ANSDIMAT

# Several wells pumped at a constant rate

Analytical equations and methods for aquifer test analysis

Unsteady-state flow equation:

Equation for quasi-steady-state flow period:

where

Methods of analysis and parameters being estimated

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

In the last equation r1 can be substituted by the distance to any pumping well (this distance is used for hydraulic diffusivity estimation by type line method).

Simultaneous start and simultaneous shutdown of all pumping wells is assumed.

Unsteady-state flow equation:

Equation for quasi-steady-state flow period:

where

Methods of analysis and parameters being estimated

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

Simultaneous start and simultaneous shutdown of all pumping wells is assumed.

Unsteady-state flow equation:

Equation for quasi-steady-state flow period:

where

Methods of analysis and parameters being estimated

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

Simultaneous start and simultaneous shutdown of all pumping wells is assumed.

Unsteady-state flow equation:

where

Methods of analysis and parameters being estimated

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

1) method is applied for drawdown analysis only.

Unsteady-state flow equation:

Equation for quasi-steady-state flow period:

where

Methods of analysis and parameters being estimated

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

Nt number of pumping wells at time t;

ti – time at which pumping of the i-th well started.

1) number of straight-line intervals of the plot corresponds to the number of pumping well startings;

2) all observation points fall on a straight line.