied by the surface read out unit and compare it to
    current measured downhole by the sensor, and assume the difference is current leakage.
    Unfortunately, this is not an accurate measurement, since there are so many measurement
    inaccuracies between the surface and downhole equipment, due to downhole temperature changes,
    induced noise from VSD’s and motor cables introducing more errors.
    Some ESP sensors can only take a current leakage reading during the power-up, so
    although the display may show a reading shortly after power-up, the same reading will still be on
    the display months or years later. The measurement cannot be taken again so even if the cable has
    been shorted for months the incorrect reading is still displayed.
    These flaws render current leakage measurement useless for ESP performance analysis.
    ESP insulation resistance, on the other hand, gives a reliable trend for ESP run life predication.
    Figure 1 below shows insulation resistance trend. On the day of the first ESP start-up the
    insulation resistance measurement from ACE ESP sensor showed 10.234 MOhms, which
    indicates a healthy ESP system. There was very little change in insulation resistance over the next
    157 days of ESP operation. Finally, the trend showed a steep decline and on day 157 insulation
    resistance reading was half the value of the one at the ESP start-up. It is an indication that ESP
    electric system is weakening and the operator needs to prepare for an ESP failure. At this point, it
    is recommended to slow down VSD in order to lower Voltage and harmonics in the system to
    prolong ESP run life. It is also recommended to adjust VSD control set points such that unwanted
    ESP shutdowns and re-starts are avoided.
    A sharp drop in insulation resistance from MOhms to kOhms on day 164 indicates an
    imminent ESP failure within a few days.

    Figure 1.
    ESP insulation resistance trend. Measurements taken automatically by ACE ESP sensor over 165
    days
    Resistance,
    Days
    MOhm
    1 10.234
    2 10.215
    3 10.215
    149 10.188
    150 10.123
    151 9.85
    152 9.5
    153 8.8
    154 7.5
    155 6.8
    156 6.8
    157 6.8
    158 5.3
    159 4.5
    160 3.8
    161 2.3
    162 1.8
    163 1.5
    164 0.76
    165 0.22

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