Constraints on Hydraulic Anisotropy From Periodic Pumping Tests Using a Double?Packer System

Periodic pumping tests are now being used to characterize subsurface hydraulic parameters owing several advantages over conventional tests, for example, option of superposing periodic excitations on transients by the data processing in frequency domain. We derive an analytical model using a double-packer system isolate injection interval borehole penetrating either confined or unconfined anisotropic aquifer. The model, which is apt injectivity analysis and axial interference analysis, was evaluated comparing it previously presented solutions diffusion equation considering appropriate limits regarding length, storage capacity interval, aquifer specific yield. constrains ratio axial-to-radial conductivity. Radial conductivity constrained prescribing anisotropy ratios. combination two analyses narrows down range estimated properties. application our field from fault zone crystalline rocks yields subvertical at least 10 times greater than horizontal value, agrees qualitatively with geometry. By proper choice period, can be not only assess integrity packers their immediate surrounding but also extend understanding features.