Due to the problems of pre-bending and force-induced length change occurring in the course of running in hole with coiled tubing,it is not possible to satisfy the requirements of coiled tubing fracturing technology for high-precision positioning of the target layer.For this reason,a casing collar locator with mechanical double positioning blocks was designed.After analyzing the advantages/disadvantages of existing casing collar locator,the structure of casing collar locator with mechanical double positionin...