The Flowmeter tool is used to make fluid flow-rate measurements in producing wells.
It contains a unique 24 pulse/revolution sensor section that operates with the SPN-B rotating magnet impeller unit, together with an electronics section that digitizes the sensor count-rate and produces a 12-bit binary word including a direction bit. The high number of pulses per revolution together with the low threshold of the SPN-B and the fast 16 times/sec sampling allow unprecedented resolution of complex flow regimes.
The SPN-B Spinner is equally sensitive to fluid flow in both axial directions, with a rotation rate linearly proportional to flow speed. A new shrouded design eliminates sensitivity to transverse flow or Coriolis effect, which can lead to serious errors in inclined or horizontal wells, or where the flow from perforations may enter the casing at significant rates.
The assembly is very rugged, using a shroud with the same metal-thickness as a pressure housing, so that the spinner is capable of supporting the entire weight of a tool-string without damage. As with all CBG PL tools, all surfaces exposed to the borehole are 100% Titanium or compatible materials, including the impeller.
The graph below shows typical measurement accuracy of the flowmeter and spinner tool as tested in a water flow loop.
The graph below shows typical measurement accuracy of the flowmeter and spinner tool as tested with air flow.