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Air Drilling Tight Gas Reservoirs
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Air Drilling Tight Gas Reservoirs

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Shows how tight gas reservoirs can be drilled cost effectively with air as the circulating system

Shows how tight gas reservoirs can be drilled cost effectively with air as the circulating system

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Air Drilling Tight Gas Reservoirs Air Drilling Tight Gas Reservoirs Presentation Transcript

  • Air Drilling Tight Gas Reservoirs Diederik Zwager & Frank Seidel
  • Air Drilling Gas Reservoirs How we get away with it
    • #1: keep the pressures low
      • No restrictions at the surface
    • #2: no liquid hydrocarbons
      • If present, switch to membrane N2
    • #3: preferably no water influxes
      • Can be handled by misting, foam
  • Air Drilling Equipment
    • Primary air compressors
    • Booster
    • Mist Pump
    • Rotating head
    • (Grant, Washington, Williams)
    • Float valves
    • Fire float/stop
  • Blooie Line & Flare
    • Flow line jet (venturi)
    • Igniter
  • Percussion Air Hammers (Cubex, Drill-Quip, Ingersoll-Rand, Numa, ...)
    • With air/mist, sometimes foam
    • Typical max dP only 250 psi
    • Require low weight on bit, controls deviation
    • Special carbide insert bits
    • Wide variety of sizes
    WATER CHECK VALVE WEAR SLEEVE INTERNAL CYLINDER PISTON PIN DRIVE SPLINE SYSTEM BIT
  • San Juan Basin, New Mexico
    • San Juan Basin, New Mexico, USA
      • Cretaceous, Sandstone Reservoirs
      • 75 years of commercial gas production
      • 7% of US gas production
      • 30,000+ wells drilled
      • 1,700 – 2,200 m measured depth
      • 250 – 3,000 psi BHP
      • 0.01-0.1 md rock quality
  • San Juan Basin Drilling
    • Mud drill intermediate hole
    • Casing set through producing water intervals
    • Air/Nitrogen drill production hole
    • Tight pay zones flow little gas
    • Drilled with Air Hammers and Bits : up to 50 m/hr
  • Mereenie & Palm Valley Amadeus Basin, NT
      • Pacoota sandstone
        • Extremely hard (50kpsi compressive strength)
        • Mud rop: 1 m/hr
  • Mereenie & Palm Valley Amadeus Basin, NT
    • Air Drilling
      • No water influxes
      • Used air hammers
      • 15 – 20 m/hr
    • Palm Valley
      • Usual 10-15 mmscfd
      • Extremes of 69 & 136 mmscfd encountered
    • Mereenie
      • Up to 30 mmscfd/well
    • Very abrasive
      • Significant wear on rotating head
      • Ceramic liners considered
      • Drill oversize holes, allow bit to wear
  • Bit Trips & Completions
    • Bit trips & completion
      • Strip live well through rotating head
      • Run retrievable packer, use snubbing unit to run completion
  • Air Drilling Tight Gas Reservoirs
    • Keeps swelling shales dry
    • No lost circulation, no formation damage, in sub-normal pressured zones
    • Provides increased penetration rate, no chip hold down
    • Provides less hole deviation, less weight on bit required
  • Contact Energy Ltd New Zealand
    • Reductions in Formation Damage
      • (Fewer) Cuttings material in fractures
    • Enhanced Well productivity
      • Olkaria 3 – 5 MWe/well drilled conventially
      • 8 – 12 MWe/well drilled with air
      • Mokai 5 – 10 MWe/well drilled conventially
      • 8 – 20 MWe/well drilled with air
      • Rotokawa 5 – 10 MWe/well drilled conventially
      • 10 – 30 MWe/well drilled with air
      • Putauaki 5 – 8 MWe/well drilled conventially
      • 12 – 20 MWe/well drilled with air
      • Ohaaki 2 – 6 MWe/well drilled conventially 8 – 15 MWe/well drilled with air
    • Reduced thermal recovery period
  • Reykjavik Energy, HS Energy Iceland
    • Fractured volcanic
      • World record 12-1/4” tri-cone bit runs
      • 1,472 m @ up to 30 m/hr (May 21-26, 2006)