Formation penetrating tool

Abstract

The present invention relates to a formation penetrating tool submersible into a casing in a well for hydraulically penetrating a formation and having a longitudinal tool axis, comprising a tool housing, a supply hose, slidable in the tool housing, for supplying a high pressurised fluid to a nozzle, and the tool housing having an opening through which the supply hose and the nozzle are led to penetrate the formation, wherein the formation penetrating tool further comprises a pump arranged in the tool housing, the pump being in fluid communication with the supply hose for providing a jet of fluid out of the nozzle for penetrating the formation. Furthermore, the invention relates to a downhole system comprising a formation penetrating tool according to the invention and to a method for hydraulically penetrating a formation.

1 .- 23 . (canceled) 
     
     
         24 . A formation penetrating tool ( 1 ) submersible into a casing ( 2 ) in a well ( 3 ) for hydraulically penetrating a formation and having a longitudinal tool axis, comprising:
 a tool housing ( 4 ),   a supply hose ( 8 ), slidable in the tool housing, for supplying a high pressurised fluid ( 9 ) to a nozzle ( 10 ), and   the tool housing having an opening ( 11 ) through which the supply hose and the nozzle are led to penetrate the formation,   
       wherein the formation penetrating tool further comprises a pump ( 12 ) arranged in the tool housing, the pump being in fluid communication with the supply hose for providing a jet ( 13 ) of fluid out of the nozzle for penetrating the formation. 
     
     
         25 . A formation penetrating tool according to  claim 24 , wherein a holding unit ( 14 ) is arranged for providing a predetermined pushing force to the supply hose. 
     
     
         26 . A formation penetrating tool according to  claim 25 , wherein the holding unit comprises a piston ( 15 ) circumferenting the supply hose. 
     
     
         27 . A formation penetrating tool according to  claim 26 , wherein the piston is arranged in a slidable manner in a piston cylinder in the tool. 
     
     
         28 . A formation penetrating tool according to  claim 26 , wherein several annular pistons are provided circumferenting the supply hose. 
     
     
         29 . A formation penetrating tool according to  claim 24 , further comprising a casing penetrating unit ( 5 ) adapted to provide a hole ( 6 ) in a wall ( 7 ) of the casing. 
     
     
         30 . A formation penetrating tool according to  claim 29 , wherein the casing penetrating unit is arranged in connection with or around the nozzle. 
     
     
         31 . A formation penetrating tool according to  claim 30 , wherein the nozzle has a first end ( 101 ) connected with the hose and the casing penetrating unit is a punch provided in a second end ( 102 ) of the nozzle opposite the first end. 
     
     
         32 . A formation penetrating tool according to  claim 24 , wherein the supply hose is sliding in a fluid channel ( 20 ) being in fluid communication with the pump. 
     
     
         33 . A formation penetrating tool according to  claim 24 , wherein the tool housing comprises an inlet ( 21 ) for the well fluid, the inlet being in fluid communication with the pump. 
     
     
         34 . A formation penetrating tool according to  claim 24 , further comprising a moving device ( 50 ) for moving at least the supply hose along the longitudinal tool axis and transverse to the longitudinal tool axis. 
     
     
         35 . A formation penetrating tool according to  claim 24 , wherein a fluid control device ( 24 ) is arranged in connection with the fluid reservoir. 
     
     
         36 . A downhole system comprising a formation penetrating tool according to  claim 24  and a driving unit ( 31 ), such as a downhole tractor. 
     
     
         37 . A downhole system according to  claim 36 , wherein the driving unit is a self-propelling unit capable of conveying itself and the formation penetrating unit forward in the well. 
     
     
         38 . A downhole system according to  claim 36 , wherein the driving unit comprises wheels arranged ( 60 ) on wheel arms ( 61 ) projectable from the tool housing so that the wheel contacts an inner surface of the well. 
     
     
         39 . A method for hydraulically penetrating a formation comprising the steps of
 submerging a formation penetrating tool in a casing,   providing an opening in a wall of the casing by means of a casing penetrating unit,   supplying a high pressurised fluid to a nozzle via a supply hose by means of a pump arranged in the formation penetrating tool,   positioning the nozzle opposite the opening in the casing, and   penetrating the formation by means of a jet of fluid out of the nozzle, providing a formation bore.   
     
     
         40 . A method according to  claim 39 , further comprising at least one of the following steps:
 taking well fluid surrounding the tool in through a inlet in the tool housing, and   pressurising the fluid to a high pressure before supplying the fluid to the supply hose.   
     
     
         41 . A method according to  claim 39 , wherein the formation penetrating tool is a wireline tool being submerged into the well via a wireline. 
     
     
         42 . A method according to  claim 39 , wherein the high pressurised fluid is well fluid. 
     
     
         43 . A method according to  claim 39 , further comprising at least one of the following steps:
 performing a subsequent treatment of the formation bore by means of acid for creating a larger surface area of the formation bore,   injecting a fluid comprising enzymes into the formation bore,   fracturing the formation by injecting high pressurised fluid into the formation bore, or   perforating the formation by exploding a charge in connection with the formation bore.