Heat Pulse flowmeter probes are used to measure water movement up and down the borehole from which fracture-specific flow intervals and rates can be derived. The unique design permits low flow rates to be resolved.
A grid heats ambient fluids and if there is up or down flow in the well, this heated fluid mass is detected at thermistor sensors (2 cm from grid) allowing the time (and flow rate) through a known x-sectional area to be recorded by an amplifier. A complete flow measurement is made when the time is accurately measured from when the heat grid is fired to when a peak temperature change, carried by the flow, is detected by either the upper or lower sensor.
MATRIX Heat software is required for recording the data from the HFP-2293 as it is impressive the probe is stationary during the measurement procedure in order to accurately measure the flow rate.
Although the HFP-2293 cannot be stacked it is necessary to use a calliper probe to accurately measure the diameter of the borehole. In some instances an acoustic televeriewer can be used in place of a standard calliper, but not in all situations.
The Heat Pulse flow meter requires centralisers and a deviation collar to ensure flow is directed thought the measurement chamber. A variety of centralisers are supplied with the tool for common borehole diameters (20cm, 15cm & 10cm diameters).