QL40-SFM
Bi-directional Spinner Flowmeter
Measures impeller rotation caused by fluid flow in borehole
Description
This QL40-SFM measures impeller rotation caused by fluid flow in the borehole. It uses a magnetically coupled pick-up which drives a low friction, high resolution encoder located inside the lower pressure housing. The encoder produces 256 pulses per shaft rotation. It has quadrature sensing electronics that instantaneously detect flow rate direction and changes.
The QL40-SFM is a bottom sub, and can be combined with other logging tools in the QL (Quick Link) product line or operated as a stand alone tool. Weight bars with centralizers are recommended to improve log response and repeatability in large boreholes or low flow environments.
Applications
- Pumping flow profiles in screened or perforated cased holes
- Identification of hydrostratigraphic units
- Confirmation of predicted transmissive zones in open hole
Downloads
-
QL40-SFM Manual PDF
Technical Specifications
Tool
- Diameter: 40mm (1.6”)
- Length: 0.9m (35.4”)
- Weight: 3.2kg (7.05 lbs)
- Temp: 0 - 70°C (32 - 158°F)
- Max. Pressure: 200bar (2900psi)
Sensor
- Pickup sensor: 3000 RPM max.
- Accuracy: > 1%
- Resolution: 256 pulses/revolution
- Output: Counts/second
- Standard cage/impeller assembly: 50.8, 76.2, or 101.6 mm (2, 3, or 4”)
Operating conditions
- Cable type: Mono, multi-conductor, coax
- Compatibility: Scout Pro / Opal (Scout / Bbox / Matrix)
- Digital data transmission Telemetry: Variable baudrate telemetry according to cable length/type & surface system
- Logging: Static/dynamic or dynamic while pumping
- Centralisation: Recommended
- Borehole conditions:
- Fluid-filled borehole
- Open borehole or perforated screen casing
Principle of measurement
A bouyant impeller mounted on a hollow stainless steel shaft is suspended between two precision ground ceramic bearings. A balanced transfer bulkhead fitted with magnets couples motion and direction from the impeller through a sealed sensor body inside the probe. A low friction high resolution encoder detects this information and transfers it digitally to a counter circuit that sends the information by wireline modem to the surface.
Measurements features
- Spinner up in CPS
- Spinner down in CPS
- Tool speed in m/min
