Perforation and caliper logging combined operation method and downhole pipe string group

The invention provides a perforation and caliper logging combined operation method and a well descending pipe string group, and the perforation and caliper logging combined operation method comprises the following steps: S1, a multi-arm caliper logging instrument and a perforation tool string are connected through a connecting cable to form the well descending pipe string group; s2, after it is judged that the descending pipe string set reaches an underground target layer according to the magnetic positioner, the perforation tool string is ignited, so that the bridge plug falls off, and a sleeve is set; s3, after the bridge plug is set and sleeved with the casing pipe, the perforation tool string is ignited, and the perforator conducts perforation operation on the casing pipe; s4, after perforation operation is completed, a measuring short section on the multi-arm hole diameter logging instrument conducts hole diameter logging operation; and S5, after the well diameter logging operation is completed, the well