Abstract: A valve is for closing fluid communication between a horizontal or deviated well and a production string when a content of a first or a second undesired fluid in the fluid flow exceeds a predetermined level. The valve has a primary flow channel, and a piston arrangement movable within the valve between an inactive position allowing fluid flow through the primary channel and an active position preventing fluid flow through the primary channel. The piston arrangement further has a secondary flow channel and a bypass flow channel and inflow control elements exposed to the fluid flow upstream of the flow barrier and having different density and movable within independent paths in response to a density of fluid.

Abstract: A valve, a system and a method are for closing fluid communication between a well and a production string when a content of an undesired fluid in the fluid flow exceeds a predetermined level. The valve has a primary flow channel having a primary inlet through a flow barrier, and a low pressure portion; a secondary flow channel having a secondary inlet through the flow barrier and provided with a flow restrictor; a chamber connected to the secondary flow channel; a piston for opening and closing the primary flow channel; and an inflow control element movable in response to a density of a fluid. The inflow control element is exposed to the fluid flow upstream of the flow barrier and moves to close the secondary inlet when the content of the undesired fluid exceeds the predetermined level, activating the piston and closing the valve.

Abstract: A valve is for closing fluid communication between a horizontal or deviated well and a production string when a content of a first or a second undesired fluid in the fluid flow exceeds a predetermined level. The valve has a primary flow channel, and a piston arrangement movable within the valve between an inactive position allowing fluid flow through the primary channel and an active position preventing fluid flow through the primary channel. The piston arrangement further has a secondary flow channel and a bypass flow channel and inflow control elements exposed to the fluid flow upstream of the flow barrier and having different density and movable within independent paths in response to a density of fluid.

Abstract: A valve, a system and a method are for closing fluid communication between a well and a production string when a content of an undesired fluid in the fluid flow exceeds a predetermined level. The valve has a primary flow channel having a primary inlet through a flow barrier, and a low pressure portion; a secondary flow channel having a secondary inlet through the flow barrier and provided with a flow restrictor; a chamber connected to the secondary flow channel; a piston for opening and closing the primary flow channel; and an inflow control element movable in response to a density of a fluid. The inflow control element is exposed to the fluid flow upstream of the flow barrier and moves to close the secondary inlet when the content of the undesired fluid exceeds the predetermined level, activating the piston and closing the valve.

Abstract: An apparatus and a method are for controlling a fluid flow in, into or out of a well. An orientation means is for orienting the apparatus in the well. The apparatus has a main flow channel; a chamber in fluid communication with the main flow channel, and having a flow control element movable between a first non-blocking position and a second blocking position for the fluid flow. The flow control element is movable in response to density of fluid in the chamber. The main flow channel has with pressure changing means causing a pressure differential in a fluid return conduit providing fluid communication between the chamber and a portion of the main flow channel, so that fluid in said chamber is recirculated back to the main flow channel when the main flow channel is open.

Abstract: An apparatus and a method are for controlling a fluid flow in, into or out of a well. An orientation means is for orienting the apparatus in the well. The apparatus has a main flow channel; a chamber in fluid communication with the main flow channel, and having a flow control element movable between a first non-blocking position and a second blocking position for the fluid flow. The flow control element is movable in response to density of fluid in the chamber. The main flow channel has with pressure changing means causing a pressure differential in a fluid return conduit providing fluid communication between the chamber and a portion of the main flow channel, so that fluid in said chamber is recirculated back to the main flow channel when the main flow channel is open.