A valve and a method for closing fluid communication between a well and a production string, and a system comprising the valve.

Abstract

A valve (1), a system (100) comprising the valve (1) and a method for closing fluid communication between a well (W) and a production string (PS) when a content of an undesired fluid in the fluid flow exceeds a predetermined level, the valve (1) comprising: a primary flow channel (3) having a primary inlet (5) through a flow barrier (7), and a low pressure portion (5'); a secondary flow channel (9) connected to the primary flow channel (3) at the low pressure portion (5'), the secondary flow channel (9) having a secondary inlet (11) through the flow barrier (7) and provided with a flow restrictor (13); - a chamber (17) in connection with the secondary flow channel (9); - a piston (20) arranged in the primary flow channel (3) for opening and closing the primary flow channel (3), the piston (20) defining a portion (22) of the chamber (17) in connection with the secondary flow channel (9); an inflow control element (30) movable between a first position and a second position in response to a density of a fluid; wherein the inflow control element (30) is exposed to the fluid flow upstream of the flow barrier (7) and is arranged to move to the second position and close the secondary inlet (11) when the con-tent of the undesired fluid in the flow upstream of the flow barrier (7) exceeds the predetermined level; and wherein the closing of the secondary inlet (11) causes an underpressure in the chamber (17) such that the piston (20) is activated and the valve (1) is closed.