Well Video & Geophysical Logging Inspections

Geophysical logging is useful in interpreting aquifer and well characteristics. Our logging techniques will give you a better understanding of water production and identify potential issues with water flow and well construction.  Lotowater employs exclusively Mount Sopris logging instruments, and we offer 24/7 service.

We conduct several logs at once, resulting in a complete picture of the well and a comprehensive understanding of problem zones. 
Some of our techniques include:

Caliper logging

  • Records basic well construction details such as casing depth and borehole diameter
  • Identifies fractures and solution features

Natural Gamma & Single Point Resistance Logs

  • Measures the natural radioactivity of the soil and bedrock
  • Useful for identification of lithology and stratigraphic correlation

PolyElectric Logging

  • Measures the apparent resistivity of a volume of rock
  • Provides data for lithological and stratigraphic correlation interpretation

Flow Distribution Profiling

  • Used to locate and quantify water producing zones in a well or borehole
  • Determines water production zones and variations in aquifer permeability

Full Waveform Sonic Logging

  • Measures sound properties of both the aquifer and well
  • Useful in rock property analysis and fracture identification

Acoustic Televiewer Logging

  • Records acoustic pulse through transmitters and receivers
  • Identifies location and orientation of fractures and solution openings

Temperature logging

  • Indicates movement of water

 

Well Video:

Video logs are useful for examining the interior of an open borehole or cased well.  The well video is used for many applications including documenting basic well construction details, identifying fractures, visually examining screen and borehole conditions, identifying water producing zones, and any use where visual examination is necessary.

Our standard operating procedure includes completing a down scan while lowering the camera to the bottom of the well and a side scan while raising the camera back to surface.  At significant features during the up run, the camera is stopped and rotated 360° to provide a better understanding of the feature.  The video logs are an excellent way to visually inspect a well.  There may be discrepancies in the reported depths shown between the same features based on which camera the feature is viewed with.  Depth references made in the down scan mode are about 0.3-0.6 m less, depending on the diameter of the well, compared to the side scan readings on the way up for the same feature.  This is due to the viewing perspective differences between the two lenses and because the down scan camera is situated below the side scan camera.  The depth accuracy for the side scan image can be as much as 5 cm per 30 m of depth logged.  For determining feature depths with more accuracy, a weighted tape is lowered in the well until the bottom of the tape is visually seen at the specific feature with the camera.  Alternatively a well caliper log is also used to accurately determine feature depths.

Videos are usually performed under pumping conditions using a small sample pump but in some cases larger pumps that stress the well closer to its full capacity are used.  Pumping the well during the video provides two main purposes.  First, it clears the well of turbid water which provides a clear image.  Second, small particles can often be seen entering or exiting the well at specific water producing features of the well.  This often provides valuable qualitative information on the water producing zones of the well.