The utility model discloses a coiled tubing tubular column device for steamed dilatation is arranged to the salt cavern underground natural gas storage tank, coiled tubing tubular column device include the outer card connector of coiled tubing, oil pipe, aggravate tub, hydraulic pressure safety joint, rotary washing instrument, the coiled tubing bottom through the outer card connector of oil pipewith aggravate the union coupling, the other end that aggravates the pipe passes through hydraulic pressure safety joint and is connected with the rotary washing instrument. Adopting coiled tubing tubular column device to carry out row steamed dilatation, can utilizing the rotary washing instrument can effectively wash the sediment of jam open coiled tubing down to the chamber at the bottom of orin the sediment, steamed passageway be arranged to the reformation, and the unable remaining brine of arranging at the bottom of the steamed chamber within the bottom surplus about 20% of steamed tubular column is arranged to the tradition of effectively discharging.