Geologic Resources: The Small-Diameter Well Quandry  The Friendly Woolly Mammoth  The Friendly Dinosaur
The Small-Diameter Well
Quandary

 
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    Making Measurements in Small-Diameter Wells


The small-diameter well quandry often confronts geoscientists and engineers who, in an effort to be "cost-effective", often install small-diameter borings and wells.   The small-diameter borings and wells, by themselves, do not pose a quandary.   However, making measurements and obtaining samples often does.

 

Some Solutions

Water level measuring devices and oil/water interface meters do not always fit readily down small-diameter wells.  The measuring probes and tapes also tend to cling to small-diameter well casings, especially when they are moist.   These problems can be minimized by using the right equipment.  Water level and oil/water interface devices with small-diameter probes and narrow tapes can be used.   For example, Heron Instruments water level instruments come with probes smaller than 1/2-inch in diameter.    Sometimes the small probe, because it is lighter in weight has a problem making its way down the well.   This may be overcome, in some cases, by adding extra weights.

Some Help from HeronHeron dipper-T water level meter

Heron will add extra weight to the end probe upon request.   Also, upon request, Heron will attach a smaller 3/8-inch (9.5 mm) end probe to a Dipper-T instrument in place of the standard 5/8-inch (16 mm) where smaller diameter is required.   Sufficient weight on the probe is critical for the tape to move down the well properly.

 

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