|
| | |
 |
Method Name: |
|
Fluid logging, Flow meter |
|
| | |
|
| | |
|
Method Type: |
|
Borehole Methods
|
|
| | |
|
|
|
Assigned Problems: |
|
|
|
|
| | |
|
Principle: |
|
Flowmeter: records the direction and rate of vertical flow in the borehole.
Fluid-resistivity or mud-resistivity log: records the electrical resistivity or conductivity of the borehole fluid.
Fluid density: records the pressure. |
|
| | |
|
| | |
|
Keywords: |
|
Impeller flowmeter; packer flowmeter; fluid logging; transmissivity, permeability; flow rate; pressure; electric resistivity |
|
| | |
|
| | |
|
Prerequisites: |
|
- Clear water in boreholes for flowmeter necessary
- Exchange of drilling fluid with saline or deionised water in case of fluid logging and pumping tests necessary
- Impeller flowmeters (most widely used) have a minimum detectable flow velocity (depending on the instrument between 0.5 - 1.5 m / min); Heat-pulse and electromagnetic flowmeters can resolve velocities of less than 3 cm / min
- Borehole-diameter corrections are needed (caliper log)
|
|
| | |
|
| | |
|
Resolution: |
|
Resolution between 0.5 - 1.5 m / min (depends on instrument type); Heat-pulse and electromagnetic flowmeters can resolve velocities of less than 3 cm / min |
|
| | |
|
| | |
|
Expected Results: |
|
- Measured parameter: flowmeter: vertical flow in m / s ; fluid resistivity in Ωm; conductivity in μS/cm; fluid density: kg / m3
- Data analysis: logs: measured parameter vs. depth in m
- Interpretation: permeability and transmissivity
|
|
| | |
|
| | |
|
Combination with other Methods: |
|
- Required additional information: caliper log (correction for flowmeter logs)
- Related add-on information: temperature log (correction for fluid-resistivity logs)
- Independent additional information: other logs; packer tests; laboratory analyses
|
|
| | |
|
| | |
|
Operating Expense: |
|
- Crew size: 1 - 2 persons
- Acquisition speed: see ""Parameters to specify""
- Processing: depending on problem
- Equipment rental costs: intermediate to high
|
|
| | |
|
| | |
|
Parameters to specify: |
|
- Instrument type
- Logging speed (3 - 8 m / min; stationary)
- Water table draw down for pumping test
|
|
| | |
|
| | |
|
QC Documents: |
|
- Calibration data: last shop-calibration or on-site calibration
- Flowmeter: repeated measurements with different acquisition speed
- Borehole information (i.e., casing (type and length), diameter, deviation, fluid properties)
- Complete headers
- Field notes (e.g., all activities, effective time schedule, present personnel)
|
|
| | |
|
| | |
|
Products: |
|
- Field logs (displayed using specified scales)
- Composite logs
- Listings, histograms
- Interpretation
|
|
|