ANSDIMAT

# One well pumped at a constant rate

Analytical equations and methods for aquifer test analysis

1. Superposition principle:

2. Green’s function:

3. Green’s function (from leaky aquifer):

where

1. Superposition principle:

where

2. Green’s function:

where

Methods of analysis and parameters being estimated

 Plot Method Parameters Comments straight line 1) matching matching matching by separate points matching matching by separate points matching type line matching type line matching straight line 2) matching matching straight line 1) matching bisecting line

Analysis is based either on superposition principle or on Green’s function.

1) by drawdown values at steady-state (the transmissivity value calculated using Green’s function would be twice lower);

2) the graph is plotted only for the equation based on superposition principle.

1. Superposition principle:

2. Green’s function:

3. Green’s function:

where

Methods of analysis and parameters being estimated

 Plot Method Parameters Comments straight line matching straight line 1) matching matching matching by separate points matching matching by separate points matching matching matching matching matching straight line 1) matching bisecting line

Analysis is based either on superposition principle or on Green’s function.

1) use initial recovery data for straight line (the transmissivity value calculated using Green’s function would be twice lower).

Applying superposition principle gives:

Applying Green’s function gives:

1. Superposition principle:

2. Green’s function:

3. Green’s function:

where

1. Superposition principle:

where

2. Green’s function:

where

Methods of analysis and parameters being estimated

 Plot Method Parameters Comments straight line 1) matching matching matching by separate points matching matching by separate points matching matching matching straight line 2) matching matching straight line 1) matching bisecting line

Analysis is based either on superposition principle or on Green’s function. Green’s function being applied, the number of terms in the series should be increased.

1) use final recovery data for straight line (the transmissivity value calculated using Green’s function would be twice lower);

2) the graph is plotted only for the equation based on superposition principle.

1. Superposition principle:

2. Green’s function:

3. Green’s function:

where

Methods of analysis and parameters being estimated

 Plot Method Parameters Comments straight line 2) matching matching matching by separate points matching matching by separate points matching type line 1) matching type line 1) matching straight line 3) matching matching straight line 2) matching bisecting line

Analysis is based either on superposition principle or on Green’s function.

1) method is applied for drawdown analysis only;

2) for steady-state (the transmissivity value calculated using Green’s function would be twice lower);

3) method is applied for drawdown analysis only (the graph is plotted only for the equation based on superposition principle)

Applying superposition principle gives:

Applying Green’s function gives: