Washing device for riser of nautical oil-gas well

The invention relates to a washing device for a riser of a nautical oil-gas well and belongs to the technical field of riser washing equipment. The washing device for the riser is composed of upper joints, a lower joint, a center cylinder, a shuttle valve, a starting valve and a joint case. One end of the center cylinder are connected to the upper joint in a threaded mode and the lower joint headis insertedly connected to the other end of the center cylinder. A shuttle cavity is arranged in the center cylinder and a shuttle valveis movably installed in the shuttle cavity. The starting valve is movably installed in the upper joint at one side of the shuttle valve through restoring springs. Sealed holes are formed in the upper joints of two sides of the starting valve and sealed balls are movably installed in the sealed holes through sealed springs. According to the washing device for the riser, with the compact structure and artful design, the existing problem of low working efficiencycaused by being prone to