1. n. [Formation Evaluation]
A special section of cable that is placed between the logging cable and the head of the logging tool. Unlike the logging cable, the steel load-bearing element is in the center, surrounded by the conductors that are held in an insulating jacket. The bridle is needed for most conventional electrical logs and laterologs in which the cable armor is used as a current return. To be effective, this return must be at some distance from the logging tool and insulated from it. Typical bridles are 80 ft [24 m] long. Electrodes may be wound on the outside of the bridle and connected to the logging tool for use as measurement references or for spontaneous potential measurements.