The dynamic characteristics of the tubing string for solution mining of oil/gas storage caverns are studied preliminarily. It is implied that the buckling of tubing string will induce damage and failure of tubing. Through the preliminary study of vibration characteristics of tubing string without space constraint

the critical velocity expression of tubing string in an ideal condition is obtained. Computation analysis shows that the tubing string without space constraint will generally suffer buckling due to fluid-solid coupling vibration; and the inner casing will reach buckling prior to the out casing generally. Considering the importance and complexity of this problem

the influences on the critical velocity analysis mechanical model of conditions

axial force

fluid pressure

solution mining cycling method

horizontal constrains

and the coupling of axial liquid hammer and transverse vibration

are discussed roughly. Finally

considering space constraint

some research advices on the all-sided analysis of the tubing string dynamic characteristics are proposed.