Downhole wireline machining tool string

Abstract

The present invention relates to a downhole wireline machining tool string for increasing an inner diameter of a well tubular metal structure in a well. The downhole wireline machining tool string has a longitudinal axis and comprises a rotatable tool part comprising a machining tool having a first end part, a second end part, a diameter and a circumference, and a stationary tool part comprising a driving unit configured to rotate the rotatable tool part and powered through the wireline. The machining tool comprises a body having an outer face, and the machining tool further comprising a plurality of inserts, each insert having a length along the longitudinal axis, and the inserts projecting from the outer face of the body and being distributed around the circumference. Furthermore, the present invention relates to a machining tool for increasing an inner diameter of a well tubular metal structure in a well or cutting out a piece, e.g. in a downhole valve.

1 . A downhole wireline machining tool string for increasing an inner diameter of a well tubular metal structure in a well, the downhole wireline machining tool string having a longitudinal axis and comprising:
 a rotatable tool part comprising a machining tool having a first end part, a second end part, a diameter and a circumference, and   a stationary tool part comprising:
 a driving unit configured to rotate the rotatable tool part and powered through the wireline, 
   
       wherein the machining tool comprises a body having an outer face, and a plurality of inserts, each insert having a length along the longitudinal axis, and the inserts projecting from the outer face of the body and being distributed around the circumference. 
     
     
         2 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts are fastened directly to the outer face. 
     
     
         3 . A downhole wireline machining tool string according to  claim 1 , wherein the machining tool is an abrasive machining tool. 
     
     
         4 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts are abrasive inserts. 
     
     
         5 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts are fastened directly to the outer face without any support/backing, such as a steel support. 
     
     
         6 . A downhole wireline machining tool string according to  claim 1 , wherein the machining tool has a bore arranged coincident with a centre axis of the machining tool around which the rotatable tool part rotates. 
     
     
         7 . A downhole wireline machining tool string according to  claim 1 , wherein each insert has a width which is less than 40% of the length. 
     
     
         8 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts are distributed along the circumference with a mutual distance being at least the width of one insert. 
     
     
         9 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts incline towards at least one of the first and second end parts. 
     
     
         10 . A downhole wireline machining tool string according to  claim 1 , wherein the second end part has a decreasing outer diameter, and at least part of the inserts extends at least partly along part of the second end part having the decreasing outer diameter. 
     
     
         11 . A downhole wireline machining tool string according to  claim 1 , wherein the inserts are arranged in at least a first row and a second row extending along the circumference, and the first row and the second row of inserts are arranged in succession along the longitudinal axis. 
     
     
         12 . A downhole wireline machining tool string according to any one of the preceding claims, wherein the rotatable tool part rotates less than 300 revolutions per minute (RPM). 
     
     
         13 . A downhole wireline machining tool string according to  claim 1 , wherein the driving unit is powered by less than 7,000 watt. 
     
     
         14 . A downhole wireline machining tool string according to  claim 1 , wherein the machining tool further comprises a fastening element for fastening a machined piece, the body with inserts being rotatable in relation to the fastening element. 
     
     
         15 . A downhole wireline machining tool string for increasing an inner diameter of a well tubular metal structure in a well or cutting out a piece, e.g. in a downhole valve, the downhole wireline machining tool string having a longitudinal axis and comprising:
 a rotatable tool part comprising a machining tool having a first end part, a second end part, a diameter and a circumference, and   a stationary tool part comprising:
 a driving unit configured to rotate the rotatable tool part and powered through the wireline, 
   
       wherein the machining tool comprises a body having an outer face and a fastening element for fastening a machined piece. 
     
     
         16 . A downhole wireline machining tool string according to  claim 14 , wherein the body being rotatable within or around the fastening element. 
     
     
         17 . A downhole wireline machining tool string according to  claim 14 , wherein the fastening element comprises a base part and a projecting part, the projecting part being more flexible than the base part. 
     
     
         18 . A downhole wireline machining tool string according to  claim 14 , wherein the machining tool further comprises a core drill having a circumferential wall with inserts, said circumferential wall circumferenting the body and being part of the rotatable tool part. 
     
     
         19 . A machining tool for increasing an inner diameter of a well tubular metal structure in a well or cutting out a piece, e.g. in a downhole valve, comprising:
 a body,   an insert forming a drill bit,   a fastening element circumferenting the body, and   a core drill having a circumferential wall with inserts, said circumferential wall circumferenting the body.   
     
     
         20 . A machining tool according to  claim 19 , wherein the body being rotatable within or around the fastening element.