Ability of Single-Well Injection-Withdrawal Experiments to Estimate Ground Water Velocity

F. Maier[1], K. Hebig[2], Y. Jin[1], and E. Holzbecher[1]
[1]Georg-August Universität Göttingen, Göttingen, Germany
[2]Technical University Berlin, Berlin, Germany

The authors present a closer look on the Single-Well Injection-Withdrawal Experiment (SWIW) or Push-Pull Experiments and its ability to determine the groundwater velocity, as one of the major parameters concerning reservoir management and underground reservoir characterization. The flow field is modeled using analytic and numerical solutions. Different modes like Darcy-law, solute-transport and partial-differential-equation are applied and compared.

A challenge in the model setup is the boundary change from Dirichlet BC to Neumann BC within the proceeding time-dependent study. Finally we present type-curves for different experiment scenarios. It is shown that these curves strongly depend on interaction between the parameters for groundwater velocity, pumping rates and the duration of the quiescence phase as well as the effective porosity and dispersivity.