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7-Gas Lift optimization and design with existing mandrels


Product description

According to many industry experts Gas Lift (GL) 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 GL well will often keep on producing even with a bad design. Hence many operators often do not realize that their GL 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 GL and this is a huge opportunity for any engineer willing to master this activation method. 

This class is the 4th of the series of courses related to gas lift activation. It follows the courses “Forms of GL”, “GL equipment” and “GL unloading sequence and mandrel spacing design”. It explains how you can optimize the production of a GL well with its current GL design as well as how you could optimize it by changing the valves using the existing GL mandrels. Student will be guided to make the GL design of a well using abacus (which mandrels should be equipped with a valve, a dummy or an orifice) so that they can understand the principles behind these choices and how to select their parameters properly (e.g. kick off pressure). The last part of the training explains how to make such a GL design using the software Prosper. Student will be guided within the “GL design existing” form in Prosper (meaning of each parameter to be filled and recommendation on best option to select).  

Course Curriculum: 

GL optimization and design with existing mandrels: 

  • Optimization starts by good monitoring 

  • Optimization by GL rate change 

  • GL design optimization – cases review 

  • Can I optimize a GL well by choking it?

  • Global network optimization

  • How to identify GL wells that can be optimized 

  • Exercise – Propose a GL design for a well using abacus 

  • Why changing your SPM design? 

  • Why changing your GL design using existing mandrels? 

  • How to determine the targeted liquid rate of a well following a GL design

  • Process to perform a GL design using Prosper 

  • How to fill the “GL design – Existing Mandrels” form in Prosper 

  • Dual GL completion optimization and design 

This course is designed for: 

  • Production, Petroleum or Well Performance Engineers to understand how to increase the production of their GL wells, how to monitor them properly and how to make a new GL design 

  • Field Production Personnel to understand how their GL well work and respond better to the questions of their support teams in town 

  • Completion Engineers to understand fully the needs for a new GL design. 


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

  • Knowledge of the existing forms of GL and GL equipment (especially GL valves) 

  • Good understanding of the GL unloading sequence 

  • Basic knowledge on well architecture  

  • Awareness on the oilfield terms. 

Course Objectives:  

Participants will acquire a deep understanding on how to optimize a GL well. Through the review of cases, they will learn how to recognize a well that can be optimized and see how to achieve it. This is a key knowledge to be able to increase the production of any GL well. They will be explained the concept of GL design through an exercise and will be coached so that they can perform such a design themselves using a software to assist them (Prosper). 

Bonus Material: 

  • The full video “Introduction to Gas Lift” (18 min) from my course “Introduction to Artificial Lift” 

  • Gas lift presentation video from Weatherford 

  • A document from PTC (available on their website as well) giving guidelines for GL design. 

  • Links to download a GL manual from international supplier, a GL simulator from GL industry expert and access a gas compressibility factor calculator. 


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