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Introduction

Strength

Electrical Power

Electrical Communication

Temperature Rating

Special Cable Problems

Cable Service

Reversing a Line

Attenuation VS Freq
Graph

Electrical Fault
Location

Derivation of Fault
Detection Formula

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"CASED HOLE" Electromechanical Cable 

Introduction 

The electromechanical cable used in oilfield wireline service operations must perform  four -basic functions.

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 1N32PP cable as an example. Many wire-line service companies, throughout the world use this cable for cased-hole logging operations.

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