Mobile rig

Abstract

The present invention is directed to a drilling rig base and a lower mast section that are collapsible into a compact transportable position. The base is expandable in the field to support a drilling platform and all necessary equipment, and the telescoping mast is also expanable for supporting the crown block and cables of the drawworks. More specifically, the rig of the present invention has a base having a plurality of beams, the outer beams being collapsible to a transportable position for placing on a single truck or trailer, and the A-frame lower mast section which is collapsible to a transportable position for placing on a single truck or trailer.

1 . A mobile, collapsible drilling rig base and drilling platform which comprises: 
 a base having a plurality of parallel beams; the outer beams being collapsible to a transportable position; and    a drilling platform attached to said base that is elevatable above said base.    
     
     
         2 . A mobile, collapsible drilling rig base and drilling platform according to  claim 1  wherein said base has four parallel beams, two outer beams and two inner beams.  
     
     
         3 . A mobile, collapsible drilling rig base and drilling platform according to  claim 2  wherein each of said outer two parallel beams are telescopically connected to one of said inner beams.  
     
     
         4 . A mobile, collapsible drilling rig base and drilling platform according to  claim 2  wherein each of said outer two parrallel beams are connected by a hinge to one of said inner beams.  
     
     
         5 . A mobile, collapsible drilling rig base and drilling platform according to  claim 2  wherein said platform is connected by hinges to said inner beams.  
     
     
         6 . An A-frame lower mast support comprising: 
 a rectangular lower mast section;    four leg beams attached to said mast section by universal joints; and    means to spread said leg beams to a position where the feet of said beams are at a distance significantly greater than the distance between said universal joints.    
     
     
         7 . An A-frame mast support according to  claim 6  wherein said means to spread said leg beams comprises: 
 an expandable diagonal member; and  
 an expandable horizontal member.  
 
     
     
         8 . A rig derrick comprising: 
 an A-frame mast support according to  claim 7;  and    a plurality of mast sections attached to said A-frame mast support.    
     
     
         9 . A mobile drilling rig which comprises: 
 a rig base having a plurality of parallel beams; the outer beams being expandable from a collapsible position to an extended spaced position;    a drilling platform attached to said base that is elevatable above said base;    a rectangular mast base;    four leg beams attached to said mast base by universal joints; and    means to spread said leg beams to a position where the feet of said beams are attached to the expanded outer beams of said rig base.    
     
     
         10 . A mobile drilling rig according to  claim 9  wherein said base has four parallel beams, two outer beams and two inner beams.  
     
     
         11 . A mobile drilling rig according to  claim 10  wherein each of said outer two parallel beams are telescopically connected to one of said inner beams.  
     
     
         12 . A mobile drilling rig according to  claim 10  wherein each of said outer two parallel beams are connected by a hinge to one of said inner beams.  
     
     
         13 . A mobile drilling rig according to  claim 11  wherein each mast leg has a drop leg connected to an inner beam.  
     
     
         14 . A mobile drilling rig according to  claim 12  wherein each mast leg has a drop leg connected to an inner beam.