Tool with a base element and studs provided thereon and use of such tool for forming secant walls

Abstract

The invention relates to a tool (11) comprising a base element (2), which is a single-piece cast structure made of cast iron and comprising studs (3, 4) provided on the base element (2) by welding. The invention further relates to a method for forming such a tool and to the use of such a tool for forming secant walls.

1 . Tool ( 11 ) comprising a base element ( 2 ) and studs ( 3 ,  4 ) provided on the base element ( 2 ), characterised in that the base element ( 2 ) is a single-piece cast structure made of cast iron, and in that the studs ( 3 ,  4 ) are provided on the base element ( 2 ) by welding. 
     
     
         2 . Tool ( 11 ) according to  claim 1 , characterised in that the studs ( 3 ,  4 ) are made of a composition comprising tungsten and/or tungsten carbide. 
     
     
         3 . Tool ( 11 ) according to  claim 1 , characterised in that the studs ( 3 ,  4 ) are provided on the base element ( 2 ) by spot welding. 
     
     
         4 . Tool ( 11 ) according to  claim 1 , characterised in that the tool ( 11 ) is a drill tool. 
     
     
         5 . Tool ( 11 ) according to  claim 4 , characterised in that the drill tool is a casing shoe ( 1 ). 
     
     
         6 . Drill assembly ( 14 ) comprising:
 a drill pipe ( 7 ); and   a tool ( 11 ), which tool ( 11 ) at a first end ( 8 ) is provided to be connected to an end ( 10 ) of the drill pipe ( 7 ) and at a distal end ( 9 ), opposite to the first end ( 8 ) is provided with studs ( 3 ,  4 );   
       characterised in that the tool ( 11 ) is a drill tool according to  claim 4 . 
     
     
         7 . Method for forming a tool ( 11 ) according to  claim 1 , characterised in that the method comprises the following steps:
 a. casting of the base element ( 2 ) from cast iron as a single-piece cast structure; and   b. welding of studs ( 3 ,  4 ) to the base element ( 2 ).   
     
     
         8 . Method according to  claim 7 , characterised in that the base element ( 2 ) is provided with application surfaces ( 5 ,  6 ) for welding the studs ( 3 ,  4 ) to the application surfaces ( 5 ,  6 ) and in that between steps a and b, these application surfaces ( 5 ,  6 ) are finished for welding the studs ( 3 ,  4 ) to the application surfaces ( 5 ,  6 ). 
     
     
         9 . Use of a tool in a drilling assembly according to  claim 6 , characterized in that a tool ( 11 ), which is a casing shoe ( 1 ) drill tool is used for forming secant walls. 
     
     
         10 . Use of a tool according to  claim 9 , characterized in that the tool ( 11 ) is a casing shoe ( 1 ).