If the speed of the power cord and the cable is too high, and the speed of the lower cable is too high, the descent speed of the cable will be greater than the descent speed of the downhole tool. This is because the buoyancy of the cable is less than that of the downhole tool, resulting in insufficient cable tension. Make the cables pile up on the top of the downhole tools. This improper use of cables will directly cause substantial damage to the cables, which will greatly reduce the life of the cables.

This kind of damage can cause the cable core and the cable to malfunction, and the error of the depth measurement. The cable is loosened or the cable tension changes due to the rapid lifting of the cable in the well, which will cause the cable diameter to change continuously, which makes logging difficult. . The change of the length of the lay length of the ropes is changed with the change of the cable diameter, and finally an open gap is formed between the ropes of the ropes, which makes it necessary to re-correct the diameter and the length of the ropes frequently. . Conductive cores are often positioned and adjusted. Because of the limited elasticity of copper, the distortion of conductive cores in the form of kinks and breaks will definitely follow.

Rapid cable speed changes, improper method of changing the drum speed will cause cable damage. Any changes in the cable movement should be gradual and no sudden jumps at all. Because the speed of heavy objects such as downhole instruments undergoes large inertial changes, it is accompanied by huge stress and cable tension.

When the instrument is lifted up, the adsorption force and resistance produced by the instrument passing through the liquid can be considered as one of the main factors. Experience has proved that only when the reading of the weight indicator decreases, the cable lifting speed can increase, and this can compensate for the adsorption force generated Tension force.

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