Geophysical Wireline logging Tool Electrical Resistivity Logger System Geophysical Well Logging with Automatic Winch and Depth Counter What is Geophysical Wireline logging?
Geophysical Wireline logging are used to determine physical, chemical, and structural properties of formations penetrated by drilling. The data are rapidly collected, are continuous with depth, and measure in situ properties; Logging tools were joined together in "tool strings", so that several measurements could be made during each logging run. The tool strings were lowered to the bottom of the borehole on a wireline cable, and data were logged as the tool string was pulled back up the hole. Repeat runs were made in some holes to improve coverage and confirm the accuracy of log data.
With well logs serving so many purposes, there are various types of well logs that suit each purpose.
Electrical resistivity well logs
tell you how hard it is for an electric current to pass through a formation. This is also an indication of whether the water in the potential well is fresh or salty. (Salt water conducts more electricity making it easier for the electric current to pass through.)
Acoustic well logs
tell you how easy it is for sound waves to travel through the formation. This is useful to see if water is present in the formation.
Spontaneous potential (SP) well logs
tell you how porous or permeable the formation is.
Three Arm Caliper Logging Tool
record borehole diameter. Changes in borehole diameter are related to well construction to fracturing or caving along the borehole wall
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