Analysis of slug-tests with high-frequency oscillations

Abstract

Extensive slug-test experiments have been performed at the Hydrogeological Experimental Site (HES) of Poitiers in France, made up of moderately fractured limestones. All data are publicly available

From 3D Seismic to 3D Reservoir Deterministic Model Thanks to Logging Data: the Case Study of a Near Surface Heterogeneous Aquifer

“…1 m or more in well M21. The heatpulse flowmeter (HPFM) log conducted under pumping conditions indicates that the M21 productivity is only controlled by the inflow level located at 85-87 m. HPFM conducted on the other wells of the HES show that HES well productivity is mainly controlled by up to three inflow levels: a level around 50 m, one around 90 m and the last around 110 m (Audouin et al, 2008;Audouin and Bodin, 2007). Each well intercepts 0, 1 or 2 of these levels.…”

Validation of non-Darcian flow effects in slug tests conducted in fractured rock boreholes

“…These categories are: (1) in wells in non-indurated granular geologic deposits that have well screens surrounded by granular (sand or gravel) packs (e.g., McElwee et al, 1992McElwee et al, , 1993Butler et al, 1996;McElwee, 2002;Butler et al, 2003). (2) in wells in rock that also have screens with or without granular packs (e.g., Audouin and Bodin, 2007;Zenner, 2009), and (3) in open holes in rock where there is no screen or granular pack such that the hydraulic test concerns only the rock mass without any restrictions or complications imposed by the well completion geometry. The literature concerning straddle packer tests in fractured rock hydrology uses exclusively open holes without screens or gravel packs (e.g., Snow, 1965;Maini, 1971;Gale, 1982;Novakowski, 1988;Quinn et al, 2011a).…”

“…Therefore, unlike tests conducted in wells with screens and sand or gravel packs, it is reasonable to assume that the skin effects are absent in straddle packer tests conducted in open holes. In previous reports concerning non-Darcian flow observed in slug tests conducted in fractured rock, the tests were conducted in wells with long well screens surrounded with gravel packs (e.g., Zenner, 2009) or wells with screens without gravel packs with an open annulus inside the casing to the surface (Audouin and Bodin, 2007;Ostendorf et al, 2009). The geometry of these fractured rock wells with screens with/without granular packs may introduce uncertainties related to apparent skin effects or other responses different from those of packer tests conducted in open holes where there are no potential restrictions on flow related to well completion geometry.…”

Contribution of Seismic and Acoustic Methods to Reservoir Model Building

“…Secondly, the volume of the karstic bodies represents only a small percentage (2 to 3 %) of the reservoir volume. This volume was estimated by analyzing borehole images (Audouin & Bodin, 2007). …”