Cable Installation Suggestion

Pre-installation Preparation

1. Equipment and Material Inspection:

Verify Cable Specifications

Verify Cable Specifications: Confirm that the cable type (e.g., single-core or multi-core wireline logging cable), conductor cross-sectional area, insulation rating, and tensile strength are suitable for the operating conditions(e.g., deep/shallow wells, high-temperature and high-pressure environments). To relieve the built-in internal torque.

Appearance and Quality Acceptance

Appearance and Quality Acceptance: Inspect the cable sheath for any damage, scratches, or bulging. Ensure the metal armor layer is free from corrosion or deformation. Check that connectors are properly sealed, with no oxidation or loosening of pins.

Auxiliary Tool Preparation

Auxiliary Tool Preparation: Prepare specialized equipment such as a cable reel stand, tension controller, guide sheaves, cable cutters, torque wrenches, and insulation testers. Ensure all tools are properly calibrated and certified for use.

2. Job Environment Assessment:

Rig Site/Work Area Clearance

Rig Site/Work Area Clearance: Remove sharp objects and obstacles along the cable deployment path. Level the ground to prevent cable abrasion. Implement waterproof measures in damp conditions, and equip thermal insulation protection devices in high-temperature environments.

Safety Briefing

Safety Briefing: Clarify HSE (Health, Safety, Environment) requirements. All personnel must wear hard hats, insulated gloves, and anti-slip footwear. For elevated operations, safety harnesses must be used, and warning signs must be posted.

Key Points for On-site Installation and Construction

1. Reel-to-Reel Cable Spooling

When transferring armored logging cable from a shipping reel to a winch drum, special attention must be paid to maintaining a controlled spooling tension throughout the process. The cable must be paid out and taken up synchronously without slack. Any excess or loose cable may naturally twist or kink, leading to damage under tension. The spooling operation shall generally comply with the following specifications:

• The tension of the first cable layer shall be 10%–15% of the breaking force;
• The tension of the second cable layer shall be 20%–25% of the breaking force;
• The tension of the third cable layer shall be 30%–35% of the breaking force.

Note:

At the middle position of the cable on the drum, the tension shall be set to 33%–40% of the breaking force, and then the tension shall be reduced layer by layer until the tension at the cable head reaches zero. For the rewound cable prepared in this way, even if the pulling force reaches 40%–50% of the cable’s breaking force during tripping operations from the wellbore, it will not cause deformation or damage to the underlying cable layers. Since fiber optic cables are prone to signal attenuation due to stretching, the tension applied shall be reduced on this basis.