Español| Home | Our Story | Distributors | News | Contact Us |

| Catalog | Manual | Features | Designation | Warranty | Calculator

Temperature Rating

Well Conditions
& Cable Dynamics

Downrating

Evaluating Cables

Manual Menu

The Temperature Rating of Well Logging Cables

Downrating a Cable's Temperature Capability

The temperature ratings for electromechanical cables specified by the manufacturers are maximums, and assume the following conditions:

• Vertical well

• Normal geothermal gradient

• Cable tension is primarily related to the weight of the cable alone

Exceptions to the above described typical vertical well frequently occur, meaning that the temperature rating of the cable must be downrated. Any time that high tension and high temperature occur simultaneously the temperature rating of the cable must be downrated. These situations include:

• Deviated wells

• Wells with high geothermal gradient

• Injection wells, especially steam

• Geothermal wells (steam production)

• Heavy logging tool string, perforating gun, packer, etc.

• High tension experienced downhole due to stuck cable, tools, gun, etc.

Depending upon well conditions and the service being performed, it may be necessary to downrate the cable by as much as 100 F or 150 F.

Other factors that can lead to temperature related insulation failures are:

• Loose outer/tight inner armor

• Shock loading of the cable (perforating while underbalanced, firing cutters, coming loose from stuck tools or guns)

Previous Page | Print Page