Device for Operating Downhole Equipment

Abstract

There is provided A device for conveying a pressure pulse for activating fluid-activated equipment in a pipe ( 12/27 ), wherein the device is characterized in that the pipe ( 27 ) comprises a flexible membrane ( 24 ) which isolates the fluid F 1 in the fluid conveying pipe from a fluid F 2 in another canal which is in fluid communication with the equipment, wherein the membrane, on account of its elasticity, conveys pressure changes (pressure pulses) in the fluid P 1 in the pipe ( 12 ) to the fluid P 2 in the other canal ( 30 ). Beneficially, the other canal ( 30 ) is fluidically coupled to a chamber ( 26 ) wherein the membrane ( 24 ) is located, and the membrane (a bellows) ( 24 ) is threaded to an exterior of the pipe section ( 27 ) and arranged in a chamber-forming ( 26 ) seat of the section of pipe ( 27 ), wherein the wall of the section of pipe includes a number of penetrating bored holes for providing fluid connection from the fluid F 1 having a pressure P 1 in the pipe ( 27 ) radially out towards the membrane lying against the outer wall. The membrane ( 24 ) is beneficially a sleeve-formed bellows, and the chamber forms a ring-formed arrangement surrounding the section of pipe, and the wall of the pipe comprises a number of penetrating bored holes completely around the pipe.

1 - 9 . (canceled) 
     
     
         10 . A device for providing a pressure pulse for activating fluid pressure activated equipment in a fluid conveying pipe, where a section of the pipe wall includes a number of penetrating bores, and a flexible membrane is arranged on the outside of the pipe section,
 said flexible membrane may isolate a fluid F 1  in the fluid-conveying pipe from a fluid F 2  in another canal which is in fluidic communication with the equipment, wherein the membrane, on account of its elasticity, conveys pressure changes in the fluid F 1  in the pipe to the fluid F 2  in the other canal, characterized in that each bore through the pipe section wall defines a central concentric bore, in that each end of the bore forms a conical extension towards the inner wall and the outer wall of the pipe section respectively.   
     
     
         11 . A device as claimed in  claim 10  characterized in that each bore extension has one of a cone shaped form and a substantially trumpet shaped form. 
     
     
         12 . A device as claimed in  claim 10  characterized in that the membrane is a sleeve formed bellows that is threaded onto the outside of a pipe section and arranged in a chamber-forming seat in the pipe section, wherein the wall of the pipe section comprises said number of penetrating bores holes for providing a fluid communication from the fluid F 1  of pressure P 1  in the pipe radially outwardly towards the membrane located outside of the pipe section wall. 
     
     
         13 . A device as claimed in  claim 10  characterized in that the membrane is a sleeve-formed bellows, and the chamber is formed from a ring formed region surrounding the pipe section periphery. 
     
     
         14 . A device as claimed in  claim 10  characterized in that the flexible membrane provides a similar pressure on both sides of the membrane which will contract, expand and contract itself back to its original form after an application of pressure. 
     
     
         15 . A device as claimed in  claim 10  characterized in that a burst-disk is arranged in a bored hole/canal through the wall of the pipe for defining a removable dividing plate between the two fluid regions F 1  and F 2  wherein the regions F 1  and F 2  have pressures P 1  and P 2  respectively. 
     
     
         16 . A device as claimed in  claim 15  characterized in that the burst-disc is operable to break when a given pressure difference between the fluid regions F 1  and F 2  arises for ensuring the system against further pressure differences between the two liquids. 
     
     
         17 . A device as claimed in  claim 16 wherein said given pressure difference is 10 Bar. 
     
     
         18 . A device as claimed in  claim 15  characterized in that the burst-disk is located in a bore hole through the wall at the top of the pipe section where the bellows are mounted, for providing communication in an event that there arises a too high pressure in the fluid F 2  on the backside of the bellows and which is not similar to the pressure P 1  in the fluid F 1  within the pipe.