Wireline intervention tool string

Abstract

The present invention relates to a wireline intervention tool string (1) for operating in a well (2) having a longitudinal axis, a top (51) and a bottom (52), comprising a tool housing (3) having a longitudinal tool axis, a first part connected to a wireline and configured to face the top of the well, the first part comprising an anchoring section (6) and configured to be rotationally stationary during operation, an operational tool (7) configured to rotate relative to the first part during operation, a driving unit (8) arranged in the first part and configured to provide rotational force to the operational tool, the driving unit being powered via the wireline, and a vibration-generating unit (9) for providing vibration force to the operational tool, wherein the wireline intervention tool string further comprises a vibration-dampening unit (10) arranged in a longitudinal position uphole relative to the operational tool for preventing vibrations generated by the vibration-generating unit from releasing tool sections from other tool sections of the wireline intervention tool string, at least in the first part. The invention also relates to downhole tool system comprising the wireline intervention tool string and a driving section/downhole tractor (15).

1 .- 15 . (canceled) 
     
     
         16 . A wireline intervention tool string for operating in a well having a longitudinal axis, a top and a bottom, comprising:
 a tool housing having a longitudinal tool axis,   a first part connected to a wireline and configured to face the top of the well, the first part comprising an anchoring section and being configured to be rotationally stationary during operation,   an operational tool configured to rotate relative to the first part during operation,   a driving unit arranged in the first part and configured to provide rotational force to the operational tool, the driving unit being powered via the wireline, and   a vibration-generating unit for providing vibration force to the operational tool,   
       wherein the wireline intervention tool string further comprises a vibration-dampening unit arranged in a longitudinal position uphole relative to the operational tool for preventing vibrations generated by the vibration-generating unit from damaging tool sections that are uphole to the operational tool and/or to prevent the vibration generated by the vibration-generating unit from releasing tool sections from other tool sections of the wireline intervention tool string, at least in the first part. 
     
     
         17 . A wireline intervention tool string according to  claim 16 , wherein the wireline intervention tool string comprises a second part configured to face the bottom of the well, and the operational tool is arranged in the second part of the wireline intervention tool string, the operational tool comprising a bit for machining, such as grinding and/or milling. 
     
     
         18 . A wireline intervention tool string according to  claim 16 , wherein the vibration-generating unit provides oscillating vibration force at a frequency of more than 50 Hz, or more preferably of more than 100 Hz, or even more preferably of more than 200 Hz. 
     
     
         19 . A wireline intervention tool string according to  claim 16 , wherein the vibration-dampening unit is arranged in a longitudinal position between the operational tool and the first part. 
     
     
         20 . A wireline intervention tool string according to  claim 16 , wherein the vibration-dampening unit is configured to be stationary during operation. 
     
     
         21 . A wireline intervention tool string according to  claim 16 , wherein the vibration-dampening unit is configured to rotate relative to the first part during operation. 
     
     
         22 . A wireline intervention tool string according to  claim 16 , wherein the driving unit is configured to provide rotational force to the vibration-generating unit, where the vibration-generating unit is configured to transform the rotational force into the vibration force in the longitudinal tool axis. 
     
     
         23 . A wireline intervention tool string according to  claim 16 , further comprising a second driving unit that is configured to provide rotational force to the vibration-generating unit, where the vibration-generating unit is configured to transform the rotational force into the vibration force. 
     
     
         24 . A wireline intervention tool string according to  claim 16 , wherein the wireline intervention tool string further comprises a gearing unit arranged in a longitudinal position between the driving unit and the operational tool and/or between the driving unit and the vibration-generating unit. 
     
     
         25 . A wireline intervention tool string according to  claim 24 , wherein the gearing unit is configured to provide a first rotational speed to the operational tool and/or a second rotational speed to the vibration-generating unit, where the first rotational speed is different from the second rotational speed. 
     
     
         26 . A wireline intervention tool string according to  claim 16 , wherein the vibration-generating unit provides oscillating vibration force in a direction that is parallel, coaxial and/or coincident to the longitudinal tool axis of the wireline intervention tool string and/or the longitudinal axis of the well. 
     
     
         27 . A wireline intervention tool string according to  claim 16 , wherein the vibration-generating unit is arranged in a longitudinal position between the vibration-dampening unit and the operational tool. 
     
     
         28 . A wireline intervention tool string according to  claim 16 , wherein the vibration-generating unit comprises a wave bearing or a magnetostrictive oscillator providing the vibration force. 
     
     
         29 . A wireline intervention tool string according to  claim 16 , wherein the vibration-generating unit comprises a vibration-transmission unit ( 30 ) comprising a spring system. 
     
     
         30 . A downhole tool system comprising the wireline intervention tool string according to  claim 16  and a driving section/downhole tractor.