Flowmeter logging

Under ambient conditions, flowmeter logs are used to identify the direction and magnitude of vertical flow within boreholes. Under stressed conditions, flowmeter logs are used to identify the transmissive fractures within the borehole by measuring the rate of water entering the borehole at each fracture while simultaneously pumping from or injecting into the top of the borehole at a low rate. Collectively, these data are critically important for assessing the flow regime; determining the location, transmissivity, and hydraulic head of fractures in the borehole; designing well completions to minimize cross contamination; and planning water-quality sampling strategies.

For more information see:
water.usgs.gov/ogw/bgas/publications/FracRock04_Johnson/