Completion and Development of Horizontal Water Wells · Horizontal Water Wells are applicable in...
Transcript of Completion and Development of Horizontal Water Wells · Horizontal Water Wells are applicable in...
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Joel Defoe, B.Sc., P. Geo. Steve Foley, M.Sc., P.Geol. Waterline Resources Inc.
WaterTech 2014
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Why Horizontal Wells? Completion Options
Why do we Develop Water Wells? Development Options
Questions
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20m
1: Vertical Wells 2: Slant Wells
20m
3: Horizontal Wells
20m
300-1000m Heel Toe
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More water! Smaller footprint Longer screen means lower entrance velocities Use available drawdown efficiently
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“Competent and predictable” Fms Mannville Gp Spirit River Gp Devonian carbonates (?) Deep Neogene (Empress Fm ?)
Shallow(er) unconsolidated Quaternary Laterally dicontinuous?
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Fractured bedrock Competent Fms
Can be used for
borehole stability prior to running screens (if needed)
Image From: G&L SLOTCO (www.gl-slotco.com)
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Continuous wire-wrap Variety of formations Slot size based on grain size
analysis Promotes well efficiency
NOTE: Be conservative in
the “d%” used for well screen design
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Continuous wire-wrap Used in poorly sorted or
heterogeneous systems When uncertainty in
grain size exists
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Procedures that are
designed to maximize efficiency and production
Repair aquifer damage
Maximize efficient flow
rates - Filter Cake from drilling fluids
- Drilling Fluid invasion
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To produce sediment free
water at the highest possible flow rates
Increase flow of water to the well
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Once the liner/screens have been installed Use of a chemical additives to break down and help
remove the filter-cake Displace (flush) fluids from well
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Initiate pumping, gradually increase rates Simple, inexpensive and may have limited effectiveness
ESP
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Swabbing Water/Air Jetting Air-Lift pumping
Classic, effective techniques used in vertical wells
Cost proportional to time spent
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Swabbing Water/Air Jetting Air-Lift pumping
Classic, effective techniques used in vertical wells
Cost proportional to time spent
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Packer Isolated
Development Use downhole packers to
isolate sections of the screen
Allows individual screen sections to be developed
50 – 100 m
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“New” Near Wellbore stimulation
Downhole tool run on wireline
Breaks down filter cake and fines outside of the screen
Electrical/hydraulic pulse
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Horizontal Water Wells are applicable in many situations
Construction materials will depend on lithology and cost
Due to their screen length, multiple development options are available
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