Bellows valve

Abstract

The present invention relates to a device which can be used in an off-shore or onshore oil and/or gas well for the purpose of increasing the production of the well. The device comprises an outer structure in which a first and a second pressure-actuated bellows device are arranged, the first and second pressure-actuated bellows device, via a support means, being in fluid communication with each other. The support means is fixedly mounted internally in the outer structure, the support means thereby delimiting an open and a closed space for respectively the first and the second pressure-actuated bellows device, wherein the closed space is filled with a fluid under pressure, whilst the open space is in fluid communication with a surrounding fluid.

1 . A device, in particular for use in an offshore or onshore oil and/or gas well, comprising an outer structure provided with a bore and a pressure-actuated bellows arranged therein,
 characterised in that the pressure-actuated bellows is formed of a first and a second pressure-actuated bellows device, which first and second pressure-actuated bellows device, via a support means, are in fluid communication with each other, said support means being fixedly mounted internally in the outer structure, so that the support means delimits an open and a closed space for respectively the first and the second pressure-actuated bellows device in the outer structure, which closed space comprises means for pressurizing the closed space, whilst the open space is designed to be in fluid communication with a surrounding fluid.   
     
     
         2 . A device according to  claim 1 ,
 characterised in that in the outer structure a bore is provided.   
     
     
         3 . A device according to  claim 1 ,
 characterized in that the support means is fixedly mounted internally in the bore.   
     
     
         4 . A device according to  claim 1  or  3 ,
 characterised in that the support means forms a closed cylinder, the top and bottom face of the cylinder, via through holes, being connected to the first and the second pressure-actuated bellows device. 
 
     
     
         5 . A device according to  claim 3 ,
 characterised in that internally in the support means at least one piston is provided.   
     
     
         6 . A device according to  claim 3 ,
 characterised in that a delay device is provided in connection with the support means.   
     
     
         7 . A device according to  claim 6 ,
 characterised in that the delay device is a plate comprising at least one through hole.   
     
     
         8 . A device according to  claim 1 ,
 characterised in that at least one stop face internally in the support means delimits the axial movement of the first and the second pressure-actuated bellows device.   
     
     
         9 . A device according to  claim 1 ,
 characterised in that the first and the second pressure-actuated bellows device are made of a metallic, elastomeric or non-metallic material.   
     
     
         10 . A device according to  claim 3 ,
 characterised in that the first and the second pressure-actuated bellows device and the support means are filled with an incompressible fluid.   
     
     
         11 . A device according to  claim 1 ,
 characterised in that a resilient element is arranged around the first and/or second pressure-actuated bellows device.   
     
     
         12 . A device according to  claim 11 ,
 characterised in that the resilient element is a nitrogen package, one or more springs or another biasing device.   
     
     
         13 . A device according to  claim 1 ,
 characterised in that the first and the second pressure-actuated bellows device in a lower stop position are configured to have maximum compression.