Method and apparatus to be carried out on a floating surface installation of the operations of the drilling and interventions in a well underwater

摘要

P the apparatus comprises a principal column 1 detachable from the crown 1 of the well head in a manner totally independent of the auxiliary flexible pipes 3a, 3b, 3c, 3d, which are flexible pipes suspended from the surface installation, independently of the principal column 1 and at a distance that - latter from separate members 4, permitting the continuous movement of these flexible pipes. The length of the latter is adjusted so that they form in water, a plurality of chains supported by the surface installation and connected to the top of the well head, with interposition of stroke-limiting members of the curve 6. / p & & p & application to the operations of offshore drilling. / p