GeoSierra’s 3rd generation hydraulic pulse interference
receiver pressure gage consists of a high precision (1/10,000psi) differential
wet/wet temperature compensated gold plated strain gage device. The gage is amplified and compensated with
micro-circuitry to provide a 4-20mA current amplitude over its full range. The microcircuit is encapsulated in a high
density resin for use in hostile groundwater environments at depth.
All of GeoSierra’s pulse receiver
strings contain the new 3rd generation gage. The gage has been used operationally in pulse
interference tests at numerous sites for a number of years without
loss of functionality or precision.
hydraulic pulse interference test is ideal to hydraulically characterize
fractured bedrock systems, to determine explicitly the directional hydraulic
connectivity and transmissivity of the fracture network. Recent pulse tests on fractured dolomitic
bedrock show the rapid response in uncased monitoring wells some 500’ apart
with minimal injection of fluid during the test. The hydraulic connectivity of
the fractured network at this site was quantified by numerous pulse test
directional arrays between 11 wells. The
transmissivity of the fracture network was determined directly from type curves
generated specifically for the fractured system.