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Cable Installation for
Deep Wells

Cable Tension During
Installation

Operational Situations

Working Loads

Receiving & Handling

Installation & Spooling

Operating and Maintenance

Common Abuses

Damage Caused by
Excessive Tension

Wire Line Spooling

Installation Tension for
Well Logging Cables Chart

Cable Damage Due
to Drum Crush

Figures 1 - 5

Example for a 7H42 Cable

Example for a 7H47 Cable

Cable Installation
Tensions

Installation Tension
Graph

Manual Menu

Operating and Maintenance

Running Conditions

Many operating conditions vary from job to job. Rate of running speed, either paying out of returning cable to the winch drum, depends upon a particular condition of each operation. Constant tension, however, must be maintained at all times. Damage from overruning or sudden release of tension may cause:

• Bird caging
• General loosening of armor wire
• Kinking
• Conductor fatigue
• Possible insulation failure

Proper judgment must also be exercised in selecting correct running gear or equipment. Improper operating angles or excessive friction holding devices could cause permanent cable damage.

Storing Electro-Mechanical Cable

When not in use, electromechanical cable should be stored in a dry place free from corrosive fumes, and protected from the weather. The outer layer of cable on the reel should be protected by a coating of lubricant.

If possible, cable on idle equipment should be cleaned lubricated, wound on a reel, and stored in a dry place where it is protected from the weather. If it is not possible to remove the cable from the equipment, the entire cable should be cleaned and lubricated.   This lubrication should be heavy enough to protect the cable against corrosion.

Corrosion Protection

Electomechanical cables are normally coated with a rust inhibitor during the process of manufacture. If this initial rust inhibitor is not sufficient to last the life of the cable, periodic applications of a lubricant or rust inhibitor are advisable. Lubricants should:

• Be free from acids and alkalies
• Have sufficient adhesive strength
• Be nonsoluable under prevailing conditions
• Have a high film strength
• Resist oxidation
• Should not be damaging to insulation
• Preferably contain water displacement additives

Cables should be cleaned before being lubricated. Cleaning may be done with wire brushes or other suitable devices. The entire length of the cable should be pressure lubricated uniformly.

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