Open Hole

1. Strength Member:  The cable must have sufficient strength to carry an instrument package to any depth.  In most cases the weight of a cable itself is the greatest part of the load.
2. Electrical Power:  The conductors in the cable must be adequate to supply electrical power from the truck to the instrumentation at the bottom of the cable.
3. Electrical Communication:  The electrical conductors must be suitable to transmit the electrical information generated by the down hole instruments to the computer or recorder in the truck.
4. Depth Measurements:  The only method of measuring the depth, at which the down hole instruments are located (and the corresponding geological beds of interest), is to measure the length of cable that has been put into the bore hole.  Without accurate depth information the instrument data is of little value.

Throughout this school we will be referring to the Camesa type 7J46RP cable as an example. Most wire line service companies, throughout the world, use this cable for open hole logging operations.

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