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<< Click to Display Table of Contents >> Quadratic Flow Equation: |
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Quadratic Flow Equation
ZONE NAME: This is an identifier that is necessary when multiple layers or complex flow is anticipated.
RESERVOIR PRESSURE (psia): The average reservoir pressure in the well's drainage area and can be obtained from pressure buildup analysis.
NET TVD THICKNESS (ft): The height or thickness of the zone believed to contribute flow. It is usually obtained from well log analysis and should be consistent with the average permeability specified.
DRAINAGE RADIUS (ft): The distance between the well and the no-flow boundary created by off-setting wells in a developed pattern. It is equal to one half the square root of the well spacing: Rectangular drainage radius = 0.5 * Square-Root( 43560 * A ) where A is the spacing (acres.) Examples
WELLBORE RADIUS (ft): The radius obtained from caliper log or from the drilling bit size when hole washout is not a problem. The Examples may be used as a guideline.
PERMEABILITY (md): The absolute (i.e., fluid independent) permeability averaged over the net thickness of the zone. These values are typically obtained from measurements on core samples using air as the fluid medium. Effective (i.e., fluid dependent) permeability estimates can be obtained from pressure transient analysis. These estimates can then be converted to absolute permeability values.
SKIN FACTOR: A dimensionless number representing the near wellbore condition of damage or stimulation, where a positive factor indicates damage and a negative factor indicates stimulation. This factor is obtained from pressure transient analysis of draw down or buildup data. It is important to remember that the completion effects are included in this number, i.e. horizontal wellbore, perforation density, gravel pack, etc..
WATER CUT: The fraction of the total liquid flow stream that is made up of water. In the results, fluid rate data is reported as TOTAL fluid which includes this water cut fraction.
*Note: This Help File update will be completed at a later time.