PowerPoint PresentationDate
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Capillary and Chemical “Lift” Definitions
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Capillary Lift
Soap Stick Lift
Continuous Backside Lift
© 2006 Weatherford. All rights reserved.
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© 2006 Weatherford. All rights reserved.
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Turner Equation: Calculates flow velocity that keeps “liquid drop” stationary in flow stream; calculate critical velocity necessary to maintain drag force.
Velocity of flow in the tubular configuration that will cause droplet to remain stationary
Liquid Loading: Turner Equation
Drag from flowing gas is tending to lift water droplet which is reacting to GRAVITY and trying to remain at bottom of a well.
Gravity
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Step 2:
Once you’ve determined velocities are too low for water, but capable of remedy by foam….
Design the “Foam Lift” System
© 2006 Weatherford. All rights reserved.
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Fill?
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Considerations
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Field Chemical Test Process
Foam qualities are measured utilizing the industry standard test method (high speed blenders)
Foam Height vs concentration
Height of Foam after initial MIX
Foam ½ life vs concentration
Record time for 100 mls water to reshow
Looking for 1 min/3,000’…No more than 2.5 min/3,000’
Observations are included (water vs hydrocarbon ratios and emulsion tendencies)
How do we determine the right chemical….
Sample and “Field” Test…
© 2006 Weatherford. All rights reserved.
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Run Economics
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4% CO2, 20 ppm H2S
BHT = 250oF, WHFT = 100oF
Operator begins soap stick program
1,000 MCFPD
2,500 PSI
Choke, X/64ths
GAS VELOCITY