Downhole sampling tool

Abstract

The present invention relates to a downhole sampling tool for taking out fluid samples of a fluid present in a casing having an internal cross-sectional casing area. The downhole sampling tool comprises a first tool part and a second tool part, a sampling inlet arranged in the first part, and an actuation unit arranged in the second part adapted to move the sampling inlet into contact with the fluid in a first part of the casing area for taking out a fluid sample of the fluid present in that part of the casing area.

1 . A downhole sampling tool ( 1 ) for taking out fluid samples of a fluid ( 2 ) present in a casing ( 3 ) having an internal cross-sectional casing area, the downhole sampling tool comprising
 a first tool part ( 4 ) and a second tool part ( 5 ),   a sampling inlet ( 6 ) arranged in the first part,   a pump unit for sucking the fluid in through the sample inlet, and   an actuation unit ( 7 ) arranged in the second part, adapted to move the sampling inlet into contact with the fluid in a first part of the casing area for taking out a fluid sample of the fluid present in that part of the casing area.   
     
     
         2 . A downhole sampling tool according to  claim 1 , wherein the actuation unit is adapted to move the sample inlet between a retracted and a projected position. 
     
     
         3 . A downhole sampling tool according to  claim 1 , wherein the second tool part comprises a through-going recess ( 18 ) in which the arm member is arranged and projects from. 
     
     
         4 . A downhole sampling tool according to  claim 1 , wherein the actuation unit comprises a hydraulic cylinder for moving the sampling inlet between the retracted and the projected position. 
     
     
         5 . A downhole sampling tool according to  claim 1 , wherein the actuation unit comprises an electrical motor for moving the sampling inlet between the retracted and the projected position. 
     
     
         6 . A downhole sampling tool according to  claim 1 , wherein the sampling inlet is arranged in an outer surface of the first tool part. 
     
     
         7 . A downhole tool according to  claim 2 , wherein the first tool part comprises a plurality of sampling inlets. 
     
     
         8 . A downhole sampling tool according to  claim 1 , wherein the first tool part is an arm member ( 8 ) movably connected with the second tool part. 
     
     
         9 . A downhole sampling tool according to  claim 4 , wherein the arm member comprises the sampling inlet. 
     
     
         10 . A downhole sampling tool according to  claim 5 , wherein the arm member comprises a fluid channel ( 10 ) extending between the sampling inlet and an opening ( 30 ) arranged in an opposite end ( 31 ) of the arm member in relation to the sampling inlet. 
     
     
         11 . A downhole sampling tool according to  claim 1 , wherein the actuation unit is adapted to rotate the first tool part. 
     
     
         12 . A downhole sampling tool according to  claim 4 , wherein the second tool part comprises a recess ( 18 ) in which the arm member is arranged and projects from. 
     
     
         13 . A downhole sampling tool according to  claim 1 , wherein the actuation unit comprises an anchor unit ( 52 ) adapted to move the second tool part in a radial direction of the sampling tool. 
     
     
         14 . A downhole sampling tool according to  claim 1 , wherein the first tool part comprises a first arm part ( 41 ) and a second arm part ( 42 ) rotatably connected at one end, the first arm part being securely rotatably connected to the second tool part at the opposite end, and the second arm part being axially movably arranged in the second tool part at the opposite end. 
     
     
         15 . A downhole sampling tool according to  claim 10 , wherein the sampling inlet is arranged at the one end where the first and second arm parts are rotatably connected. 
     
     
         16 . A downhole sampling tool according to  claim 1 , further comprising a pump ( 9 ) being in fluid communication with the sampling inlet. 
     
     
         17 . A downhole sampling tool according to  claim 1 , further comprising a sample chamber ( 19 ) being in fluid communication with the sampling inlet. 
     
     
         18 . A downhole sampling tool according to  claim 1 , further comprising sample testing equipment ( 11 ) being in fluid communication with the sampling inlet for performing a sample test on the fluid sample. 
     
     
         19 . A downhole sampling tool according to  claim 1 , wherein the sampling tool comprises a capacitance measuring unit ( 50 ) for identifying the phase of the fluid, such as gas ( 21 ) and water ( 23 ).