Drilling rig placed on the sea bed and equipped for drilling of oil and gas wells

Abstract

A drilling placed on the seabed and arranged for drilling of oil and gas wells is remote controlled from a light drilling vessel ( 2 ) through pipes and signal cables ( 3 ). The main structure of the drilling rig is made up of two cylindrical structures ( 1 and 10 ), in connection with which there is provided a number of cylindrical silos ( 8 ) for storing drill pipe magazines ( 23 ). A complete drilling module ( 17 ) can be lowered and retrieved through hatchways ( 11 ) at the top of the first cylindrical structure 10 The drilling rig is anchored to a foundation frame ( 7 ) by hydraulic legs ( 9 ). A cylindrical skirt ( 34 ) encloses the BOP ( 33 ) to prevent pollution of the environment

1 . A drilling rig placeable on the seabed and arranged for drilling of oil and gas wells, comprising:
 a drilling module;   at least one drill pipe magazine; and   a watertight cylindrical main structure comprising concentric cylindrical structures and a plurality of silos for storing drill pipes,   wherein upper portions of the cylindrical structures and the silos are provided with corresponding sealing hatchways for passing equipment in and out.   
   
   
       2 . The drilling rig in accordance with  claim 1 , wherein a drilling module comprising a main structure with associated hoisting cylinders plus a drilling machine and a pipe handling robot equipped with hoisting and gripping devices can be displaced through the hatchway associated with a second main structure. 
   
   
       3 . The drilling rig in accordance with  claim 1 , wherein the drilling rig is provided with a cylindrical skirt arranged to engage a corresponding cylindrical structure on the foundation frame. 
   
   
       4 . The drilling rig in accordance with  claim 1 , wherein the drilling rig is anchored to a foundation frame located on the seabed by a plurality of hydraulic legs.