Well periphery ultrasonic imaging downhole cartridge scanning head

The invention relates to a well periphery ultrasonic imaging downhole cartridge scanning head, which comprises N ultrasonic crystals (N is a natural number larger than or equal to 2) and a shell, wherein the shell is a hollow cylinder, the ultrasonic crystals are installed in crystal installation through holes on the sidewall of the shell, the emission receiving surfaces of the ultrasonic crystals face to the outside of the shell, the tails of the ultrasonic crystals face to inside of the shell, the ultrasonic crystals are in sealed connection with the crystal installation through holes, the N ultrasonic crystals are uniformly distributed on the sidewall of the shell around the axial line of the shell, the N ultrasonic crystals are the same in height, the lower end of the shell is sealed, a rotation shaft hole is arranged at the center of the upper end of the shell, and the rotation shaft of the downhole cartridge is installed in the rotation shaft hole. The well periphery ultrasonic imaging downhole cartridg