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Temperature

Pressure

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Cables Operating Under High Pressure and Temperature

Bill Bowers
3/21/89

Temperature

The maximum temperature rating of oil field cables is based on the maximum temperature occurring at the bottom of the hole where the tension of the cable is at a minimum. This is the normal condition of an oil well with the temperature of the hole, and therefore cable decreasing up the hole to surface temperature. This means that at the bottom where the cable experiences maximum temperature it will be exposed to minimum tension and near the surface it will experience maximum tension and minimum temperature.

Cables will not satisfactorily operate at maximum tension and maximum temperature. At maximum tension the radial pressure generated by the load in the armor wires will cause the plastic, softened by maximum temperature to exude between the armor wires resulting in electrical failure.

When cables are used where they experience both high temperature and high tension simultaneously, then the cable temperature rating must be reduced as much as 100°F. Each application must be considered separately and no general statement can be made.

Examples of these operations include geothermal wells, steam injection wells, and any operation with a packer or clamp is involved that exerts unusual radial pressure on the cable.

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