Retrieval tool string

Abstract

The present invention relates to a retrieval tool string for retrieving a fish with a profile facing a top of a well having a well tubular, where the fish is a well component intentionally or unintentionally left in a wellbore such as a plug, a straddle, or a tool, the retrieval tool string comprising a wireline fishing tool having a tool extension and comprising a wireline connection for connection to a wireline, an electric motor powered by the wireline, a first tool part and a second tool part, the first tool part being nearest the wireline connection and comprising the electric motor, and the second tool part comprising a fish profile engagement device for engaging the profile of the fish, wherein the first tool part and the second tool part have a disconnection arrangement for disconnecting the second tool part in the well. The invention also relates to a retrieval method for retrieving a fish in a well.

1 . Retrieval tool string for retrieving a fish with a profile facing a top of a well having a well tubular, where the fish is a well component intentionally or unintentionally left in a wellbore such as a plug, a straddle or a tool, the retrieval tool string comprising:
 a wireline fishing tool having a tool extension and comprising:
 a wireline connection for connection to a wireline, 
 an electric motor powered by the wireline, and
 a first tool part and a second tool part, the first tool part being nearest the wireline connection and comprising the electric motor, and the second tool part comprising a fish profile engagement device for engaging the profile of the fish, 
 
   
       wherein the first tool part and the second tool part have a disconnection arrangement for disconnecting the second tool part in the well. 
     
     
         2 . Retrieval tool string according to  claim 1 , wherein the second tool part further comprises an anchoring part movable from a retracted position to a projected position in which the anchoring part abuts an inner face of the tubular for anchoring the second tool part. 
     
     
         3 . Retrieval tool string according to  claim 1 , wherein the second tool part further comprises an activation element movable axially along the tool extension for activating the anchoring part to move from the retracted position to the projected position. 
     
     
         4 . Retrieval tool string according to  claim 3 , wherein the activation element is connected to or forms part of the second part. 
     
     
         5 . Retrieval tool string according to  claim 3 , wherein the second tool part further comprises a control part for controlling a position of the activation element. 
     
     
         6 . Retrieval tool string according to  claim 5 , wherein the control part comprises a shear pin, a spring or a ratchet mechanism. 
     
     
         7 . Retrieval tool string according to  claim 1 , wherein the fish profile engagement device comprises a first portion and a second portion, the first portion being movable in relation to the second portion or vice versa to fasten the fish profile engagement device in or around the profile. 
     
     
         8 . Retrieval tool string according to  claim 1 , wherein the disconnection arrangement comprises a first part releasably attached to a second part, where the first part is part of the first tool part, and the second part is part of the second tool part. 
     
     
         9 . Retrieval tool string according to  claim 8 , wherein the first part of the disconnection arrangement comprises a first engagement device that is part of the first tool part and engages a second engagement device that is part of the second tool part. 
     
     
         10 . Retrieval tool string according to  claim 9 , wherein the second part of the disconnection arrangement comprises a third engagement device that is part of the first tool part and engages a fourth engagement device that is part of the second tool part. 
     
     
         11 . Retrieval tool string according to  claim 9 , wherein the first engagement device engages the second engagement device by means of a shearing element, such as a shear pin. 
     
     
         12 . Retrieval tool string according to  claim 1 , wherein the second part comprises a first sleeve and the activation element, the first sleeve being connected to the activation element by means of a shear element, such as a shear pin. 
     
     
         13 . Retrieval tool string according to  claim 1 , wherein the wireline fishing tool is a primary tool, and the retrieval tool string further comprises a secondary tool connecting the wireline fishing tool to the wireline. 
     
     
         14 . Retrieval tool string according to  claim 1 , wherein the secondary tool comprises a driving unit for conveying the retrieval tool string down the well, an anchor unit for anchoring the retrieval tool string at a location in the well and/or a stroking unit for providing an axial pulling force on at least the wireline fishing tool. 
     
     
         15 . Retrieval method for retrieving a fish in a well comprising:
 connecting a retrieval tool string according to  any of the preceding claims  to a wireline,   submerging the retrieval tool string down the well,   reaching a fish at a first location in the well,   engaging the fish profile engagement device to the profile of the fish,   pulling the fish for releasing the fish from the well tubular,   moving the retrieval tool string and the fish closer to the top of the well to a second location,   anchoring the second tool part in the well tubular at the second location,   disconnecting the first tool part from the second tool part,   moving the first tool part closer to the top and out of the well, leaving the second tool part at the second location,   entering the well,   connecting the first tool part to the second tool part,   releasing the second tool part from the second location, and   pulling the retrieval tool string and the fish out of the well.