A completion component with position detection

Abstract

The present invention relates to a completion component having a circumference for insertion into a well tubular structure, comprising a tubular base part having an axial extension and a thickness and being adapted to be mounted as part of the well tubular structure, and a displaceable part having a thickness and being displaceable in relation to the tubular base part from a first position to a second position, wherein the tubular base part comprises a plurality of first markers and the displaceable part comprises a second marker for determining a position of the displaceable part in relation to the tubular base part, the first and second markers being arranged with a marker distance, wherein the first markers are different in geometrical size or material, or arranged with a varying mutual distance. The present invention also relates to a downhole system and to a method for determining a position of a displaceable part of a completion component according to the present invention in relation to a tubular base part.

1 . A completion component having a circumference for insertion into a well tubular structure, comprising:
 a tubular base part having an axial extension and a thickness and being adapted to be mounted as part of the well tubular structure, and   a displaceable part having a thickness and being displaceable in relation to the tubular base part from a first position to a second position,   
       wherein the tubular base part comprises a plurality of first markers and the displaceable part comprises a second marker for determining a position of the displaceable part in relation to the tubular base part, the first and second markers being arranged with a marker distance, 
       wherein the first markers are different in geometrical size or material, or arranged with a varying mutual distance. 
     
     
         2 . A completion component according to  claim 1 , wherein the first markers are passive non-inducing markers. 
     
     
         3 . A completion component according to  claim 1 , wherein the first markers are grooves in the tubular base part. 
     
     
         4 . A completion component according to  claim 3 , wherein the grooves have different depths and/or different extensions in the axial extension. 
     
     
         5 . A completion component according to  claim 1 , wherein the markers are ring-shaped. 
     
     
         6 . A completion component according to  claim 1 , wherein the displaceable part is made of a ferromagnetic, non-magnetic material. 
     
     
         7 . A completion component according to  claim 1 , wherein the markers are made of a ferromagnetic, non-magnetic material. 
     
     
         8 . A completion component according to  claim 1 , wherein the markers are made of a material which is different from that of the displaceable part. 
     
     
         9 . A completion component according to  claim 1 , wherein one first marker is made of a different ferromagnetic, non-magnetic material than another first marker. 
     
     
         10 . A completion component according to  claim 1 , wherein the first markers are arranged at a first position along the circumference of the completion component and the second marker is arranged at an angle (a) along the circumference from the first marker. 
     
     
         11 . A completion component according to  claim 1 , wherein the completion component comprises a projecting element which is connected with either the tubular base part or the displaceable part and is adapted to engage grooves in the other part. 
     
     
         12 . A downhole system comprising:
 a well tubular structure,   a completion component having a circumference for insertion into a well tubular structure, comprising:
 a tubular base part having an axial extension and a thickness and being adapted to be mounted as part of the well tubular structure, and 
 a displaceable part having a thickness and being displaceable in relation to the tubular base part from a first position to a second position, 
 wherein the tubular base part comprises a plurality of first markers and the displaceable part comprises a second marker for determining a position of the displaceable part in relation to the tubular base part, the first and second markers being arranged with a marker distance, and 
   a detection tools having a detection unit for detecting a marker distance between the first markers of the tubular base part and the second marker of the displaceable part, wherein the detection unit comprises a first detector having a first detection range (d 1 ) in the axial extension and a second detector having a second detection range (d 2 ) in the axial extension, the first and second detection ranges defining a common detection range (d c ) in the axial direction, the common detection range being larger than the marker distance between the first and second markers independently of the position of the displaceable part in relation to the tubular base part.   
     
     
         13 . A downhole system according to  claim 12 , wherein the distance between the first and second markers is detected independently of a velocity of the detection tool. 
     
     
         14 . A downhole system according to  claim 12 , wherein the detection unit comprises intermediate detectors arranged between the first and second detectors. 
     
     
         15 . A downhole system according to  claim 12 , wherein the detectors are magnetometers. 
     
     
         16 . A downhole system according to  claim 15 , wherein the magnetometers detect changes in the magnitude and/or direction of the magnetic field. 
     
     
         17 . A downhole system according to  claim 12 , wherein the detector unit comprises a plurality of magnets functioning as an inducing device. 
     
     
         18 . A downhole system according to  claim 17 , wherein the magnets of the detector unit have a magnetic field source axis substantially transverse to the longitudinal tool axis. 
     
     
         19 . A downhole system according to  claim 12 , wherein the first markers of the displaceable part of the completion component are passive non-inducing markers. 
     
     
         20 . A method for determining a position of a displaceable part of a completion component according to  claim 1  in relation to a tubular base part, comprising the steps of:
 arranging a first marker in connection with the tubular base part, 
 arranging an additional first marker in connection with the tubular base part at a predetermined distance from the other first marker, 
 arranging a second marker in connection with the displaceable part, and 
 moving a detection tool having a detection unit past the first and second markers in order to detect the first and second markers simultaneously and hence to detect a marker distance between the first and second markers independently of a velocity of the detection tool.