Method and device for closing a well

Abstract

A method and device close a well with a casing in a formation in the ground are provided. The method has the steps of moving a cutting tool down into the well; removing a longitudinal portion of the casing by cutting the longitudinal portion into pipe wall pieces; removing the cutting tool; and setting a plug against the formation in the longitudinal portion from which the casing has been removed.

1 . A method of closing a well in a formation in ground in which a casing is arranged, the method comprising the steps of:
 moving a cutting tool down into the well;   cutting openings across a longitudinal portion of the casing;   removing the cutting tool; and   filling a curable mass into the casing , wherein the curable mass flows through the openings, filling a space between the casing and the formation to form a full cross-sectional plug, wherein the pipe wall pieces remain in the wall.   
     
     
         2 . The method in accordance with  claim 1 , further comprising the step of cutting the openings via a fluid jet. 
     
     
         3 . (canceled) 
     
     
         4 . The method in accordance with  claim 1 , further comprising the step of:
 filling a lower portion of the well with a filler;   cutting an inner casing at a lower position in the well than a position at which the longitudinal portion is located; and removing an upper portion of the inner casing.   
     
     
         5 . The method in accordance with  claim 1 , further comprising the step of connecting the cutting tool to a surface of the well via coiled tubing. 
     
     
         6 . A cutting tool for closing a well in a formation in ground in which a casing is arranged, the tool comprising a nozzle head rotatable around its longitudinal axis, with at least one nozzle, where the nozzle head is connected to coiled tubing, the coiled tubing extending to a surface of the well, and the cutting tool being connected to the casing by an anchor. 
     
     
         7 . The cutting tool of  claim 6 , wherein the anchor is a rolling anchor. 
     
     
         8 . (canceled) 
     
     
         9 . The cutting tool of  claim 6 , wherein the nozzle head is provided with a pendulum nozzle. 
     
     
         10 . The cutting tool of  claim 6 , wherein the cutting tool is provided with a change-over valve which is arranged to selectably connect a fluid flow to a desired nozzle.