Patent ID: 8955593
Filing Date: 2015-02-17
Classification: E21B

Abstract:
1. A damping sleeve comprising a bipartite structure with a cylindrical shape, provided with a core which extends coaxially from one end to the other of said structure, the core having a substantially cylindrical shape, with a diameter which is equal to or greater than the external diameter of a riser, the structure of the damping sleeve is demarcated in specific tracts: a main body which comprises an upper part and an intermediary part, and, a lower tract formed by a damping ring; the upper part, conically shaped, equivalent to that of the lower external end of a bend stiffener, in which it is directly encased, and the intermediary part is provided with a cavity along the whole internal circumference of the core; said cavity, in turn, is provided with a compression plug, firmly fitted to the riser; the lower tract, formed by the damping ring, is directly fixed on the lower end of the intermediary part; said damping ring follows the shape of the main body of the damping sleeve and has a length which is equivalent to at least ⅓ of the total length of the damping sleeve; the upper part of the main body is also provided with four lugs, distributed equally around its external edge.