Gas Lift Troubleshooting

In Oil Production

About this class

According to many industry experts
Gas Lift is the least understood artificial lift method, but the reason behind
that is not its complexity. While when you do things wrong on other artificial
lift methods (e.g. ESP) your well will stop producing, a Gas Lift well will
often keep on producing even with a bad design. Hence many operators often do
not realize that their Gas Lift well is not producing at its full potential and
don’t pay attention to it.

There is therefore a very significant potential for production increase by
understanding the principles of Gas Lift and this is a huge opportunity for any
engineer willing to master this artificial lift method.

This class is the 5th of
the series of courses related to Gas Lift artificial lift. It follows the
courses “Understanding the Forms of Gas Lift”, “Gas Lift Equipment”, “Gas Lift Unloading
Sequence and Mandrel Spacing Design” and “Gas Lift Optimization and Design with Existing
Mandrels”. It explains how to find wells that require troubleshooting. It then
describes a method to properly identify the issue that the well suffers from,
list the different diagnostics that can be performed to confirm the issue and
proposes solutions to be implemented to solve the problem. Course then guide
you across must know troubleshooting tools, methods and operations. Student
will learn how nodal analysis (Quicklook function in Prosper) can help them in
their diagnostic, the different methods that can be used to start a Gas Lift
well, the effect of temperature on Gas Lift valve opening pressure... A large section
of the training is dedicated to leaks, how to detect them (tubing casing
communication tests), what survey can be done to precisely identify their depth
(flowing pressure and temperature surveys, spinner, spectral noise logging
tool…) and how to fix them . Several troubleshooting exercises will then be
shown in order to get some practice using the presented Gas Lift
Troubleshooting Method.


Participants will acquire a deep
understanding on how to troubleshoot a Gas Lift well. The Gas Lift
Troubleshooting Method explained in this training has been developed by the
author of the course himself and is therefore not available anywhere else in
the industry.


Section 1:

  • The troubleshooting challenge – how to identify wells that need troubleshooting

  • Troubleshooting methodology

  • Problem & symptoms table

  • Troubleshooting flowcharts presentations

  • Review of all possible issues one by one, their symptoms, the available diagnostics, the possible causes and the solutions

  • Troubleshooting summary – The most useful solutions that should always be tried

Section 2:

  • Nodal analysis – The Quicklook ad
    Multipoint Quicklook in Prosper

  • The effect of temperature on Gas
    Lift Valve opening & closing pressure

  • The different method to start a Gas
    Lift well and when to use each of them

  • Generalities on tubing casing leaks

  • Tubing casing communication tests -
    Procedure and depth estimation

  • Leak depth methods of identification
    review – description, advantages and limitations

o    Pressure/Temperature/Spinner surveys (and also how to use them for

Multi finger caliper

Leak detection tool by Peak Well System

Pony tail and tell tale

Spectral noise logging tool

CO2 tracer aka WellTracer from AppSmiths

Summary table for better selection of most appropriate method

  • Description of available solutions
    to fix a leak

  • Use of an Echometer to confirm a

Section 3

  • Troubleshooting exercises

  • Barton Charts analysis

Designed for:

  • Production, Petroleum or Well
    Performance Engineers to learn how to troubleshoot a Gas Lift well and review
    all the tools available to help them to do so

  • Field Production Personnel to understand
    how to identify wells that need troubleshooting and what can be done at their
    level to solve the issue


  • Understanding of the well production mechanisms (inflow &
    outlfow) is preferred

  • Knowledge of the existing forms of Gas Lift and Gas Lift equipment
    (especially Gas Lift valves and orifice)

  • Understanding of the Gas Lift unloading sequence and Gas Lift

  • Basic knowledge on well architecture

  • Awareness on the oilfield terms.


  • Announcements

    Welcome!  This training course is the culmination of researching papers, manuals, and lessons learned from my years of experience in the field.  I have carefully selected the best material to help you grasp concepts quickly and retain them for years to come.

    Our courses go through a continuous improvement process, which is critical for ensuring industry best practices and topics remain relevant with technological advancements.  Your feedback also plays a vital role in the process.  Thus, we welcome your thoughts on the course and encourage your input for future improvement of this training course.

    Thank you for purchasing this course.

  • Tips for online training
  • Illustrations to download

    Print these slides and use them to take notes along the videos.

  • 01-The troubleshooting challenge
  • 02-Troubleshooting methodology
  • 03-Problem & symptoms table
  • 04-Troubleshooting charts
  • 05-Chart 1 - Gas Lift supply issue
  • 06-Chart 1 - Obstruction on gas inlet
  • 07-Chart 1 - Obstruction on the production outlet
  • 08-Chart 1 - Production separator issue
  • 09-Chart 1 - Downhole issue
  • 10-Chart 1 - DHSV closed
  • 11-Chart 1 - First GLV too deep
  • 12-Chart 1 - Downhole obstruction
  • 13-Chart 1 - GLV closed
  • 14-Chart 2 - Gas inlet & production outlet issues
  • 15-Chart 2 - First GLV too deep
  • 16-Chart 2 - Downhole obstruction
  • 17-Chart 2 - GLV closed
  • 18-Chart 3 - Low CHP compare to network pressure
  • 19-Chart 3 - Low reservoir inflow
  • 20-Chart 3 - GL rate too low
  • 21-Chart 3 - Orifice set too high
  • 22-Chart 3 - Leak
  • 23-Chart 3 - KOP too low
  • 24-Chart 3 - Unloading valve dome pressure too low
  • 25-Chart 3 - GL rate too low
  • 26-Chart 3 - 2nd GLV too deep
  • 27-Chart 3 - KOP selected too high
  • 28-Chart 3 - Downhole obstruction
  • 29-Chart 4 - Introduction
  • 30-Chart 4 - Low CHP compare to network pressure
  • 31-Chart 4 - Inflow lower than expected
  • 32-Chart 4 - Unloading valve dome pressure too low
  • 33-Chart 4 - GL rate too low
  • 34-Chart 4 - Orifice set too high
  • 35-Chart 4 - Leak
  • 36-Chart 4 - KOP chosen too low
  • 37-Chart 4 - Incorrect calibration & valve failure
  • 38-Chart 4 - KOP selected too high
  • 39-Chart 4 - GL rate too low
  • 40-Chart 4 - Next GLV set too deep
  • 41-Chart 4 - Tubing pressure at orifice increased
  • 42-Chart 4 - GL rate above orifice critical rate
  • 43-Chart 4 - Downhole obstruction
  • 44-Chart 5 - Introduction
  • 45-Chart 5 - Instable source of GL
  • 46-Chart 5 - IGL well robing gas
  • 47-Chart 5 - Unstable production separator
  • 48-Chart 5 - Adjacent well heading
  • 49-Chart 5 - Injection across big leak
  • 50-Chart 5 - Injection across throttling valve
  • 51-Chart 5 - GL orifice too small or GL rate too high
  • 52-Chart 5 - GL orifice oversized or GL rate too low
  • 53-Chart 5 - Slug or churn flow
  • 54-Troubleshooting summary
  • Quiz #1
  • 55-The Quicklook function in Prosper
  • 56-Effect of temperature on GLV opening pressure
  • 57-Starting well with choke fully open
  • 58-Starting well with closed choke
  • 59-Well rocking
  • 60-Tubing-casing leaks
  • 61-Tubing-casing communication test
  • 62-Hole depth estimation - Case 1
  • 63-Hole depth estimation - Case 2
  • 64-Hole depth estimation - Case 3
  • 65-Leak depth methods of identification
  • 66-Flowing P-T-spinner survey
  • 67-P&T flowing survey procedure and processing
  • 68-Multi finger caliper
  • 69-Leak detection tool
  • 70-Pony tail
  • 71-Spectral noise logging tool
  • 72-WellTracer from AppSmiths
  • 73-Leak detection tool summary table
  • 74-Leak reparation options
  • 75-Echometer shot
  • Quiz #2
  • 76-Troubleshooting exercise 1-Q1&2
  • Quiz #3
  • 77-Troubleshooting exercise 1-A1&2
  • 78-Troubleshooting exercise 1-Q3&4
  • Quiz #4
  • 79-Troubleshooting exercise 1-A3&4
  • 80-Troubleshooting exercise 1-Q5
  • Quiz #5
  • 81-Troubleshooting exercise 1-A5
  • 82-Troubleshooting exercise 1-Q6
  • Quiz #6
  • 83-Troubleshooting exercise 1-A6
  • 84-Troubleshooting exercise 2-Q1-3
  • Quiz #7
  • 85-Troubleshooting exercise 2-A1-3
  • 86-Troubleshooting exercise 2-Q4
  • Quiz #8
  • 87-Troubleshooting exercise 2-A4
  • 88-Troubleshooting exercise 3-Q1
  • Quiz #9
  • 89-Troubleshooting exercise 3-A1
  • 90-Troubleshooting exercise 3-Q2-8
  • Quiz #10
  • 91-Troubleshooting exercise 3-A2
  • 92-Troubleshooting exercise 3-A3
  • 93-Troubleshooting exercise 3-A4
  • 94-Troubleshooting exercise 3-A5
  • 95-Troubleshooting exercise 3-A6
  • 96-Troubleshooting exercise 3-A7
  • 97-Troubleshooting exercise 3-A8
  • 98-Troubleshooting exercise 4-Q1-5
  • Quiz #11
  • 99-Troubleshooting exercise 4-A1&2
  • 100-Troubleshooting exercise 4-A3
  • 101-Troubleshooting exercise 4-A4
  • 102-Troubleshooting exercise 4-A5
  • 103-Troubleshooting exercise 4-Q6
  • Quiz #12
  • 104-Troubleshooting exercise 4-A6
  • 105-Troubleshooting exercise 4-Q7
  • Quiz #13
  • 106-Troubleshooting exercise 4-A7
  • 107-Barton chart interpretation - Generalities
  • 108-Barton chart 1 - Questions
  • Quiz #14
  • 109-Barton chart 1 - Answers
  • 110-Barton chart 2 - Questions
  • Quiz #15
  • 111-Barton chart 2 - Answers
  • 112-Barton chart 3 - Questions
  • Quiz #16
  • 113-Barton chart 3 - Answers
  • 114-Barton chart 4 - Questions
  • Quiz #17
  • 115-Barton chart 4 - Answers
  • 116-Barton chart 5 - Questions
  • Quiz #18
  • 117-Barton chart 5 - Answers
  • 118-Barton chart 6 - Questions
  • Quiz #19
  • 119-Barton chart 6 - Answers
  • Conclusion

    Congratulations, you have reached the end of the training. 

    We hope you enjoyed the learning experience. Please don't hesitate to send us your comments and feedback to help us improve the experience.  

    Thank you for purchasing this course, and don't forget to check out our other training content.

  • Spectral noise logging tool illustration video
  • Echometer dual shot webinar presentation and video 1
  • Echometer dual shot webinar presentation and video 2
  • Pictures of Gas Lift valve ball cut due to valve chattering

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