Reinforced Polymer Tubing for Enhanced Liquid Lifting in Gas Wells

Transcription

1 Gas Well De-Liquification Workshop Denver, Colorado March 1-3, 2004 Reinforced Polymer Tubing for Enhanced Liquid Lifting in Gas Wells Jay Wright, President Polyflow, Inc.

2 Benefits of Thermoflex Strings Excellent Corrosion Resistance Lower Pressure Drop vs. Steel Light Weight/ Reduced Installation Costs Minimal Ongoing Maintenance 2004 Gas Well De-Liquification Workshop Denver, Colorado 2

3 What Are Thermoflex Strings? Multi-layer Reinforced Polymer Coiled Tubing Inner/Outer Layers for Corrosion and Surface Smoothness Aramid Fibers for Strength and Creep Resistance Center Layer for Strength to 250F max. Sizes and Installation Same as Steel Coiled Tubing Less Force Requirements Required Couplings on Each End 2004 Gas Well De-Liquification Workshop Denver, Colorado 3

4 How do Thermoflex Strings Enhance Gas Well De-Watering? Reduced Surface Roughness of Polymers vs. Steel Steel Relative Roughness.005 Thermoflex Relative Roughness Thermal Insulation Properties of Plastic vs. Steel vs. 360 BTU*in/hr*ft 2 *F for Plastic vs. Steel, respectively Material Compatibility of Polymers... Enhanced Corrosion Resistance/ Minimal Oxidation Minimizes Buildups 2004 Gas Well De-Liquification Workshop Denver, Colorado 4

5 Where is the Energy Lost at Low Flowing Velocities? 80% 70% 60% 50% 40% 30% 20% 10% 0% Steel Pipe Energy Loss ft/sec 70.3% 0.1% 2.5% 0.1% 27.0% Velocity Friction Couplings Thermal Gravity 2004 Gas Well De-Liquification Workshop Denver, Colorado 5

6 Where is the Energy Lost at Liquid Lifting Velocities? 50% 40% Steel Energy Loss ft/sec 40.5% 38.9% 30% 20% 10% 0% 20.0% 0.1% 0.5% Velocity Friction Couplings Thermal Gravity 2004 Gas Well De-Liquification Workshop Denver, Colorado 6

7 Steel vs. Thermoflex Pressure Drop Comparison Pressure Drop of Thermoflex Tubing vs. Steel Tubing Length = 5000 ft, Diameter = Ø Pressure Drop (psi) Production (mcfd) Thermoflex Tubing Steel Tubing 2004 Gas Well De-Liquification Workshop Denver, Colorado 7

8 Production Case #1 Background 2 3/8 Steel Tubing to 8,500ft. Slugging Flow Production Rate 160 MCF/day No Artificial Lifting Mechanisms Installed 1.75 Thermoflex 2004 Gas Well De-Liquification Workshop Denver, Colorado 8

9 Case #1... Results MCF/day psi Steel Thermoflex 2004 Gas Well De-Liquification Workshop Denver, Colorado 9

10 Production Case #2 Background Depth of Well 5,600ft Production Rate 55 MCF/day Previous Deliquification Methods 1.5 Steel Tubing with plunger than soap Installed 1 Thermoflex 2004 Gas Well De-Liquification Workshop Denver, Colorado 10

11 Case #2... Results Continuous Lifting of Water Production Equivalent to Plunger Experienced Partial Ice Plug in Well Head from Rapid Expansion of Gas MCF/day Before After 2004 Gas Well De-Liquification Workshop Denver, Colorado 11

12 Production Case #3 Background 2,100ft to Perfs Liquid Loading 9-10 MCF/day production Shut in Pressure 200psi Current Deliquification Method... Swabbing and Shut in and Blow Installed 1 Thermoflex 2004 Gas Well De-Liquification Workshop Denver, Colorado 12

13 Production Case #3... Results Daily Production Week Avg Gas (mcf/d) Avg H2O (gal/d) 2004 Gas Well De-Liquification Workshop Denver, Colorado 13

14 Installation Methods 2004 Gas Well De-Liquification Workshop Denver, Colorado 14

15 Key Considerations for Success Suitable Candidates 10:1 MCFD to BPD Fluid Pressure Differential between Line and BHP Minimum Rate to Lift Water (Coleman Eq.) Continuous Flow vs. Cycle During Install/Operations Collapse Installation in Water Injection Down Tubing Production (mcfd) Well Head Pressure (psig) Ø1.00 Ø1.25 Ø Gas Well De-Liquification Workshop Denver, Colorado 15

16 Benefits of Thermoflex Tubing Continuous Lifting of Fluids Lower Pressure Drop/ Less Back Pressure on Reservoir Critical Velocities Achieved with less MCF/day Superior Corrosion Resistance Minimal Maintenance & No Ongoing Consumable Expense Installation in Casing or Existing Tubing Rapid Installation 2004 Gas Well De-Liquification Workshop Denver, Colorado 16