Drilling or Service Rig

Abstract

A drilling or service rig ( 1 ) for use in operations on- or offshore, the rig ( 1 ) being formed by a derrick structure ( 3 ) projecting from a foundation ( 11 ) and being arranged to receive a carriage ( 7 ), movable along the longitudinal axis of the derrick structure, for a drilling or service device ( 17 ), the carriage ( 7 ) being arranged to carry out, under the influence of at least one double-acting hydraulic cylinder ( 9, 15 ), a relative movement along the longitudinal axis of the derrick structure ( 3 ), and at least one of the at least one cylinder being formed by a double-acting, telescopic cylinder ( 9 ) which is arranged to exert both a push force and a pull force on the carriage ( 7 ), whereby the said carriage ( 7 ) is moved respectively away from or towards the foundation ( 11 ) of the rig.

1 . A drilling or service rig ( 1 ) for use in operations on- or offshore, the rig ( 1 ) being formed by a derrick structure ( 3 ) projecting from a foundation ( 11 ) and being arranged to receive a carriage ( 7 ), movable along the longitudinal axis of the derrick structure, for a drilling or service device ( 17 ), the carriage ( 7 ) being arranged to be moved, under the influence of at least one double-acting hydraulic cylinder ( 9 ,  15 ), along the longitudinal axis of the derrick structure ( 3 ) away from or towards the foundation ( 11 ) of the rig ( 1 ), characterized in that the derrick structure ( 3 ) is telescopically movable. 
   
   
       2 . The drilling or service rig in accordance with  claim 1 , characterized in that the at least one hydraulic cylinder ( 9 ,  15 ) is placed on an external side of the derrick structure ( 3 ). 
   
   
       3 . The drilling or service rig in accordance with  claim 2 , characterized in that the rig ( 1 ) is arranged to be tilted in the vertical plane and/or pivoted in the horizontal plane. 
   
   
       4 . The drilling or service rig in accordance with any one of the preceding claims, characterized in that the derrick structure ( 3 ) is further provided with at least one conventional cylinder ( 15 ). 
   
   
       5 . The drilling or service rig in accordance with  claim 4 , characterized in that the at least one telescopic cylinder ( 9 ) and the at least one conventional cylinder ( 15 ) are arranged to be controlled individually. 
   
   
       6 . The drilling or service rig in accordance with  claim 4 , characterized in that the at least one telescopic cylinder ( 9 ) and the at least one conventional cylinder ( 15 ) are arranged to be controlled synchronizedly. 
   
   
       7 . The drilling or service rig in accordance with any one of the preceding claims, characterized in that the carriage ( 7 ) is arranged to carry, at the same time, a drilling device ( 17 ) and a service device ( 50 ).