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Project-2 Investigation of Artificial Lift Techniques in Horizontal Gas Wells

Project-2 Investigation of Artificial Lift Techniques in Horizontal Gas Wells. Cem Sarica. Drivers. Several Artificial Lift Methods Have Been Tried in Horizontal Wells on Trial & Error Basis

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Project-2 Investigation of Artificial Lift Techniques in Horizontal Gas Wells

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  1. Project-2Investigation of Artificial Lift Techniques in Horizontal Gas Wells Cem Sarica

  2. Drivers • Several Artificial Lift Methods Have Been Tried in Horizontal Wells on Trial & Error Basis • Velocity Strings, Surfactants (Soap Sticks Or Liquid Soap Injection), Beam Pumping, Plunger Lift, and Gas Lift • Performance and Applicability of Each Methods is Strongly Influenced by the Multiphase Flow Behavior and Distribution of Fluids in the Well

  3. Objectives • Experimentally and Theoretically Investigate Performance of Various Artificial Lift Methods to Unload Horizontal Wells • Collect Field Data and Summarize Field Practices • Develop Performance Evaluation Tools Based on Flow Dynamics and Well Construction Profile • Generate an Unloading Method Selection Criteria Based on Field Data, and Experimental and Theoretical Results

  4. Study Plan • Experimental • Design and Construct a Versatile Facility to Accommodate All Artificial Methods • Perform Testing Based on Prioritized Schedule • Model Development for Considered Artificial Lift Method • Develop an Artificial Lift Selection Tool

  5. Experimental Study • Operating Conditions of Horizontal Wells Will Experimentally Be Simulated Using a Large Scale Experimental Facility • Facility is Being Designed With the Following Features • One and Two Undulations • Will Start With One Undulation • Large Pipe Diameter, 5-in. ID • Gas and Liquid Feeds Along the Test Section to Mimic the Horizontal Well Fractures • Toe-up and Toe-down Configurations • Ability to Incorporate and Test Various Artificial Lift Methods

  6. Experimental Study … • Testing Program • Investigation of Efficacy of Various Artificial Lift Methods • Various Gas and Liquid Flow Rate Combinations Typical of Liquid Loading • Detailed Test Matrix Will Be Developed Based on Final Configuration of Test Section and Artificial Lift Methods to Be Investigated

  7. Large Scale Facility • Gas: Air • Liquid: Water • Liquid Superficial Velocity 0.07 to 2 ft/s • Gas Superficial Velocity 0.07 to 6 ft/s

  8. Large Scale Facility … Main Tower Last Support Supports 5 ’’ 310 ft (744D) Process Facility 6 in High Pressure Loop Machine Shop

  9. Large Scale Facility … 5 ’’ 40 ft (120D) 310 ft (744D) 5 ’’ 5 ’’

  10. Large Scale Facility … • Estimated Construction Schedule • Engineering Design – November 2012 • Manufacturing of the Structure – March 2013 • Assembly of the Facility – July 2013 • Start of Testing – September 2013 • Estimated Cost Without Artificial Lift Equipment • $300,000

  11. Modeling • Mechanistic Model (Physics Based) to Predict the Efficacy of Various Artificial Lift Methods • Experimental and Field Data Will Be Utilized in Model Development

  12. Testing Priority • Several Artificial Lift Techniques Need to be Prioritized for Testing • Criteria • Cost • Chance of Success • Operating Window • Infrastructure Requirements

  13. Testing Priority … • Based on Cost Criteria (Subjective and Potentially Biased Ordering) • Velocity String • Foam • Plunger Lift • Venturi • Gas Lift • ESP • Sucker Rod

  14. Testing Priority … • TU Needs Guidance from Membership on Testing Priority • Questionnaire will be Sent to Membership

  15. Random Thoughts on Various Artificial Lift Methods • Velocity Strings • Angle Effects on Effective Velocity • Effect of Eccentricity • Gas Lift • No Head Reduction Help • Increase in Gas Velocity • Compression Requirements • Higher Pressures • Foam • Documented Success for Vertical • Not Known for Horizontal • Low Velocities can be a Serious Issue

  16. Random Thoughts on Various Artificial Lift Methods … • ESP • Typically Good for High Liquid Flow Rates • Fluid Segregation at Low Spots • Exposure to Dry Gas • Power Availability • Plunger Lift • Fall Issues in Horizontal • Dog Leg Severity • Sucker Rods • Lifting Depth and Rod Life Due to Well Geometry Problems (Build Rate, Dog Leg Severity • May Need Pump Controller to Deal With Slugging

  17. Deliverables • Unloading Performance of Various Artificial Lift Methods and Their Comparative Analysis • Experimental Data

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