Flow control screen for use in oilfield exploitation

Abstract

A flow control screen for use in oilfield exploitation comprises: a base pipe ( 1 ) provided with a base pipe inlet ( 11 ) thereon; a filter pipe ( 2 ) sleeved over the base pipe ( 1 ); a flow guide layer ( 3 ) formed between the base pipe and the filter pipe; and a flow control device ( 4 ) including an inlet ( 41 ) of the flow control device, a flow control channel ( 42 ) and an outlet ( 43 ) of the flow control device, wherein the inlet of the flow control device is in fluid communication with the flow guide layer, and the outlet of the flow control device is in fluid communication with the base pipe inlet. The pipe is simply structured and cost-effective, and effectively meets the requirements in oil production.

1 . A flow control screen for use in oilfield exploitation, comprising:
 a base pipe provided with a base pipe inlet thereon;   a filter pipe sleeved over the base pipe such that an annular gap between the base pipe and the filter pipe forms a flow guide layer in which fluid is allowed to flow; and   a flow control device including an inlet of the flow control device, a flow control channel and an outlet of the flow control device, the inlet of the flow control device being in fluid communication with the flow guide layer, and the outlet of the flow control device being in fluid communication with the base pipe inlet;   wherein the filter pipe is configured as a metal pipe provided with a plurality of filter slots on the wall thereof, the metal pipe is made of a metal plate, and at least one inwardly protruding fixed-support is provided on the inner wall of the filter pipe such that the flow guide layer in communication with at least one portion of the plurality of slots is not closed under external pressure around the screen in a formation.   
     
     
         2 . The flow control screen according to  claim 1 , wherein the at least one fixed-support comprises a plurality of fixed-supports, and the plurality of fixed-supports are substantially uniformly distributed on the inner wall of the filter pipe. 
     
     
         3 . The flow control screen according to  claim 2 , wherein each of the fixed-supports is a protruding part fixed to the inner wall of the filter pipe, and the height of each of the protruding parts is set to ensure that the flow guide layer is not closed under the external pressure around the screen in the formation. 
     
     
         4 . The flow control screen according to  claim 2 , wherein each of the fixed-supports is a protruding part inwardly punched on the wall of the filter pipe, and the punching depth of each of the protruding parts is greater than the thickness of the wall of the filter pipe so that the slots are formed in the form of sidewise-slots between portions of the periphery of the top surface of each of the protruding parts and the shearing planes of the unpunched portions of the wall of the filter pipe. 
     
     
         5 . The flow control screen according to  claim 2 , wherein the top surface of each of the fixed-supports is substantially in the shape of quadrangle. 
     
     
         6 . The flow control screen according to  claim 5 , wherein the top surface of each of the fixed-supports is substantially in the shape of square or rectangle. 
     
     
         7 . The flow control screen according to  claim 4 , wherein the top surface of each of the fixed-supports is substantially in the shape of square or rectangle, and the slots are formed in the form of sidewise-slots between two opposite side edges of the top surface of each of the fixed-supports and the shearing planes of the unpunched portions of the wall of the metal pipe. 
     
     
         8 . The flow control screen according to  claim 1 , wherein each of the slots is configured to extend parallel to the longitudinal axis of the filter pipe. 
     
     
         9 . The flow control screen according to  claim 1 , wherein each of the slots is configured to extend at an angle with respect to the longitudinal axis of the filter pipe, and the angle is greater than 0 degree but not more than 90 degrees. 
     
     
         10 . The flow control screen according to  claim 1 , wherein the plurality of slots comprise a plurality of groups of slots, the distribution pattern of which is made such that the slots in each group are equidistantly distributed in the circumferential direction of the filter pipe, and the groups of slots are equidistantly distributed in the longitudinal direction of the filter pipe; or the slots in each group are equidistantly distributed in a spiral direction on the wall of the filter pipe, and the groups of the slots are equidistantly distributed in the circumferential direction of the filter pipe. 
     
     
         11 . The flow control screen according to claim, wherein the filter pipe is a metal pipe formed by welding a spirally wound elongated metal plate preformed with the fixed-supports. 
     
     
         12 . The flow control screen according to  claim 1 , wherein the fixed-supports disposed on the inner wall of the filter pipe are configured so as to ensure that the flow guide layer is still unobstructed under the external pressure around the screen in the formation.