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Gas Lift Design and Optimization Using NODAL Analysis

Rajan Chokshi, PhD
Rajan Chokshi, PhD

INSTRUCTOR: Rajan N. Chokshi, PhD or Gabor Takacs, PhD
DISCIPLINE: Engineering
COURSE LENGTH: 5 Days (Classroom) / 10 Half-Day Sessions (Live Online)
CEUS: 4.0
AVAILABILITY: Public, In-House, & Live Online


Check back in periodically for updated Public and Live Online course dates! To schedule an In-House course, contact SCA’s Training Department at

WHO SHOULD ATTEND: Production, reservoir, completion, drilling and facilities engineers, analysts, operators, and anyone interested in learning about the implications of gas-lift systems for their fields and reservoirs.

COURSE DESCRIPTIONGas-lift is one of the predominant forms of artificial lift used for lifting liquids from conventional, unconventional, onshore and offshore assets. Gas-lift and its various forms (intermittent lift, gas-assisted plunger lift) allows life of well lift-possibilities when selected and applied properly. This course is designed to give trainees thorough understanding of gas-lift technology and related application concepts.

The course covers main components, application envelope, relative strengths and weaknesses of gas-lift and its different forms like intermittent lift, gas-assisted plunger lift. Trainees solve examples and class problems throughout the course. Animations and videos reinforce the concepts under discussion. A unique feature of this course is discussion on digital oil field and machine learning applications in gas-lift optimization.

Option: Client’s real-time system-based workflows and examples can be incorporated in the class discussions. Requires two-days of consulting and access to the client system at least 4 weeks before the class.


  • Understand the fundamental theories and procedures related to Gas-Lift operations.
  • Easily recognize the different components of the gas-lift system and their basic structural and operational features.
  • Be able to design a gas-lift installation.
  • Understand how digital oilfield tools help address ESP challenges.
  • Recent advances in real-time approaches to the production monitoring and lift management.


  • Pre-test
  • Introduction
    • Artificial Lift: When / Why / What of Lift Mechanisms; Types
    • How Gas-lift is same and different from other lift forms.
    • Well Life Cycles and gas lift Applicability vis a vis other lift methods
  • Well Performance: Review of Fundamentals
    • Systems/NODAL Analysis
    • Reservoir Performance: Productivity Index & Inflow Performance Relationship (IPR)
    • PVT Analysis
    • Multiphase Flow
      • Flow Correlations & Mechanistic models; Flow Regimes/maps
      • Pressure Gradient Curves
      • VLP: Vertical Lift Performance
  • Gas Lift Installation Types
    • Tubing Flow Installations
      • Open Installation
      • Semi-Closed Installation
      • Closed Installation
      • Chamber installations
    • Casing Flow and Other Installations
  • Gas Lift Valves
    • Gas Lift Valve Types
    • Supporting Calculations
    • Valve Construction Details
    • Valve Mechanics of IPO Valves (Class Problems)
    • Dynamic Performance of Gas Lift Valves
    • Setting of Gas Lift Valves
    • Application of Gas Lift Valves
    • Running and Retrieving Gas Lift Valves
  • Continuous Flow Gas Lifting
    • Principles of Continuous Flow Gas Lifting
    • Installation Design Calculations (Class Problems)
    • The Effects of Operational Parameters
    • Surface Gas Injection Control
  • NODAL Analysis of Continuous Flow Gas Lifted Wells
    • Description of System Performance
    • Constant Wellhead Pressure Cases (Class Problems)
      • Unlimited & Limited Lift Gas Availability
      • The Equilibrium Curve Method (Class Problem)
    • Variable Wellhead Pressure Cases
    • System Stability
  • Optimization of Continuous Flow Gas Lift Installations
    • Basic Principles
    • Optimization of a Single Well for Prescribed Liquid Rate
      • Existing Compressor (Class Problem)
      • Compressor to be Selected
  • Optimization of Continuous Flow Gas Lift Installations (Cont.)
    • Single-Well Optimization for Unlimited Rate
      • The Economic Slope Method
    • Allocation of Lift Gas to a Group of Wells
      • The Equal Slope Method (Class Problem)
  • CASE STUDY: Optimizing the Operating Conditions in a Major Gas-Lifted Field
  • Unloading Design for Continuous Flow
    • Unloading Valve String Design
      • Valve String Designs (Class Problem)
    • VIDEO Presentation: The Unloading Process
  • Intermittent gas-lift basics & overview of design
  • Plunger Assisted Gas-lift & Gas-assisted Plunger lift
  • Analysis and Troubleshooting Continuous Flow Gas Lift Wells
    • Troubleshooting Tools and their Use
      • Two-Pen Pressure Recordings
      • Downhole Pressure and Temperature Surveys
      • Acoustic Surveys
    • Common Gas Lift Malfunctions
      • Downhole Problems
      • Distribution and Gathering System Problems
  • Gas Lift Application in Unconventional Production
  • Digital Oil Field for Production Optimization
    • Production Optimization and Digital Oil Field (DOF)?
    • Available Technologies
    • Downhole P/T Measurements Components
    • Surface Flow Measurement Components
    • Role of software in visualization, analysis and surveillance
    • Brief discussion on use cases for data analytics
  • Post-test