Patent ID: 8827238

Claim:
A downhole flow control device comprising: a body portion with an orifice that allows fluid flow through the orifice; a control portion that changes configurations between a first configuration that allows fluid flow through the orifice and a second configuration that restricts fluid flow through the orifice; a fluid flow controller disposed between the body portion and the control portion; wherein the fluid flow controller comprises at least one annular member disposed in a recess in one of the body portion and the control portion; wherein the fluid flow controller has a leak path that is opened and closed by a pressure differential acting across the at least one annular member; wherein the at least one annular member comprises a first ring with a first split between a first end of the first ring and a second end of the first ring, and a second ring with a second split between a first end of the second ring and a second end of the second ring; wherein the first split and the second split provide the leak path for passage of fluid between the ends of the first ring and the second ring; wherein the first split between the ends of the first ring is circumferentially staggered out of alignment with the second split between the ends of the second ring; and wherein a rotational position of the first ring relative to the second ring is maintained within the recess.