Why Power Cords and Cables Have a Reduced Lifespan?

If the speed of the power line and the cable is too high, the speed of the cable will be too large, which will cause the cable to descend faster than the downhole instrument. This is because the buoyancy of the cable is less than that of the downhole instrument, resulting in insufficient cable tension Make the cable pile up on the top of the downhole instrument. This improper use of the cable will directly cause substantial damage to the cable, which will greatly reduce the life of the cable.

This damage can lead to failure of the cable core and casing, as well as errors in depth measurement. The loosening of the casing or the change in cable tension due to the rapid take-up and down of the cable will cause the diameter of the cable to change continuously, making logging difficult. . The change of the lay length of the rope strands changes with the change of the diameter of the cable, resulting in the formation of open gaps between the rope strands, so that the diameter and pitch length of the rope need to be re-calibrated frequently. . The conductive core is also often adjusted and adjusted. Because of the limited elasticity of copper, the distortion of the conductive core in the form of kinks and breaks will definitely follow.

Rapid changes in cable speed, improper method of changing drum speed can cause cable damage. Any changes in cable movement should be gradual and completely free of jerks. Because the speed of heavy objects such as downhole instruments has a large inertia change, it is accompanied by a huge stress and cable tension on the cable.

When the instrument is lifted, the adsorption force and resistance generated by the instrument passing through the liquid can be considered as one of the main factors. Experience has shown that the cable lifting speed can only be increased when the reading of the weight meter decreases, and this can compensate for the adsorption force. tension force.