• Class and Course

    Advanced Production Logging

    This course covers all the available production logging tools offered by the various vendors. The course covers in details production evaluations in single-phase, two-phase and three-phase environments. Strong focus and emphasis on production logging in horizontal wells.

    This is a 5 day course aimed at personnel with a solid grounding and some experience in production logging. These candidates should have attended the cased hole production logging and reservoir monitoring course.


    Day 1

     Day 1

    • Why Run Production Logs? Overview:

      • Outline of the various processes used.
      • Determine Productivity Index (PI) of oil wells and the injectivity of water wells, zone by zone.
      • 2 Phase flow rates: Water/Oil, Oil/Gas, Water/Gas.
      • Three Phase Flow
      • Interzone crossflow
    • Production Performance of oil and gas wells:
      • Productivity Index (PI) of oil wells.
      • Absolute Open Flow (AOF) Potential in gas wells.
      • Depth Control in Cased Hole.
      • Well Completions and its effects on Production Logging:
      • Open Hole completions, Casing, Liners, Gravel Pack
      • Flow regimes in vertical, deviated and horizontal wells:
      • Unpredictable changes in the flow regimes.
      • Flow regimes effects on the 3-phase flow.

     1-hour Workshop: Production Performance and skin effects

    Day 2

    Day 2

    • Equations applied in multi-phase flow regimes:
      • Conservation of momentum equation to define the spinner velocity.
      • Reynolds Number.
      • Unit integrations to compute production.
    • Slippage velocities: theory and empirical charts applications.
    • Various techniques to measure fluid velocities- A wide range of applications:
      • Spinners: inline spinner, full bore spinner and micro-spinner.
      • Oxygen activation to measure water velocity.
      • Radioactive tracer to measure oil and water velocities.
      • Phase velocity log to measure using gadolinium to measure oil and water velocities.
      • Gas bubble velocity from the optical sensor (GHOST).
    • Spinner Threshold (Vth); definition and measurement:
      • Measuring Vth in stationary fluid.
      • Measuring Vth under flowing conditions.
      • Measuring Vth in horizontal wells.
      • Vth application to detect leaks.

    1-hour Workshop: Spinner Calibrations.

    Day 3

    Day 3

    • Holdup measurements in 3 phase flows: Various tools and their applications
      • Borehole differential pressure.
      • Capacitance: measuring of fluid dielectric.
      • Electric sensors (Flowview).
      • Optical sensors (Ghost).
    • Temperature Logging Tools and their applications under shut-in and flowing conditions.
      • Temperature signatures.
      • Temperature data base application.
      • Signatures in Lost circulation zones.
      • Temperature modelling used to estimate flowrates in oil and water producing zones.
    • Permanent Temperature sensors:
      • Fibre Optics temperature sensors.
      • Theory and applications.
      • Field Examples

    1-hour Workshop: Temperature profiling and holdup.


    Day 4

     Day 4

    • Single phase flow:
      • Production Logging using two chokes under flowing conditions
      • Spinner calibrations to convert rotations per second of spinner to flow rates.
      • Determine the productivity Index (PI) for any selected zone. Zone selection is not needed before data acquisition.
    • Uneven Depletion and resulting Crossflow:
      • Causes of uneven depletion.
      • Modelling of uneven depletion.
        • Basic Production Logging
        • Spinner Calibrations.
        • Using 2 chokes to estimate Productivity Index.
        • Estimating Productivity index (PI) and reservoir pressure (Pr) for each zone
        • Estimating the inter-zone crossflow caused by uneven depletion
    • Water and Gas Coning:

      • Basics of water and gas coning.
      • Detection of conning.
      • Coning evaluations and field examples.
    • Production logging in gas wells.

      • 2- Choke production log. Assumed single phase and used to calculate the AOF per zone

     1-hour Workshop: Uneven depletion and coning.

    Day 5

    Day 5

    • Two phase Flow.
      • Production interpretations in 2-phase flow (oi/water, oil/gas, water/gas).
      • Running Production logs using two flowing chokes.
      • Data used: Spinner, 1 hold-up measurement, Oxygen activation.
    • Three phase flow rates:
        • 2 Production logs under flowing conditions, 2 hold-up logs, Oxygen activation and phase velocity log (oil and water velocities).
    • Data used: Spinner, 1 hold-up measurement, Oxygen activation.
    • Production logging tools in horizontal wells:
        • SLB’s Flow Scanner tool.
    • Other Vendors: MAPS Tool.
    • Production log interpretations in horizontal wells.
      • Data acquisitions in horizontal wells, using full-bore spinner and Flow Scanner tools
      • Zonation
      • Spinner calibrations.
      • Threshold evaluation

    1-hour Workshop: 3 Phase Production and horizontal well production.


    This course is a must for all production and completion engineers. Petrophysicists will benefit greatly from this course that covers most of the cased hole data acquisition and interpretation for production logging. Twenty field examples will be used in the daily workshop sessions.

    The workshop level will dictate that the attendees should have been exposed to a basic and intermediate level of cased hole production logging and reservoir monitoring. The participants should also have at least an average level of experience in the use of cased hole log interpretations.

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