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GeoSierra's patented active resistivity
method of providing real-time images of injected fracture geometry
during construction was conceived and developed over a number of
years.
This allows the installation of the reactive barrier wall to be
monitored in real time during injection to determine its geometrical
extent and to ensure fracture and wall coalescence, or overlap,
occurs. The gel iron mixture is energized by a 100Hz low voltage
source. Down-hole resistivity receivers are monitored to detect
changes in induced voltages by the propagation of the fracturing
fluid. From these induced voltages and utilizing an incremental
inverse integral method, the fracture geometry is displayed in real
time during the installation process.
The first commercial application of the technology was for the installation
of the iron PRB at the Caldwell Superfund Site in Fairfield, NJ
in 1997. Since then GeoSierra’s real-time imaging technology
has been used at all GeoSierra PRB installations to ensure each
PRB is constructed as planned according to quality assurance specification
requirements.
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