Downhole flow control device and method

A downhole flow control method, comprising:

• providing flow in a first direction through a flow control device within a wall of a tubular, wherein flow in said first direction locates a regulator member within the flow control device in a first position to provide a first restriction to flow;
• and
• subsequently providing flow in a reverse second direction through the flow control device, wherein flow in said second direction locates the regulator member in a second position to provide a second restriction to flow, wherein the first and second restrictions to flow are different;
• wherein the flow control device comprises an opening arrangement for permitting flow into or from a flow path of a body according to flow direction, wherein the opening arrangement provides the second restriction to flow and is provided on a replaceable nozzle mounted on the body, wherein the replaceable nozzle sealingly engages the regulator member in the first position.

A downhole flow control method, comprising:

• providing flow in a first direction through multiple flow control devices axially arranged within a wall of a tubular, wherein flow in said first direction locates a regulator member within each flow control device in a first position to provide a first restriction to flow;
• and
• subsequently providing flow in a reverse second direction through the flow control devices, wherein flow in said second direction locates the regulator members in a second position to provide a second restriction to flow, wherein the first and second restrictions to flow are different;
• wherein the flow control device comprises an opening arrangement for permitting flow into or from a flow path of a body according to flow direction, wherein the opening arrangement provides the second restriction to flow and is provided on a replaceable nozzle mounted on the body, wherein the replaceable nozzle sealingly engages the regulator member in the first position.