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RG Heat-Pulse Flowmeter Probe

Heat-Pulse Flowmeter Probe

The heat-pulse flowmeter sonde is used to measure low flow rates which may lie below threshold limits of conventional impeller tools.

PRINCIPLE OF MEASUREMENT
The probe contains a horizontal wire-grid heating element and thermistors located above and below it. Apertures in the tool permit the free flow of well fluid through the assembly. Pulses of electric current are applied to the heating grid under surface command, warming fluid in the vicinity of the grid. The warm fluid front migrates towards the thermistors where it is detected. Depending on the direction of flow, either upper or lower thermistor detects the warm fluid front first. The time taken to reach the detector gives an indication of flowrate.

   
FEATURES
Detection of very low vertical flow rates
Auto-null command cancels tool offsets prior to each measurement
Optional natural gamma and casing-collar locator (CCL)
MEASUREMENTS
Flow
Natural gamma
Casing collar locator (CCL)
APPLICATIONS
Water Vertical flow measurement within the boreholes
Location of permeable zones in water wells
OPERATING CONDITIONS
Borehole type Open-hole, water-filled
Centralisation Recommended
The probe is designed for stationary measurements only. Normal logging consists of a series of stationary point measurements across the zone of interest.
SPECIFICATIONS
Diameter 50mm
Length 2.24m
Weight 9.4kg
Max. temperature 70ºC (extended range available)
Max. pressure 20MPa (extended range available)
Measurement range 0.1 to 3m/min
Natural-gamma detector 50mm x 25mm NaI(Tl) scintillation crystal
SALES INFORMATION
Probe
25 073 000 Heat-pulse flowmeter probe
25 074 000 includes natural gamma
25 075 000 includes CCL
Accessories
21 001 000 Centraliser range 90 - 180mm
21 002 000 Centraliser range 180 - 260mm
21 003 000 Centraliser range 260 - 342mm
21 004 000 Centraliser range 342 - 472mm
20 070 000 Natural-gamma API calibrator without source
30 010 000 3.7MBq 137Cs source for natural gamma calibrator

 

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  Robertson Geologging Ltd, Deganwy, Conwy, LL31 9PX
Robertson Geologging (USA) Inc, 11115 Mills Road, Suite 117, Cypress, Texas 77429, USA