Stop-sand liner hanger assembly for water wells

Abstract

A device for gravel packing, particularly designed for water wells, the device having a generally vertical cemented casing ( 1 ) and a stop-sand liner hanger ( 2 ), characterised in that said casing ( 1 ) comprises three elliptical balls ( 13 ) located on the inner surface of the casing ( 1 ) at the same depth level adjacent its bottom. The stop-sand liner hanger ( 2 ) comprises a gravel ports pipe ( 12 ) and a gravel setting tool guide pipe ( 11 ) around which is fixed at the top end an upper external stop-ring ( 4 ), below which are freely adjusted two rubber packers ( 6, 8 ) between a rubber packer protection ring ( 5 ) at the top and a push-up ring ( 9 ) at the bottom. The said rubber packers ( 6, 8 ) are being compressible by the push-up ring ( 9 ) resting on the three elliptical balls ( 13 ) when said push-up ring ( 9 ) is caused to slide up over the gravel setting tool guide pipe ( 11 ) against the downwards action of the weight of underlying screens/liners ( 15, 14 ). This compression increasing the external diameter of the rubber packers ( 6, 8 ) sealing off the annulus ( 3 ) between the cemented casing ( 1 ) and the stop-sand liner hanger ( 2 ).

1 . A device for gravel packing, in particular for water wells, the device having a generally vertical cemented casing ( 1 ) and a stop-sand liner hanger ( 2 ), characterised in that said casing ( 1 ) comprises three bearing elliptical balls ( 13 ) located on the inner surface of the casing ( 1 ) at the same level adjacent its bottom, said stop-sand liner hanger ( 2 ) comprising a gravel ports pipe ( 12 ), and a gravel setting tool guide pipe ( 11 ) around which is fixed at the top end an upper external stop-ring ( 4 ) below which are freely adjusted at least one rubber packer ( 6 ) between an upper rubber packer protection ring ( 5 ) and a push-up ring ( 9 ), said rubber packer ( 6 ) being compressible by the push-up ring ( 9 ) when the latter comes to rest on the three bearing ( 13 ) which produces a relative upwards movement of the push-up ring ( 9 ) over the gravel setting tool guide pipe ( 11 ) against the downwards action of the weight of the stop-sand liner hanger ( 2 ) and underlying screens/liners ( 15 , 14 ), said compression increasing the external diameter of the rubber packer ( 6 ) sealing off the annulus ( 3 ) between the cemented casing ( 1 ) and the stop-sand liner hanger ( 2 ).  
   
   
       2 . A device for gravel packing according to  claim 1 , wherein the gravel ports pipe ( 12 ), which has three gravel ports ( 27 ), contains inside its inner diameter a gravel ports piston ( 20 ) which is placed above a spring case ( 17 ), said piston ( 20 ) resting on a spring ( 18 ) receives in its inside profile a gravel pack setting tool ( 23 ), said spring ( 18 ) being compressed under the weight of the gravel pack setting tool ( 23 ) when the latter is positioned inside the SSLH ( 2 ) causing the downwards movement of the gravel ports piston ( 20 ) and causes the opening of the gravel ports by the juxtaposition of gravel ports ( 27 ) of the pipe ( 12 ) and ports ( 28 ) of said piston ( 20 ).  
   
   
       3 . A device for gravel-packing according to  claim 2 , wherein three guide plates ( 16 ) are fixed at angles of 120° inside the gravel setting tool guide pipe ( 11 ), said guide plates ( 16 ).axially adjust the gravel setting tool gravel ports ( 31 ) with the piston gravel ports ( 28 ).  
   
   
       4 . A device for gravel packing according to  claim 1 , wherein the three elliptical balls ( 13 ) are located at angles of 120°.  
   
   
       5 . A device for gravel packing according to  claim 1  wherein an upper rubber packer ( 6 ) and a lower rubber packer ( 8 ) are freely adjusted around the said gravel setting tool guide pipe ( 11 ), the said upper and lower rubber packers ( 6 ,  8 ) being adjacent to an intermediate rubber packer protection ring ( 7 ) on one side and to respectively an upper rubber packer protection ring ( 5 ) and a push-up ring ( 9 ) on the other side.