Borehole Geophysical Logging
EDN conducts borehole geophysical logging services and video surveys using downhole equipment and trained personnel that continue to set the industry standard.
These services are conducted 24/7, in response to our customers' needs for timely and efficient data collection.
Log interpretation and analysis are available on request — the same geoscientists who run the tools in the field read the results and write them up.
Tool inventory
Sixteen tools, and what each one tells you.
Log interpretation and analysis are available on request. Suites are assembled per hole — casing, fluid and formation decide which tools go down.
Fluid Temperature
Locates inflow and outflow zones by the thermal signature of water entering the borehole.
Fluid Conductivity
Distinguishes water of different chemistry entering the hole at different depths.
3-Arm Caliper
Measures borehole diameter — finds washouts, fractures and casing condition.
Natural Gamma
Correlates stratigraphy and identifies clay-rich units through casing.
Short (16") & Long (64") Normal Resistivity
Two depths of investigation into the formation for lithology and fluid character.
Single Point Resistance
High-vertical-resolution log for picking fracture and bedding contacts.
Spontaneous Potential
Indicates permeable zones and relative formation-water salinity.
Acoustic Televiewer
Oriented 360° acoustic image of the borehole wall — strike and dip of every fracture, including in opaque fluid.
Optical Televiewer
Oriented 360° true-colour image of the borehole wall in clear water.
Color Borehole Video Survey
Downhole video for direct visual inspection of the hole, casing and screen.
Heat Pulse Flowmeter
Measures low-rate vertical flow in the borehole under ambient and pumped conditions.
Brine Tracing
Tracks an injected saline slug to identify flow zones and cross-connection.
Induction
Formation conductivity through PVC casing, where electric logs cannot be run.
Full Waveform Sonic
Acoustic velocity and amplitude for rock quality and fracture characterization.
Cement Bond Log
Verifies the annular seal behind casing.
Idronaut CDT303 Water Quality Probe
Downhole conductivity, depth and temperature profiling with a precision multiparameter probe.
Proof
41 documented sites where this service was used.
A sample below — the full list, with the prime contractor named on each, is on the projects page.
Salford Quarry Superfund Site
Harleysville, PA · U.S. Army Corps of Engineers
Cidra Groundwater Contamination Superfund Site
Cidra, PR · CDM
Crosley Farm Superfund Site
Berks County, PA · CDM
Chem-Fab Superfund Site
Doylestown, PA · HGL, AECOM, Wood
Former Ft McClellan Site
Anniston, AL · Geosyntec
Precision Plating Superfund Site
Vernon, CT · AECOM, TRC
Ft Detrick Area B Groundwater
MD · ERM
Raymark Superfund Site
Montgomery County, PA · HGL
Federal Creosote Superfund Site
Mansville, NJ · CDM
Spectron, Inc. Superfund Site
Cecil County, MD · ERM, OBG
Kellogg-Deering Wellfield
Norwalk, CT · GZA
Hidden Lane Landfill
Sterling, VA · EA Engineering
Next step
Tell us about the borehole.
Depth, casing, formation, what you are chasing and when you need to be in the field. A geoscientist will come back to you — not a form response.
Whiteland Technology Center
924 Springdale Drive, Exton, PA 19341
Field services are scheduled directly with the office. Logging and video surveys are conducted 24/7 in response to customer need.