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Calculate Conductivity (k) from Packer Test result. – Coal Geology and Mining: Consulting Services

Calculate Conductivity (k) from Packer Test result.

Cs

Calculate Conductivity (k) from Packer Test result.

[ReviewAZON asin=”1406733539″ display=”inlinepost”]First determine what zone is represented by the Packer intervals:

  • Zone 1: Unsaturated zone above the water table.
  • Zone 2: Intermediate zone with both unsaturated and saturated zone.
  • Zone 3: Zone below the water table

Determine head loss from published graphs – required when flow is >2 gallons/min

Zone 3 (Saturated, below water table)-Straddle packer

K=Q/(Cs*r*H)
  • K=conductivity
  • 2.Q=Average flow recorded during test (unit: gpm or ft/s)
  • 3.Cs=Conductivity coefficient for saturated material (depends on length of test interval
  • and diameter of borehole; get it from published graph.
  • 1.r=radios of borehole (unit: feet)
  • 2.H=Effective Head=h1+h2-L
  • 3.h1=depth to water table from pressure gage
  • 4.h2=amount of pressure applied for the test zone (recorded during packer test)
  • 5.L=friction loss; calculate if flow is >2gpm from published graphs.

Find Cs from Published graph:

Cs

Cs

Calculate L (Friction loss from published graphs/tables)

You may need: Hydraulic Field Manual for the table of head loss based on Darcy’s Law:

Buy Here: [ReviewAZON asin=”0071348328″ display=”inlinepost”]

A = Length of Test Interval
r = Radius of Borehole
C s = Conductivity Coefficient (from published graph)
h 1 = Distance from Gage to Water Table
h 2 = Applied Pressure at Gage
L = Friction Loss of pipe
H = Effective Head (h 1 + h 2 – L)
Q = Steady Flow Rate of Injection
K = Hydraulic Conductivity

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