1 / 25

Online Analysis of Continuous-Flow Gas-Lift Wells

Online Analysis of Continuous-Flow Gas-Lift Wells. Jim Hall – Shell Int’l E&P 10 February, 2004 ASME/API/ISO Gas-Lift Workshop. G/L Analysis - Art or Science ?. Its an Art! Listen Watch the gauge Feel the flowline Visualise “Use for Force, Luke”. G/L Analysis - Art or Science ?.

owenr
Download Presentation

Online Analysis of Continuous-Flow Gas-Lift Wells

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Online Analysis of Continuous-Flow Gas-Lift Wells Jim Hall – Shell Int’l E&P 10 February, 2004 ASME/API/ISO Gas-Lift Workshop

  2. G/L Analysis - Art or Science ? • Its an Art! • Listen • Watch the gauge • Feel the flowline • Visualise • “Use for Force, Luke”

  3. G/L Analysis - Art or Science ? • It’s a Science! • Process Variables • Pressure, Temperature, Flow • Other Data • vibration, sound • Correlate • cycle frequency, amplitude • Compare • models, previous behavior

  4. Fallacies of the Art • Based on individual judgement and experience • Not always consistent • Difficult to teach to others • Difficult to document and re-use • Artists don’t always like to share their skills

  5. Advantages of the Science • We know more now than we did “then” • Valve Performance • “Nodal” analysis of production systems • Multiphase flow behavior • Consistent and Repeatable – rules based • Can be taught to others • Can be documented and a usable history constructed • Scientists like other people to use their discoveries

  6. So, What’s the Process? • 1. Build a model

  7. So, What’s the Process? • 2. Calibrate the Model to Reality

  8. So, What’s the Process? • 3. Use the Model for Surveillance • Well tests, BHP/T surveys, etc.

  9. So, What’s the Process? • 4. Analyse Performance

  10. So, What’s the Process? • 4. Take Action and Confirm Results • Install Bigger Orifice • Lower Injection Pressure • Unloading Valve Closed

  11. Non-Steady State Wells are a Problem • Process Variables are just that…Variable • Production Pressure • Injection Pressure • Injection Rate • Production Rate • This means that each set of conditions must be analysed to determine the well behavior for that set of conditions.

  12. But I’m BUSY! This takes TIME! • Find the problem well • Collect time-series data • Input one data set • Analyse results • Input next set of data • Analyse results • Etc • Etc

  13. One Solution – Manual, with good tools

  14. One Solution – Manual, with good tools • Nice, but what Injection pressures go with what Production pressures?

  15. Better Solution – Semi-Automatic • 1. Automated identification of problem wells – Don’t look at ALL the wells… Note: Screen Shots taken from a static system (offline)

  16. Better Solution – Semi-Automatic • 1. Automated identification of problem wells - Just look at the PROBLEM wells Note: Screen Shots taken from a static system (offline)

  17. Better Solution – Semi-Automatic • 2. Confirmation of automated identification Note: Screen Shots taken from a static system (offline)

  18. Better Solution – Semi-Automatic • 3. Zoom on a window of data Note: Screen Shots taken from a static system (offline)

  19. Better Solution – Semi-Automatic • 4. Package the data for an analysis tool Note: Screen Shots taken from a static system (offline)

  20. Better Solution – Semi-Automatic • 5. Confirm that the data is correct and Send Note: Screen Shots taken from a static system (offline)

  21. Better Solution – Semi-Automatic • 6. Analysis tool starts, selects the well and presents a “VCR” frame control for playback of data, step by step Note: Screen Shots taken from a static system (offline)

  22. Better Solution – Semi-Automatic • 7. For each step forward in time, the latest and previous traverses are displayed. Note: Screen Shots taken from a static system (offline)

  23. Better Solution – Semi-Automatic • Data displayed for each time step • Production pressure traverse • Injection pressure traverse • Valve opening and closing pressures • Valve status (open, closed, throttling) • Data set playback options • Single step forward • Single step backward • Play entire set non-stop

  24. Advantages of Technique • Link to real-time system • Identify problem wells quickly • Easy movement of multiple data sets for analysis • Functionality supported by analysis tool • Receives data from real-time system • Uses existing, calibrated model for analysis • Ability to analyse as a single data set • Ability to analysis as a time series data set • Re-design as soon as problem is identified

  25. What’s next? • Improve real-time system functionality • Automate data transfer and analysis • “trigger” analysis when heading alarm is raised • Improve analysis tool functionality • Save plots and reports of automated analysis • Improve “VCR” functions • Present options for addressing problems

More Related