Abstract:

In order to solve some difficult problems in the design of spherical BOP,the author in this paper uses the similitude method to analyse and study the phenomena of rubber core deformation of spherical BOP,and offers the similitude design criteria of spherical BOP.While testing the NL Shaffer s spherical BOP series,he also finds that the design parameters of their preventers from low to high pressure conform to the similitude design criteria.Therefore,the similitude criteria can be applied not only in the design and manufacture of the new type but also in the design of the higher pressure of the same type.

Key words: Blowout preventer(BOP), Design, Similitude