This course covers the design, operation, diagnosis and optimisation of gas lift systems including a review of gas lift equipment, valve operation and the unloading process. You will gain an appreciation of the key concepts involved in the application of gas lift methods and a practical understanding of their operation and optimisation. Well modelling software will be used to illustrate design and troubleshooting applications while network modelling software will illustrate gas lift gas allocation and field wide optimisation techniques.
Course Level: Foundation / Skill Instructor: Alastair Baillie
Designed for you, if you are...
Petroleum engineering or field staff involved in the selection, design, operation or troubleshooting of gas lift systems
How we build your confidence
This course ensures that fundamental concepts of gas lift systems are well explained and clearly understood before progressing to more advanced topics such as design and optimisation. This technique means that participants have a solid foundation to build a deep understanding of gas lift systems and the confidence to apply the principles learned.
The benefits from attending
The objectives of the course will be to enable participants to:
Become familiar with gas lift methods, concepts of operation and equipment
Perform gas lift design procedures for new or existing wells
Recognise the correct data required for well analysis and troubleshooting
Diagnose and troubleshoot gas lift well performance
Optimise the gas lift system for production and long term reliability
Day 1: Gas lift systems concepts and equipment
Introductions and course objectives
Review and recap of well and reservoir performance fundamentals; oil composition and fluid characterisation
Gas lift introduction; concepts and theory, gas lift performance curves and depth of injection
Pressure gradient traverse plots and generation using multiphase flow correlations
Gas lift equipment overview; gas lift valve operation and equations; installation and removal
Teardown and inspection of gas lift equipment; well integrity issues
Gas lift references and resources
Practical workshop session; gas lift valve hand calculations
Day 2: Gas lift systems design
Gas lift design overview (conceptual vs. detailed) and principles
Generating 4 variable lift curves for gas lift wells
Practical workshop session; conceptual gas lift design
Gas lift unloading process and key factors to ensure success
Consideration of safety factors for mandrel spacing and valves operation
Detailed gas lift design procedure for continuous gas lift wells; special applications
Practical workshop session; conceptual and detailed gas lift design and exporting VLPs
Days 3 - 4: Gas lift systems diagnosis, practical troubleshooting and optimisation
Gas lift operations, monitoring and procedure for unloading a new well
Gas lift diagnosis and troubleshooting; key concepts and procedure for analysis
Flowing gradient survey interpretation and matching; determination of injection depth, orifice pressure drop, etc.
Practical workshop sessions; building and matching of well models using field data
Practical workshop sessions; gas lift well diagnosis using gradient traverse plots with field data
Dealing with problem wells (instability, slugging, multi-point injection etc.)
Re-design of a gas lift valve setting for an existing well to address these problems
Practical workshop session; gas lift well re-design using existing mandrels with field data
Introduction to surface network modelling; well performance curves, interactions between wells and pipelines
Shortage of gas supply; gas-lift allocation concepts & multi-well optimisation techniques
Practical workshop session; building a wellhead platform model with field data
Matching field performance and running gas lift gas allocation sensitivities
Review, conclusions and evaluation form completion
Note: Each day will include practical workshop sessions illustrating the application of theory to gas-lift well models. Participants are encouraged to bring field data and examples to interpret and analyse.
Workshop: During the 4-day session the instructor would aim to use client’s well data throughout and participants should be able to build, validate and diagnose their own wells. So each day will include practical workshop exercises using commercial software (either Prosper from Petroleum Experts or WellFlo from Weatherford). The course is designed to be highly interactive and the instructor is always open to answering questions as they arise. Note: If the software package GAP from Petroleum Experts or ReO from Weatherford is available for the participants, additional practical exercises on gas lift optimisation could be arranged (optional).